Relationship between the Position of Impacted Third Molars and External Root Resorption of Adjacent Second Molars: A Retrospective CBCT Study

Abstract

Background and objectives: Impacted third molars (ITM) are the most commonly-impacted teeth. There is a risk for ITM to cause a number of pathological conditions, and external root resorption (ERR) of adjacent teeth is one of the most prevalent. Retaining or prophylactic extraction of ITM is a polemic topic. External root resorption of adjacent teeth is one of possible indications for prophylactic removal of ITM. The aim of this study was to assess the relationship between external root resorption (ERR) on the distal aspect of second molars’ roots and positional parameters of ITM. Methods: Cone beam computed tomography scans of 109 patients (41 males, 68 females; mean age 26.4 ± 7.9 years) with 254 ITM (131 in the maxilla and 123 in the mandible) were retrospectively analyzed. Positional parameters of ITM (mesio-distal position, angulation, impaction depth, and available eruption space) were evaluated. The presence, location, and depth of ERR of adjacent second molars were assessed. Results: Analysis showed a relationship between ITM impaction depth, mesial inclination angle, and the presence of ERR. Mesial inclination angle of more than 13.6° increased the odds of ERR occurrence by 5.439 (95% CI, 2.97–9.98). ITM presence at the level of ½ of roots of the adjacent second molar or more apically increased the odds of ERR occurrence by 2.218 (95% CI, 1.215–4.048). No significant correlation was detected between the occurrence of ERR and patient age, gender, or the available eruption space in the mandible. Depth of ERR did not depend on its location. Conclusions: Incidence of ERR in second molars is significantly associated with mesial inclination and a deep position of ITM.

The Evaluation of Further Complications after the Extraction of the Third Molar Germ: A Pilot Study in Paediatric Dentistry

“…Ganss C. et al [35], in their retrospective study, evaluated the delayed-onset infection rate correlated to the distal space of the second molar. The ratio between the distal space and the crown width, both measured according to Ganss's protocol on panoramic radiographies, was obtained for 218 germectomies performed due to orthodontic reasons in 134 patients.…”

Gömülü Mandibular Üçüncü Molar Dişin Çekimi Sonrası Komşu İkinci Molar Dişin Tedavi Gereksiniminin Retrospektif Olarak Değerlendirilmesi

“…2 Bununla birlikte, Winter 14 sınıflamasına göre mezyoanguler ve horizontal angulasyon gösteren gömülü mandibular üçüncü molar diş çekimi esnasında veya operasyonu takiben komşu ikinci molar dişte travma riskinin daha yüksek olduğu bildirilmiştir. 15 Bu bilgiler doğrultusunda, çalışmamızın amacı, gömülü mandibular üçüncü molar dişin operatif çekimi sonrası komşu ikinci molar dişin periodontal ve endodontik tedavi gereksinimlerini retrospektif olarak değerlendirmektir. Bu komplikasyonlar arasında, gömülü üçüncü molar dişin cerrahi çekimi sırasında komşu ikinci molar dişin iatrojenik sublüksasyon yaralanmaları ile ikinci molar dişin distalinde var olan ve/veya sonradan meydana gelen semptomatik/asemptomatik periodontal lezyonlar, ilgili ikinci molar dişin prognozunda önemli bir rol oynamaktadır.…”

Influence of orthodontic treatment with premolar extraction on the spatial position of maxillary third molars in adult patients: a retrospective cohort cone-bean computed tomography study

“…Third molars are reported with the highest frequency of impaction [3] and impacted third molars are closely related to complications [4], among which possible late incisor crowding and post-orthodontic relapse are main concerns of orthodontists [5]. Therefore, many asymptomatic third molars were extracted for prophylactic purposes on dentists' personal values and empirical basis [6].…”

“…Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA 4. State Key Laboratory…”