Some morphological features related to mandibular third molar impaction

Abstract

Objective: The aim of this study was to evaluate the effect of some morphological features of the mandible and mandibular permanent molars on impaction of mandibular third molars with panoramic measurements in a Turkish patient group. Study design: Standardized panoramic radiography variables compiled from 140 patients retrospectively were evaluated. Predictive variables included mesio-distal crown width and inclination of the mandibular molars, vertical and horizontal surface dimension between distal surface of the lower second molar tooth and anterior surface of its ramus, length and width of the mandible ramus and corpus, angle of the mandible gonion, the number of the lower third molar roots, and angulations of roots of the lower third molars. Results and Conclusions: According to the data obtained in this study, the vertical height of the anterior border of the ramus, length of the posterior basal corpus, mesio-distal diameters of the first, second and the third molars, 1/3 root angle of the third molar, number of third molar roots, inclination of the first molar to increase, vertical height of the posterior border of the ramus, vertical height of alveolar crest, and height and the width of the retro-molar space to decrease are all in direct proportion to the possibility of impaction of the third molar.

Identifying the Most Accurate Available Space Analysis Method for Predicting Mandibular Third Molar Eruption or Impaction by Means of Panoramic Radiographs

“…The determining role of this factor has been advocated by Kaya and Tsai study in which the width of first and second molar was lesser in erupted group than the impacted group (4,17). This is consistent with the observation of the current study.…”

“…2017; 12(1):e6501. (19.1 mm for females and 17.9 mm for males) in which the retromolar space was wider for females than males (17). This finding was contrary to other studies that reported larger retromolar space for males.…”

“…Gonial angle has also been addressed as a potential contributing factor, albeit in this study as well as some previous investigations (5,17,18). No correlation was observed between this angle and MTM impaction.…”

“…The angle between the lower one-third of third molar root with the line axis of third molar (tmdra) can be affected by movements of mandible and teeth especially when the anterior border of the ramus is resorbed and the corpus mandible is enlarged (24,25). Kaya et al addressed this angle and reported increased risk of impaction with decreased angle particularly the mesial root angle with the tooth line angle (17).…”

Impacted Teeth: An Interdisciplinary Perspective

“…1) ranges from 16.7% to 68.6% [8]. Most studies have reported no sexual predilection in third molar impaction [9]. However, some studies found a higher frequency in females than in males [10].…”