Paediatric dentistry- novel evolvement.

Pediatric dentistry provides primary and comprehensive preventive and therapeutic oral health care for infants and children through adolescence, together with special health care needs. This specialty encompasses a variety of skills, disciplines, procedures and techniques that share a common origin with other dental specialties however these have been modified and reformed to the distinctive requirements of infants, children, adolescents and special health care needs. Disciplines comprise of behavior guidance, care of the medically and developmentally compromised and disabled patient, supervision of orofacial growth and development, caries prevention, sedation, pharmacological management, and hospital dentistry including other traditional fields of dentistry. The skills apply to the ever-changing stages of dental, physical, and psychosocial development for treating conditions and diseases distinctive to growing individuals. Hence with the changing scope of practice it is imperative that the clinician stays updated with the current evidence based trends in practice, collaborates with other disciplines and Imparts quality oral health care tailored to the specific needs of every child.

Pediatric dentistry provides primary and comprehensive preventive and therapeutic oral health care for infants and children through adolescence including special health care needs [1]. It assimilates a variety of skills, disciplines, procedures and techniques which have been modified and reformed to the unique requirements of infants, children, adolescents and special health care needs [2]. The disciplines comprise of behavior guidance, care for the medically and developmentally compromised and disabled patient, supervision of orofacial growth and development, caries prevention, sedation, pharmacological management and hospital dentistry including other traditional fields of dentistry. The skills for treating conditions and diseases distinctive to growing individuals apply to the altering stages of dental, physical, and psychosocial development [2] (see Fig. 1).

Fig. 1

Influence on children's oral health status. From Fisher-Owen SA, Gansky SA, Platt LJ, Weintraub JA, Soobader M-J, Bramlett MD, Newacheck PW. Influences on children's oral health: a conceptual model. Pediatrics 2007; 120: e510-e520.

Oral health is a fundamental part of the overall health and welfare of every infant, child and adolescent because oral diseases affect function, development and quality of life. Child oral health care should be safe, continual, wide-ranging, easily accessible, cost effective, good in quality and reverent of every child and their family [3]. This care precludes and eradicates disease, pain and infection; restores function and form of dentitions and corrects apparent facial dysfunction or disfiguration [4].

The practice of dentistry experiences a new paradigm shift with the advent and use of new technology. New imaging devices, restorative procedures, internet and powerful electronic devices, laser dentistry and new materials are examples of advances impacting dentistry. Although pediatric dentistry may not have as many new tools of treatments their practices have nevertheless improved tremendously in the recent years.

This review is an overview of the evidence based current practices and advances in pediatric dentistry advances and guides the provision of primary prevention, early intervention and reparative care in the primary and permanent dentition.

Dental home

A dental home is a continuing relationship between a dentist and a patient encompassing all aspects of oral health care delivery [5]. It considers the patient's age, developmental and psychosocial status with the aim of health promotion, disease prevention and anticipatory guidance in a comprehensive, accessible and family-centered way [5]. This service may be attained via provider training, prevention emphasis and alliance among stakeholders [6]. It should be set up by 6 months of age and no later than 12 months of age [7].

Emergent evidence shows the effectiveness of early founding of a dental home in reducing early childhood caries [8]. A dentist in a dentist-directed care examines, diagnoses oral conditions and tailors a treatment plan including preventive services and all services are carried out under the dentist's supervision alongside allied dental personnel. Affiliating with other health providers like pediatricians, pediatric nurses, family physicians who most often see children during the first years of life improves the oral health of a child [9].

Prophylaxis

Dental plaque, stains and calculus are removed by the dentists and hygienists via several approaches. In a toothbrush prophylaxis; toothbrush and toothpaste remove plaque from all the surfaces [10]. In a rubber cup prophylaxis; a dental polishing paste is applied to tooth surfaces by a rotary rubber cup or rotary bristle brushes for eliminating dental plaque and stains [11]. In dental scaling an ultrasonic or hand instrument is used for removal of dental calculus and stains [12].

