3D Facial Changes Between Maximal Intercuspal Position and Physiologic Rest Position.

IF 2.1 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

International Journal of Prosthodontics Pub Date : 2023-09-12 DOI:10.11607/ijp.7533

Ingo Oblak, Nataša Ihan Hren, Miha Verdenik

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引用次数: 0

Abstract

Purpose: To evaluate the soft tissue changes of the face between two positions of occlusion: maximal intercuspal position (MIP) and physiologic rest position (RP).

Materials and methods: In this study, facial surface scans of 83 volunteers in two mandibular positions (MIP and RP) were obtained using a 3D optical scanner. On each 3D image, 21 cephalometric soft tissue landmarks were identified and then compared using t test for various facial parameters (widths, heights, depths, angles, and ratio). Additionally, a regional analysis of the facial surface differences in each patient between the two mandibular positions was performed using a whole scan shell best-fit method and the regional forehead best-fit method.

Results: In MIP, facial heights with the nasion-gnathion distance shortened by approximately 1.2 mm (due to the vertical shrinkage of both lips together by 0.8 mm), and the mouth width was significantly widened, while other facial widths displayed no change. The labiomental angle and the upper vermilion arch were altered correspondingly, and regional analysis confirmed the findings with evident changes in the mandibular and subnasal areas with deviations amplified toward the facial midline.

Conclusions: By applying 3D facial-scanning technology, this study displayed changes of facial appearance in different mandibular positions (MIP and RP), highlighting the need to instruct and monitor the patient's mandibular position more consistently to achieve accurate and repeatable data in a 3D facial analysis.

查看原文本刊更多论文

最大尖间位与生理休息位之间的三维面部变化。

目的:探讨最大尖间位(MIP)和生理休息位(RP)两种咬合位置对面部软组织的影响。材料与方法:本研究使用三维光学扫描仪对83名志愿者在下颌两个位置(MIP和RP)进行面部扫描。在每张3D图像上，识别21个头部软组织地标，然后使用t检验比较各种面部参数(宽度、高度、深度、角度和比例)。此外，使用全扫描壳最佳拟合方法和区域前额最佳拟合方法对每个患者在两个下颌位置之间的面部表面差异进行区域分析。结果:在MIP中，面部高度随着鼻颌距离缩短约1.2 mm(由于两唇一起垂直收缩0.8 mm)，口宽明显变宽，而其他面部宽度没有变化。唇唇角和上朱红色弓相应改变，区域分析证实，下颌骨和鼻下区变化明显，向面部中线方向偏移放大。结论:通过应用3D面部扫描技术，本研究显示了不同下颌位置(MIP和RP)下面部外观的变化，强调需要更一致地指导和监测患者下颌位置，以便在3D面部分析中获得准确和可重复的数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Prosthodontics 医学-牙科与口腔外科

CiteScore

3.20

自引率

4.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Official Journal of the European Association for Osseointegration (EAO), the International College of Prosthodontists (ICP), the German Society of Prosthodontics and Dental Materials Science (DGPro), and the Italian Academy of Prosthetic Dentistry (AIOP) Prosthodontics demands a clinical research emphasis on patient- and dentist-mediated concerns in the management of oral rehabilitation needs. It is about making and implementing the best clinical decisions to enhance patients'' quality of life via applied biologic architecture - a role that far exceeds that of traditional prosthetic dentistry, with its emphasis on materials and techniques. The International Journal of Prosthodontics is dedicated to exploring and developing this conceptual shift in the role of today''s prosthodontist, clinician, and educator alike. The editorial board is composed of a distinguished team of leading international scholars.