J Korean Acad Prosthodont.  2012 Apr;50(2):85-91. 10.4047/jkap.2012.50.2.85.

Effect of various casting alloys and abutment composition on the marginal accuracy of bar-type retainer

• Lee YH
• Song YG
• Lee JS

• KMID: 2195494
• DOI: http://doi.org/10.4047/jkap.2012.50.2.85

Abstract

PURPOSE
The object of this study was to determine if the low-priced alloy and metal UCLA abutment could be available for manufacturing bar-retained framework of implant prosthesis.
MATERIALS AND METHODS
Bar structure was classified into 4 groups, The specimen of group 1 and 2 were based on casting high noble metal alloys and noble metal alloys with gold UCLA abutment. The specimen of group 3 and 4 were based on casting noble metal alloys and base metal alloys with metal UCLA abutment. Cast bar structure was installed in an acrylic resin model and only the screw on the hexed abutment side was tightened to 20 Ncm. On the opposite side, vertical discrepancy was measured with stereo microscope from front, back, and lateral side of the implant-abutment interface. One-way ANOVA was performed to analyze the marginal fit discrepancy.
RESULTS
One-way ANOVA test showed significant differences among all groups (P<.05) except for Group 1 and 3. Among them, difference between Group 1 and 2 was noticeable. Measured vertical discrepancies were all below 70 microm except to Group 2.
CONCLUSION
Base metal alloy and metal UCLA abutment could be used as an alternative to high-priced gold alloy for implant bar-retained framework.

Keyword

Metal UCLA abutment; Bar attachment; Marginal adaptation; Base metal alloy

MeSH Terms

Alloys
Alloys

Figure

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  Fig. 1 A: Gap measurement points on resin model, B: Marginal gap analysis (a: vertical gap).

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  Fig. 2 Microscopic features of specimen in group 2.

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  Fig. 3 The bar graph of mean vertical discrepancies among the groups.

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