Professional prophylaxis is beneficial for introducing dental procedures to the young child and apprehensive patient, assessing patient cooperation, facilitating hard and soft tissue examination, instructing the caregiver and child or adolescent in pro-per oral hygiene techniques and removal of plaque, calculus and extrinsic stains. Caries/periodontal disease are the determinants of recall interval [12].

Fluoride

Fluoride favors caries risk reduction and reversal of enamel demineralization in a safe and effective manner [13]. Topical cariostatic effect [14] may be better when supplemented with good oral hygiene practices like complete tooth brushing with a fluoride toothpaste [15]. Adjusting fluoride level in community water supply to an optimal concentration reduces caries occurrence [16]. Currently recommended fluoride level in community water supply is 0.7 ppm [17].

The anti-caries effect of professional topical fluoride treatments is exhibited by various measures including 1.23% acidulated phosphate fluoride, 5% neutral sodium fluoride varnish, 0.09% fluoride mouthrinse and 0.5% fluoride gel/paste [18]. The content of fluoride in ready-to-use infant formulas in the U.S. and Canada ranges from 0.1 to 0.3 mg/L [19]. Fluoridated milk and fluoridated salt could be considered for high caries prevalence and low compliance for tooth brushing in areas without water fluoridation.

Fluoride tablets (0.25 mg NaF) and fluoride drops may be recommended for children at high risk of caries on an individual basis. Topical fluorides (gels, varnishes, and rinses) should be used in children at an increased caries risk and for children with special oral health care needs [20]. Gels for professional use contain 5000–12,500 ppm F [21]. Rinses for home use or at schools on a daily basis contain 0.05% NaF (225 ppm F); and weekly basis contain 0.2% NaF (900 ppm F) [21]. Varnishes for professional use contain 1000–56,300 ppm Fluoride [21].

The duration of tooth brushing should surpass one minute on each brushing, excess toothpaste spat out and water rinses avoided. Teeth may be brushed with either manual or powered toothbrushes with a soft small head. The recommended fluoride concentration for toothpaste in children 6 months- <2 years is 500 ppm, twice a day and as a pea sized amount. For children 2-<6 years of age use a1000 (+) ppm toothpaste twice a day as a pea-sized amount. For 6 years and over 1450 ppm use twice daily ranging between 1-2 cm [22].

Interim therapeutic restoration

ITR is performed when traditional cavity preparation and/or placement of dental restorations are not possible or when caries control is necessary prior to a definitive dental restoration [23]. The tooth is prepared by removing caries without pulpal exposure by hand or rotary instruments and restored with an adhesive restorative material like glass ionomer or resin-modified glass ionomer cement [24]. Highest success is achieved on applying to single surface or small two surface restorations [25]. Inadequate cavity preparation with subsequent lack of retention and insufficient bulk can lead to failure [26,27]. Leakage of a restoration can be minimized by maximum caries removal from the margin of the lesion.

Oral hygiene instructions and follow-up care with topical fluorides may improve the treatment outcome in high caries-risk populations, particularly when glass ionomer cements with fluoride releasing and recharging properties are used [28]. ITR reduces levels of cariogenic oral bacteria (e.g., Mutans Streptococci, lactobacilli) instantly after it is placed. This level however may return to pre-procedure counts six months after ITR placement if another treatment is not delivered [29].

Bleaching

Internal or external dental whitening for individual teeth of primary and young permanent teeth are indicated for discoloration secondary to a traumatic injury (darkening with devitalization, calcific metamorphosis), anomalies in enamel color of a permanent tooth due to trauma or infection of the primary tooth or intrinsic discoloration/staining (tetracycline staining, fluorosis) [[30], [31], [32], [33], [34], [35]].

This may be accomplished by in-office professional whitening or at-home bleaching modalities (custom trays or over-the-counter products including bleaching gels, whitening strips, brush-on agents, toothpaste, mints, chewing gum, and mouth rinse). Whiteners or bleaching agents (professional-use products) containing peroxide range from 10% carbamide peroxide (3% hydrogen peroxide) to 38% (13 percent hydrogen peroxide). Carbamide peroxide is the most common active ingredient in dentist-dispensed tooth-bleaching products for home-use [36].

