Romalee Worachate, Kettratad Matana, Trang Tran Thi Ngoc, Wang Ding-Han, Chen Jia-En, Hsu Ming-Lun
College of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan.
Department of Community Dentistry & Gerodontology, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand.
J Dent Sci. 2022 Jul;17(3):1335-1341. doi: 10.1016/j.jds.2022.04.010. Epub 2022 Apr 26.
BACKGROUND/PURPOSE: The characteristic of soft tissue changes in buccal shelf area during function is unclear. This study aimed for evaluating the potential denture covering area in buccal shelf area in different ranges of mouth opening by a digital approach.
Nineteen qualified dentate participants were enrolled. An intraoral scanner was used to record soft tissue in buccal shelf area in different ranges of mandibular opening, which were maximum intercuspation, 10 mm, 20 mm, and 30 mm of interincisal distance. The experiment was performed by two examiners. The common area of each range was generated within the clinically acceptable denture adaptation range, which was represented as the potential denture covering area. Data were statistically analyzed using descriptive statistic, one-way repeated measure ANOVA, intraclass correlation coefficient (ICC), and the Pearson correlation test.
Trends of the mean distance of the potential denture covering area increased from the frenum area to the second premolar and the first molar area then decreased in the second molar area, along with the ranges of mouth opening increased. The distance in the second molar area had drastic percentage changes during the mouth opening. The mean distances changed significantly when the mouth opening increased ( < 0.001). All ICC values of intra-, inter-rater reliability indicated good to excellent reliability. The correlation between the results from two examiners was strong ( < 0.001).
The characteristic of the denture covering area posteriorly to the first molar area is inversely proportional in length to ranges of mouth opening.
背景/目的：颊侧翼缘区在功能状态下软组织变化的特征尚不清楚。本研究旨在通过数字化方法评估不同开口度下颊侧翼缘区的义齿覆盖潜在区域。
招募了19名合格的有牙颌参与者。使用口腔内扫描仪记录下颌在不同开口度（即最大牙尖交错位、切牙间距离10mm、20mm和30mm）时颊侧翼缘区的软组织情况。实验由两名检查者进行。在临床可接受的义齿适配范围内生成每个开口度的共同区域，将其表示为义齿覆盖潜在区域。使用描述性统计、单向重复测量方差分析、组内相关系数（ICC）和Pearson相关检验对数据进行统计学分析。
随着开口度增加，义齿覆盖潜在区域的平均距离从系带区向第二前磨牙和第一磨牙区增加，然后在第二磨牙区减小。在开口过程中，第二磨牙区的距离有急剧的百分比变化。当开口度增加时，平均距离有显著变化（<0.001）。所有检查者内、检查者间可靠性的ICC值均显示出良好至优秀的可靠性。两名检查者的结果之间相关性很强（<0.001）。
第一磨牙区后方的义齿覆盖区域特征在长度上与开口度成反比。
