J Adv Prosthodont.  2011 Sep;3(3):166-171. 10.4047/jap.2011.3.3.166.

Evaluation of shear bond strengths of gingiva-colored composite resin to porcelain, metal and zirconia substrates

Affiliations
  • 1Seoul Grace Dental Clinic, Seoul, Korea.
  • 2Department of Prosthodontics, School of Medicine, Ewha Womans University, Seoul, Korea. prosth@ewha.ac.kr

Abstract

PURPOSE
The purpose of this study is to evaluate and compare the shear bond strength of the gingiva-colored composite resin and the tooth-colored composite resin to porcelain, metal and zirconia.
MATERIALS AND METHODS
Sixty cylindrical specimens were fabricated and divided into the following 6 groups (Group 1-W: tooth-colored composite bonded to porcelain, Group 1-P: gingiva-colored composite bonded to porcelain, Group 2-W: tooth-colored composite bonded to base metal, Group 2-P: gingiva-colored composite bonded to base metal, Group 3-W: toothcolored composite bonded to zirconia, Group 3-P: gingiva-colored composite bonded to zirconia). The shear bond strength was measured with a universal testing machine after thermocycling and the failure mode was noted. All data were analyzed using the two-way analysis of variance test and the Bonferroni post-hoc test at a significance level of 0.05.
RESULTS
The mean shear bond strength values in MPa were 12.39, 13.42, 8.78, 7.98, 4.64 and 3.74 for Group 1-W, 1-P, 2-W, 2-P, 3-W and 3-P, respectively. The difference between the two kinds of composite resin was not significant. The shear bond strength of Group 1 was the highest and that of Group 3 was the lowest. The differences among Group 1, 2 and 3 were all significant (P<.05).
CONCLUSION
The shear bond strength of the gingiva-colored composite was not less than that of the tooth-colored composite. Thus, repairing or fabricating ceramic restorations using the gingiva-colored composite resin can be regarded as a practical method. Especially, the prognosis would be fine when applied on porcelain surfaces.

Keyword

Gingiva-colored composite resin; Shear bond strength; Ceramic repair

MeSH Terms

Ceramics
Collodion
Dental Porcelain
Prognosis
Zirconium
Ceramics
Collodion
Dental Porcelain
Zirconium

Figure

  • Fig. 1 Prepared specimens prior to measurement of shear bond strength. A: white resin bonded to porcelain (Group 1-W), B: white resin bonded to metal (Group 2-W), C: white resin bonded to zirconia (Group 3-W), D: pink resin bonded to porcelain (Group 1-P), E: pink resin bonded to metal (Group 2-P), F: pink resin bonded zirconia (Group 3-P).

  • Fig. 2 Means and standard deviations of shear bond strengths (MPa) and results of Bonferroni post-hoc test. Vertical lines represent the standard deviations. *statistically significant P<.05

  • Fig. 3 Failure mode of specimens. A: cohesive failure of feldspathic porcelain, B: adhesive failure in a base metal specimen, C: adhesive failure in a zirconia specimen.


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