In-office bleaching products require rubber dam or a protective gel isolation to protect the gingival soft tissues. Home-use bleaching products contain lower concentrations of hydrogen peroxide or carbamide peroxide [37]. Whitening toothpastes contain polishing or chemical agents which remove extrinsic stains from the tooth surface through gentle polishing, chemically chelating or other non-bleaching action [38].

The side effects from vital tooth bleaching include sensitivity; tissue irritation and increased marginal leakage of an existing restoration [37] whereas internal bleaching of non-vital teeth exhibits external root resorption [39] and ankylosis. Degradation byproducts of hydrogen peroxide or carbamide peroxide result in a hydroxyl-free radicals associated with periodontal tissue damage and root resorption. Hence minimizing the exposure at the lowest effective concentration of hydrogen peroxide or carbamide peroxide is recommended beside sodium perborate mixed with water for bleaching nonvital teeth [40,41].

Lasers

Laser is an abbreviation for light amplification by stimulated emission of radiation. An active medium produces photons of energy on stimulation which is transported in a beam with a precise wavelength exclusive to that medium. Lasers are classified by the active medium used for creating the energy. They are a single wavelength and monochromatic since the energy radiated is only by one color [42]. Target or identified oral hard and soft tissues differ in their affinity for absorption of specific wavelengths of laser energy [43].

The main effect of a laser inside the target tissues is photothermal [44]. When the target tissue containing water is raised above 100 degrees centigrade, the water vaporizes leading to soft tissue ablation [45]. Hard dental tissues with minerals and hydroxyapatite crystals donot ablate at this temperature but the steam expands and disperses the material into small particles [43]. They provide dental restorative and soft tissue procedures for infants, children, and adolescents as well as those with special health care needs.

The CO2 is a soft tissue laser is effective in incising, excising, and coagulating soft tissue [45]. The diode laser encompasses a solid active medium and semiconductor crystals of aluminum or iridium, gallium, and arsenic is readily absorbed by pigmented tissues [46]. The Nd:YAG laser containing neodymium ions and crystal of yttrium, aluminum, and garnet [47] is effective in coagulation and hemostasis in soft tissue procedures since it is absorbed by pigmented tissues, minimally by hard tissue as well as by hemoglobin [48]. The Er:YAG comprises of erbium ions and a solid active medium of crystals of yttrium, aluminum, and garnet and the Er,Cr:YSGG encompasses erbium, chromium ions, and a crystal of yttrium, scandium, gallium, and garnet. It facilitates soft tissue procedures, removes caries and prepares enamel, dentin, cementum, and bone [49].

Lasers benefit pediatric dentistry on the basis of discerning and specific interface with diseased tissues [45]. They produce less thermal necrosis of adjacent tissues than electrosurgical instruments [48] obtain hemostasis during soft tissue procedures without sutures in most cases [50] exhibit rapid wound healing with less post-operative discomfort and reduce the need for analgesics [51]; less to no local anesthesia [51] and reduce operator chair time. The property of decontaminating and bactericidal action on tissues entails less antibiotic prescription post-operatively [45,51]. Relief from pain and inflammation concomitant with aphthous ulcers and herpetic lesions without pharmacological intervention is also apparent [50,51].

The erbium lasers performs minimal caries removal because affected carious tissue has a higher water content than the healthy dental tissue [52] and eliminate the vibratory effects of the conventional high-speed hand pieces rendering tooth preparations comfortable and less anxiety provoking for children and adolescents [53]. Analgesic effect of Nd:YAG and erbium lasers on hard tissues eliminate the need of local anesthesia during tooth preparations [54,55].

Pain management

Pain is difficult to measure in children due to its subjectivity and often reliant on parents [56].

Children experience pain and exhibit variability in the expression of pain due to the differences in their cognitive and emotional development, medical conditions. Pain scale indicators used with children include the FACES pain scale and the Wong-Baker FACES scale [57]. Pain assessment in special needs children needs observations such as vocalization, facial expressions and body movements [58].

