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J Korean Acad Pediatr Dent. 2008;35(2): 195-204.
A COMPARATIVE STUDY OF THE SHEAR BOND STRENGTH AND ADHESIVE FAILURE PATTERN OF METAL BRACKETS BONDED ON NATURAL TEETH AND PORCELAIN TEETH
Hyun-Sun Lee, Jong-Soo Kim,, Seung-Hoon Yoo
Dept. of Pediatric Dentistry, School of Dentistry, Dankook University
Corresponding Author: Jong-Soo Kim, ,Tel: 041-550-1931,2, Email: jskim@dku.edu
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ABSTRACT
Orthodontic brackets often need to be bonded to porcelain such as porcelain fused to metal crowns and porcelain jacket crowns. The purpose of this study was to evaluate the clinical usability of direct bonding system on porcelain teeth by measuring shear bond strength according to various conditions and observing adhesive failure patterns. The specimens, 20 maxillary premolars and 80 porcelain teeth that were produced by duplication of the labial surface of a maxillary first premolar were used and randomly divided into four groups of twenty teeth each. The 5 different preparation procedures tested: (1) application of 37% phosphoric acid on natural teeth, (2) sandblasting on porcelain surfaces, (3) sandblasting and application of 9.6% hydrofluoric acid on porcelain surfaces, (4) sandblasting and application of silane on porcelain surface, (5) sandblasting and application of 9.6% hydrofluoric acid and silane on porcelain surfaces. The metal brackets were bonded with Transbond® bonding material. The shear bond strength was tested by the micro universal testing machine(Kyung-Sung, Korea) and the amount of residual adhesive on the tooth surface after debonding was examined by stereoscope and assessed with an adhesive remnant index. The results of this study suggest that the direct bonding system on porcelain teeth with sandblasting, HF and porcelain primer is clinically useful.
Keywords: Shear bond strength | Porcelain teeth | Metal bracket | Hydrofluoric acid | Sandblasting
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