الفهرس 
NTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This invitro study was conductedto evaluate and compare different techniques for debonding of ceramic brackets in terms of shear bond strength and adhesive remnant index. A sample of 100 extracted human premolars were randomly allocated into 5 equal groups. Ceramic brackets were bonded to the teeth using light cure composite resin. Among the 5 groups; group I: served as a control, group II: chemical aided debonding via peppermint oil, group III: ultrasonic aided debonding, group IV: diode laser aided debonding, and group V: Er:YAG laser aided debonding. Thereafter, brackets were shear tested using a universal testing machine. After debonding of brackets, adhesive remnant index was measured using stereomicroscope. Statistical analysis was undertaken to compare between the five groups. Results showed a statistically significant reduction of shear bond strength in ultrasonic, diode, and Er:YAG laser aided debonding. Yet,no statistically significant difference was found with chemical aided debonding. A Statistically significant higher adhesive remnant index scores was found solely in Er:YAG laser aided debonding. However, no significant difference was detected with either chemical, ultrasonic, and diode laser aided debonding.