Pain in a dental setup can be effectively managed and relieved by both non pharmacologic and pharmacological pain strategies pre-operatively. Non-pharmacologic behavior therapy includes guided imagery, distraction, play therapy and tell-show-do techniques. Pharmacologic therapy may consist of a hierarchy in terms of adequate local anesthesia, anxiolysis, moderate sedation, or deep sedation regimens [59].

Inadequate pain management may have significant physical and psychological consequences hence it is imperative to recognize and assess pain and document it in the patient's chart to determine a clinical diagnosis, plan a treatment and determine the analgesic requirement for the patient. Familiarity with the medical history aids to avoid prescription of a contraindicated drug and comprehend the consequences, morbidities and toxicities associated with the use of specific therapeutics. Selection of an analgesic depends on the individual patient, the extent of treatment, the duration of the procedure, psychological factors, patient's medical history and physiologic factors such as bleeding disorders, liver problems, or kidney problems [60].

Analgesics should initially be administered on a regular time schedule if moderate to severe pain is considered likely during the first 36 to 48 h and not as needed so as to create stable plasma levels of analgesics and decrease the chance of breakthrough pain [61,62]. Consider non-opioid analgesics [eg, nonsteroidal anti-inflammatory agents (NSAIDs), acetaminophen] as first line agents for acute mild to post-operative pain management. Combining NSAIDs with acetaminophen provides a greater analgesic effect than a single agent alone. Opioid analgesics (Codeine) combined with NSAIDs for treatment of moderate to severe post-operative pain in children and adolescents [63].

Antibiotic prophylaxis

Bacteremia, bacteria in the bloodstream, is anticipated following invasive dental procedures. Infective endocarditis is an uncommon but life-threatening complication resulting from bacteremia. Viridans group streptococci, Staphylococcus aureus, enterococcus, pseudomonas, serratia, and candida are some of the microorganisms implicated with IE. Many cases of IE caused by oral microflora can result from bacteremia associated with routine daily activities such as toothbrushing, flossing and chewing. However, antibiotic prophylaxis is recommended with certain dental procedures. An effective antibiotic regimen should be directed against the most likely infecting organism, with antibiotics administered shortly before the procedure. Antibiotics are recommended for cardiac patients at high risk (cardiac valve repair, congenital heart disease, cardiac transplantation with cardiac valvulopathy and previous endocarditis, immunocompromised patients (immunosuppression secondary to HIV, Severe Combined Immunodeficiency syndrome, cancer chemotherapy, hematopoietic stem cell therapy or organ transplant), head and neck cancer, Autoimmune disease, Sickle cell anemia, diabetes, chronic steroid and bisphosphonate therapy or asplenism. It is also prescribed for patients with prosthetic total joint arthroplasty where hematogenous infections may lead to loss of prosthetic joint [[64], [65], [66], [67], [68], [69], [70]].

Analgesis/anxiolysis

Analgesia/anxiolysis is the diminution or elimination of pain and anxiety in a conscious patient [72]. The patient is responsive to verbal commands, every vital sign is stable with no significant risk of loss of protective reflexes and with a safe return to pre-procedural mobility. Analgesia/anxiolysis may accelerate the delivery of procedures not particularly uncomfortable but which require the patient to minimize movement [71,73].

Nitrous oxide is a colorless and virtually odorless gas with a faint, sweet smell. This effective analgesic/anxiolytic agent causes central nervous system (CNS) depression and euphoria with a very slight effect on the respiratory system [73,74]. Nitrous oxide has several mechanisms of action. The analgesic effect is initiated by neuronal release of endogeneous opioid peptides with subsequent activation of opioid receptors and descending Gamma-aminobutyric acid type A (GABAA) receptors and noradrenergic pathways modulating nociceptive processing at the spinal level. The anxiolytic effect involves activation of the GABAA receptor either directly or indirectly through the benzodiazepine binding site [75,76]. Since nitrous oxide is 34 times more soluble than nitrogen in blood, diffusion hypoxia may occur. Nitrous oxide causes minor depression in cardiac output while peripheral resistance is slightly increased, hence maintaining the blood pressure [73].

