Effect of a fluoridated etchant on the shear bond strength of a composite resin to enamel

Journal Article

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International journal of paediatric dentistry / the British Paedodontic Society [and] the International Association of Dentistry for Children

Int.J.Paediatr.Dent.

Apr

LR: 20121115; JID: 9107511; 0 (Composite Resins); 0 (Fluorides, Topical); 0 (Phosphoric Acids); E4GA8884NN (phosphoric acid); ppublish

ENGLAND

0960-7439; 0960-7439

PMID: 1525128

eng

Clinical Trial; Journal Article; Randomized Controlled Trial; D

Unknown(0)

1525128

The purpose of this study was to evaluate the effect of a fluoridated etching gel on the shear bond strength of a composite resin to enamel. A total of 75 extracted human permanent molars were used. A flat enamel surface was obtained with 600-grit silicon carbide paper and cleaned with a rubber cup and a water slurry of fine flour of pumice. The teeth were randomly distributed into 5 groups of 15 teeth each and etched as follows: group 1: 37% non-fluoridated phosphoric acid gel (Coe) for 60 seconds (control); group 2: 60% phosphoric acid gel with 0.5% NaF (Orthoprep) for 5 seconds; group 3: Orthoprep for 15 seconds; group 4: Orthoprep for 30 seconds; group 5: Orthoprep for 60 seconds. After etching, rinsing and drying, an unfilled resin (Coe Bond) was thinly applied with a brush and cured for 30 seconds. A nylon ring was placed over the area and filled with a light-cured composite resin (Occlusin). The teeth were thermocyled (100x), mounted in plastic cups and plaster, and sheared with a knife-edged blade in an Instron machine running at a crosshead speed of 1 mm/min. The results in MPa were as follows: group 1: 14.49 +/- 4.43; group 2: 10.81 +/- 3.70; group 3: 13.51 +/- 3.21; group 4: 14.79 +/- 3.76; group 5: 15.47 +/- 4.07. An analysis of variance showed that the results in groups 1, 4 and 5 were not significantly different but that the bond strengths in groups 2 and 3 were significantly lower. Fracture within the enamel occurred in 8 specimens in group 1, 5 in group 2, 6 in group 3, 8 in group 4, and 13 in group 5. In the fluoridated etchant groups the number of specimens showing enamel fracture increased as the application time of the etchant increased.

Acid Etching, Dental, Composite Resins, Dental Bonding, Dental Enamel, Fluorides, Topical, Humans, Phosphoric Acids, Tensile Strength

Garcia-Godoy,F., Dodge,W. W., Donohue,M., O'Quinn,J. A.

Department of Pediatric Dentistry, University of Texas.

http://vp9py7xf3h.search.serialssolutions.com/?charset=utf-8&pmid=1525128

1992