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J Dent (Shiraz). 2015 Mar;16(1 Suppl):15-20.

Resistance to Sliding in Clear and Metallic Damon 3 and Conventional Edgewise Brackets: an In vitro Study.

Author information

1
Dept. of Orthodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamedan, Iran;
2
Dept. of Mechanical Engineering, School of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran;

Abstract

STATEMENT OF THE PROBLEM:

Frictional forces are considered as important counterforce to orthodontic tooth movement. It is claimed that self-ligating brackets reduce the frictional forces.

PURPOSE:

The aim of this study was to compare the resistance to sliding in metallic and clear Damon brackets with the conventional brackets in a wet condition.

MATERIALS AND METHOD:

The samples included 4 types of brackets; metallic and clear Damon brackets and metallic and clear conventional brackets (10 brackets in each group). In this study, stainless steel wires sized 0.019×0.025 were employed and the operator's saliva was used to simulate the conditions of oral cavity. The tidy-modified design was used for simulation of sliding movement. The resistance to sliding and static frictional forces was measured by employing Testometric machine and load cell.

RESULTS:

The mean (±SD) of resistance to sliding was 194.88 (±26.65) and 226.62 (±39.9) g in the esthetic and metallic Damon brackets, while these values were 187.81(±27.84) and 191.17(±66.68) g for the clear and metallic conventional brackets, respectively. Static frictional forces were 206.4(±42.45) and 210.38(±15.89) g in the esthetic and metallic Damon brackets and 220.63(±49.29) and 215.13(±62.38) g in the clear and metallic conventional brackets. According to two-way ANOVA, no significant difference was observed between the two bracket materials (clear and metal) and the two types of bracket (self-ligating versus conventional) regarding resistance to sliding (p= 0.17 and p= 0.23, respectively) and static frictional forces (p= 0.55 and p= 0.96, respectively).

CONCLUSION:

Neither the type of bracket materials nor their type of ligation made difference in resistance to sliding and static friction.

KEYWORDS:

Friction; Self-ligating Brackets; Sliding Technique

PMID:
26106630
PMCID:
PMC4476125

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