New intraoral digital impression with pneumatic gingival retraction used in the restoration of crown for posterior teeth: a case report
10.3760/cma.j.cn112144-20240530-00227
- VernacularTitle:基于气动排龈口内数字化印模新技术的后牙单冠修复治疗1例
- Author:
Xinkai XU
1
;
Meizi ZHANG
;
Zhongning LIU
;
Yuchun SUN
;
Hu CHEN
;
Weiwei LI
;
Xiaoyi ZHAO
;
Yongjie JIA
;
Shujuan XIAO
;
Chao MA
;
Xiaojun CHEN
;
Tengfei JIANG
;
Xiaobo ZHAO
;
Sukun TIAN
Author Information
1. 北京大学口腔医学院·口腔医院口腔医学数字化研究中心 口腔修复教研室 国家口腔医学中心 国家口腔疾病临床医学研究中心口腔生物材料和数字诊疗装备国家工程研究中心 国家卫生健康委口腔医学计算机应用工程技术研究中心 口腔数字医学北京市重点实验室，北京 100081
- Keywords:
Dental impression technique;
Computer-aided design;
Gingival retraction;
Intraoral scanning;
Pneumatic gingival retraction;
Intraoral digital impression
- From:
Chinese Journal of Stomatology
2024;59(10):1044-1048
- CountryChina
- Language:Chinese
-
Abstract:
In fixed prosthodontics, clear exposure of the preparation margin is the prerequisite for obtaining accurate digital impressions and improving the marginal fit of restorations. To resolve the issues associated with the cord retraction technique, such as pain, acute injury, and prolonged procedural time, this study proposes a new technology for intraoral digital impression taking with pneumatic gingival retraction. The new scanning head blows a high-speed airflow that instantaneously separates the free gingiva, locally exposing the subgingival preparation margin. Combined with the farthest point preservation stitching algorithm based on the distance from the normal vector and high-speed laser scanning photography, it achieves global preparation edge data and gingival reconstruction, realizing painless, non-invasive, and efficient precise acquisition of the preparation margin. Using this new technique, a patient with a full porcelain crown restoration on a posterior tooth was treated. The digital impression revealed a clear margin of the preparation, and the crown made from this data has a good marginal fit.
