Sahand Samieirad1, Majid Eshghpour2, Ramina Dashti3, Elahe Tohidi4, Abdollah Rashid Javan5, Vajiheh Mianbandi6. 1. Assistant Professor, Oral and Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. 2. Associate Professor, Oral and Maxillofacial Surgery Department, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran. 3. Dentist, Student Research Committee, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran. 4. Oral and Maxillofacial Radiologist, Dental Research Center, Mashhad University of Medical sciences, Mashhad, Iran. 5. Master of Biostatistics, Dental School, Mashhad University of Medical Sciences, Mashhad, Iran. 6. Dentist, Student Research Committee, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran. Electronic address: vajihem194@gmail.com.
Abstract
PURPOSE: The purpose of this study was to investigate and determine the relations between mandibular third molar (M3) impaction types and mandibular angle and condylar fractures. MATERIALS AND METHODS: A retrospective study was conducted in patients with mandibular angle and condylar fractures referred to the Oral and Maxillofacial Surgery Department of the Shahid Kamyab Hospital (Mashhad, Iran) from 2013 to 2018. Data sources were patients' hospital documents and panoramic radiographs. Predictor variables were the presence and position of impacted M3s. The Pell-Gregory classification was used to identify the horizontal and vertical positions of impaction. The impaction angulation was determined using the Schiller classification. Outcome variables were the presence of angle and condylar fractures. Data were analyzed using SPSS 16 (IBM Corp, Armonk, NY) and χ2 and Fisher exact tests. RESULTS: The study sample consisted of 117 patients (63.2% with condylar fractures, 30.8% with angle fractures, and 6% with concomitant fractures of the condyle and angle). Most patients (88.9%) with angle fracture had impacted M3s; however, impacted M3s were absent in 59.5% of condylar fracture cases. Mesioangular and vertical positions were the most prevalent impaction angulation types in patients with mandibular angle fracture. Classes II and B were the most frequent horizontal and vertical impaction types, respectively, according to the Pell-Gregory classification. There was a statistically significant difference between fracture site and the presence or absence of impacted M3s (P < .001). Moreover, a significant relation was observed between horizontal impaction type and fracture site in patients with impacted M3s (P = .001). CONCLUSIONS: The presence of impacted M3s increased the risk of angle fractures and simultaneously decreased the risk of condylar fractures. Fractures of the angle region were more commonly seen in patients with superficially impacted (vs deeply impacted) M3s.
PURPOSE: The purpose of this study was to investigate and determine the relations between mandibular third molar (M3) impaction types and mandibular angle and condylar fractures. MATERIALS AND METHODS: A retrospective study was conducted in patients with mandibular angle and condylar fractures referred to the Oral and Maxillofacial Surgery Department of the Shahid Kamyab Hospital (Mashhad, Iran) from 2013 to 2018. Data sources were patients' hospital documents and panoramic radiographs. Predictor variables were the presence and position of impacted M3s. The Pell-Gregory classification was used to identify the horizontal and vertical positions of impaction. The impaction angulation was determined using the Schiller classification. Outcome variables were the presence of angle and condylar fractures. Data were analyzed using SPSS 16 (IBM Corp, Armonk, NY) and χ2 and Fisher exact tests. RESULTS: The study sample consisted of 117 patients (63.2% with condylar fractures, 30.8% with angle fractures, and 6% with concomitant fractures of the condyle and angle). Most patients (88.9%) with angle fracture had impacted M3s; however, impacted M3s were absent in 59.5% of condylar fracture cases. Mesioangular and vertical positions were the most prevalent impaction angulation types in patients with mandibular angle fracture. Classes II and B were the most frequent horizontal and vertical impaction types, respectively, according to the Pell-Gregory classification. There was a statistically significant difference between fracture site and the presence or absence of impacted M3s (P < .001). Moreover, a significant relation was observed between horizontal impaction type and fracture site in patients with impacted M3s (P = .001). CONCLUSIONS: The presence of impacted M3s increased the risk of angle fractures and simultaneously decreased the risk of condylar fractures. Fractures of the angle region were more commonly seen in patients with superficially impacted (vs deeply impacted) M3s.