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Comparison of the Marginal Fitness of the Ceramic Crowns Fabricated with Different CAD/CAM Systems (An In Vitro Study)

Authors: Akram M. Abdulkareem اكرم عبد الكريم --- Adel F. Ibraheem عادل فرحان ابراهيم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 28-33
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The marginal fit is the most characteristic that closely related to the longevity or success of a restoration, which is absolutely affected by the fabrication technique. The objective of present in vitro study was to evaluate the effect of four different CAD/CAM systems on the marginal fit of lithiμm disilicate all ceramic crowns.Materials and Methods: Adentoform tooth of a right mandibular first molar was prepared to receive all ceramic crown restoration with deep chamfer finishing line (1mm) and axial reduction convergence angle of 6 degree, dentoform model duplicated to have Nickel-Chromiμm master die. Thirty two stone dies produce from master die and distributed randomly in to four groups (8 dies for each group) according to the type of CAD/CAM system that used: Group A: fabricated with CERAMILL motion2 (Amann Girrbach); Group B:fabricated with CEREC in lab MCXL (Sirona);Group C: fabricated with CORiTEC 250i (imes-icore); Group D: fabricated with ZIRKONZAHN M5 (Zirkonzahn). Marginal discrepancy was measured at four points at each tooth surface. Sixteen points per tooth were measured using digital stereomicroscope at (140X) magnification.Results: ANOVA and LSD post Hoc tests were used to identify and localize the source of difference among the groups. It was found that there is a highly significant difference in the marginal gap mean values between group C and group D, and highly significant differences between group A and group D.Conclusions: From the above result we can conclude that better marginal fit values were may be exhibited by CORiTEC 250i CAD/CAM system.


Article
Marginal Discrepancy and Fracture Resistance of CAD/CAM Ceramill Sintron Metal Copings with Different Porcelain Materials

Authors: Ammar A. Al-Sa'ady --- Mustafa N. Abdulghani --- Eanas I. Jellil
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 2 Pages: 7-12
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study was performed to compare the marginal fit changes and facture resistance of metal ceramiccrowns constructed from Ceramill Sintron metal coping veneered with three different porcelain veneering materials(Vita Master Koromikos VMK, Willi Geller Creation CC and GC initial MC), also to evaluate the influence ofthermocycling on load at fracture.Materials and Methods: Master brass die was scanned ,then metal coping was designed and milled from CeramillSintron blank to get 60 metal copings, then divided randomly into three groups(20 sample), then veneered withporcelain: VITA, Creation or GC. The marginal gaps were measured before and after porcelain veneering thenmarginal fit changes was calculated. Fracture resistance test was done by Instron®, the master die was duplicatedto sixty analogs then each analog was fixed into acrylic base. After that each crown was cemented onto thecorresponding die analog. Ten samples of each group were subjected to compressive loading to fracture and otherten subjected to thermocycling followed by compressive loading to fracture.Result and Conclusion: The result of marginal fit changes showed that GC group had the lowest marginal gap followby VITA and Creation. While VITA group showed the highest fracture resistance follows by GC then Creation.Thermocycling process did not significantly reduce the load at fracture for all groups

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