Evaluation of marginal fit of 2 CAD-CAM anatomic contour zirconia crown systems and lithium disilicate glass-ceramic crown.
OBJECTIVE
This study was to evaluate the marginal fit of two CAD-CAM anatomic contour zirconia crown systems compared to lithium disilicate glass-ceramic crowns.


METHODS
Shoulder and deep chamfer margin were formed on each acrylic resin tooth model of a maxillary first premolar. Two CAD-CAM systems (Prettau®Zirconia and ZENOSTAR®ZR translucent) and lithium disilicate glass ceramic (IPS e.max®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®press) was significantly lower than that of the CAD-CAM anatomic contour zirconia crown system (Prettau®Zirconia) (P<.05). Both fabrication systems and finish line configurations significantly influenced the absolute marginal discrepancy (P<.05).


CONCLUSIONS
The lithium disilicate glass ceramic crown (IPS e.max®press) had significantly smaller marginal gap than the CAD-CAM anatomic contour zirconia crown system (Prettau®Zirconia). In terms of absolute marginal discrepancy, the CAD-CAM anatomic contour zirconia crown system (ZENOSTAR®ZR translucent) had under-extended margin, whereas the CAD-CAM anatomic contour zirconia crown system (Prettau®Zirconia) and lithium disilicate glass ceramic crowns (IPS e.max®press) had overextended margins.
Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
Min-Kyung
MK
Ji
Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
Ji-Hee
JH
Park
Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea. ; RIS Foundation for Advanced Biomaterials, Chonnam National University, Gwangju, Republic of Korea.
Sang-Won
SW
Park
Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
Kwi-Dug
KD
Yun
RIS Foundation for Advanced Biomaterials, Chonnam National University, Gwangju, Republic of Korea.
Gye-Jeong
GJ
Oh
Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju, Republic of Korea.
Hyun-Pil
HP
Lim
Absolute marginal discrepancy; Anatomic contour zirconia crown; CAD-CAM; Lithium disilicate glass ceramic crown; Marginal fit; Marginal gap