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

Ji, Min-Kyung; Park, Ji-Hee; Park, Sang-Won; Yun, Kwi-Dug; Oh, Gye-Jeong; Lim, Hyun-Pil

doi: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 원문보기

The journal of advanced prosthodontics, v.7 no.4, 2015년, pp.271 - 277

Ji, Min-Kyung (Department of Prosthodontics, School of Dentistry, Chonnam National University) , Park, Ji-Hee (Department of Prosthodontics, School of Dentistry, Chonnam National University) , Park, Sang-Won (Department of Prosthodontics, School of Dentistry, Chonnam National University) , Yun, Kwi-Dug (Department of Prosthodontics, School of Dentistry, Chonnam National University) , Oh, Gye-Jeong (RIS Foundation for Advanced Biomaterials, Chonnam National University) , Lim, Hyun-Pil (Department of Prosthodontics, School of Dentistry, Chonnam National University)

Abstract ▼ AI-Helper

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.

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문제 정의

Although computer-controlled technique is used in producing dental restoration in order to improve the accuracy during the manufacturing process, not enough studies have been conducted on the marginal fit of anatomic contour zirconia crowns fabricated using CAD/CAM system. Therefore, the objective of this study was to compare the marginal fit of anatomic contour zirconia crown to that of lithium disilicate glass ceramic crown regarding the finish line configuration and fabrication systems.

제안 방법

Acrylic resin tooth was used in this study to simulate clinical situation. Tooth preparation was conducted uniformly using surveyor milling machine.
This study examined the marginal fit of two CAD/CAM anatomic contour zirconia crowns (Prettau®Zirconia of ZikozahnandZENOSTAR®ZR translucent of Wieland Dental) and lithium disilicate glass ceramic crowns (IPS e. max®press of IvoclarVivadent) which are widely used clinically.
Two CAD/CAM system (Prettau®Zirconia; Zirkonzahn GmbH; Gais, Italy/ ZENOSTAR®ZR translucent; Wieland Dental GmbH, Pforzheim, Germany) zirconia crowns and IPS e.max®press (IvoclarVivadent AG, Schaan, Liechtenstein) lithium disilicate glass ceramic crowns were divided into three groups according to fabrication methods (n=16).

데이터처리

Two-way analysis of variance (ANOVA) and post-hoc Tukey’s HSD test were conducted to analyze significance of crown marginal fit regarding the finish line configuration and the fabrication system.

성능/효과

According to Tukey honestly significant difference (HSD) test results, the marginal gap of IPS e.max®press was significantly smaller than Prettau®Zirconia (P<.05).
The results of this study suggest that IPS e.max®press is better than Prettau®Zirconia regarding the marginal gap when fabricating an anatomic contour crown.
Tukey honestly significant difference (HSD) test indicated a significant difference between IPS e.max®press and ZENOSTAR®ZR translucent, and also between Prettau® Zirconia and ZENOSTAR®ZR translucent (P<.05).

후속연구

max^®press is better than Prettau^®Zirconia regarding the marginal gap when fabricating an anatomic contour crown. Further study and clinical applications should be performed to compensate for the shrinkage of zirconia that might happen during the fabricating procedure. The development of CAD/CAM technology is needed to produce more accurate milling process.

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

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

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