Nitrous oxide inhalation/sedation is a predictable pharmacological approach for reducing or alleviating anxiety, discomfort or pain, enhances patient communication and cooperation, raises the pain threshold, increases tolerance for longer appointments, reduces gagging, potentiates sedative effect and aids the treatment of special needs children. The disadvantages include lack of potency, dependence on psychological reassurance and interference of the nasal hood to anterior maxilla, nitrous oxide pollution and occupational hazard. Contraindications include chronic obstructive pulmonary disease, emotional disturbance, coblamin deficiency, treatment with bleomycin sulphate, methylenetetrahydrofolate reductase deficiency and the first trimester of pregnancy [[74], [75], [76]].

Selection of an appropriately sized nasal hood is important. A flow rate of five to six L/min generally is acceptable to most patients and can be adjusted after observation of the reservoir bag. The bag should pulsate gently with each breath and should not be either over- or underinflated. Introduction of 100 percent oxygen for one to two minutes followed by titration of nitrous oxide in 10 percent intervals is recommended. During nitrous oxide/oxygen analgesia/anxiolysis the concentration of nitrous oxide should not routinely exceed 50 percent. Studies have demonstrated that gas concentrations dispensed by the flow meter vary significantly from the end expired alveolar gas concentrations; it is the latter that is responsible for the clinical effects [75,76]. To achieve sedation, the scavenging vacuum should not be so strong as to prevent adequate ventilation of the lungs with nitrous oxide [77]. A review of records of patients undergoing nitrous oxide-oxygen inhalation sedation demonstrate that the typical patient requires from 30 to 40 percent nitrous oxide to achieve ideal sedation [31]. Nitrous oxide concentration may be decreased during easier procedures (eg, restorations) and increased during more stimulating ones (eg, extraction, injection of local anesthetic).

Side effects such as nausea and vomiting are more likely to be observed when titration is not employed [31]. During treatment, it is important to continue the visual monitoring of the patient's respiratory rate and level of consciousness. The effects of nitrous oxide largely are dependent on psychological reassurance. It is therefore important to continue traditional behavior guidance techniques during treatment. Once the nitrous oxide flow is terminated, 100 percent oxygen should be delivered for five minutes. The patient must return to pretreatment responsiveness before discharge.

Facilities for delivering nitrous oxide/oxygen must be checked for proper gas delivery and fail-safe function checked and calibrated prior to use. Inhalation equipment must have the capacity for delivering 100 percent and never less than 30 percent, oxygen concentration at a flow rate appropriate to the child's size, appropriate scavenging and delivery system to minimize room air contamination and occupational risk should have BLS training and an emergency cart should be available. A positive pressure oxygen delivery system capable of administering greater than 90 percent oxygen at a 10 L/min flow for at least 60 min (650 L, “E” cylinder) must be available. When a self-inflating bag valve mask device is used for delivering positive pressure oxygen, a 15 L/min flow is recommended [[78], [79], [80], [81], [82], [83], [84], [85]].

Restorative techniques

A multitude of restorative treatment decisions are available for primary and permanent dentition. These include dental amalgam, glass ionomers, resin modified glass ionomers, conventional glass ionomers, atraumatic/alternative restorative technique (ART), interim therapeutic restoration (ITR), resin infiltration, dental composites, pit and fissure sealants, resin-based sealants, glass ionomer sealants, resin based composite, dental composites, compomers, stainless steel crowns, primary molar, preformed metal crown, strip crowns, pre-veneered crowns and esthetic restorations [86].

The contemporary management of dental caries encompasses identification of an individual risk for caries progression, understanding of the disease process and active surveillance to assess disease progression and manage with appropriate preventive services, supplemented by the most adequate restorative therapy when indicated [87]. Decisions for when to restore carious lesions include clinical criteria of visual detection of enamel cavitation, visual identification of shadowing of the enamel, and/or radiographic recognition of enlargement of lesions over time [88].

