MARGINAL ACCURACY OF ULTRA-TRANSLUCENT ZIRCONIA AND MACHINABLE COMPOSITE LAMINATE VENEERS VERSUS LITHIUM DISILICATE VENEERS USING TWO MILLING PROTOCOLS

Document Type : Original Article

Authors

1 Department of Fixed Prosthodontics, Faculty of Dentistry, Ahram Canadian University

2 Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University

3 Department of Fixed Prosthodontics, Faculty of Dentistry, Cairo University, Egypt

Abstract

Aim: to investigate effect of two milling protocols on the marginal accuracy of delicate thin margins of laminate veneers fabricated from different aesthetic materials.
Materials and Methods: a typodont maxillary central incisor was prepared with butt-joint incisal preparation and 0.4mm chamfer finish line to receive 36 laminate veneers constructed from (L) Lithium disilicate (IPS e.max CAD), (Z) Ultra-translucent zirconia (UTML KATANA), and (C) Machinable composite (Brilliant Crios) (n=12). Each group was subdivided into 2 subgroups according to milling protocol fast and normal. Each laminate veneer margins were measured under stereomicroscope. Three points were Measured for each surface (mesial, distal, incisal and cervical). Each measurement was repeated three times then mean values were calculated. Data was analyzed statistically using One-Way Anova, post hoc test and Paired t-test.
Results: normal milling protocol, showed statistically significant difference between materials (P-value=0.01*). Ultra-translucent zirconia showed the lowest mean marginal gap. Regarding fast milling protocol, there was statistical significant difference between materials with (P-value= 0.012*). Machinable composite showed the lowest mean marginal gap. Finally, there was no statistically significant difference between fast and normal milling protocols except for with machinable composite.
Conclusion: Ultra-translucent zirconia and machinable composite can be considered as a great revolution in laminate veneers fabrication, also as substitutes for lithium disilicate. Ultra-translucent zirconia laminates exhibited the lowest marginal gaps in normal milling while, machinable composite exhibited the lowest marginal gaps in fast milling protocol. Also, Fast milling can substitute normal milling protocol.

Keywords

Main Subjects

Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2257-2267

Files

Share

How to cite

Statistics