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KMID : 0361920140440010044
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Korean Journal of Orthodontics
2014 Volume.44 No. 1 p.44 ~ p.49
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Effects of ultrasonic instrumentation with different scaler-tip angulations on the shear bond strength and bond failure mode of metallic orthodontic brackets
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Bonetti Giulio Alessandri
Parenti Serena Incerti
Ippolito Daniela Rita
Gatto Maria Rosaria
Checchi Luigi
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Abstract
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Objective: To evaluate the effects of ultrasonic instrumentation with different scaler-tip angulations on the shear bond strength (SBS) and bond failure mode of metallic orthodontic brackets.
Methods: Adhesive pre-coated metallic brackets were bonded to 72 extracted human premolars embedded in autopolymerizing acrylic resin. The teeth were randomly divided into 3 groups (n = 24 each) to undergo no treatment (control group) or ultrasonic instrumentation with a scaler-tip angulation of 45o (45o-angulation group) or 0o (0o-angulation group). SBS was tested in a universal testing machine,and adhesive remnant index (ARI) scores were recorded. The Kruskal-Wallis test and Mann-Whitney U-test were used for statistical analysis.
Results: The control group had a significantly higher mean SBS value than the treated groups, which showed no significant differences in their mean SBS values. The ARI scores were not significantly different among the groups.
Conclusions: Ultrasonic instrumentation around the bracket base reduces the SBS of metallic orthodontic brackets, emphasizing the need for caution during professional oral hygiene procedures in orthodontic patients. The scaler-tip angulation does not influence the SBS reduction and bond failure mode of such brackets.
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KEYWORD
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Bracket, Bonding, Oral hygiene, Ultrasonics
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