A Study of the Factors Associated with Mandibular Bone Width, Focusing on Occlusal Status and Masseter Width

• Published in: Journal of Japanese Society of Oral Implantology Vol. 35; no. 3; pp. 204 - 211
• Main Authors: KON, Takao, KOBAYASHI, Wataru, TANAKA, Yusuke, FURUDATE, Ken, OYAMA, Toshiaki, ITO, Ryohei, SATAKE, Anna, KIMURA, Hiroto
• Format: Journal Article
• Language: Japanese
• Published: Japanese Society of Oral Implantology 30.09.2022
• Subjects: implant treatment; mandibular bone width; masseter width; occlusal status
• DOI: 10.11237/jsoi.35.204
• ISSN: 0914-6695

Objective : Mandibular bone width is an extremely important consideration when conducting implant treatment, but no study has examined its association with occlusal status. The objective of this study was therefore to identify factors associated with mandibular bone width, including occlusal status.Subjects and Methods : The bone width at the midline of the mandible, the bone width at the anterior margin of the mandibular ramus, and the maximum masseter width were measured in two groups of patients who had undergone computed tomography scanning for a condition unrelated to implant surgery, one group with normal occlusion and the other with reversed occlusion.Results : Statistical analysis showed that, in women, the minimum bone width at the midline of the mandible and the minimum bone width at the anterior margin of the mandibular ramus were significantly narrower in individuals with reversed occlusion. In both men and women, the maximum masseter width was significantly narrower in individuals with reversed occlusion. An investigation of the correlation between maximum masseter width and mandibular bone width identified significant correlations between the maximum masseter width and the minimum bone width at the midline of the mandible (r＝0.429, p＝0.014) and the minimum bone width at the anterior margin of the mandibular ramus (r＝0.354, p＝0.047) in women. Regression analysis of factors related to the minimum bone width of the mandible found that occlusion was the only factor significantly associated with bone width at the midline of the mandible (β＝－0.244, p＝0.042) and bone width at the anterior margin of the mandibular ramus (β＝－0.267, p＝0.026).Conclusions : The results of this study demonstrated that the occlusal relationship contributes to mandibular bone width and masseter width, and that the mandibular bone of patients with mandibular prognathism tends to be comparatively thinner than that of individuals with normal occlusion.