Abstract
ObjectiveThis study examined the fit of two types of all-ceramic single crowns and indirect composite resin full coverage crowns. Material and MethodsThirty 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. ResultsBefore cementation, significantly less marginal discrepancies were noted compared with after cementation in all groups (p<0.05). No significant differences were found within each zone (Marginal= IC: 84.2, NECO: 95.22, CM: 84.22; Axial= IC: 54.22, NECO: 64.2, CM: 55.22; Occlusal= IC: 119.97, NECO: 129.18, CM: 121.15) in the three crown systems (p>0.05). Occlusal zone discrepancies were significantly higher than those of the marginal and axial zones in all groups (p<0.05). ConclusionsSlip cast and copy-milled zirconia crowns showed comparable fit to composite resin crowns in all marginal, axial and occlusal areas.
Highlights
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Some authors reported that the copyPLOOLQJ UHVWRUDWLRQ ZDV OHVV DFFXUDWH FRPSDUHG ZLWK RWKHU PHWKRGV +RZHYHU FRS\PLOOHG VLQJOH FURZQV KDYH EHHQ VKRZQ WR EH ELRORJLFDOO\ DFFHSWDEOH DQG have relatively homogenous marginal gaps10
Summary
The demand for esthetically pleasing dental UHVWRUDWLRQV KDV PDGH WKH DOOFHUDPLF FURZQ D SRSXODU IRUP RI UHVWRUDWLRQ &HUDPLFV ZLWK D ]LUFRQLXP R[LGH IUDPHZRUN KDYH EHFRPH WKH standard for indirect esthetic restorative materials These all-ceramic systems have high fracture strength and high survival rates clinically. McLean and Von Fraunhofer (1971) examined PRUH WKDQ FURZQV DIWHU D \HDU SHULRG DQG FRQFOXGHG WKDW D PDUJLQDO RSHQLQJ RI NjP ZDV clinically acceptable With these considerations, the purpose of this VWXG\ ZDV WR FRPSDUH WKH PDUJLQDO RSHQLQJ DQG internal adaptation of zirconia-based restorations and indirect composite resin full coverage UHVWRUDWLRQV ZKLFK DUH FRPPRQO\ XVHG IRU WKH IDEULFDWLRQ RI VLQJOHFURZQ UHVWRUDWLRQV +RZHYHU measurement data for the marginal and internal ¿W RI WKH FRS\ PLOOLQJ ,&( 7UDQVOXFHQW ]LUFRQLD (Zirkonzahn GmbH,Bruneck, Italy) and indirect composite resin (NECO, HeraeusKulzer,GmbH, Hanau, Germany) have not been reported
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