the Evaluation of Marginal Fitness of CAD/CAM Monolithic Zirconia Crowns Fabricated using Different Parameter of CBCT and laboratory Scanner
DOI:
https://doi.org/10.32828/mdj.v21i1.945Keywords:
Cone beam computed tomography CBCT, laboratory scanner, marginal fit, zirconia crownAbstract
Aim: to compare the marginal fitness of zirconia crowns made using laboratory scanners and various CBCT parameter settings.
Methods: An extracted premolar tooth was prepared for crown preparation criteria. The scanning of the prepared tooth using Medit T710 extraoral lab scanner (group A), and CBCT scans were made with (planmeca promax) CBCT at different setting parameters: (group B) with a field of view 80*50mm and 150um voxel size and (group C) with a field of view 50*50 mm and 75um voxel size. The 3D pictures from the CBCT scans and laboratory scanner were then imported into Exocad software, and a crown design was finished. The data was transmitted to CAM software, which was used to mill the crowns from CAD/CAM zirconia by a 5-axis milling machine. A stereo-microscope was used to assess the vertical marginal gap. A total of 120 points were measured throughout the three groups. Vertical marginal gap mean values were obtained by averaging the readings for each specimen. The data were analyzed using one-way ANOVA, and the Post hoc Tukey's test was performed to compare the significance of the difference between groups.
Result: There was no significant difference between the laboratory scanner (group A) and CBCT scan (group C) with (FOV) 50*50mm and 75um voxel size. However, there was a significant difference between the laboratory scanner and CBCT scan group with (FOV) 80*50mm and 150um voxel size (group B), and also between CBCT scan groups with different parameters.
Conclusion: Crowns made with the laboratory scanner exhibited smaller marginal gaps than crowns made using CBCT images with various settings parameters. All three groups were able to fabricate monolithic zirconia crowns with a marginal gap of less than 120um.
Keyword:
Cone beam computed tomography CBCT, laboratory scanner, marginal fit, zirconia crown.
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