The benefits of restorative therapy include removal of cavitation or defects to eliminate areas that are susceptible to caries; stopping the progression of tooth demineralization; restoring the integrity of tooth structure; preventing the spread of infection into the dental pulp; and preventing the shifting of teeth and space loss due to loss of tooth structure. The risks of restorative therapy include lessening the longevity of teeth by making them more susceptible to fracture, recurrent lesions, restoration failure, pulp exposure during caries excavation, future pulpal complications, and iatrogenic damage to adjacent teeth [[89], [90], [91]]. Primary teeth may be more susceptible to restoration failures than permanent teeth [92]. In addition before restoring primary teeth, one needs to consider the time of primary tooth exfoliation.

Stepwise excavation is a two-step caries removal process in which carious dentin is partially removed at the first appointment, leaving caries over the pulp, with placement of a temporary filling. At the second appointment, all remaining carious dentin is removed and a final restoration placed [93]. Partial, or one-step, caries excavation removes part of the carious dentin, but leaves caries over the pulp and subsequently places a base and final restoration [94,95]. No removal of caries before restoration of primary molars in children aged three to 10 years also has been reported [96]. This preserves the tooth structure and pulp vitality.

Pit and fissure sealant are a material placed into the pits and fissures of caries-susceptible teeth that micromechanically bonds to the tooth preventing access by cariogenic bacteria to their source of nutrients [97] thus reduce caries risk in susceptible sites especially primary molars by lowering the number of viable bacteria including streptococcus mutans and lactobacilli [98].

Resin infiltration is an innovative approach primarily to arrest the progression of non-cavitated interproximal caries lesions. The aim of the resin infiltration technique is to allow penetration of a low viscosity resin into the porous lesion body of enamel caries [98]. An additional use of resin infiltration has been suggested to restore white spot lesions formed during orthodontic treatment [99].

Dental amalgam has been the most commonly used restorative material in posterior teeth for over 150 years and is still widely used throughout the world today [100]. Amalgam contains a mixture of metals such as silver, copper, and tin, in addition to approximately 50 percent mercury [101]. Dental amalgam has declined in use over the past decade, perhaps due to the controversy surrounding perceived health effects of mercury vapor, environmental concerns from its mercury content, and increased demand for esthetic alternatives. There is strong evidence that dental amalgam is efficacious in the restoration of Class I and Class II cavity restorations in primary and permanent teeth [100,101].

Composites consist of a resin matrix and chemically bonded fillers [102]. They are classified according to their filler size, because filler size affects polishability/esthetics, polymerization depth, polymerization shrinkage and physical properties. Hybrid resins combine a mixture of particle sizes for improved strength while retaining esthetics [103]. The smaller filler particle size allows greater polishability and esthetics, while larger size provides strength. Flowable resins have a lower volumetric filler percentage than hybrid resins [104]. Enamel and dentin bonding agents decrease marginal staining and detectable margins for the different types of composites. In primary molars, there is strong evidence from randomized controlled trials that composite resins are successful when used in Class I restorations and Class II lesions in primary teeth.

Advancements in conventional glass ionomer formulation led to better properties, including the formation of resin-modified glass ionomers. These products showed improvement in handling characteristics, decreased setting time, increased strength and improved wear resistance. The properties that make GIC favorable for use in children include: chemical bond to both enamel and dentin; thermal expansion similar to that of tooth structure; biocompatibility; uptake and release of fluoride and decreased moisture sensitivity as compared to resins. Resin modified glass ionomer cements (RMGIC), with the acid-base polymerization supplemented by a second resin light cure polymerization is efficacious in primary teeth [105,106].

GIC is recommended in class 1 restorations and class II restorations in primary teeth. Other applications of glass ionomers where fluoride release has advantages are for interim therapeutic restorations (ITR) and the atraumatic/alternative restorative technique (ART). These procedures have similar techniques but different therapeutic goals. ITR may be used in a very young [107] uncooperative or special health care needs [108] for whom traditional cavity preparation and/or placement of traditional dental restorations are not feasible or need to be postponed. Additionally, ITR may be used for caries control in children with multiple open carious lesions, prior to definitive restoration of the teeth [[109], [110], [111]].

