Elnaz Shafigh1, Reza Fekrazad2,3, Amir Reza Beglou4. 1. Operative Dentistry Department, Faculty of Dentistry, AJA University of Medical Sciences, Tehran, Iran. 2. Department of Periodontology, Dental Faculty - Laser Research Centre in Medical Sciences, AJA University of Medical Sciences. 3. International Network for Photo Medicine and Photo Dynamic Therapy (INPMPDT), Universal Scientific Education and Research Network (USERN), Tehran, Iran. 4. Corresponding author: Department of Operative Dentistry, AJA University of Medical Science, Daneshjou Boulevard, Evin, Tehran, Iran, PO 19839, amir.beglou@gmail.com.
Abstract
BACKGROUND: Pressure changes can influence dental restorations especially among divers. The aim of the current study was to evaluate the fracture resistance and microleakage of mesio-occluso-distal (MOD) amalgam and composite restorations undergoing pressure changes via diving and aviation simulation. METHODS: For the fracture resistance test, 60 sound maxillary premolar teeth were randomly allocated to two groups. Each group was then divided into three subgroups (n = 10) for simulating scuba-diving (pressure cycle to 203 kPa, 2 bar), flight (50.6 kPa, 0.5 bar), and control (atmospheric pressure). The teeth underwent pressure cycles for one month and then the fracture resistance test was conducted on them using the Instron testing machine. Microleakage scores were afterwards recorded by using a 2% methylene blue dye for 24 hours. RESULTS: Composite restorations showed significantly higher fracture resistance values compared to the amalgam group (P < 0.05). The control group had significantly higher fracture resistance values compared to the dive group, whereas there was no significant difference between the control group and the flight group (P = 0.083). No significant difference in the level of microleakage was observed between restoration materials or pressure cycles (P > 0.05). CONCLUSIONS: Composite restorations showed better fracture resistance compared to the amalgam group. However, diving pressure cycles demonstrated adverse effects on the fracture resistance values of both restorative materials. Copyright: This article is the copyright of the authors who grant Diving and Hyperbaric Medicine a non-exclusive licence to publish the article in electronic and other forms.
RCT Entities:
BACKGROUND: Pressure changes can influence dental restorations especially among divers. The aim of the current study was to evaluate the fracture resistance and microleakage of mesio-occluso-distal (MOD) amalgam and composite restorations undergoing pressure changes via diving and aviation simulation. METHODS: For the fracture resistance test, 60 sound maxillary premolar teeth were randomly allocated to two groups. Each group was then divided into three subgroups (n = 10) for simulating scuba-diving (pressure cycle to 203 kPa, 2 bar), flight (50.6 kPa, 0.5 bar), and control (atmospheric pressure). The teeth underwent pressure cycles for one month and then the fracture resistance test was conducted on them using the Instron testing machine. Microleakage scores were afterwards recorded by using a 2% methylene blue dye for 24 hours. RESULTS: Composite restorations showed significantly higher fracture resistance values compared to the amalgam group (P < 0.05). The control group had significantly higher fracture resistance values compared to the dive group, whereas there was no significant difference between the control group and the flight group (P = 0.083). No significant difference in the level of microleakage was observed between restoration materials or pressure cycles (P > 0.05). CONCLUSIONS: Composite restorations showed better fracture resistance compared to the amalgam group. However, diving pressure cycles demonstrated adverse effects on the fracture resistance values of both restorative materials. Copyright: This article is the copyright of the authors who grant Diving and Hyperbaric Medicine a non-exclusive licence to publish the article in electronic and other forms.