Risk factors for root resorption of second molars associated with impacted mandibular third molars |
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| Affiliation: | 1. Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Bern, Switzerland;2. Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China;3. Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China;1. Department of Oral and Maxillofacial Surgery, Hospital Sibu, Sarawak, Malaysia;2. University of North Sumatera, Medan, North Sumatera, Indonesia;3. Craniofacial Centre and Craniofacial Research Centre, Chang Gung Memorial Hospital, Chang Gung University, Taoyuan, Taiwan;4. Craniofacial Centre, Taipei Medical University Hospital and Taipei Medical University, Taipei, Taiwan;1. Department of Diagnosis and Surgery, School of Dentistry at Araraquara, São Paulo State University – UNESP, Araraquara, São Paulo, Brazil;2. Department of Health Sciences, Implantology Post Graduation Course, University Centre of Araraquara – UNIARA, São Paulo, Brazil;1. Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA;2. Department of Oral and Maxillofacial Surgery, University of Michigan, Ann Arbor, MI, USA;3. Department of Periodontics and Oral Medicine, University of Michigan, Ann Arbor, MI, USA;4. Kitware Inc., Carrboro, NC, USA;1. Department of Oral and Maxillofacial Surgery, School of Dentistry, Centro Universitário Christus, Fortaleza, Brazil;2. Department of Pathology, School of Medicine, Universidade de Fortaleza, Fortaleza, Brazil;3. School of Dentistry, Federal University of Ceará, Fortaleza, Brazil;4. Department of Oral and Maxillofacial Surgery, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil;5. Department of Dental Clinic, Discipline of Oral and Maxillofacial Surgery and Stomatology, Federal University of Ceará School of Dentistry, Fortaleza, Brazil;6. Department of Oral and Maxillofacial Surgery, Memorial Batista Hospital, Fortaleza, Brazil |
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| Abstract: | External root resorption (ERR) affecting mandibular second molars (M2) may occur when the adjacent third molar (M3) is impacted in close proximity. This retrospective cohort study aimed to assess the presence, severity, and location of ERR on M2 due to M3 using cone beam computed tomography (CBCT) scans and to identify associated factors. The angle between the axis of M2 and M3 was measured. ERR on M2 was classified as absent, slight, moderate, or severe. The location of contact between M3 and M2, the size of the dental follicle, and patient demographic characteristics were recorded. A total of 433 patients with 640 M3 were included. A male predilection was found with regard to ERR (P = 0.0004). ERR was identified on 31.9% of M2 and was slight in 30.2%, moderate in 1.4%, and severe in 0.3% of cases. The presence of ERR was associated with direct contact between M2 and M3 (P < 0.0001), the angle between M2 and M3 (P < 0.0001), the inclination of M3 (P = 0.001), and the location of contact (P = 0.0005). This study showed ERR to be a frequent finding. ERR is associated with a mesioangular position of M3 in more than one third of cases, and a proximity ≤0.5 mm between M2 and M3 favours ERR. |
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| Keywords: | root resorption cone beam computed tomography wisdom tooth third molar second molar |
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