Direct bonding to porcelain.
Orthodontic brackets were bonded to 180 faces of 45 porcelain cubes that were divided into three groups according to their surface preparation. In group I, the glaze had been removed with a sandpaper disk, whereas in group II, it was maintained. A solution of acidulated phosphate fluoride (APF) gel was applied to the samples in groups I and II for 5 minutes after pumicing. In group III, the glaze had been removed with a coarse diamond bur. Each group was further divided into four subgroups, depending on whether a priming agent had been used, and the type of composite used to bond the brackets. Shear force was used to debond the brackets, and the results showed that the APF solution was unable to provide enough retention on porcelain surface to bond brackets. Mechanical retention, obtained with a coarse diamond bur, was necessary to increase bond strength, which can be further improved by chemical bonding, with a silane priming agent. Therefore bonding to porcelain is clinically possible and is an acceptable procedure in orthodontic treatment.
State University of Rio de Janeiro, Brazil.
V L
VL
Barbosa
M A
MA
Almeida
O
O
Chevitarese
O
O
Keith
D000149:Acidulated Phosphate Fluoride; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins; D001840:Dental Bonding; D003738:Dental Cements; D017005:Dental Debonding; D003775:Dental Polishing; D003776:Dental Porcelain; D017220:Dentin-Bonding Agents; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements; D012821:Silanes; D017640:Silicates; D013499:Surface Properties; D013718:Tensile Strength
D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012821:Silanes; D017640:Silicates; D003776:Dental Porcelain; D000149:Acidulated Phosphate Fluoride; D017438:Bisphenol A-Glycidyl Methacrylate; C067318:P10 dental resin; C041330:Scotchbond; C005144:pumice