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A Comparative Evaluation of Internal Adaptation and Marginal Fitness of Two Zirconium Design Fabricated by CAD/CAM

*Loura S. Marqus, ** Nabeel S. Martani

*MSc student, College of Dentistry, Hawler Medical University, Erbil, Iraq.
**Department of Conservative Dentistry, College of Dentistry, Hawler Medical University, Erbil, Iraq.

Submitted: 25/11/2018; Accepted: 16/12/2018; Published 31/12/2018



Objective: Full anatomic zirconia crowns had been launched to overcome the problems associated with veneering porcelain. The aim of this study was to evaluate the internal and marginal adaptation of CAD/CAM milled zirconia core to full anatomic zirconia crown.

Methods:  The mandibular right first molar of a dentaform model was prepared for the full ceramic crown with deep shoulder finish line. The model was scanned using intra-oral scanner to produce ten full anatomic zirconia crowns and ten zirconia cores. The internal and marginal adaptations (that represents the cement analog) were evaluated using the replica technique with the aid of a stereomicroscope.

Results: All There was no statistically significant difference between the internal and marginal adaptation of core and full anatomic zirconia crown, while a significant difference exists between them at the occlusal point that was greater in full anatomic crown. Both groups revealed the mean gap width of 146.7 +- 18 which is significant when compared to the standard value.

Conclusions: Both zirconia core and crown revealed comparable results of marginal and internal adaptation after sintering without any effect of bulk thickness. The obtained results were greater than the acceptable range.


Keywords: Zirconia bulk, Internal adaptation, Marginal gap, Replica technique.    
                                                                                                                                                                                                                                                                                                                                                      Full Article - PDF


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