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      Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns

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          Abstract

          PURPOSE

          Marginal fit is a very important factor considering the restoration's long-term success. However, adding porcelain to copings can cause distortion and lead to an inadequate fit which exposes more luting material to the oral environment and causes secondary caries. The purpose of this study was to compare the marginal fit of 2 different all-ceramic crown systems before and after porcelain veneering. This study was also intended to verify the marginal fit of crowns originated from green machining of partially sintered blocks of zirconia (Lava CAD/CAM system) and that of crowns obtained through machining of fully sintered blocks of zirconia (Digident CAD/CAM system).

          MATERIALS AND METHODS

          20 crowns were made per each system and the marginal fit was evaluated through a light microscope with image processing (Accura 2000) at 50 points that were randomly selected. Each crown was measured twice: the first measurement was done after obtaining a 0.5 mm coping and the second measurement was done after porcelain veneering. The means and standard deviations were calculated and statistical inferences among the 2 groups were made using independent t-test and within the same group through paired t-test.

          RESULTS

          The means and standard deviations of the marginal fit were 61.52 ± 2.88 µm for the Digident CAD/CAM zirconia ceramic crowns before porcelain veneering and 83.15 ± 3.51 µm after porcelain veneering. Lava CAD/CAM zirconia ceramic crowns showed means and standard deviations of 62.22 ± 1.78 µm before porcelain veneering and 82.03 ± 1.85 µm after porcelain veneering. Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group. However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well.

          CONCLUSION

          The 2 all-ceramic crown systems showed marginal gaps that were within a reported clinically acceptable range of marginal discrepancy.

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          Most cited references24

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          Clinical fit of all-ceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems.

          Sven Reich, Manfred Wichmann, Emeka Nkenke … (2005)
          In this study, the hypothesis was tested that the marginal and internal fit of CAD/CAM fabricated all-ceramic three-unit fixed partial dentures (FPDs) can be as good as in metal-ceramic FPDs. Twenty-four all-ceramic FPDs were fabricated and randomly subdivided into three equally sized groups. Eight frameworks were fabricated using the Digident CAD/CAM system (DIGI), another eight frameworks using the Cerec Inlab system (INLA). Vita Inceram Zirkonia blanks were used for both groups. In a third group frameworks were milled from yttrium-stabilized Zirconium blanks using the Lava system (LAVA). All frameworks were layered with ceramic veneering material. In addition, six three-unit metal-ceramic FPDs served as control group. All FPDs were evaluated using a replica technique with a light body silicone stabilized with a heavy body material. The replica samples were examined under microscope. The medians of marginal gaps were 75 microm for DIGI, 65 microm for LAVA and INLA and 54 microm for the conventional FPDs. Only the DIGI data differed significantly from those of the conventional FPDs. Within the limits of this study, the results suggest that the accuracy of CAD/CAM generated three-unit FPDs is satisfactory for clinical use.
          Article 0 comments Cited 57 times – based on 0 reviews     Review now
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            Evaluation of the marginal accuracy of different all-ceramic crown systems after simulation in the artificial mouth.

            S M Beschnidt, J R Strub (1999)
            The in vitro marginal fit of five different all-ceramic crown systems (In-Ceram, Empress staining technique, Empress veneering technique, Celay feldspathic system, Celay In-Ceram system) was evaluated before and after cyclic preloading in an artificial mouth. The crowns were adhesively luted to extracted natural maxillary incisors prepared with a 90 degrees shoulder. The results were compared to those for porcelain-fused-to-metal (PFM) crowns with circular porcelain-butt margins which were cemented with zinc phosphate cement. The analysis of the marginal discrepancies showed significant (P < 0.001) differences among the groups. Crown cementation increased the marginal gaps significantly (P < 0.01). Empress staining technique crowns showed the smallest marginal gaps (median 47 microm), followed by conventional In-Ceram crowns (median 60 microm) and Empress veneer technique crowns (median 62 microm). Celay In-Ceram crowns displayed marginal openings with a median of 78 microm, followed by Celay feldspathic crowns with a median of 99 microm. The marginal gap of the PFM control crowns showed a median of 64 microm. Ageing in the chewing simulator had no significant influence on the marginal fit of all specimens. The study indicates that all the tested all-ceramic crowns have clinically acceptable margins. However, in vivo investigations of all all-ceramic crown systems should be made before clinical routine.
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              Marginal adaptation of castable ceramic crowns.

              Donald Weaver, G V Johnson, D Bales (1991)
              Tooth preparations and seating techniques of castable ceramic crowns differ from metal ceramic crowns. This study evaluated the variable effects of cementation on the marginal adaptation of Dicor, Cerestore, and porcelain-fused-to-metal crowns. The shoulder preparation was maintained for ceramic crowns, and a cavosurface bevel was designed for metal ceramic crowns. Crowns were made with a replication size of 10, placed on master dies, and the marginal openings measured with a Nikon Measurescope 20 instrument. Thirty crowns were cemented with zinc phosphate cement and the recommended clinical force. Marginal adaptation was not improved with a gingival bevel preparation or an increased seating force. The best marginal adaptation was recorded for Cerestore crowns.
              Article 0 comments Cited 26 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Adv Prosthodont
                Journal ID (publisher-id): JAP
                Title: The Journal of Advanced Prosthodontics
                Publisher: The Korean Academy of Prosthodontics
                ISSN (Print): 2005-7806
                ISSN (Electronic): 2005-7814
                Publication date (Print): June 2010
                Publication date (Electronic): 30 June 2010
                Volume: 2
                Issue: 2
                Pages: 33-38
                Affiliations
                Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
                Author notes
                Corresponding author: Jae-Ho Yang. Department of Prosthodontics, School of Dentistry, Seoul National University 62 Changgeonggungno, Jongno-Gu, Seoul, 110-749, Korea. Tel, +82 2 2072 2661: jhoyang@ 123456snu.ac.kr
                Article
                DOI: 10.4047/jap.2010.2.2.33
                PMC ID: 2984519
                PubMed ID: 21165185
                SO-VID: d09b4ea9-100d-4df8-913c-cef224b86fb2
                Copyright © Copyright © 2010 The Korean Academy of Prosthodontics
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 03 March 2010
                Date revision received : 06 March 2010
                Date accepted : 17 June 2010
                Categories
                Subject: Original Article

                ScienceOpen disciplines: Dentistry
                Keywords: digident cad/cam zirconia ceramic crown,lava cad/cam ceramic crown,porcelain veneering,marginal fit
                Data availability:
                ScienceOpen disciplines: Dentistry
                Keywords: digident cad/cam zirconia ceramic crown, lava cad/cam ceramic crown, porcelain veneering, marginal fit

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