Open Access, Peer-reviewed, Quarterly
pISSN 0301-2875
eISSN 2005-3789
    J Korean Acad Prosthodont. 2016 Jul;54(3):226-233. Korean.
    Published online Jul 26, 2016.
    https://doi.org/10.4047/jkap.2016.54.3.226
    Copyright © 2016 The Korean Academy of Prosthodontics
    Original Article

    Comparison of micro CT and cross-section technique for evaluation of marginal and internal fit of lithium disilicate crowns

    In-Seok Ko,1 Jeong-Mi Kim,2 and Hye-Won Cho1
      • 1Department of Dentistry, Graduate School, Wonkwang University, Iksan, Republic of Korea.
      • 2Dental Laboratory, Wonkwang University Dental Hospital, Iksan, Republic of Korea.
    • Corresponding Author: Hye-Won Cho. Department of Dentistry, Graduate School, Wonkwang University, 460 Iksan-Daero, Iksan 54538, Republic of Korea. +82 (0)63 859 2938: Email: hwcho@wku.ac.kr
    Received May 03, 2016; Revised June 10, 2016; Accepted June 20, 2016.

    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.

    Abstract

    Purpose

    The purpose of this study was to evaluate the adaptation of lithium disilicate crowns fabricated by CAD-CAM (computer aided design-computer aided manufacturing) and heat-press technique to compare two different measurement methods in assessing fit of the ceramic crowns: micro CT and cross-section technique.

    Materials and methods

    A prepared typodont mandibular molar for ceramic crown was duplicated and ten dies were produced by milling the PMMA (polymethylmethacrylate) resin. Ten vinyl polysiloxane impressions were made and stone casts were produced. Five dies were used for IPS e.max Press crowns with heat-press technique. The other five dies were used for IPS e.max CAD crowns with CAD-CAM technique. Ten lithium disilicate crowns were cemented on the resin dies using zinc phosphate cement with finger pressure. The marginal and internal fits in central buccolingual plane were evaluated using a micro CT. Then the specimens were embedded and cross-sectioned and the marginal and internal fits were measured using scanning electronic microscope. The two measurement methods and two manufacturing methods were compared using Mann-Whitney U test (SPSS 22.0).

    Results

    The marginal and internal fit values using micro CT and cross-section technique were similar, showing no significant differences. There were no significant differences in adaptation between lithium disilicate crowns fabricated with CAD-CAM and heat-press technique.

    Conclusion

    Both micro CT and cross-section technique were acceptable methods in the evaluation of marginal and internal fit of lithium disilicate crown. There was no difference in adaptation between lithium disilicate crowns fabricated with CAD-CAM and heat-press technique except occlusal fit.

    Keywords
    Micro CT; Marginal fit; Internal fit; Computer aided design-computer aided manufacturing (CAD-CAM)

    Figures

    Fig. 1
    Prepared resin master die.

    Fig. 2
    Micro CT analysis of adaptation.

    Fig. 3
    Eight reference points showing sites of marginal fit (1, 8), cervical fit (2, 7), axial fit (3, 6) and occlusal fit (4, 5).

    Fig. 4
    Cross-sectioning of resin die-ceramic crown complex.

    Fig. 5
    SEM analysis of adaptation. LDS: lithium disilicate.

    Tables

    Table 1
    Descriptive statistics of internal adaptation according to fabricating method using micro CT and cross section technique

    Table 2
    Descriptive statistics of internal adaptation of lithium disilicate crowns according to measurement method

    Notes

    This study was partially supported by Wonkwang University 2016.

