Correlational study of impacted and non-functional lower third molar position with occurrence of pathologies

Abstract

BackgroundLower third molar (M3) eruption is unpredictable. The purpose of this study was to correlate radiographic position of M3 on a preexistent film with the current clinical, histopathological, and radiographic findings.MethodsA retrospective cohort study was performed. The sample was collected from a database of patients covered by Medical Fund of Brazilian Army. Radiographs were obtained a minimum of 5 years prior to the presurgical visit and after their clinical exam. The primary outcome variables were the teeth positions using Pell and Gregory/Winter classifications on panoramic X-rays. Those variables were analyzed at both the beginning (T0) and end of the study (T1). Clinical assessments and histopathological study of the thirds that were extracted were performed only at T1. Correlation between the teeth positions were related to the clinical, histopathological, and radiographic parameters using statistical analysis tests with significance set at p < 0.05.ResultsTwenty-six patients with 49 M3 were assessed over 10 months. Mean age was 14.92 years at T0 and 21.87 years at T1. The average time between T0 and T1 was 6.77 years. A significant relationship (p = 0.024) was found between the presences of root resorption on the second molar if M3 presented in an IB horizontal position at T1. There was also a significant correlation (p = 0.039) between dental crowding of the anterior lower teeth with IIIB position at T0 and if the patient finished orthodontic treatment without lingual retainers.ConclusionsLower M3 in position IIIB seen in a teenager and IB seen in an adult is more likely to have negative consequences and should be followed closely.

What Are the Risk Factors for External Root Resorption of Second Molars Associated With Impacted Third Molars? A Cone-Beam Computed Tomography Study

“…This finding reinforces the theory of previous studies. 4,5,11,[20][21][22][23][24] One of our patients who had ERR Examination of ERR on the root surface, especially in the early stages, requires 3D imaging. In a recent study, CBCT and panoramic radiography were compared and the 2 methods corresponded in only 4.3% of cases.…”

Periodontal status of the second molar adjacent to the third mandibular molar

“…La prevalencia de caries distales en segundos molares adyacentes a terceros molares en este estudio fue alrededor de un cuarto de la muestra. Diversos estudios han presentado prevalencias de esta patología que van desde 14,5% (Li et al, 2017), 25,4% (Marques et al, 2017), 35,7% (Chou et al, 2917), 39% (Bokhari et al, 2017), hasta 46,9% (Camargo et al, 2016).…”

Radiographic evaluation of non-syndromic third molar agenesis in two Mediterranean populations

“…The relationship of the third molar with the adjacent second molar is an additional concern for developing pathologies [3]. In fact, a very common culprit of such malposition is pericoronitis [4]. Several authors have attempted to evaluate the position of third molar impaction and the development of pericoronitis, with conflicting conclusions [5].…”