J Korean Acad Prosthodont.  2013 Oct;51(4):276-283. 10.4047/jkap.2013.51.4.276.

A comparative study on the fit and screw joint stability of ready-made abutment and CAD-CAM custom-made abutment

• Kim JW
• Heo YR
• Kim HJ
• Chung CH

• KMID: 2000151
• DOI: http://doi.org/10.4047/jkap.2013.51.4.276

Abstract

PURPOSE
The purpose of this study was to investigate the fit and screw joint stability between Ready-made abutment and CAD-CAM custom-made abutment.
MATERIALS AND METHODS
Osstem implant system was used. Ready-made abutment (Transfer abutment, Osstem Implant Co. Ltd, Busan, Korea), CAD-CAM custom-made abutment (CustomFit abutment, Osstem Implant Co. Ltd, Busan, Korea) and domestically manufactured CAD-CAM custom-made abutment (Myplant, Raphabio Co., Seoul, Korea) were fabricated five each and screws were provided by each company. Fixture and abutments were tightening with 30Ncm according to the manufacturer's instruction and then preloding reverse torque values were measured 3 times repeatedly. Kruskal-Wallis test was used for statistical analysis of the preloading reverse torque values (alpha=.05). After specimens were embedded into epoxy resin, wet cutting and polishing was performed and FE-SEM imaging was performed, on the contact interface.
RESULTS
The pre-loading reverse torque values were 26.0 +/- 0.30 Ncm (ready-made abutment; Transfer abutment) and 26.3 +/- 0.32 Ncm (CAD-CAM custom-made abutment; CustomFit abutment) and 24.7 +/- 0.67 Ncm (CAD-CAM custom-made abutment; Myplant). The domestically manufactured CAD-CAM custom-made abutment (Myplant abutment) presented lower pre-loading reverse torque value with statistically significant difference than that of the ready-made abutment (Transfer abutment) and CAD-CAM custom-made abutment (CustomFit abutment) manufactured from the same company (P=.027) and showed marginal gap in the fixture-abutment interface.
CONCLUSION
Within the limitation of the present in-vitro study, in domestically manufactured CAD-CAM custom-made abutment (Myplant abutment) showed lower screw joint stability and fitness between fixture and abutment.

Keyword

CAD-CAM custom-made abutment; Pre-loading reverse torque value; Screw joint stability; Fit

MeSH Terms

Computer-Aided Design*
Torque

Figure

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  Fig. 1. Internal type implant fixture (GS III, Osstem Implant Co. Ltd, Busan, Korea).

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  Fig. 2. Abutments used in this study. A: Ready-made abutment (Transfer abutment, Osstem Implant Co. Ltd, Busan, Korea), B: CAD-CAM custom-made abutment (CustomFit abutment, Osstem Implant Co. Ltd, Busan, Korea), C: CAD-CAM custom-made abutment (Myplant abutment, Raphabio Co., Seoul, Korea).

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  Fig. 3. Screws used in this study. A: Ready-made screw (Ebony gold, Osstem Implant Co. Ltd, Busan, Korea), B: CAD-CAM custom-made screw (Titanium, Raphabio Co., Seoul, Korea).

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  Fig. 4. A: Prosthetic motor screw driver, B: Digital torque wrench.

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  Fig. 5. Ground and polished specimen.

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  Fig. 6. FE-SEM (×150) images of fixture-abutment interface in each group. A: Ready-made abutment (Transfer abutment), B: CAD-CAM custom-made abutment (CustomFit abutment), C: CAD-CAM custom-made abutment (Myplant abutment).

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  Fig. 7. FE-SEM (×150) images of abutment-screw interface in each group. A: Ready-made abutment (Transfer abutment), B: CAD-CAM custom-made abutment (CustomFit abutment), C. CAD-CAM custom-made abutment (Myplant abutment).

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  Fig. 8. FE-SEM (×30) images of fixture-screw interface in each group. A: Ready-made abutment (Transfer abutment), B: CAD-CAM custom-made abutment (CustomFit abutment), C: CAD-CAM custom-made abutment (Myplant abutment).

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