Typodont model study on double keyhole loop in mandibular extraction space closure
10.12016/j.issn.2096-1456.2020.10.004
- Author:
CAI Senxin
1
,
2
,
3
;
LIU Jiali
1
,
2
,
3
;
CHEN Zexing
1
,
2
,
3
;
XU Linyu
4
,
5
;
SU Jiehua
4
,
5
Author Information
1. Fujian Key Laboratory of Oral Diseases &
2. Fujian Provincial Engineering Research Center of Oral Biomaterial &
3. Stomatological Key Lab of Fujian College and University, School and Hospital of Stomatology, Fujian Medical University
4. Institute of Stomatology &
5. Research Center of Dental and Research Center of Dental Esthetics and Biomechanics, School and Hospital of Stomatology, Fujian Medical University
- Publication Type:Journal Article
- Keywords:
double keyhole loop;
typodont;
reverse engineering;
orthodontic treatment;
orthodontic space closure;
crown shape;
three-dimensional move
- From:
Journal of Prevention and Treatment for Stomatological Diseases
2020;28(10):635-640
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To analyze the impact of the activation mode on the results of space closure in the mandibular arch using a double keyhole loop (DKHL) with a typodont model and reverse engineering technique to provide guidance for clinical treatment.
Methods:Nine normal mandibular typodont models after leveling were randomly divided into 3 groups, which then underwent three types of DKHL activation for space closure. Each model was assessed at the initial stage and after the warm water bath, and the images were superimposed to measure the displacement of special crown and root mark points. All statistical analysis of the data was performed using SPSS 19.0
Results: After equal activation times, the root retraction of anterior teeth and the crown forward position of posterior teeth in groups activated at the distal loop (conditions 2 and 3) were much greater than those in the group activated horizontally (condition 1). Activation between mesial and distal loops (condition 3) induced significant anterior tooth intrusion, together with elongation and buccal inclination of posterior teeth. The displacement of mark points among the three conditions showed a statistically significant difference.
Conclusion : The movement of mandibular anterior and posterior teeth could be flexibly controlled through different DKHL activation modes, which should be chosen carefully according to individual conditions.
- Full text:双钥匙曲关闭下颌拔牙间隙的Typodont模型研究.pdf
