Maxillary third molars with horizontal impaction: A cross-sectional study using computed tomography in young Japanese patients

Abstract

Objective To examine the anatomical characteristics of impacted maxillary third molars to help predict and prevent possible adverse events during extraction. Methods This retrospective study enrolled young Japanese patients that were assessed for third molar extraction. Patients with maxillary third molar impaction presenting with no space between the maxillary second molar and the occlusal surface of the maxillary third molar were analysed using computed tomography data. Results In this study, a total of 663 patients aged 20–29 years were examined for third molar extraction and 26 teeth in 23 patients were analysed. The mean ± SD angle between the second and third molar axes was 54.2° ± 7.5° and the mean ± SD length of the maxillary third molar was 16.1 ± 1.9 mm. The maxillary third molars showed close or extensive contact with the maxillary sinus and computed tomography did not show any bone from the maxillary sinus floor. Furthermore, in all patients, the crowns of the third molars were not completely covered by the alveolar bone. Conclusions Maxillary third molars with horizontal impaction showed close or extensive contact with the maxillary sinus and their crowns were not completely covered by the alveolar bone.

Palatal approach for surgical removal of mesioangularly impacted maxillary third molar - a pilot study

“…We proposed a new classification based on the buccal-palatal relationship between the maxillary third molar and the second molar shown on the CBCT: partial buccal position, middle position, and partial palatal position. Similar to the previous study [ 16 ], the crowns of the IMTM were not completely covered by the alveolar bone shown in CBCT. It is only visible after the flap was elevated.…”

“…Archer et al classified IMTMs into mesioangular, distoangular, vertical, horizontal, buccoangular, linguoangular, or inverted [ 16 , 17 ]. It is classified as Class A, B, and C according to the depth of impaction in relation to the second molar.…”

A preliminary study on the assessment of pain using figures among patients administered with dental local anesthesia for mandibular third molar extraction

“…Oral maxillofacial surgeons usually inject anesthetics into non-inflamed normal tissue during extraction of mandibular and maxillary third molars, without general anesthesia, and without violating medical ethics or the Declaration of Helsinki. [9][10][11][12] Therefore, we considered third molar extraction an ideal medical procedure for a preliminary study of new pain scales without verbal descriptions.…”

Correlation between the Extraction of Permanent Teeth in Children and Future Growth of Third Molar

“…It is possible for the mandibular third permanent molar, also known as the M3, to display a great deal of variability depending on the individual in terms of its agenesis, its timing of formation, and its morphology [1]. Calcification happens between the ages of seven and ten years old in the vast majority of cases; however, in exceptional cases, it can take as long as fourteen years to take place [2]. Eruption is a natural process that typically occurs between the ages of seventeen and twenty-one and can sometimes occur earlier.…”

“…The third molars have a better chance of erupting into position if they are angled at an upright position and there is space for them in the mouth. It is possible to remove first permanent molars (M1) with a poor prognosis as early as possible in order to encourage mesial movement of the second permanent molar [2]. This is done by extracting the tooth as soon as possible after it has become visible [3].…”