Shear Bond Strength of Ceramic Brackets with Different Base Designs: An in-vitro Study

Abstract

Ceramic brackets were introduced in 1987 as a more esthetically pleasing alternative to stainless steel brackets. 1 Two types of ceramic brackets are available according to their distinct differences during fabrication, they are: polycrystalline and monocrystalline (single-crystal) aluminas. 2,3 Both polycrystalline and monocrystalline ceramic brackets possess various base designs such as grooves, beads, or round pits for the purpose of mechanical interlocking between the brackets and the teeth. 4 As bracket bases do not chemically bond to enamel or resin, efforts are made to improve mechanical retention using various designs. ABSTRACTObjective: To evaluate the influence of bracket base designs on shear bond strength of ceramic brackets bonded to natural teeth and to determine the common site of bond failure. Materials & Method:120 therapeutically extracted maxillary first premolars were divided into six groups of 20 samples each and were mounted in resin blocks. Each sample was bonded with bracket of that particular group and subjected to thermocycling. The shear bond strength was measured using Universal Testing Machine. After debonding, the teeth and brackets were examined under stereo-microscope for adhesive remnant index. Result: Ceramic brackets with ball base design (Group MATERIALS AND METHODThe study was conducted in the Department of Orthodontics, ITS-CDSR, Muradnagar, Ghaziabad and ITS EngineeringCollege, Noida. The study was conducted on 120 extracted human maxillary first premolars. All teeth used in the study were extracted therapeutically for orthodontic treatment and were stored in 0.1% thymol solution. The teeth were washed, debrided and then stored in distilled water to prevent dehydration and bacterial growth. The teeth were cleansed and then polished with non-flouridated pumice and rubber prophylactic cup for 10 seconds.

In Vitro Comparison of Shear Bond Strength Between Clarity Bracket and Transcend Ceramic Bracket

“…The result of the present research are in agreement with Olsen, Chaudhary, and Bakhadher who found that entire bonding material remained on tooth surface. [11][12][13] Multiple factors can influence bond strength scores, namely, geometric form of bracket base, nature of composite used, condition of the enamel surface, 14 and adhesive forces. 15,16 Further research is recommended to determine the debonding character of clarity brackets when removed with instruments designed especially for this purpose.…”