J Adv Prosthodont.  2014 Feb;6(1):39-45. 10.4047/jap.2014.6.1.39.

Three-dimensional accuracy of different correction methods for cast implant bars

• Kwon JY
• Kim CW
• Lim YJ
• Kwon HB
• Kim MJ

• KMID: 2176569
• DOI: http://doi.org/10.4047/jap.2014.6.1.39

Abstract

PURPOSE
The aim of the present study was to evaluate the accuracy of three techniques for correction of cast implant bars.
MATERIALS AND METHODS
Thirty cast implant bars were fabricated on a metal master model. All cast implant bars were sectioned at 5 mm from the left gold cylinder using a disk of 0.3 mm thickness, and then each group of ten specimens was corrected by gas-air torch soldering, laser welding, and additional casting technique. Three dimensional evaluation including horizontal, vertical, and twisting measurements was based on measurement and comparison of (1) gap distances of the right abutment replica-gold cylinder interface at buccal, distal, lingual side, (2) changes of bar length, and (3) axis angle changes of the right gold cylinders at the step of the post-correction measurements on the three groups with a contact and non-contact coordinate measuring machine. One-way analysis of variance (ANOVA) and paired t-test were performed at the significance level of 5%.
RESULTS
Gap distances of the cast implant bars after correction procedure showed no statistically significant difference among groups. Changes in bar length between pre-casting and post-correction measurement were statistically significance among groups. Axis angle changes of the right gold cylinders were not statistically significance among groups.
CONCLUSION
There was no statistical significance among three techniques in horizontal, vertical and axial errors. But, gas-air torch soldering technique showed the most consistent and accurate trend in the correction of implant bar error. However, Laser welding technique, showed a large mean and standard deviation in vertical and twisting measurement and might be technique-sensitive method.

Keyword

Cast implant bar; Gas-air torch soldering; Laser welding; Additional casting; Accuracy; Axis angle

MeSH Terms

Axis, Cervical Vertebra
Welding

Figure

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  Fig. 1 Metal master model with two standard abutment replicas.

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  Fig. 2 Transfer jig adapted to the metal master model. The transfer jig divided into two pieces bucco-lingually was used to reduce the horizontal error occurring from machining tolerance of a gold cylinder as same method with our previous study.

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  Fig. 3 Two-point laser welding for the specimens of group 3 (laser welding group) before additional soldering reinforcement. Two-point laser welding vertically directed to buccal and lingual side fused the opposing edges.

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  Fig. 4 Rolling and pitching movement. Axis angle consists of rolling angle and pitching angle, and rolling and pitching movement turn on its X, Y axis, respectively. Plus value means movement toward head of arrow.

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  Fig. 5 Gap distances of the specimen at the postcasting (Step 2) and postcorrection measurement (Step 3) using the noncontact profile measurement machine. Four region of interest (4 squares) were captured with CCD camera at the each side, followed by measuring of interface in × 160 magnification image and finding an average of the gap distances.

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  Fig. 6 Changes of bar length from step 1 to step 3. Graph shows mean and standard deviation. There was a statistically significant difference between Group 1 and Group 2, 3 and no significant difference between Group 2 and Group 3.

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