In vitro evaluation of the marginal and internal discrepancies of different esthetic restorations

This study examined the fit of two types of all-ceramic single crowns and indirect composite resin full coverage crowns. Thirty intact human mandibular first premolars were selected for this study and prepared using a machine to standardize the dimensions and randomly divided into 3 groups. Slip cas...

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Bibliographic Details
Published in:Journal of applied oral science 2013-12, Vol.21 (6), p.575-580
Main Author: Sakrana, Amal Abdelsamad
Format: Article
Language:English
Subjects:
Analysis of Variance
Cementation - methods
Ceramics
Composite Resins
Crowns
Dental Marginal Adaptation
Dental Restoration, Permanent - methods
Dentistry
DENTISTRY, ORAL SURGERY & MEDICINE
Esthetics, Dental
Humans
Materials Testing
Original
Random Allocation
Reference Values
Resin Cements
Time Factors
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Summary:This study examined the fit of two types of all-ceramic single crowns and indirect composite resin full coverage crowns. Thirty intact human mandibular first premolars were selected for this study and prepared using a machine to standardize the dimensions and randomly divided into 3 groups. Slip cast (IC) (In-Ceram Zirconia, Vita Zahnfabrik), copy-milled zirconia (CM) (ICE, Zirkonzahn) and indirect composite resin crowns (NECO, HeraeusKulzer, Hanau, Germany), (N=30, 10 per group) were fabricated according to each manufacturer's recommendations. Before cementation, discrepancies were measured at the marginal zone in each crown. Crowns were then cemented with G-Cem capsule self-adhesive luting cement (GC Corporation, Tokyo, Japan). Four positions were marked for each zone (mid-facial, mid-mesial, mid-distal, and mid-lingual) and three measurements were made at each of the four positions yielding to a total of 12 measurements per crown before and after cementation. The measurements were performed at a different magnification using a stereo microscope (SZ11, Olympus, Japan). Marginal, axial and occlusal zone discrepancies (µm) were evaluated after cementation. The data were statistically analyzed using two-way ANOVA and Tukey's test. Before cementation, significantly less marginal discrepancies were noted compared with after cementation in all groups (p0.05). Occlusal zone discrepancies were significantly higher than those of the marginal and axial zones in all groups (p
ISSN:1678-7757
1678-7765
1678-7765
1678-7757
DOI:10.1590/1679-775720130064