The Effect of 3% Phosphate Ascorbyl Gel on Bond Strength of Composite Resin to Enamel treated with 35% Hydrogen Peroxide.

Autor:	de Castro Mde F; Department of Dentistry, Federal University of Maranhão São Luís, Maranhão, Brazil., Silva AC; Department of Dentistry, Federal University of Maranhão São Luís, Maranhão, Brazil., Franco MM; Department of Dentistry, Federal University of Maranhão São Luís, Maranhão, Brazil., Silva AP; Department of Dentistry, Federal University of Maranhão São Luís, Maranhão, Brazil., Bramante Fda S; Deparment of Dentistry, CEUMA University, São Luís Maranhão, Brazil., da Silva MB; Deparment of Dentistry, CEUMA University, São Luís Maranhão, Brazil., Lima DM; Adjunctive Professor, Department of Dentistry, Universidade Federal do Maranhão, Av. Portugueses s/n, Campus Universitário Bacanga, 65085-580, São Luís, Maranhão, Brazil, Phone: 55 98 3272-8577, e-mail: darlonmartins@yahoo.com.br., Pereira Ade F; Department of Dentistry, Federal University of Maranhão São Luís, Maranhão, Brazil.
Jazyk:	angličtina
Zdroj:	The journal of contemporary dental practice [J Contemp Dent Pract] 2015 May 01; Vol. 16 (5), pp. 376-82. Date of Electronic Publication: 2015 May 01.
DOI:	10.5005/jp-journals-10024-1693
Abstrakt:	Objective: To evaluate the effect of 3% phosphate ascorbyl gel (PA) in different times onto the microshear bond strength of composite resin (CR) to bovine enamel treated with 35% hydrogen peroxide (HP). Materials and Methods: Thirty enamel blocks of bovine incisors were made and divided into 5 groups (n = 6) with three specimens per group (n = 18), according to treatment: G1= No bleaching + CR; G2 = HP + CR after 15d; G3 = HP + CR after 24 hours; G4 = HP + PA (15 min) + CR after 24 hours; G5 = HP + PA (2 hours) + CR after 24 hours. The resin cylinders were made by Tygon matrices. Microshear bond strength test was performed using universal testing machine with a 50N load at a speed of 0.5 mm/min. Fracture modes were assessed by a stereomicroscope 40 ×. Microshear bond strength values were submitted to the analysis of variance (ANOVA) one-way and Tukey test (p < 0.05). Results: G1 had significant results when compared to G3 and G5 (p < 0.01). However, G2, G3, G4 and G5 have showed no significant differences among groups (p > 0.05). Failure modes were categorized into adhesive (90%) and mixed (10%). Conclusion: The use of 3% phosphate ascorbyl gel for 15 minutes was able to improve bond strength of composite resin to bleached bovine enamel, but when 3% phosphate ascorbyl gel was applied during 40 minutes it negatively interfered in the adhesion of the resin to bleached bovine enamel.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu