Publications

Detailed Information

Effects of various types of orthodontic wires and brackets on the torque expression by wire twisting : 브라켓 유형과 교정용 호선의 재질이 토오크 생성에 주는 영향

Cited 0 time in Web of Science Cited 0 time in Scopus
Authors

강혜연

Advisor
임범순
Major
치의학대학원 치의과학과
Issue Date
2015-02
Publisher
서울대학교 대학원
Keywords
torquetwistconventional bracketself-ligating bracketceramic bracketmetal bracketorthodontic wire
Description
학위논문 (석사)-- 서울대학교 대학원 : 치의과학과, 2015. 2. 임범순.
Abstract
1. Objectives: The purpose of this study was to compare the torque capability of different types of bracket and arch wire combinations, to investigate the torque characteristics of self-ligating brackets compared with conventional brackets using various orthodontic wires.
2. Methods: Four types of 0.022 inch slot orthodontic brackets were tested: the self-ligating metallic bracket (Smartclip SL3), the conventional metallic bracket (Victory Series), the self-ligating ceramic bracket (Empower Clear), and the conventional ceramic bracket (20/40 TM Ceramic). Four types of 0.019´0.025 inch orthodontic wires were used: Stainless Steel wire (Ormco), Co-Cr-Ni alloy wire (Yellow Elgiloy), and b-Ti alloy wires (b-III Ti, TitanMoly). Two brackets of each type were bonded on the two maxillary central incisors of a dental resin model. The total length of the wire was 8.0 cm, and the inter-bracket distance was 5 mm. The wires were ligated with 0.120 inch elastomeric ligatures (Ormco) into the conventional brackets. For the self-ligating brackets, clips had been closed. Wire was twisted up to 90o in step of 1o with the step motor, and the torque expression was recorded using a computer. Ten measurements were performed for each bracket-wire combination.
3. Results: The Yellow Elgiloy wire exhibited the highest torque expression, followed by the Stainless Steel, TitanMoly, and b-III Ti wires, using either metallic or ceramic brackets (conventional and self-ligating). For the beta-titanium alloy wires, there were no significant differences in torque expressions with bracket types and materials up to 40o twisting. On the contrary, for the Stainless Steel and Yellow Elgiloy wires, the torque expressions were significantly higher for the self-ligating brackets than the conventional brackets (both for metallic and ceramic brackets). Moreover, there were no significant differences between the ceramic and metallic brackets (p>0.05). The torque expression curves were dominated by the characteristics of the wire alloy. The self-ligating brackets have higher torque expression than the conventional brackets, for both ceramic and metallic brackets. The results showed that the ligation type and material of the bracket has less influence on the torque expression for the beta-titanium alloy wires than the Stainless Steel and Yellow Elgiloy wires. More the wire is stiffer, more the difference in torque expression between the conventional and self-ligating bracket is big.
4. Conclusion
The torque expression curves are dominated by the characteristics of the wire alloy. The width of the bracket has no great influence on the torque control. The self-ligating brackets seem to have better torque control, compared with conventional brackets, for both ceramic and metallic brackets. The results showed that the type (material) and design of the bracket has less influence on the torque expression for the beta-titanium alloy wires than the Stainless Steel and Elgiloy wires.
Language
English
URI
https://hdl.handle.net/10371/130875
Files in This Item:
Appears in Collections:

Altmetrics

Item View & Download Count

  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Share