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In vitro Shear Bond Strength of Orthodontic Brackets with Different Etching Techniques
M D Imran1, Arpita H Jariwala2, Vijayadhith Chinnappa3
1Senior Resident, Department of Dentistry, Patna Medical College and Hospital, Patna, Bihar, India.
Objective:
To evaluate and compare the shear bond strength of orthodontic brackets bonded to permanent teeth using three different etching techniques.
Materials And Methods:
30 extracted premolar teeth were divided and treated with various etching agents: Group I (11% hydrofluoric acid), Group II (5% maleic acid), and Group III (7% phosphoric acid). The surfaces were etched for 30 sec, primed with Trans bond XT adhesive, and bonded with metal brackets. An Instron Universal Testing Machine was used to measure the shear bond strength (SBS). Tukey post-hoc tests and one-way analysis of variance (ANOVA) were used to examine the data; P < 0.05 was considered statistically significant.
Results:
Our study found significant differences in SBS between the three etching agents. Group I (11% hydrofluoric acid) showed the highest SBS (10.52 MPa), followed by Group III (37% phosphoric acid) with 8.29 MPa, and Group II (5% maleic acid) with 6.70 MPa. The differences between the groups were statistically significant (P < 0.001).
Conclusion:
11% hydrofluoric acid is the most effective etching agent for orthodontic bonding, offering bond strengths within the clinically acceptable range.
