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Vertical marginal gap assessment of cad on veneered pekk crowns versus cad on veneered zirconia crowns : A Randomized in vitro study / Nada Fouad Fahmy ; Nada Fouad Fahmy , Reham el basety , Mohamed Abbas

By: Contributor(s): Material type: TextTextPublication details: 2022.Content type:
  • text
Media type:
  • Unmediated
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Other title:
  • تقييم المسافه الحافيه الرأسيه لهيكل من البيكتون وهيكل من الزركونيا مغطاه بكسوه خزفيه من الليثيوم داىسيليكات دراسه فالمختبر
Subject(s): DDC classification:
  • 610
Dissertation note: Thesis (M.Sc.)-Cairo University- Faculty of Oral and Dental Medicine - Department of Fixed prosthodontics Summary: Aim: The aim of this study was to evaluate vertical marginal gap of CAD-CAM milled PEKK as a framework material to be veneered with CAD-On lithium disilicate glass ceramic as compared to milled zirconia framework veneered with CAD-On lithium disilicate glass ceramic. Methodology: 14 freshly extracted molars were embedded in epoxy blocks. A uniform 1.5 mm axial reduction (100 taper) and 1,5 mm occlusal reduction with a 3600 deep chamfer finish line (1 mm thickness) was prepared on all teeth. Scanning and designing of the restorations were done and the final design was split in the software into core and veneer layers to be milled separately. Fusion of the veneer to the core was the only manual step done in crown construction; it was done using low fusing glass material (IPS e.max Crystall./ Connect) in the control zirconia group and using adhesive resin cement (multilink) in the PEKK group as recommended by the manufacturer. All the crowns were adhesively cemented on their corresponding preparations using Duo-link adhesive resin cement. All the specimens were subjected to thermo-mechanical fatigue loading for 150,000 cycle simulating one year’ clinical service .Vertical marginal gap was assessed using stereomicroscope of the two groups before and after thermomechanical aging for all the specimens. Results: PEKK group recorded statistically significant (P<0.05) higher marginal gap mean value (59.97±2.541 µm) than Zirconia group (41.79±4.424 µm). Regardeless to material type ,totally it was found that after mechanical aging the marginal gap mean value was higher (54.36±13.73 µm) than before (47.39±10.88 µm) and this was statistically non-significant (P=0.1741 > 0.05) as indicated by two way ANOVA followed by pair-wise Tukey’s post-hoc tests vii Conclusions: Within the limitations of this study, Zirconia showed lower mean marginal gap distance, the mean marginal gap distance of all tested specimens were within the acceptable clinical value which is less than 12o µm , PEKK can be used as a definitive fixed restorations that have an acceptable marginal gap distance and CAD ON veneering technique can be used as a novel technique for PEKK veneering
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Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.09..09.M.Sc.2020.Ma.VV (Browse shelf(Opens below)) Not for loan 01010110086176000

Thesis (M.Sc.)-Cairo University- Faculty of Oral and Dental Medicine - Department of Fixed prosthodontics

Bibliography: p. 94-110.

Aim: The aim of this study was to evaluate vertical marginal gap of CAD-CAM milled PEKK as a framework material to be veneered with CAD-On lithium disilicate glass ceramic as compared to milled zirconia framework veneered with CAD-On lithium disilicate glass ceramic. Methodology: 14 freshly extracted molars were embedded in epoxy blocks. A uniform 1.5 mm axial reduction (100 taper) and 1,5 mm occlusal reduction with a 3600 deep chamfer finish line (1 mm thickness) was prepared on all teeth. Scanning and designing of the restorations were done and the final design was split in the software into core and veneer layers to be milled separately. Fusion of the veneer to the core was the only manual step done in crown construction; it was done using low fusing glass material (IPS e.max Crystall./ Connect) in the control zirconia group and using adhesive resin cement (multilink) in the PEKK group as recommended by the manufacturer. All the crowns were adhesively cemented on their corresponding preparations using Duo-link adhesive resin cement. All the specimens were subjected to thermo-mechanical fatigue loading for 150,000 cycle simulating one year’ clinical service .Vertical marginal gap was assessed using stereomicroscope of the two groups before and after thermomechanical aging for all the specimens. Results: PEKK group recorded statistically significant (P<0.05) higher marginal gap mean value (59.97±2.541 µm) than Zirconia group (41.79±4.424 µm). Regardeless to material type ,totally it was found that after mechanical aging the marginal gap mean value was higher (54.36±13.73 µm) than before (47.39±10.88 µm) and this was statistically non-significant (P=0.1741 > 0.05) as indicated by two way ANOVA followed by pair-wise Tukey’s post-hoc tests vii Conclusions: Within the limitations of this study, Zirconia showed lower mean marginal gap distance, the mean marginal gap distance of all tested specimens were within the acceptable clinical value which is less than 12o µm , PEKK can be used as a definitive fixed restorations that have an acceptable marginal gap distance and CAD ON veneering technique can be used as a novel technique for PEKK veneering

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