Abstract
Fibreglass reinforced brackets (FGBs) and ceramic brackets were bonded to the enamel of extracted premolars to evaluate their shear bond strength and fracture mode. One-hundred extracted premolars were divided into five groups, and combinations of two-paste and no-mix composite, and plastic bracket conditioner were used in the test groups. Bond strength testing was carried out 24 hours after direct bonding. The shear strength of ceramic brackets with a two-paste composite was significantly higher than FGBs bonded with either two-mix or no-mix composite ( P < 0.05). Ceramic brackets bonded with two-mix and no-mix composite demonstrated a 30 and a 10 percent enamel fracture rate, respectively. There were no enamel or bracket fractures in any of the FGB groups.
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