Do the Presence of Mandibular Third Molar and the Occlusal Support Affect the Occurrence and the Mode of Mandibular Condylar Fractures?

Sukegawa, Shintaro; Saika, Masato; Kanno, Takahiro; Nakano, Keisuke; Takabatake, Kiyofumi; Kawai, Hiroki; Nagatsuka, Hitoshi; Furuki, Yoshihiko

doi:10.2485/jhtb.28.377

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…Because of the significant differences in M3 position distribution between the PR‐ and CT‐based evaluations observed in this study, the association between the mandibular condylar fracture pattern and M3 position was analyzed separately. PR‐based evaluation of the M3 position revealed no significant association between mandibular condylar fracture pattern and M3 position in the present study, consistent with Sukegawa et al 29 In contrast, a significant difference was observed between condylar intracapsular and extracapsular fractures in the distribution of the horizontal position of M3 in CT evaluations. Further comparative analysis suggested that this association between Type B and condylar base fractures was particularly prominent.…”

Section: Discussionsupporting

confidence: 90%

Assessment of relationships between condylar fracture pattern and mandibular third molar position by panoramic radiography and computed tomography: A retrospective comparative study

Zhao,

Long,

et al. 2023

Dental Traumatology

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Background/AimAlthough previous studies have revealed the influence of the mandibular third molar (M3) on mandibular condylar fracture risk and that the presence of M3 could result in different incidences of condylar and angle fractures, there have been no analyses of the influence of M3 on fracture patterns. Moreover, evaluations of M3 position using panoramic radiography have shown insufficient accuracy. This study investigated the relationship between condylar fracture patterns and M3 position using panoramic radiography and computed tomography.Materials and MethodsThis retrospective study included 280 patients with unilateral mandibular condylar fractures and ipsilateral M3 admitted to West China Hospital of Stomatology between January 2016 and June 2022. Patient medical records, panoramic radiographs, and computed tomography images were collected. The vertical and horizontal positions of M3 were classified using the Pell and Gregory system. M3 angulation was defined as the angle between the long axis of M3 and the mandibular occlusal plane. Condylar fracture patterns were classified as intracapsular (Types A–C) or extracapsular (neck and base). Data were analyzed using McNemar–Bowker test, Pearson chi‐squared test, and Fisher's exact test.ResultsClassification of M3 position differed significantly between panoramic radiography and computed tomography images (p < .05). There was a significant association between the mandibular condylar fracture pattern and M3 horizontal position on computed tomography (p < .05). Class I M3 position on computed tomography was associated with a higher incidence of intracapsular than extracapsular fractures, along with a higher incidence of Type B than base fractures; the opposite relationships were observed for Class II. No such association was identified on panoramic radiography.ConclusionsMandibular condylar fracture patterns were presumably influenced by M3 horizontal position on computed tomography. The imaging modality affected the classification of M3 position and subsequent analyses. Computed tomography is recommended for future studies to improve accuracy and reliability.

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Section: Discussionsupporting

confidence: 90%

Assessment of relationships between condylar fracture pattern and mandibular third molar position by panoramic radiography and computed tomography: A retrospective comparative study

Zhao,

Long,

et al. 2023

Dental Traumatology

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“…The molars are the keystones of the occlusal support. The investigations carried out by previous studies have shown that the absence of occlusion will lead to mandibular fractures 13 , 20 . The current study reported that the deficiency of occlusal support would lead to fractures on the condyle.…”

Section: Discussionmentioning

confidence: 99%

The influence of wisdom tooth impaction and occlusal support on mandibular angle and condyle fractures

Al-Sharani

Zhang

Mashrah

et al. 2021

Sci Rep

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This study aimed to analyze the relationship of the occlusal support together with the lower third molars to the mandibular fractures of the angle and condyle among patients in our medical institutions. This was a retrospective study that reviewed the medical records and radiographs of all patients treated for mandibular fractures from 2015 to 2019. The data collected by using picture archiving and communicating system. Only records with mandibular angle or condyle fractures were included. The dependent variable was the presence of the fractures of the mandibular angle or condyle. The independent variables were epidemiological data, third molar characteristics, existence or absence of occlusal support. The data was analyzed through Univariate logistic regression and multivariate logistic regression. From a total of 187 mandibular fractures, 44 presented mandibular angle fracture and 29 shown condyle fractures. The average age was 40.34 ± 13.47 years. The absence of occlusal support increased the chance of condyle fractures by 5.1 times (95% CI 1.61–17.29). The lack of occlusal support is more associated with condyle fractures than the presence of occlusal support, regardless of third molar presence and characteristics and other variables evaluated.

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“…Treatment requires tooth extraction surgery, extraction of the third molar is one of the most common surgical procedures worldwide. Since mandibular third molars cause a variety of complications, surgical treatment is primarily performed to treat the symptoms associated with impaction [1,2] and to prevent conditions that impair oral health, such as future dentition malocclusion [3]. Infection and neuropathy are common complications that occur after extraction of the mandibular third molars, it is known that the position of these molars in uences the occurrence of postoperative complications [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Deep Learning-based Positioning Classification of the Mandibular Third Molars: Is Multi-task Deep Learning Useful?

Sukegawa

Matsuyama

Tanaka

et al. 2021

Preprint

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Pell and Gregory, and Winter’s classifications are frequently implemented to classify the mandibular third molars and are crucial for safe tooth extraction. This study aimed to evaluate the classification accuracy of convolutional neural network (CNN) deep learning models using cropped panoramic radiographs based on these classifications. We compared the diagnostic accuracy of single-task and multi-task learning after labeling 1,330 images of mandibular third molars from digital radiographs taken at the Department of Oral and Maxillofacial Surgery at a general hospital (2014-2021). The mandibular third molar classifications were analyzed using a VGG 16 model of a CNN. We statistically evaluated performance metrics (accuracy, precision, recall, F1 score, area under the curve [AUC]) for each prediction. We found that single-task learning was superior to multi-task learning (all p<0.05) for all metrics, with large effect sizes and low p-values. Recall and F1 scores for position classification showed medium effect sizes in single and multi-task learning. To our knowledge, this deep learning study is the first to examine single-task and multi-task learning for the classification of mandibular third molars. Our results demonstrated the efficacy of implementing Pell and Gregory, and Winter’s classifications for specific respective tasks.

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Do the Presence of Mandibular Third Molar and the Occlusal Support Affect the Occurrence and the Mode of Mandibular Condylar Fractures?

Cited by 5 publications

References 19 publications

Assessment of relationships between condylar fracture pattern and mandibular third molar position by panoramic radiography and computed tomography: A retrospective comparative study

Assessment of relationships between condylar fracture pattern and mandibular third molar position by panoramic radiography and computed tomography: A retrospective comparative study

The influence of wisdom tooth impaction and occlusal support on mandibular angle and condyle fractures

A Deep Learning-based Positioning Classification of the Mandibular Third Molars: Is Multi-task Deep Learning Useful?

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