Year : 2015 | Volume
: 4 | Issue : 1 | Page : 19--25
In vitro assessment of competency for different lingual brackets in sliding mechanics
S Lalithapriya, N Kurunji Kumaran, K Rajasigamani
Department of Orthodontics and Dentofacial Orthopaedics, Rajah Muthiah Dental College Hospital, Annamalai University, Chidambaram, Cudallore, Tamil Nadu, India
Aim: To determine the static frictional resistance of different lingual brackets at different second order angulations when coupled with stainless steel (SS) archwire in dry and wet conditions.
Materials and Methods: Using a modified jig, frictional resistance was evaluated under different conditions for a total of 270 upper premolar lingual brackets (0.018″ × 0.025″ - conventional - 7 th generation and STb, self-ligating - evolution) with no in-built tip or torque together with 0.016″ × 0.022″ straight length SS archwires. For conventional brackets, the archwire was secured with 0.008″ preformed SS short ligature ties.
Statistical Analysis: One way analysis of variance with Tukey HSD as post-hoc test was applied for degree wise and bracket wise comparison within dry condition and wet condition. For pair wise comparison Student«SQ»s t-test was used.
Results: Under both conditions the static frictional resistance is significantly higher for self-ligating brackets at 0°, while at 5° and 10° it is higher for 7 th generation brackets. Statistically, significant difference does not exist at 0° between conventional brackets and the same was found at 5° and 10° between STb and self-ligating brackets. With an increase in second order angulations, all the evaluated samples exhibited an increased frictional value. Wet condition samples obtained a higher value than their corresponding dry condition.
Conclusion: The self-ligating bracket evaluated in this in vitro study is not beneficial in reducing friction during en-mass retraction due to its interactive clip type.
N Kurunji Kumaran
Department of Orthodontics and Dentofacial Orthopaedics, Rajah Muthiah Dental College Hospital, Annamalai University, Annamalai Nagar, Chidambaram, Cudallore - 608 002, Tamil Nadu
|How to cite this article:|
Lalithapriya S, Kumaran N K, Rajasigamani K. In vitro assessment of competency for different lingual brackets in sliding mechanics.J Orthodont Sci 2015;4:19-25
|How to cite this URL:|
Lalithapriya S, Kumaran N K, Rajasigamani K. In vitro assessment of competency for different lingual brackets in sliding mechanics. J Orthodont Sci [serial online] 2015 [cited 2020 Sep 19 ];4:19-25
Available from: http://www.jorthodsci.org/article.asp?issn=2278-0203;year=2015;volume=4;issue=1;spage=19;epage=25;aulast=Lalithapriya;type=0