Comparative evaluation of microtensile bond strength of different solvent based one step and two step adhesive systems to dentin. An in-vitro study

ABSTRACT Aim The aim of the present study was to investigate the effectiveness of the one total-etch self-priming adhesive, one two-step self-etching primer adhesive, and one ‘all-in-one’ selfetching adhesive system on the adhesion of a resin composite to enamel. Materials and methods Thirty-six freshly extracted human mandibular molars were selected for this study. A flat area about 5 mm in diameter was created on the exposed mesial surface of enamel of each tooth by moist grinding with 320, 420 and 600 grit silicon carbide paper. Twelve teeth were randomly assigned into three groups. In group 1, Adper Easy One (3M ESPE), a one step self-etching primer adhesive was applied and light curing unit for 10 seconds. In group 2, Adper SE Plus, a twostep self-etching primer with bottle A containing the aqueous primer and bottle B containing the acidic adhesive was applied and light cured for 10 seconds. Group 3 (control)—etchant 37% phosphoric acid is applied to the surface for 15 seconds and rinsed with water and air dried and adhesive (single bond 2) is applied to the surface and tube is placed and light cured for 20 seconds. Composite material (Z350) was placed in the tube and light cured for 40 seconds in all the groups. Bond strength testing was done using universal testing machine at the enamel-composite interface. The debonded enamel surface was evaluated in stereomicroscope to assess the cohesive, adhesive or mixed fracture. Data was statistically analyzed by one way analysis of variance (ANOVA). Results Group 1 performed least among all groups with a mean score of 19.46 MPa. Group 2 had a mean score of 25.67 MPa. Group 3 had a mean score of 27.16 MPa. Conclusion Under the conditions of this in vitro study, the bond strength values of the two-step self-etching primer systems tested were similar to the total-etch. And, one step self-etching primers have lower bond strength compared to the total-etch. How to cite this article Patil BS, Rao BKR, Sharathchandra SM, Hegde R, Kumar GV. Comparative Evaluation of Selfetching Primers and Phosphoric Acid Effectiveness on Composite to Enamel Bond: An in vitro Study. J Contemp Dent Pract 2013;14(5):790-795.

Download Full-text

Effect of Double-layer Application on Dentin Bond Durability of One-step Self-etch Adhesives

Operative Dentistry ◽

10.2341/13-168-l ◽

2014 ◽

Vol 39 (4) ◽

pp. 416-426 ◽

Cited By ~ 19

Author(s):

M Taschner ◽

M Kümmerling ◽

U Lohbauer ◽

L Breschi ◽

A Petschelt ◽

...

Keyword(s):

Bond Strength ◽

Double Layer ◽

Artificial Saliva ◽

In Vitro Study ◽

Adhesive Systems ◽

Microtensile Bond Strength ◽

Application Technique ◽

One Step ◽

Self Etch

SUMMARY Purpose The aim of this in vitro study was 1) to analyze the influence of a double-layer application technique of four one-step self-etch adhesive systems on dentin and 2) to determine its effect on the stability of the adhesive interfaces stored under different conditions. Materials and Methods Four different one-step self-etch adhesives were selected for the study (iBondSE, Clearfil S3 Bond, XenoV+, and Scotchbond Universal). Adhesives were applied according to manufacturers' instructions or with a double-layer application technique (without light curing of the first layer). After bonding, resin-dentin specimens were sectioned for microtensile bond strength testing in accordance with the nontrimming technique and divided into 3 subgroups of storage: a) 24 hours (immediate bond strength, T0), b) six months (T6) in artificial saliva at 37°C, or c) five hours in 10 % NaOCl at room temperature. After storage, specimens were stressed to failure. Fracture mode was assessed under a light microscope. Results At T0, iBond SE showed a significant increase in microtensile bond strength when the double-application technique was applied. All adhesive systems showed reduced bond strengths after six months of storage in artificial saliva and after storage in 10% NaOCl for five hours; however at T6, iBond SE, Clearfil S3 Bond, and XenoV+ showed significantly higher microtensile bond strength results for the double-application technique compared with the single-application technique. Scotchbond Universal showed no difference between single- or double-application, irrespective of the storage conditions. Conclusion The results of this study show that improvements in bond strength of one-step self-etch adhesives by using the double-application technique are adhesive dependent.

Download Full-text