Compomers Polyacid-modified resin-based composites or compomers; contain 72 percent (by weight) strontium fluorosilicate glass and the average particle size is 2.5 micrometers. Moisture is attracted to both acid functional monomer and basic ionomer-type in the material. This moisture triggers a reaction that releases fluoride and buffers acidic environments. Considering the ability to release fluoride, esthetic value and simple handling properties of compomer, it can be useful in pediatric dentistry. Compomers can be an alternative to other restorative materials in the primary dentition in Class I and Class II restorations [112,113].

Preformed metal crowns (also known as stainless steel crowns) are prefabricated metal crown forms which adapt to individual teeth and cement with a biocompatible luting agent. They are indicated for the restoring primary and permanent teeth with extensive caries, cervical decalcification, and/or developmental defects (eg, hypoplasia, hypocalcification), when other available restorative materials are likely to fail (eg, interproximal caries extending beyond line angles, patients with bruxism), following pulpotomy or pulpectomy, as fixing abutments for space maintainers, the intermediate restoration of fractured teeth, definitive restorative treatment for high caries-risk children and in patients whose treatment is performed under sedation or general anesthesia [113].

Anterior esthetic restorations are a challenge due to: the small size of the teeth; close proximity of the pulp to the tooth surface; relatively thin enamel; lack of surface area for bonding and child behavior. Treatment options for primary anterior teeth include composites for Class III and Class V restorations and permanent dentition as well as resin modified GIC, strip crowns, pre-veneered stainless steel crowns, preformed stainless steel crowns and open-faced stainless steel crowns for full coverage restorations [114].

Pulp therapy

In pulp therapy the primary objective is to maintain the integrity and health of the tooth and supporting tissues whereas the treatment objective is to maintain the vitality of the pulp of a tooth affected by caries, traumatic injury or other causes. Pulp preservation in young primary teeth allows apexogenesis for long term retention of a tooth with a favorable crown root ratio and thick dentinal walls [115].

The indications, objectives, and type of pulpal therapy depend on the pulpal status subject to whether the pulp is vital or non-vital. This is based on the clinical and radiographic diagnosis of normal pulp (symptom free and normally responsive to vitality testing), reversible pulpitis (pulp is capable of healing), symptomatic or asymptomatic irreversible pulpitis (vital inflamed pulp is incapable of healing) or pulp necrosis [116]. Clinical tests which help include palpation, percussion, and mobility and for permanent teeth, electric pulp tests and thermal test are recommended [117,118].

Vital pulp therapy for primary teeth with a diagnosis of a normal pulp or reversible pulpitis entails a protective liner. A protective liner is a liquid applied thinly on the pulpal surface of a deep cavity preparation for providing coverage to the exposed dentin tubules and to serve as a protective barrier between the restorative material or cement and the pulp. Calcium hydroxide, dentin bonding agent and glass ionomer cements liners are usually placed [119,120].

Indirect pulp treatment is instituted in a tooth with a deep carious lesion approximating the pulp but without signs or symptoms of pulp degeneration [115]. Caries encircling the pulp is left behind to avoid pulpal exposure and is subsequently covered with a biocompatible material [121]. A radiopaque liner such as a dentin bonding agent [122], resin modified glass ionomer [123,124], calcium hydroxide [125,126], zinc oxide/eugenol [127], or glass ionomer cement [128,129] are applied over the remaining carious dentin for stimulation of healing and repair.

Direct pulp capping is indicated for a permanent tooth that has a small carious or mechanical exposure in a tooth with a normal pulp [130]. Calcium hydroxide or MTA is placed prior to the definitive restoration [131,132].

Partial pulpotomy for carious exposures involves the removal of inflamed pulp tissue beneath an exposure 1–3 millimeters or deeper to reach healthy pulp tissue and the surrounding dentine. Pulpal bleeding is controlled by irrigation with a bacteriocidal agent such as sodium hypochlorite or chlorhexidineb [133,134] within a few minutes after which the site is covered with calcium hydroxide [[135], [136], [137]] or MTA. Refs. [138,139] followed by resin modified glass ionomer cement [140].

