Purpose: Ceramic self-ligating brackets were developed recently, however, only few comparative studies had been reported about their bond strengths and friction. The aim of the study was to compare shear bond strengths and friction forces of various self-ligating ceramic brackets. Materials and methods: The present study is divided into two parts. In shear bond strength test, bovine teeth were used as a substitute for human teeth. Five groups of brackets (three ceramic self-ligating brackets including ClippyC, GeniusCrystal, DamonClear2, ClarityAdvanced (conventional ceramic bracket), Damon3MX (metal self-ligating bracket), were used and debonded with 12 brackets in each group. The shear bond strengths and adhesive remnant index (ARI) scores were compared. In the friction test, several parameters were investigated, including five kinds of bracket, two wire sizes (0.014" Cu-NiTi and 0.016" × 0.022" NiTi) and three angulations (0°, 5°, and 10°). Each bracket/wire/angulation combination was tested five times in 30 settings. A total of 150 runs were performed.
Results: DamonClear2 had highest bond strength among the 5 brackets with significant differences found. ClarityAdvanced and DamonClear2 had highest and lowest ARI scores, respectively. In friction behavior test, ClarityAdvanced had largest frictional force, but there was no significant difference in frictional force for 0.016" × 0.022" NiTi with an angulation of 10°. There was no significant difference in friction force between angulations of 0° and 5°, but there was a significant difference between angulations of 5° and 10° for the same brackets except ClarityAdvanced. Conclusion: DamonClear2 had highest bond strength and ClarityAdvanced had a larger frictional force than those of self-ligating brackets, except for 0.016" × 0.022" NiTi with an angulation of 10°.
Wu, Chia-Lin; Chang, Chen-Jung; Lee, Tzer-Min; Lo, Jen-Bang; and Liu, Jia-Kuang
"Comparison of Shear Bond Strengths and Fiction Forces Among Various Self-ligating Ceramic Brackets,"
Taiwanese Journal of Orthodontics: Vol. 32
, Article 1.
Available at: https://www.tjo.org.tw/tjo/vol32/iss4/1
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