Marginal and Internal Fit of Monolithic and Veneered Zirconia Crowns | ||||
| Al-Azhar Dental Journal for Girls | ||||
| Article 10, Volume 6, Issue 2, April 2019, Page 187-194 PDF (828.48 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/adjg.2019.42140 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Mai I. Mohammed1; Mona H Mandour2; Rania A. Shetawey3 | ||||
| 1Dentist at the Ministry of Health. | ||||
| 2Professor of Crowns and Bridges, Faculty of Dental Medicine for Girls, Al-Azhar University | ||||
| 3Assistant Professor of Crowns and Bridges, Faculty of Dental Medicine for Girls, Al-Azhar University | ||||
| Abstract | ||||
| The present study was conducted to evaluate the effect of veneering zirconia frameworks on the marginal and internal fit of zirconia based restorations. Materials and methods: Forty natural premolars were prepared to receive all-ceramic crowns. 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) veneered using Press-on technique and Subgroup (IIC) veneered using CAD-on technique. All the finished crowns were cemented to their corresponding abutments then each tooth was vertically sectioned bucco-lingually into 2 sections. Marginal, axial and occlusal gaps 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 and subgroups. The greatest mean value was recorded in subgroup IIA, veneered using manual layering technique. Whereas the lowest mean value was recorded in subgroup IIC, veneered using CAD-on technique. Regarding the internal gap statistical analysis revealed that there was a significant difference. The greatest mean value was recorded in group I (monolithic), whereas the lowest mean value was recorded in subgroup IIC, veneered using CAD-on technique. Conclusion: Veneering zirconia frameworks using the CAD-on technique produces superior marginal and internal adaptation of zirconia based restorations. | ||||
| Keywords | ||||
| CAD-on; monolithic; press-on; veneered; zircon | ||||
|
Statistics Article View: 250 PDF Download: 426 |
||||
