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Shear bond strength of two chemically different denture base polymers to reline materials.

Authors :
Ahmad F
Dent M
Yunus N
Source :
Journal of prosthodontics : official journal of the American College of Prosthodontists [J Prosthodont] 2009 Oct; Vol. 18 (7), pp. 596-602. Date of Electronic Publication: 2009 Jun 08.
Publication Year :
2009

Abstract

Purpose: This study evaluated the shear bond strengths of light-polymerized urethane dimethacrylate (Eclipse) and heat-polymerized polymethylmethacrylate (Meliodent) denture base polymers to intraoral and laboratory-processed reline materials.<br />Materials and Methods: Thirty disks measuring 15 mm diameter and 2 mm thick were prepared for each denture base material following the manufacturers' recommendation. They were relined with Meliodent RR, Kooliner, and Secure reline materials after 1 month of water immersion. Ten additional Eclipse specimens were relined using the same Eclipse resin. A shear bond test was carried out on an Instron machine at a crosshead speed of 1.0 mm/min 24 hours after relining. Data were analyzed using two-way and one-way ANOVAs and post hoc Dunnett's T3 test (p= 0.05). The nature of failure was analyzed under a stereomicroscope. The effect of dichloromethane adhesive on the two denture polymer surfaces and the failed interfaces of mixed and adhesive failures were analyzed under a SEM (scanning electron microscope).<br />Results: Two-way ANOVA showed significant differences in the shear bond strength values as a function of the denture base polymers, reline materials, and their interaction (p < 0.05). One-way ANOVA showed significant differences in shear bond strength values among denture base-reline combinations (p < 0.05) except for Meliodent-Kooliner and Eclipse-Meliodent RR relines. Meliodent showed the highest shear bond strength value when relined with Meliodent RR (14.5 +/- 0.5 MPa), and Eclipse showed the highest value with Eclipse relining (11.4 +/- 0.6 MPa). Meliodent denture base showed adhesive, cohesive, and mixed failure, while all Eclipse showed adhesive failure with various reline materials.<br />Conclusion: The two chemically different denture base polymers showed different shear bond strength values to corresponding reline materials.

Details

Language :
English
ISSN :
1532-849X
Volume :
18
Issue :
7
Database :
MEDLINE
Journal :
Journal of prosthodontics : official journal of the American College of Prosthodontists
Publication Type :
Academic Journal
Accession number :
19515166
Full Text :
https://doi.org/10.1111/j.1532-849X.2009.00481.x