J Adv Prosthodont.  2015 Aug;7(4):271-277. 10.4047/jap.2015.7.4.271.

Evaluation of marginal fit of 2 CAD-CAM anatomic contour zirconia crown systems and lithium disilicate glass-ceramic crown

• Ji MK
• Park JH
• Park SW
• Yun KD
• Oh GJ
• Lim HP

• KMID: 2118262
• DOI: http://doi.org/10.4047/jap.2015.7.4.271

Abstract

PURPOSE
This study was to evaluate the marginal fit of two CAD-CAM anatomic contour zirconia crown systems compared to lithium disilicate glass-ceramic crowns.
MATERIALS AND METHODS
Shoulder and deep chamfer margin were formed on each acrylic resin tooth model of a maxillary first premolar. Two CAD-CAM systems (Prettau(R)Zirconia and ZENOSTAR(R)ZR translucent) and lithium disilicate glass ceramic (IPS e.max(R)press) crowns were made (n=16). Each crown was bonded to stone dies with resin cement (Rely X Unicem). Marginal gap and absolute marginal discrepancy of crowns were measured using a light microscope equipped with a digital camera (Leica DFC295) magnified by a factor of 100. Two-way analysis of variance (ANOVA) and post-hoc Tukey's HSD test were conducted to analyze the significance of crown marginal fit regarding the finish line configuration and the fabrication system.
RESULTS
The mean marginal gap of lithium disilicate glass ceramic crowns (IPS e.max(R)press) was significantly lower than that of the CAD-CAM anatomic contour zirconia crown system (Prettau(R)Zirconia) (P<.05). Both fabrication systems and finish line configurations significantly influenced the absolute marginal discrepancy (P<.05).
CONCLUSION
The lithium disilicate glass ceramic crown (IPS e.max(R)press) had significantly smaller marginal gap than the CAD-CAM anatomic contour zirconia crown system (Prettau(R)Zirconia). In terms of absolute marginal discrepancy, the CAD-CAM anatomic contour zirconia crown system (ZENOSTAR(R)ZR translucent) had under-extended margin, whereas the CAD-CAM anatomic contour zirconia crown system (Prettau(R)Zirconia) and lithium disilicate glass ceramic crowns (IPS e.max(R)press) had overextended margins.

Keyword

Anatomic contour zirconia crown; CAD-CAM; Lithium disilicate glass ceramic crown; Marginal gap; Absolute marginal discrepancy; Marginal fit

MeSH Terms

Bicuspid
Ceramics
Computer-Aided Design*
Crowns*
Glass
Lithium*
Resin Cements
Shoulder
Tooth
Ceramics
Lithium
Resin Cements

Figure

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  Fig. 1 Photograpic view of the handpiece mounted milling machine.

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  Fig. 2 Proximal view of tooth preparation on the die and finish line configuration. (a) total occlusal convergence angle; (b) occlusal reduction; (c) margin width; (d) shoulder margin; (e) deep chamfer margin.

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  Fig. 3 Photograpic view of the three types of crown restoration: (A) Prettau®Zirconia; (B) ZENOSTAR®ZR translucent; (C) IPS e.max®press lithium disilicate glass ceramic.

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  Fig. 4 Schematic diagram of crown and tooth with the following measurement part: A, over-extended margin; and B, under-extended margin. (m): marginal gap; (a): absolute marginal discrepancy.

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