Assessment of Vertical Marginal Gap of Nano-lithium Disilicate Occlusal Veneers Using Two Preparation Designs and Two Different Fabrication Techniques after Thermocycling. (In Vitro Study)

Document Type : Original Article

Authors

1 conservative and esthetics department, MSA university, Cairo, Giza

2 fixed prosthodontics department, MSA university, Cairo, Giza

Abstract

Abstract
Purpose: Assessment of the vertical marginal gap of Nano-Lithium Disilicate occlusal veneers using two different fabrication techniques after thermocycling.
Materials and Methods: One maxillary first premolar of typodont acrylics samples was selected for standardized preparation of occlusal veneers. Samples were scanned using an extra-oral scanner and prepared to receive occlusal veneers using Exocad software following standard preparation guidelines for ceramic occlusal veneers. Biogeneric copy was done for all samples. Samples were divided into two groups according to fabrication of Nano lithium Disilicate (Group I) pressing technique (n= 14), and (Group II) milling technique (n=14). 1mm thicknesses chamfer finish line design with proximal extension preparation. All designs were done by using a digital software program. Samples were cemented using self-adhesive resin cement, and thermocycling was done (10,000 cycle), followed by measurement of the vertical gap using stereomicroscope (X35) and image software analysis, with 14 measurement points taken per specimen.
Results: One-way ANOVA showed Group (I) pressed veneers (20.40±1.94) (µm) had a lower marginal gap than Group (II) milled veneers (23.66±5.74) (µm), yet the difference was not statistically significant (p=0.095). Pressing technique showed non-significant superior results than milling regarding marginal adaptation.
Conclusions:
Marginal adaptation of all occlusal veneers with different fabrication techniques used in this study showed clinical acceptance results within clinical acceptance range ˂ 120 µm. Occlusal veneers fabricated with CAD/CAM and pressing technology showed clinically comparable vertical margin adaptation.

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