Influence of cervical finish line type on marginal adaptation of two different all-ceramic CAD/CAM systems before and after veneering ceramic over the Zirconia copings: An in vitro study
Journal Title: IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) - Year 2018, Vol 17, Issue 6
Abstract
The margins of fixed restoration should be closely adapted to the cavosurface finish line to survive in the harsh biological environment of the oral cavity. This invitro study was designed to evaluate and compare the influence of two different cervical finish line types (shoulder & radial shoulder) on the marginal adaptation of two different all-ceramic CAD/CAM systems (Cerec 3& Lava) before and after veneering ceramic over the Zirconia copings. Two nickel-chromium metal dies were fabricated which replicates all-ceramic crown preparations with two different finish line configurations i.e. shoulder & radial shoulder one each. A total of 28 Y-TZP (zirconia) coping samples were fabricated using Cerec 3 & Lava CAD/CAM systems (14 each). Out of 14 zirconia coping samples in each system, seven were fabricated with shoulder and remaining seven with radial shoulder margin. All coping were evaluated for absolute marginal opening (AMO) using Reichert Polyvar- Met 2 Optical Microscope using image processing software(Lucia) and all the measurements were subjected to statistical analysis using “unpaired„t‟ test” with p<0.05 was considered as the level of significance. The mean AMO measurements (µm) of the Lava coping samples (68.03+20.29) were significantly lower than that of Cerec3 coping samples (88+15.72) with shoulder margins (p<0.05) whereas with radial shoulder margins, Lava coping samples (42.89+4.03) were slightly higher than Cerec 3 coping samples (41.39+3.35). „P‟-value between Cerec 3 and Lava coping samples with shoulder and radial shoulder margin were not statistically significant (p<0.05).The mean AMO measurements (µm) of the Lava coping as well as crown samples with shoulder margin were less compared to Cerec 3 coping and crown samples. The mean AMO measurements (µm) of Cerec 3 coping samples with radial shoulder margins is less than Lava coping samples but identical with crown samples.Within the limitations of the study, for better marginal adaptation, radial shoulder finish line is suggested for Cerec 3 and shoulder finish line for Lava CAD-CAM systems.
Authors and Affiliations
Cherukuru Sameer Kumar Reddy, Nelluri Vizaikumar Vasudha, Madisetty Mahesh Babu, Kotagiri Satyendra kumar, Pulagam Mahesh, Pottem Srinivas Rao
Keywords
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- EP ID EP376512
- DOI 10.9790/0853-1706073847.
- Views 68
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