Partial pulpotomy for traumatic exposures (Cvek pulpotomy). Is indicated for a vital, traumatically exposed, young permanent tooth ln which the inflamed pulp tissue beneath an exposure is removed to a depth of one to three millimeters or more to reach the deeper healthy tissue. Pulpal bleeding is controlled via bacteriocidal irrigants such as sodium hypochlorite or chlorhexidine [141], and the site then is covered with calcium hydroxide [142,143], or MTA [144].White, rather than gray, MTA is recommended in anterior teeth to decrease the chance of discoloration. It is independent of the time between treatment and the accident and the size of exposure.

Nonvital pulp treatment Pulpectomy (conventional root canal treatment). In apexified permanent teeth is conventional root canal (endodontic) treatment for exposed, infected, and/or necrotic teeth to eliminate pulpal and periradicular infection. The roof of the pulp chamber is cleared to gain access to the canals and remove all coronal pulp tissue. Following debridement, the canals are disinfected, shaped and obturated in entirety with a biologically-acceptable, nonresorbable filling as close to the cementoenamel junction as possible [145].

Apexification (root end closure) is indicated for inducing root end closure in an incompletely formed permanent non-vital tooth by removal of the coronal andl radicular tissue and placing a biocompatible agent such as calcium hydroxide in the canals for two to four weeks to disinfect. Root end closure is accomplished with an apical barrier such as MTA [146] and conformed by clinical and radiographic diagnosis. If complete closure cannot be accomplished by MTA, an absorbable collagen wound dressing (eg, Colla-Cote®) [147]can be placed at the root end and MTA packed subsequently in the canal space. Gutta percha fill the remaining canal space. If the walls of the canal are thin, fill with MTA or composite resin instead of gutta percha to protect from tooth fracture [148].

Stem cells

Pulpalal tissue of exfoliating primary teeth and surgically removed third molars may be a source of mesenchymal stem cells [149]. While sources of dental stem cells are readily accessible, those cells must be attained with consent, secured and stored properly to maintain the potential to proliferate and differentiate [150] for autologous regenerative therapies.

Radiographs

They aid diagnosis of disease and dentofacial development in oral health of children across all age groups. Good radiological practices (eg, use of lead apron, thyroid collars, and high-speed film; beam collimation) are important. The benefits of obtaining radiographs against the patient's risk of radiation exposure must be weighed. New imaging technologies [ie, cone beam computed tomography (CBCT)] have added three-dimensional capabilities to the practice. Posterior bitewings, periapical xrays, panoramic exam, Occlusal x rays are tailored to the caries risk and type of clinical presentation [151].

Pulpotomy and pulpal medicaments

The pulpotomy procedure is performed in a primary tooth with extensive caries when removal results in pulpal exposure but without evidence of radicular pathology or pulp exposure due to mechanical trauma. The coronal pulp tissue is amputated, and the remaining vital radicular pulp tissue surface judged to be vital without suppuration, purulence, necrosis or excessive haemorrhage uncontrolled after few minutes is treated with a long-term clinically-successful medicament such as Buckley's Solution of formocresol or ferric sulfate [[152], [153], [154], [155]]. Calcium hydroxide has less long term success [156]. MTA is a recent pulpotomy medicament with a high rate of success. Clinical trials show that MTA performs equal to or better than formocresol or ferric sulfate [157,158] and may be the preferred pulpotomy agent in the future.

Electrosurgery is another method which demonstrates success [159]. After filling the coronal pulp chamber with zinc/oxide eugenol or other suitable base, the tooth is restored with a restoration that seals the tooth and prevents microleakage. Stainless steel crown is the most long term restoration but if sufficient supporting enamel remains, amalgam or composite resin may offer functional alternative given that the primary tooth has a life span of two years or less [[160], [161], [162]].

Hence with the changing scope of practice it is imperative that the clinician stays updated with the current evidence based trends in practice, collaborates with other disciplines and Imparts quality oral health care tailored to the specific needs of every child.

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