All ETDs from UAB

Advisory Committee Chair

Daniel A Givan

Advisory Committee Members

Amjad Javed

Keith Kinderknecht

Nathaniel Lawson

Perng-Ru Liu

Document Type

Thesis

Date of Award

2017

Degree Name by School

Master of Dentistry (MDent) School of Dentistry

Abstract

Purpose: To investigate the effect of acrylic processing on push-out strength of Ti copings luted to Milled Ti frameworks using differing resin cements. Materials and Methods: The experimental design consisted of three groups of 30 specimens each. Three different luting cements were utilized (One for each group), Panavia V5 Dual Cure Kuraray, Multilink Dual Cure Hybrid Ivoclar-Vivadent, and RelyX Unicem-2 self-adhesive 3M. The experimental model consists of trans-mucosal Titanium Coping, Abutment analog, Milled Ti hollow cylinder (9.0mm-OD) represents the milled Ti bar. The Abutment copings were luted to milled-Ti cylinders using the 3 dental cements and an alignment jig to assure repeatability used during cementation. Waxing then acrylic processed by two protocols (Fast and Conventional) for two groups (not the control) were completed. Processed specimens were finished, polished, and stored in distilled H2O at 24°C for 24 hours prior to testing. Push-out strengths were measured (N/mm2), with Instron 5565 mechanical testing system, crosshead speed 1 mm/min. Failure mode was evaluated by high-magnification light microscopy and SEM. Significance determined by ANOVA and Tukey’s post hoc test (p<0.05). Results: Two-way ANOVA shows no significant interaction (p= 0.45 > 0.05) between the two variables, processing technique and the cement. Only the cement is significantly different. So, the cement is not affected by the process and vise-versa. One-way ANOVA shows no significant differences in push-out strength within the same cement groups. However, it has found a difference among the groups (P<0.0001). Tukey’s post hoc test found significant differences among the cements groups (p<0.05). Conclusion: Within the limitations of this in-vitro study, no differences in cement push-out strength were found between acrylic processing methods, but differed by cement type.

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