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The Effects of In-office Reconditioning on the Morphology of Slots and Bases of Stainless Steel Brackets and on the Shear/Peel Bond Strength

P.O. Box 22490, Riyadh 11426, Kingdom of Saudia Arabia

Abstract

Objectives: To compare the effect of five in-office bracket reconditioning methods on: (i) bracket slot width and interwing gap measurements; (ii) the appearance of the bracket bases under scanning electron microscope (SEM), and; (iii) shear/peel bond strength (SPBS).

Setting: Ex vivo study.

Method: One hundred and twenty-five brackets were initially bonded and were divided into five experimental groups and reconditioning by the following methods: (i) adhesive grinding using green stone (Gp II); (ii) sandblasting (Gp III); (iii) direct flaming (Gp IV); (iv) using the BigJane machine (Gp V), and; (v) application of Buchman method (Gp VI).

Outcomes: Distortion of the brackets. Scanning electron miscropy of three representative specimens from each group. The remaining brackets were rebonded, then shear/peel forces to failure were measured (SPBS).

Results: The ANOVA and multiple comparison test exhibited a statistical, but not clinical, significant increase in the bracket measurements of Group VI. There was a significant reduction (28%) in the SPBS of Group II. Under the SEM, the wire mesh structure was maintained; however, the amount of adhesive remnants greatly varied among the groups.

Conclusions: Although none of the in-office reconditioning methods employed adversely affected the bracket base and/or the bracket measurements, reconditioning with a green stone was not effective. Sandblasting method and direct flaming are recommended because of simplicity and time-saving advantages.

Key words: Bracket Base, Bracket Recycling, Bracket Slot, In-office Reconditioning, Stainless Steel Brackets.

Notes

E-mail: aisha_basudan{at}yahoo.com