Details

Autor(en) / Beteiligte

• ERHARDT, MARIA CAROLINA GUILHERME
• CAVALCANTE, LARISSA MARIA ASSAD
• PIMENTA, LUIZ ANDRE FREIRE

Titel

Influence of Phosphoric Acid Pretreatment on Self-Etching Bond Strengths

Ist Teil von

• Journal of esthetic and restorative dentistry, 2004-01, Vol.16 (1), p.33-40

Ort / Verlag

Oxford, UK: Blackwell Publishing Ltd

Erscheinungsjahr

2004

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• ABSTRACT Purpose: The purpose of this investigation was to evaluate the influence of phosphoric acid pretreatment on shear bond strength of two self‐etching bonding systems to enamel and dentin. Materials and Methods: Forty‐eight extracted third human molar teeth were mounted, embedded into polystyrene resin, polished with 600‐grit aluminum oxide papers, and randomly divided into four groups (n= 12): group 1–Clearfil Liner Bond® 2V (Kuraray Co. Ltd., Osaka, Japan); group 2–One Up Bond F® (Tokuyama Corp., Tokyo, Japan); group 3–phosphoricacid (Condicionador Dental Gel®, Dentsply Ind. Com. LTDA, Rio de Janeiro, Brazil) and Clearfil Liner Bond 2V; group 4–phosphoric acid and One Up Bond F. In groups 3 and 4 the substrate was pre‐etched for 15 seconds with 37% phosphoric acid, rinsed, and dried with an air stream. In all groups adhesive systems were applied according to manufacturers' instructions and light cured; then a restorative composite resin (TPH Spectrum®, Dentsply Ind. Com. LTDA) was placed in a polytef matrix and cured. The specimens were stored in humidity for 7 days at 37°C. The shear bond strength test was performed in a universal test machine with a crosshead speed of 0.5 mm/min. All procedures were repeated for the dentin evaluation. Mean values were analyzed with two‐way analysis of variance and Duncan tests (p < .05). Results: The values obtained are listed in decreasing order: enamel–group 3 = 24.6 MPa, group 4 = 23.6 MPa, group 1 = 19.2 MPa, group 2 = 8.5 MPa; dentin–group 1 = 17.2 MPa, group 2 = 16.1 MPa, group 4 = 13.1 MPa, group 3 = 11.3 MPa. Conclusions: Under the conditions of this study, enamel etching with 37% phosphoric acid provided statistically significant higher shear bond strength values, regardless of the adhesive system. However, in dentin, for Clearfil Liner Bond 2V, phosphoric acid pretreatment negatively affected bond strength values.