Chen Shuang, Zhong Qun, Weng Bei-Jun, Ye Ye, Qian Yu-Mei
Department of Prosthodontics, Shanghai Stomatological Hospital. Shanghai 200031, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2019 Jun;28(3):275-278.
To explore the correlation between increased vertical dimensions and temporomandibular joint (TMJ) spaces of patients with severe tooth wear after occlusal reconstruction treatment.
The TMJ spaces and the condylar positions of 30 patients were measured by cone-beam CT (CBCT) before and after treatment. SPSS 19.0 software package was used to analyze the anterior, superior and posterior space of TMJ. Independent sample t test was utilized to evaluate the correlation between vertical dimension and TMJ spaces.
There was no significant difference between TMJ spaces of two sides, the data of two sides were combined for further analysis. The mean anterior interspace, superior interspace, posterior interspace was (2.01±0.52)mm, (3.15±0.94)mm, (2.70±0.98)mm before treatment, and (2.03±0.35)mm, (3.46±0.74)mm, (2.79±0.58)mm after treatment, respectively. Based on calculating the In(P/A) and linear ratio(LR), condylar position moved backward for 52% patients before treatment. After occlusal reconstruction, the reduction rate of anterior displacement of condyle was 86.7%.
In addition to restoring its vertical dimensions of patients with severe tooth wear, the condyle should be induced to appropriate position to prevent TMJ symptoms.
探讨重度磨耗患者咬合重建治疗后垂直距离增加与颞下颌关节（TMJ）间隙之间的相关性。
对30例患者治疗前后采用锥形束CT（CBCT）测量TMJ间隙及髁突位置。应用SPSS 19.0软件包分析TMJ的前间隙、上间隙和后间隙。采用独立样本t检验评估垂直距离与TMJ间隙之间的相关性。
两侧TMJ间隙差异无统计学意义，将两侧数据合并进行进一步分析。治疗前平均前间隙、上间隙、后间隙分别为（2.01±0.52）mm、（3.15±0.94）mm、（2.70±0.98）mm，治疗后分别为（2.03±0.35）mm、（3.46±0.74）mm、（2.79±0.58）mm。通过计算In（P/A）和线性比率（LR），治疗前52%的患者髁突位置向后移动。咬合重建后，髁突前移位的减少率为86.7%。
对于重度磨耗患者，除恢复其垂直距离外，还应将髁突诱导至合适位置以预防TMJ症状。
