J Adv Prosthodont.  2016 Oct;8(5):404-410. 10.4047/jap.2016.8.5.404.

Effect of GLUMA desensitizer on the retention of full metal crowns cemented with Rely X U200 self-adhesive cement

Affiliations
  • 1Prosthodontics Department. Islamic Azad University-Dental Branch, Teheran, Iran.
  • 2Oral Medicine Department. Islamic Azad University-Dental Branch, Teheran, Iran. drarashazizi@yahoo.com

Abstract

PURPOSE
Considering the importance of retention in the success and long-term clinical service of fixed partial dentures (FPDs) as well as the existing controversy regarding the effect of GLUMA desensitizer on the retention of full metal crowns cemented with RelyX U200 self-adhesive cement, this study aimed to assess the effect of GLUMA desensitizer on the retention of full metal crowns cemented using RelyX U200.
MATERIALS AND METHODS
In this experimental study, 20 sound human premolars were prepared; a 0.5 mm chamfer finish line was prepared above the cementoenamel junction. The teeth were randomly assigned to two groups: a desensitizer group (n = 10, treated with GLUMA desensitizer) and a control (n = 10, no surface treatment). Full metal crowns were fabricated of base metal alloy and had a ring. All crowns were cemented with RelyX U200 and subjected to retention test by using a universal testing machine. The data were analyzed using SPSS version 20 and independent t-test.
RESULTS
The mean tensile bond strength was significantly higher in the GLUMA desensitizer group (230.63 ± 63.8 N) compared to the control group (164.45 ± 39.3 N) (P≤.012).
CONCLUSION
GLUMA desensitizer increases the tensile bond strength of RelyX U200 self-adhesive cement to dentin.

Keyword

Gluma desensitizer; Retention; Crowns; Self-adhesive cement

MeSH Terms

Alloys
Bicuspid
Crowns*
Dentin
Denture, Partial, Fixed
Humans
Tooth
Tooth Cervix
Alloys

Figure

  • Fig. 1 Tooth preparation using a milling machine. The teeth were mounted on dental stone molds for this purpose.

  • Fig. 2 Wax pattern. A ring was placed on the occlusal surface, sprued, and casted. This ring was used for attachment to the jig of the universal testing machine for tensile strength testing.

  • Fig. 3 Constant application of 5 kg axial load to each crown for 10 minutes by the universal testing machine.

  • Fig. 4 Load was applied until the crown was completely separated from the tooth.

  • Fig. 5 Load application parallel to the longitudinal axis of the tooth at a crosshead speed of 0.5 mm/min.

  • Fig. 6 Cohesive failure: Cement remained mainly on the prepared tooth surfaces and hardly on the crown.

  • Fig. 7 Mixed failure: Cement remained on both the crown and tooth surfaces.

  • Fig. 8 Adhesive failure: Cement remained mainly on the crown.


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