基于下颌运动轨迹和虚拟𬌗架运动参数模拟咬合调整的对比研究。
A comparative study based on the mandibular movement track and the movement parameters of the virtual articulator in simulating occlusal adjustment.
机构信息
State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
出版信息
Hua Xi Kou Qiang Yi Xue Za Zhi. 2023 Jun 1;41(3):254-259. doi: 10.7518/hxkq.2023.2022452.
OBJECTIVES
This study aimed to compare the effects of virtual adjustment on occlusal interferences in mandibular posterior single crown and three-unit bridge restorations by using the mandibular movement track and the movement parameters of a virtual articulator.
METHODS
Twenty-two participants were recruited. Digital casts of the maxillary and mandibular arches were obtained using an intraoral scanner, and the jaw registration system was used to record the data of the mandibular movement track and the movement parameters of the articulator. Four kinds of restorations with 0.3 mm occlusal interferences were designed with dental design software. In particular, single crowns were designed for teeth 44 and 46, whereas three-unit bridges were designed for teeth 44-46 and 45-47, and the corresponding natural teeth were virtually extracted. Virtual adjustment of the restorations was performed using two dynamic occlusal recordings, namely, the mandibular movement track and the movement parameters of the virtual articulator. A reverse-engineering software was used to measure the root-mean-square of the three-dimensional deviation of the occlusal surfaces between natural teeth and the adjusted restorations. The differences between the two methods of virtual-occlusion adjustment were compared and analyzed.
RESULTS
For the same group of restorations, the three-dimensional deviation of the mandibular movement track group were lower than those of the virtual articulator group, and the differences were statistically significant (<0.05). For the four groups of restorations adjusted by the same method, the three-dimensional deviation of the 46-tooth single crown was the largest and the smallest three-dimensional deviation was that of the 44-tooth single crown. Statistical differences existed between the 44-tooth single crown and the other groups (<0.05).
CONCLUSIONS
For the occlusal design of posterior single crown and three-unit bridge, the mandibular movement track could be a more effective approach to virtual occlusal adjustment than the movement parameters of the virtual articulator.
目的
本研究旨在通过下颌运动轨迹和虚拟𬌗架的运动参数比较虚拟调整对下颌后牙单冠和三单位桥修复体𬌗干扰的影响。
方法
招募了 22 名参与者。使用口腔内扫描仪获取上颌和下颌弓的数字模型，并使用颌架定位系统记录下颌运动轨迹和𬌗架运动参数的数据。使用牙科设计软件设计了四种具有 0.3mm 𬌗干扰的修复体。具体来说，44 号和 46 号牙设计为单冠，44-46 号和 45-47 号牙设计为三单位桥，相应的天然牙被虚拟拔除。使用两种动态𬌗记录（即下颌运动轨迹和虚拟𬌗架的运动参数）对修复体进行虚拟调整。使用逆向工程软件测量天然牙和调整后的修复体的牙合面三维偏差的均方根。比较和分析了两种虚拟咬合调整方法的差异。
结果
对于同一组修复体，下颌运动轨迹组的三维偏差低于虚拟𬌗架组，差异具有统计学意义（<0.05）。对于同一方法调整的四组修复体，46 号牙单冠的三维偏差最大，44 号牙单冠的三维偏差最小。44 号牙单冠与其他组之间存在统计学差异（<0.05）。
结论
对于后牙单冠和三单位桥的𬌗设计，下颌运动轨迹可能是比虚拟𬌗架运动参数更有效的虚拟咬合调整方法。
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