Abstract

ISMAIL, M  and  SHAIKH, A. Bond strength of metal orthodontic brackets to all ceramic crowns. S. Afr. dent. j. [online]. 2018, vol.73, n.4, pp.212-215. ISSN 0375-1562.

INTRODUCTION: The demand for orthodontic treatment in adult patients has increased considerably, in many cases requiring orthodontists to place attachments onto ceramic restorations. AIM: This study evaluated, in-vitro, the shear bond strength (SBS) of metal orthodontic brackets to all- ceramic crowns. METHOD: 40 IPS eMax crowns and 40 porcelain-veneered zirconia crowns were manufactured. Group 1: n=20 crowns and Group 2: n=20 crowns were thermocycled. Groups 3 and 4: n=40 crowns, were not exposed to thermal changes. The facial surfaces of all crowns (n=80) were etched by the application of 35 % ortho-phosphoric acid liquid for 2 minutes, followed by the application of a thin layer of a ceramic primer. After bonding, all samples were stored in distilled water for 24 hours before debonding. Data were analysed using side by side Box-and-Whisker plots, the Kruskal-Wallis test (p < 0.05) and the Bonferroni Test. RESULTS: Group 3: mean SBS 5.1 MPa (45.5 Newtons) to 5.8 MPa (51.9 Newtons). Group 4: mean SBS 6.4 MPa (57.3 Newtons) to 8.1 MPa (72.7 Newtons). ARI values further highlighted the negative influence of thermocycling. CONCLUSION: There was no significant difference in the shear bond strengths of RelyXTM Unicem 2 and TransbondTM XT bonded to all-ceramic crowns.

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