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A Comparative Evaluation of Internal Adaptation and Marginal Fitness of Two Zirconium Design Fabricated by CAD/CAM

*Loura S. Marqus, ** Nabeel S. Martani

*MSc student, College of Dentistry, Hawler Medical University, Erbil, Iraq.
**Department of Conservative Dentistry, College of Dentistry, Hawler Medical University, Erbil, Iraq.

Submitted: 25/11/2018; Accepted: 16/12/2018; Published 31/12/2018



Objective: Full anatomic zirconia crowns had been launched to overcome the problems associated with veneering porcelain. The aim of this study was to evaluate the internal and marginal adaptation of CAD/CAM milled zirconia core to full anatomic zirconia crown.

Methods:  The mandibular right first molar of a dentaform model was prepared for the full ceramic crown with deep shoulder finish line. The model was scanned using intra-oral scanner to produce ten full anatomic zirconia crowns and ten zirconia cores. The internal and marginal adaptations (that represents the cement analog) were evaluated using the replica technique with the aid of a stereomicroscope.

Results: All There was no statistically significant difference between the internal and marginal adaptation of core and full anatomic zirconia crown, while a significant difference exists between them at the occlusal point that was greater in full anatomic crown. Both groups revealed the mean gap width of 146.7 +- 18 which is significant when compared to the standard value.

Conclusions: Both zirconia core and crown revealed comparable results of marginal and internal adaptation after sintering without any effect of bulk thickness. The obtained results were greater than the acceptable range.


Keywords: Zirconia bulk, Internal adaptation, Marginal gap, Replica technique.    
                                                                                                                                                                                                                                                                                                                                                      Full Article - PDF


1.Denry I, Kelly JR. State of the art of zirconia for dental applications. Dent Mater. 2008;24(3):299-307.
2. Filser F, Kocher P, Weibel F, Luthy H, Scharer P, Gauckler LJ. Reliability and strength of all-ceramic dental restorations fabricated by direct ceramic machining (DCM). Int J Comput Dent. 2001;4(2):89-106.
3. Manicone PF, Iommetti PR, Raffaelli L. An overview of zirconia ceramics: basic properties and clinical applications. J Dent. 2007;35(11):819-26.
4. Vagkopoulou T, Koutayas SO, Koidis P, Strub JR. Zirconia in dentistry: Part 1. Discovering the nature of an upcoming bioceramic. Eur J Esthet Dent. 2009;4(2):130-51.
5. Zarone F, Russo S, Sorrentino R. From porcelain- fused-to-metal to zirconia: clinical and experimental considerations. Dent Mater. 2011;27(1):83-96.
6. El-Ghany OS, Sherief AH. Zirconia-based ceramics, some clinical and biological aspects. Future Dent J. 2016;2(2):55-64.
7. Moldovan O, Luthardt RG, Corcodel N, Rudolph H. Three-dimensional fit of CAD/CAM-made zirconia copings. Dent Mater. 2011;27(12):1273-8.
8. Ha SJ, Cho JH. Comparison of the fit accuracy of zirconia-based prostheses generated by two CAD/CAM systems. J Adv Prosthodont. 2016;8(6):439-48.
9. Fahl JN, McLaren EA, Margeas RC. Monolithic vs. layered restorations: considerations for achieving the optimum result. Compend of Contin Educ Dent. 2014;35(2):78.
10. Lang NP, Pjetursson BE, Tan K, Brägger U, Egger M, Zwahlen M. A systematic review of the survival and complication rates of fixed partial dentures (FPDs) after an observation period of at least five years. II. Combined tooth--implant- supported FPDs. Clin Oral Implants Res.2004;15(6):643-53.
11. Boitelle P, Mawussi B, Tapie L, Fromentin O. A systematic review of CAD/CAM fit restoration evaluations. J Oral Rehabil. 2014;41(11):853-74.
12. Colpani JT, Borba M, Della Bona Á. Evaluation of marginal and internal fit of ceramic crown copings. Dent Mater. 2013;29(2):174-80.
13. Park JY, Kim HY, Kim JH, Kim JH, Kim WC. Comparison of prosthetic models produced by traditional and additive manufacturing methods. J Adv Prosthodont. 2015;7(4):294-302.
14. Rahme 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(2):25-32.
15. An S, Kim S, Choi H, Lee JH, Moon HS. Evaluating the marginal fit of zirconia copings with digital impressions with an intraoral digital scanner. J Prosthet Dent. 2014;112(5):1171-5.
16. Almeida e Silva JS, Erdelt K, Edelhoff D, Araújo É, Stimmelmayr M, Vieira LCC, et al. Marginal and internal fit of four-unit zirconia fixed dental prostheses based on digital and conventional impression techniques. Clin Oral Investig. 2014;18(2):515-23.
17. Weaver JD, Johnson GH, Bales DJ. Marginal adaptation of castable ceramic crowns. J Prosthet Dent. 1991;66(6):747-53.
18. Abduo J, Lyons K, Swain M. Fit of zirconia fixed partial denture: a systematic review. J Oral Rehabil. 2010;37(11):866-76.
19. Abdulkareem AM, Ibraheem AF. Comparison of the Marginal Fitness of the Ceramic Crowns Fabricated with Different CAD/CAM Systems (An In Vitro Study). J Bagh Coll Dentistry. 2016;28(4):28-33.
20. Ahlholm P, Sipilä K, Vallittu P, Jakonen M, Kotiranta U. Digital versus conventional impressions in fixed prosthodontics: a review. J Prosthodont. 2018;27(1):35-41.
21. Wettstein F, Sailer I, Roos M, Hämmerle CH. Clinical study of the internal gaps of zirconia and metal frameworks for fixed partial dentures. Eur J Oral Sci. 2008;116(3):272-9.
22. McLean JW, Von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique.Br Dent J. 1971;131(3):107–11.
23. Balkaya MC, Cinar A, Pamuk S. Influence of firing cycles on the margin distortion of 3 all- ceramic crown systems. J Prosthet Dent.2005;93(4):346-55.
24. Euán R, Figueras-Álvarez O, Cabratosa-Termes J, Oliver-Parra R. Marginal adaptation of zirconium dioxide copings: influence of the CAD/CAM system and the finish line design. J Prosthet Dent. 2014;112(2):155-62.
25. KARATASLI Ö, Kursoglu P, Capa N, Kazazoglu E. Comparison of the marginal fit of different coping materials and designs produced by computer aided manufacturing systems. Dent Mater J. 2011;30(1):97-102.
26. Pak HS, Han JS, Lee JB, Kim SH, Yang JH. Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns. J Adv Prosthodont. 2010;2(2):33-8.
27. Rinke S, Fornefett D, Gersdorff N, Lange K, Roediger M. Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings. Dent Mater J. 2012;31(4):601-9.
28. Jalalian E, Sadegh M, Masoomi S, Jalalian S, EvaziZiyaei A. Effect of Thickness of Zirconia Core on Marginal Adaptation of All-Ceramic Restorations. J Islam Dent Assoc Iran.2014;26(3):158-62.

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