Efficacy of using orthodontic adhesive resin in bonding and debonding characteristics of a calcium phosphate ceramic bracket

The aim of this study was to examine the shear bond strength between a new type of calcium phosphate ceramic bracket and human enamel using various types of adhesive resins after thermal cycling tests. Kurasper F, Light Bond, Super Bond C&B and Transbond XT were used as adhesive resins. A new Hyaline II bracket was bonded to human enamel using one of the above adhesive resins according to the manufacturer's instructions. Shear bond strengths were measured after immersion in water at 37 °C for 24 h, or after 2000 or 5000 cycles of thermal cycling between 5 °C and 55 °C. The Knoop hardness number (KHN) of Hyaline II and human enamel were measured. Significant differences in shear bond strength existed between Super Bond C&B and Transbond XT before thermal cycling. Four different adhesive resins produced significant differences in shear bond strength after thermal cycling compared with bond strength before thermal cycling. Four adhesive resins provided the clear formation of resin tags. The adhesive remnant indices were not significantly different among four adhesive resins. There are no significant difference in KHN at Hyaline II and human enamel. In conclusion, Hyaline II has an advantage for reducing the risk of enamel fracture or enamel crack without the loss of appropriate bond strength.