Purpose During mastication, mechanical pressure from the dentition is transmitted to the trabecular bone of the mandible. The occlusal forces, which could thus aVect condylar growth, vary with tooth loss, age, and sex. The trabecular bone of the mandibular condyle is denser in dentate subjects than in edentate subjects. However, since the diVerent tooth groups (incisor, premolar, and molar) have diVerent functions, they could exert diVerent eVects on the mandibular condyle. The aim of this study was to elucidate the bone quantity of the Korean mandibular condyle according to the presence of teeth using micro-computed tomography (micro-CT), thereby clarifying the inXuences of tooth presence on the condylar microstructure. Methods Thirty-one sides were scanned and reconstructed into a 3D structure using a micro-CT system. The specimen was sectioned vertically, passing through the medial and lateral poles of the mandibular condyle (P0) to enable measurement of the trabecular bone ratio. Likewise, three additional images, parallel with P0, were acquired. Mean and standard deviation values were calculated, and the t test, one-way ANOVA and post hoc analysis were performed to examine the diVerences among each group, classiWed according to the presence of teeth and according to sex. Results The density of the trabecular bone of the mandibular condyle was signiWcantly associated with the presence of the molars, but not the incisors or premolars. There were signiWcant diVerences between sexes. Conclusions The present study has provided data regarding the bone quantity of the trabeculae of the mandibular condyle according to the presence or absence of teeth.
Bibliographical noteFunding Information:
Acknowledgments This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (R13-2008-013-03001-0).
All Science Journal Classification (ASJC) codes
- Pathology and Forensic Medicine
- Radiology Nuclear Medicine and imaging