J Adv Prosthodont.  2014 Aug;6(4):253-258. 10.4047/jap.2014.6.4.253.

Gap comparison between single crown and three-unit bridge zirconia substructures

• Anunmana C
• Charoenchitt M
• Asvanund C

• KMID: 1974843
• DOI: http://doi.org/10.4047/jap.2014.6.4.253

Abstract

PURPOSE
To compare marginal and internal gaps of zirconia substructure of single crowns with those of three-unit fixed dental prostheses.
MATERIALS AND METHODS
Standardized Co-Cr alloy simulated second premolar and second molar abutments were fabricated and subsequently duplicated into type-III dental stone for working casts. After that, all zirconia substructures were made using Lava(TM) system. Marginal and internal gaps were measured in 2 planes (mesial-distal plane and buccal-palatal plane) at 5 locations: marginal opening (MO), chamfer area (CA), axial wall (AW), cusp tip (CT) and mid-occlusal (OA) using Replica technique.
RESULTS
There were significant differences between gaps at all locations. The mean +/- SD of marginal gap in premolar was 43.6 +/- 0.4 microm and 46.5 +/- 0.5 microm for single crown and 3-unit bridge substructure respectively. For molar substructure the mean +/- SD of marginal gap was 48.5 +/- 0.4 microm and 52.6 +/- 0.4 microm for single crown and 3-unit bridge respectively. The largest gaps were found at the occlusal area, which was 150.5 +/- 0.5 microm and 154.5 +/- 0.4 microm for single and 3-unit bridge premolar substructures respectively and 146.5 +/- 0.4 microm and 211.5 +/- 0.4 microm for single and 3-unit bridge molar substructure respectively.
CONCLUSION
Independent-samples t-test showed significant differences of gap in zirconia substructure between single crowns and three-unit bridge (P<.001). Therefore, the span length has the effect on the fit of zirconia substructure that is fabricated using CAD/CAM technique especially at the occlusal area.

Keyword

CAD/CAM; Ceramics; Zirconia; Marginal fit; 3-unit bridge

MeSH Terms

Alloys
Bicuspid
Ceramics
Crowns*
Dental Prosthesis
Molar
Replica Techniques
Alloys
Ceramics

Figure

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  Fig. 1 Standardized Co-Cr model fabrication.

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  Fig. 2 The replica technique using silicone material for determining fit of zirconia substructure.

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  Fig. 3 Positions for marginal and internal gaps measurement.

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  Fig. 4 Measurement positions of marginal and internal gaps between substructures and master dies.

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  Fig. 5 Mean of gaps of single crown and 3-unit bridge in 2 planes (P = premolar; M = molar).

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  Fig. 6 Occlusal gap value compared between single crown and 3-unit bridge.

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