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

Yun-Hui Lee; Young-Gyun Song; Joon-Seok Lee

doi:10.4047/jkap.2012.50.2.85

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

Original Article

The Journal of Korean Academy of Prosthodontics

The Journal of Korean Academy of Prosthodontics 2012; 50(2): 85-91.

Published online: 30 April 2012

DOI: https://doi.org/10.4047/jkap.2012.50.2.85

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

Yun-Hui Lee, DDS, MSD, Young-Gyun Song, DDS, MSD, Joon-Seok Lee, DDS, MSD, PhD

Department of Prosthodontics, School of Dentistry, Dankook University, Cheonan, Korea.

Corresponding Author: Joon-Seok Lee. Department of Prosthodontics, College of Dentistry, Dankook University, 7-1, Shinbu-dong, Cheonan, 330-716, Korea. +82 41 550 1865: joon322@dku.edu

Received 27 October 2011 Revised 3 January 2012 Accepted 13 February 2012

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 µm 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.

Keywords: Metal UCLA abutment, Bar attachment, Marginal adaptation, Base metal alloy

Figures and Tables

Fig. 1

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

Fig. 2

Microscopic features of specimen in group 2.

Fig. 3

The bar graph of mean vertical discrepancies among the groups.

Table 1

Casting alloys used in this study

Table 2

Mechanical properties of the casting alloys

Table 3

UCLA abutments used in this study

Table 4

Classification of experimental groups and number of specimens

Table 5

Results of Scheffe's test according to groups

☆ denotes significant difference at level 0.05 with Scheffe's test.

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