Hafezeqoran Ali, Koodaryan Roodabeh, Noorazar Seyed Gholamreza, Hajialilue-Bonab Masoud, Hassanzadeh Mehran, Yasamineh Neda
Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Research center of Psychiatry and Behavioral Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2018 Winter;12(1):18-25. doi: 10.15171/joddd.2018.004. Epub 2018 Mar 14.
Various occlusal schemes have been introduced over the years to enhance the stability, comfort, beauty and function of complete denture, of which lingualized, bilateral balanced and monoplane occlusions are the most recommended. The aim of this study was to compare the strain in mandibular denture-supporting structures in three different occlusal schemes. Two mandibular and maxillary models were simulated using epoxy resin, and strain gauges were embedded on each side of the mandible in mental foramen, buccal shelf and distolingual area. Strain values were measured in three occlusal schemes at centric occlusion protrusive and lateral movements. Data were analyzed with one-way and three-way ANOVA, followed by post-hoc Tukey tests. The significant level was set at 0.05. The mean strain in denture-supporting area was lower in monoplane occlusion than the two other occlusal schemes, and the mean of values in the buccal shelf was higher than that of mental foramen and distolingual area. In all the three occlusal schemes, the mean strain values on the working side were higher than those on the non-working side during eccentric movements. Monoplane occlusal scheme imposed lower strain on denture-supporting area, with the buccal shelf being the primary strain-bearing area to tolerate more pressure than the rest of the denture-supporting areas. In terms of strain distribu-tion scheme, in all the three occlusal schemes, the working side received more strain than the non-working side during eccen-tric movements.
多年来，人们提出了各种咬合方案以提高全口义齿的稳定性、舒适度、美观度和功能，其中舌侧集中、双侧平衡和单平面咬合是最常被推荐的。本研究的目的是比较三种不同咬合方案在下颌义齿支持结构中的应变。使用环氧树脂模拟了两个下颌和上颌模型，并在下颌骨两侧的颏孔、颊侧翼缘区和远中舌侧区域植入应变片。在正中咬合、前伸和侧方运动的三种咬合方案中测量应变值。数据采用单因素和三因素方差分析，随后进行事后Tukey检验。显著性水平设定为0.05。单平面咬合时义齿支持区域的平均应变低于其他两种咬合方案，颊侧翼缘区的值高于颏孔和远中舌侧区域。在所有三种咬合方案中，非工作侧的平均应变值高于工作侧。单平面咬合方案对义齿支持区域施加的应变较低，颊侧翼缘区是主要的应变承受区域，比义齿支持的其他区域承受更多压力。就应变分布方案而言，在所有三种咬合方案中，非工作侧在非工作侧的应变高于工作侧。
