title: A multi-centre retrospective study of mandibular fractures: do occlusal support and the mandibular third molar affect mandibular angle and condylar fractures?
abstract: This retrospective study was performed to investigate the influence of occlusal support and the presence, state, and position of mandibular third molars on the incidence of mandibular angle and condylar fractures. The following variables were investigated: age, sex, cause of fracture, presence and state (impaction, angulation, and the number of roots) of the mandibular third molars, site of the mandibular fracture, presence of occlusal support, duration of intermaxillary fixation, and postoperative complications. Various risk factors for mandibular angle and condylar fractures were investigated by univariate analysis. The risk of mandibular angle fracture was significantly higher in patients with occlusal support and mandibular third molars. The risk of condylar fracture was significantly higher in patients without occlusal support or mandibular third molars. The position and angulation of the mandibular third molars were not significant risk factors in mandibular angle and condylar fractures. This study demonstrated the influence of occlusal support and the presence of mandibular third molars on the incidence of mandibular angle and condylar fractures. The presence of occlusal support may be a more important factor affecting mandibular angle or condylar fractures than the position of the mandibular third molars.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kobe University Graduate School of Medicine, Kobe, Japan. Electronic address: hasetaku@med.kobe-u.ac.jp.
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sadakane
authors.affiliation: Department of Oral and Maxillofacial Surgery, Shin-Suma General Hospital, Kobe, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kobayashi
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kakogawa East City Hospital, Kakogawa, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Tachibana
authors.affiliation: Department of Oral and Maxillofacial Surgery, Saiseikai Hyogo-ken Hospital, Kobe, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Oko
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hyogo Prefectural Awaji Medical Center, Hyogo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Ishida
authors.affiliation: Department of Oral and Maxillofacial Surgery, Mitsubishi Kobe Hospital, Kobe, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Fujita
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kawasaki Hospital, Kobe, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Takenono
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kobe Central Hospital, Kobe, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Komatsubara
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kita-Harima Medical Center, Ono, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Takeuchi
authors.affiliation: Department of Oral and Maxillofacial Surgery, Fujii Masao Memorial Hospital, Kurayoshi, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ichiki
authors.affiliation: Department of Oral and Maxillofacial Surgery, Hirono-Kogen Hospital, Kobe, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Miyai
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Komori
mesh_terms: D000293:Adolescent; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008335:Mandibular Condyle / Q000293:injuries*; D008337:Mandibular Fractures / Q000453:epidemiology / Q000209:etiology*; D008875:Middle Aged; D008964:Molar, Third / Q000033:anatomy & histology*; D012189:Retrospective Studies; D012307:Risk Factors; D014095:Tooth, Impacted / Q000150:complications*; D055815:Young Adult
keywords: angle; condyle; mandibular fracture; mandibular third molar; occlusal support; position