The influence of retention hole and adhesive systems on the shear bond strengths of resin composite to amalgam

Tuncer S., Demirci M., Tiryaki M., UYSAL Ö.

JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, cilt.28, sa.19, ss.1980-1989, 2014 (SCI-Expanded) identifier identifier

Özet

The aim of the study is to evaluate the influence of surface-treatment methods with and without the use of a retention hole on the shear bond strength of a resin composite adhered to amalgam using an adhesive system. Amalgam specimens were divided into six groups. Group 1 (Bur) specimens were roughened with a diamond bur, Group 2 (Al2O3) specimens were sandblasted with a 50 m aluminum oxide powder, Group 3 (CoJet (R)) specimens were sandblasted with 30 mu m CoJet (R) Sand, Group 4 (Bur + Rh) specimen surfaces were prepared with a retention hole 1 mm in diameter and 1 mm deep and roughened with a diamond bur, Group 5 (Al2O3 + Rh) specimens were also prepared with a retention hole and sandblasted with 50 mu m aluminum oxide powder, and Group 6 (CoJet (R) + Rh) surfaces were prepared with a retention hole and sandblasted with 30 mu m CoJet (R) Sand. Resin composite cylinders were bonded onto the amalgam surfaces using Xeno (R) IV, Optibond (TM) All-In-One, Clearfil (TM) SE Bond, Adper (TM) Single Bond Plus, and Scotchbond (TM) Multi-Purpose adhesive systems. In addition, silane (Monobond S) was used for Groups 5 and 6. The shear bond was determined and statistically analyzed using two-way analysis of variance and post hoc Tukey's tests (p <= 0.05). The surface treatment significantly affected the shear bond strengths of the adhesive systems. The shear bond strengths of Optibond (TM) All-In-One (2.661 +/- 0.48 MPa) in Group 1 and Scotchbond Multi-Purpose (3.818 +/- 0.98) in Group 4 were significantly higher than those of the other adhesive systems. Silica coating of the amalgam surface significantly improved the shear bond strength of the resin composites. The addition of a retention hole on the amalgam affects the bonding strength of the composite adhesion.

THE INFLUENCE OF RETENTION GROOVE AND

ADHESIVE SYSTEM ON THE BOND STRENGTH OF RESIN

COMPOSITE TO AMALGAM

Safa Tuncer1, Mustafa Demirci2, Murat Tiryaki1

1 DDS, PhD, Istanbul University, Faculty of Dentistry, Department of

Operative Dentistry

2 DDS, PhD, Professor, Istanbul University, Faculty of Dentistry,

Department of Operative Dentistry

Objective: This study evaluated the influences of surface conditioning

methods with or without retention groove on shear bond strength to

amalgam, using commercially available adhesive systems.

Methods: Amalgam specimens were randomly divided into one of the

following conditioning groups. Group 1: Surface was roughened with a

diamond bur. Group 2: Surfaces were sandblasted with 50 μm aluminum

oxide powder. Group 3: Retention groove of 1 mm diameter and 1 mm

width prepared with a diamond bur by using a cavity preparing apparatus,

then surface roughening with a diamond bur. Group 4: Retention groove

prepared, then sandblasted with 50 μm aluminum oxide powder. Resin

composite (Filtek Ultimate) cylinders were bonded onto the amalgam

surfaces using the Optibond All-In-One (Optibond AIO), Clearfil SE

Bond and Scotchbond Multi-Purpose (Scotchbond MP) adhesive systems.

Specimens were stored in water at 37 °C for five weeks. Shear bond testing

was performed with a universal testing machine. Stereomicroscope examination

was carried out to determine the bond failure sites. The results were

analyzed by two-way ANOVA and Tukey’s tests (p≤0.05).

Results: Surface conditioning significantly affected the shear bond

strengths of adhesive systems. In Group 1, the shear bond strength of

Optibond was significantly higher AIO (2.661±0.480 Mpa) than the

other adhesive systems. In Group 3, Scotchbond MP (3.818±

0.985 MPa) increased the bond strength significantly compared to

Optibond AIO (2.731±0.471 MPa). In Group 4 Scotchbond MP

(3.794±0.787) showed the highest bond strenght, however no significant

differences were noted between the adhesive systems. The shear

bond strenght results of the adhesive systems in Group 4 were significantly

higher than results of Group1 and Group 2

Conclusion: Surface conditioning methods affected the bond strengths of

adhesion of composite to amalgam. Preparation of retention groove by

repair or veneering of amalgam restorations improves the bond strengths.