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目的:应用一种新的全颌曲面断层分析方法来判断牙周炎组和正常组之间的相对骨密度(RBD)的差异,并预测下颌角骨折的风险。方法:回顾性研究60例牙周炎患者和60例正常组病例,应用全颌曲面断层片比较其相对骨密度(RBD)。同时,调查所有患者的下颌角骨折病史并做记录。结果:牙周炎组和正常组之间的三个RDB指数的差异有明显统计学意义。正常组有3例下颌角骨折患者,牙周炎组有8例下颌角骨折病例。两组下颌角骨折患者RBD指数均相对较低。结论:牙周炎组和正常组的RBD指数之间具有明显统计学意义,RBD指数可以作为普通全颌曲面断层片的一种新的分析方法。可用做牙周炎的筛选工作,并在一定程度上可以预测发生下颌角骨折的风险。
OBJECTIVE: To determine the difference of relative bone mineral density (RBD) between periodontitis group and normal group by using a new method of total jaw curved surface tomography to predict the risk of mandibular angle fracture. Methods: Sixty patients with periodontitis and 60 normal controls were retrospectively studied. The relative total body mineral density (RBD) was measured by using all-round curved facetted slice. At the same time, all patients were investigated for history of mandibular angle fracture and recorded. Results: The difference of three RDB index between periodontitis group and normal group was statistically significant. In the normal group, there were 3 cases of mandibular angle fractures and 8 cases of mandibular angle fractures in the periodontitis group. RBD index of the two groups of mandibular angle fractures were relatively low. Conclusion: The RBD index between periodontitis group and normal group is statistically significant, and RBD index can be used as a new analysis method for common maxillary curved surface slice. Can be used as a periodontal screening, and to a certain extent, can predict the risk of occurrence of mandibular angle fracture.