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An in vitro investigation of a comparison of bond strengths of composite to etched and air-abraded human enamel surfaces.
J Prosthodont. 2006 Jan-Feb; 15(1):2-8.JP

Abstract

PURPOSE

The purposes of the study were to measure the tensile bond strength of composite resin to human enamel specimens that had been either etched or air-abraded, and to compare the quality of the marginal seal, through the assessment of microleakage, of composite resin to human enamel specimens that had been either etched or air-abraded.

MATERIALS AND METHODS

Thirty mandibular molar teeth were decoronated and sectioned mesio-distally to produce six groups, each containing ten specimens that were embedded in acrylic resin using a jig. In each of the four treatment groups, the specimen surfaces were treated by either abrasion with 27 or 50 microm alumina at 4 mm or 20 mm distance, and a composite resin was bonded to the treated surfaces in a standardized manner. In the two control groups the specimens were treated with 15 seconds exposure to 36% phosphoric acid gel and then similarly treated before being stored in sterile water for 1 week. All specimens were then subjected to tensile bond strength testing at either 1 or 5 mm/min crosshead speed. For the microleakage study, the degree of dye penetration was measured 32 times for each treatment group, using a neutral methylene blue dye at the interface between composite and either 27 or 50 microm air-abraded tooth structure or etched enamel surfaces.

RESULTS

The mean bond strength values recorded for Group 1 (phosphoric acid etch, 5 mm/min crosshead speed) was 25.4 MPa; Group 2 (phosphoric acid etch, 1 mm/min), 22.2 MPa; Group 3 (27 microm alumina at 4 mm distance), 16.8 MPa; Group 4 (50 microm alumina at 4 mm distance), 16.9 MPa; Group 5 (27 microm alumina at 20 mm distance), 4.2 MPa; and for Group 6 (50 microm alumina at 20 mm distance) 3.4 MPa. An analysis of variance (ANOVA) demonstrated significant differences among the groups, and a multiple comparison test (Tukey) demonstrated that conventionally etched specimens had a greater bond strength than air-abraded specimen groups. No significant difference in dye penetration could be demonstrated among the groups (p= 0.58).

CONCLUSIONS

Composite resin applied to enamel surfaces prepared using an acid etch procedure exhibited higher bond strengths than those prepared with air abrasion technology. The abrasion particle size did not affect the bond strength produced, but the latter was adversely affected by the distance of the air abrasion nozzle from the enamel surface. The crosshead speed of the bond testing apparatus had no effect on the bond strengths recorded. The marginal seal of composite to prepared enamel was unaffected by the method of enamel preparation.

Authors+Show Affiliations

Division of Restorative Dentistry, Bristol Dental School, Lower Maudlin Street, Bristol BS1 2LY, UK.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

16433645

Citation

Gray, G B., et al. "An in Vitro Investigation of a Comparison of Bond Strengths of Composite to Etched and Air-abraded Human Enamel Surfaces." Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, vol. 15, no. 1, 2006, pp. 2-8.
Gray GB, Carey GP, Jagger DC. An in vitro investigation of a comparison of bond strengths of composite to etched and air-abraded human enamel surfaces. J Prosthodont. 2006;15(1):2-8.
Gray, G. B., Carey, G. P., & Jagger, D. C. (2006). An in vitro investigation of a comparison of bond strengths of composite to etched and air-abraded human enamel surfaces. Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, 15(1), 2-8.
Gray GB, Carey GP, Jagger DC. An in Vitro Investigation of a Comparison of Bond Strengths of Composite to Etched and Air-abraded Human Enamel Surfaces. J Prosthodont. 2006 Jan-Feb;15(1):2-8. PubMed PMID: 16433645.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An in vitro investigation of a comparison of bond strengths of composite to etched and air-abraded human enamel surfaces. AU - Gray,G B, AU - Carey,G P D, AU - Jagger,D C, PY - 2006/1/26/pubmed PY - 2006/5/4/medline PY - 2006/1/26/entrez SP - 2 EP - 8 JF - Journal of prosthodontics : official journal of the American College of Prosthodontists JO - J Prosthodont VL - 15 IS - 1 N2 - PURPOSE: The purposes of the study were to measure the tensile bond strength of composite resin to human enamel specimens that had been either etched or air-abraded, and to compare the quality of the marginal seal, through the assessment of microleakage, of composite resin to human enamel specimens that had been either etched or air-abraded. MATERIALS AND METHODS: Thirty mandibular molar teeth were decoronated and sectioned mesio-distally to produce six groups, each containing ten specimens that were embedded in acrylic resin using a jig. In each of the four treatment groups, the specimen surfaces were treated by either abrasion with 27 or 50 microm alumina at 4 mm or 20 mm distance, and a composite resin was bonded to the treated surfaces in a standardized manner. In the two control groups the specimens were treated with 15 seconds exposure to 36% phosphoric acid gel and then similarly treated before being stored in sterile water for 1 week. All specimens were then subjected to tensile bond strength testing at either 1 or 5 mm/min crosshead speed. For the microleakage study, the degree of dye penetration was measured 32 times for each treatment group, using a neutral methylene blue dye at the interface between composite and either 27 or 50 microm air-abraded tooth structure or etched enamel surfaces. RESULTS: The mean bond strength values recorded for Group 1 (phosphoric acid etch, 5 mm/min crosshead speed) was 25.4 MPa; Group 2 (phosphoric acid etch, 1 mm/min), 22.2 MPa; Group 3 (27 microm alumina at 4 mm distance), 16.8 MPa; Group 4 (50 microm alumina at 4 mm distance), 16.9 MPa; Group 5 (27 microm alumina at 20 mm distance), 4.2 MPa; and for Group 6 (50 microm alumina at 20 mm distance) 3.4 MPa. An analysis of variance (ANOVA) demonstrated significant differences among the groups, and a multiple comparison test (Tukey) demonstrated that conventionally etched specimens had a greater bond strength than air-abraded specimen groups. No significant difference in dye penetration could be demonstrated among the groups (p= 0.58). CONCLUSIONS: Composite resin applied to enamel surfaces prepared using an acid etch procedure exhibited higher bond strengths than those prepared with air abrasion technology. The abrasion particle size did not affect the bond strength produced, but the latter was adversely affected by the distance of the air abrasion nozzle from the enamel surface. The crosshead speed of the bond testing apparatus had no effect on the bond strengths recorded. The marginal seal of composite to prepared enamel was unaffected by the method of enamel preparation. SN - 1059-941X UR - https://www.unboundmedicine.com/medline/citation/16433645/An_in_vitro_investigation_of_a_comparison_of_bond_strengths_of_composite_to_etched_and_air_abraded_human_enamel_surfaces_ L2 - https://doi.org/10.1111/j.1532-849X.2006.00062.x DB - PRIME DP - Unbound Medicine ER -