Development and preliminary clinical evaluation of an optical digital border molding technique for soft tissue movement boundary in edentulous jaws
10.3760/cma.j.cn112144-20250407-00124
- VernacularTitle:无牙颌软组织运动边界光学数字整塑方法的建立与临床初步应用
- Author:
Xinkai XU
1
;
Kehui DENG
;
Sukun TIAN
;
Hu CHEN
;
Weiwei LI
;
Xing SU
;
Xiaobo ZHAO
;
Xiaojun CHEN
;
Chao MA
;
Yongjie JIA
;
Shujuan XIAO
;
Yuchun SUN
Author Information
1. 北京大学医学部医学技术研究院，北京100191
- Publication Type:Journal Article
- Keywords:
Denture, complete;
Dental impression technique;
Digital dentistry;
Edentulous jaw;
Myostatic line
- From:
Chinese Journal of Stomatology
2025;60(6):611-617
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To address the critical issue of missing dynamic border molding information in edentulous direct digital impression technology, this study explores innovative digital solutions and conducts preliminary application validation.Methods:Based on the myostatic line theory, a methodology was established: intraoral scanner (IOS) high-frequency video was utilized to dynamically capture functional molding data of soft tissues, integrated with a self-developed mobility gradient recognition algorithm to achieve dynamic threshold segmentation between the muscle dynamic zone and myostatic zone, termed "optical digital molding technology". Ten edentulous patients with well-fitting complete dentures, treated at the Department of Prosthodontics, Peking University School and Hospital of Stomatology from January 2024 to December 2024, were enrolled. The standard deviation between the muscle static line (generated by mobility gradient algorithm with thresholds of 0.3-0.7 mm) and the denture border curve was analyzed to optimize the dynamic threshold, followed by single-case clinical validation.Results:Among the mobility thresholds of 0.3-0.7 mm, the 0.5 mm threshold yielded the smallest standard deviation between the myostatic line and denture border. Clinical validation demonstrated that dentures designed with this threshold exhibited no displacement during dynamic functional tests, with marginal sealing meeting clinical standards.Conclusions:The optical digital border molding technique for edentulous soft tissue boundaries translates the myostatic line theory into quantifiable parameters for the first time. Based on data from 10 cases, a mobility threshold of 0.5 mm is recommended for clinical application.