    References

      1. Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part I: core materials. J Prosthet Dent 2002;88:4–9.
      1. Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part II: core and veneer materials. J Prosthet Dent 2002;88:10–15.
      1. Conrad HJ, Seong WJ, Pesun IJ. Current ceramic materials and systems with clinical recommendations: a systematic review. J Prosthet Dent 2007;98:389–404.
      1. Seghi RR, Daher T, Caputo A. Relative flexural strength of dental restorative ceramics. Dent Mater 1990;6:181–184.
      1. Sulaiman F, Chai J, Jameson LM, Wozniak WT. A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns. Int J Prosthodont 1997;10:478–484.
      1. Miyazaki T, Hotta Y, Kunii J, Kuriyama S, Tamaki Y. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dent Mater J 2009;28:44–56.
      1. Reich S, Wichmann M, Nkenke E, Proeschel P. Clinical fit of all-ceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems. Eur J Oral Sci 2005;113:174–179.
      1. Contrepois M, Soenen A, Bartala M, Laviole O. Marginal adaptation of ceramic crowns: a systematic review. J Prosthet Dent 2013;110:447–454.
      1. Moon BH, Yang JH, Lee SH, Chung HY. A study on the marginal fit of all-ceramic crown using CCD camera. J Korean Acad Prosthodont 1998;36:273–292.
      1. Groten M, Girthofer S, Pröbster L. Marginal fit consistency of copy-milled all-ceramic crowns during fabrication by light and scanning electron microscopic analysis in vitro. J Oral Rehabil 1997;24:871–881.
      1. Rahmé HY, Tehini GE, Adib SM, Ardo AS, Rifai KT. In vitro evaluation of the "replica technique" in the measurement of the fit of Procera crowns. J Contemp Dent Pract 2008;9:25–32.
      1. Wolfart S, Wegner SM, Al-Halabi A, Kern M. Clinical evaluation of marginal fit of a new experimental all-ceramic system before and after cementation. Int J Prosthodont 2003;16:587–592.
      1. Pelekanos S, Koumanou M, Koutayas SO, Zinelis S, Eliades G. Micro-CT evaluation of the marginal fit of different In-Ceram alumina copings. Eur J Esthet Dent 2009;4:278–292.
      1. Neves FD, Prado CJ, Prudente MS, Carneiro TA, Zancopé K, Davi LR, Mendonça G, Cooper LF, Soares CJ. Micro-computed tomography evaluation of marginal fit of lithium disilicate crowns fabricated by using chairside CAD/CAM systems or the heat-pressing technique. J Prosthet Dent 2014;112:1134–1140.
      1. Gardner FM. Margins of complete crowns-literature review. J Prosthet Dent 1982;48:396–400.
      1. Council on Dental Materials and Devices. Revised American National Standards Institute/American Dental Association Specification No. 8 for zinc phosphate cement. J Am Dent Assoc 1978;96:121–123.
      1. McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J 1971;131:107–111.
      1. Gulker I. Margins. N Y State Dent J 1985;51:213–215. 217.
      1. Moldovan O, Rudolph H, Quaas S, Bornemann G, Luthardt RG. Internal and external fit of CAM-made zirconia bridge frameworks-a pilot study. Dtsch Zahnärztl Z 2006;61:38–42.
      1. Kydd WL, Nicholls JI, Harrington G, Freeman M. Marginal leakage of cast gold crowns luted with zinc phosphate cement: an in vivo study. J Prosthet Dent 1996;75:9–13.
      1. White SN, Kipnis V. Effect of adhesive luting agents on the marginal seating of cast restorations. J Prosthet Dent 1993;69:28–31.
      1. Davis DR. Comparison of fit of two types of all-ceramic crowns. J Prosthet Dent 1988;59:12–16.
      1. Abbate MF, Tjan AH, Fox WM. Comparison of the marginal fit of various ceramic crown systems. J Prosthet Dent 1989;61:527–531.
      1. Pimenta MA, Frasca LC, Lopes R, Rivaldo E. Evaluation of marginal and internal fit of ceramic and metallic crown copings using x-ray microtomography (micro-CT) technology. J Prosthet Dent 2015;114:223–228.
      1. Keshvad A, Hooshmand T, Asefzadeh F, Khalilinejad F, Alihemmati M, Van Noort R. Marginal gap, internal fit, and fracture load of leucite-reinforced ceramic inlays fabricated by CEREC inLab and hot-pressed techniques. J Prosthodont 2011;20:535–540.
      1. Mörmann WH, Schug J. Grinding precision and accuracy of fit of CEREC 2 CAD-CIM inlays. J Am Dent Assoc 1997;128:47–53.
      1. Mously HA, Finkelman M, Zandparsa R, Hirayama H. Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique. J Prosthet Dent 2014;112:249–256.
      1. Raigrodski AJ. Contemporary materials and technologies for all-ceramic fixed partial dentures: a review of the literature. J Prosthet Dent 2004;92:557–562.
      1. Rungruanganunt P, Kelly JR, Adams DJ. Two imaging techniques for 3D quantification of pre-cementation space for CAD/CAM crowns. J Dent 2010;38:995–1000.
      1. Krasanaki ME, Pelekanos S, Andreiotelli M, Koutayas SO, Eliades G. X-ray microtomographic evaluation of the influence of two preparation types on marginal fit of CAD/CAM alumina copings: a pilot study. Int J Prosthodont 2012;25:170–172.
    MeSH Terms
    Ceramics
    Computer-Aided Design
    Crowns*
    Fingers
    Lithium*
    Molar
    Polymethyl Methacrylate
    Siloxanes
    Zinc Phosphate Cement
    Metrics
    Share
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