Evaluation of varied repair protocols applied to aged composite resin.
OBJECTIVE
This paper aims to examine varied surface treatments combined with adhesive bonding to ascertain the highest bond strength of the composite resin repair.


METHODS
A total of 100 specimens was made using an increment technique. The prepared specimens were aged for 20 days in 37 degrees +/- 20 degrees C water and then kept for 24 h at room temperature. The samples were separated into 5 groups of 20, and each group then received a different surface treatment (control group, phosphoric acid, diamond bur, air abrasion, silane primer combined with a diamond bur treatment). The effect of each surface treatment on the bond strength was determined by a shear bond test.


RESULTS
Specimens that received surface treatment with a diamond bur exhibited higher shear bond strengths than any of the other repaired groups (p < 0.05). Those treated with air abrasion had the second highest shear bond strengths, but without a statistically significant difference when compared to the control group (p > 0.05). Specimens treated with phosphoric acid showed virtually no difference compared to the specimens of the control group (p > 0.05).


CONCLUSIONS
Statistical analysis revealed that surface treatment with a diamond bur results in higher shear bond strength than other tested methods.
Bonstein
Tammy
T
Dept. of Restorative Dentistry, University of Manitoba, Winnipeg, Canada. T_Bonstein@umanitoba.ca
Garlapo
Davis
D
Donarummo
John
J
Bush
Peter J
PJ
D020906:Air Abrasion, Dental; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D017269:Dental Prosthesis Repair; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D018130:Diamond; D016014:Linear Models; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids; D019279:Resin Cements; D033081:Shear Strength; D012821:Silanes; D013499:Surface Properties; D016019:Survival Analysis; D013997:Time Factors
D003188:Composite Resins; C420130:Excite cement; D008689:Methacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; D012821:Silanes; C452226:tetric flow composite resin; D018130:Diamond; C030242:phosphoric acid