EFFECTS OF POTASSIUM NITRATE ON SHEAR BOND STRENGTH OF BRACKETS
Introduction: During 2010 the degree research “Effects of potassium nitrate on shear bond strength of brackets” was carried out at Universidad Cooperativa de Colombia in Bogota.
Objective: To determine whether the use of desensitizing with potassium nitrate affects the bond bracket strength to enamel.
Materials and Methods: Forty-five human premolar teeth were randomly allocated in three groups (n = 15 each). Group 1: control (not treated), Group 2: desensitizer treated and after 24-hour bracket bonding; Group 3: desensitizer treated and after 5-day bracket bonding. Gemini brackets and adhesive TransbondTMXT system were used. The shear bond strength was measured using Instron, a universal testing machine.
Results: Average sbs ± standard deviation for control Group was 7.9 ± 1.9 MPa; Group 2 (24 hour) was 4.9 ± 3.0 MPa; and Group 3 (5 day) was 7.2 ± 4.1 MPa. The effect of desensitizer on sbs after 24 hours (p = 0.0038) was significant but after 5 days there was a relevant recovering.
Conclusion: The sbs reduction was 37% in group 2 (24 hour) relative to the control. It is recommended to wait about 5 days for bonding brackets after using a desensitizer agent with potassium nitrate to avoid affecting sbs.
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