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Document Type

Original Study

Abstract

The present study was conducted to evaluate the effect of veneeringzirconia frameworks on the marginal and internal fit of zirconia based restorations.Materials and methods: Forty natural premolars were prepared to receive all-ceramiccrowns. The forty premolars were divided into two groups according to the type of restoration.Group (I) consisted of ten samples restored using monolithic zirconia crowns.Group (II) consisted of thirty samples restored using veneered zirconia frameworks.Group II was subdivided into three equal subgroups according to veneering technique.Subgroup (IIA) veneered using manual layering technique, Subgroup (IIB) veneeredusing Press-on technique and Subgroup (IIC) veneered using CAD-on technique. Allthe finished crowns were cemented to their corresponding abutments then each toothwas vertically sectioned bucco-lingually into 2 sections. Marginal, axial and occlusalgaps were measured at seven defined points on each section using digital microscope.Results: The significance level was set at Panalysis revealed that there was a significant difference between groups andsubgroups. The greatest mean value was recorded in subgroup IIA, veneered usingmanual layering technique. Whereas the lowest mean value was recorded in subgroupIIC, veneered using CAD-on technique. Regarding the internal gap statistical analysisrevealed that there was a significant difference. The greatest mean value was recordedin group I (monolithic), whereas the lowest mean value was recorded in subgroup IIC,veneered using CAD-on technique. Conclusion: Veneering zirconia frameworks usingthe CAD-on technique produces superior marginal and internal adaptation of zirconiabased restorations.

Keywords

CAD-on; monolithic; press-on; veneered; zircon

Subject Area

Restorative Dentistry Issue (Removable Prosthodontics, Fixed Prosthodontics, Endodontics, Dental Biomaterials, Operative Dentistry)

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