Comparison of Zirconia Copings Marginal Fitness Made from a Conventional Impression Technique and Gypsum Cast Technique by CAD/CAM

Document Type : Original Article

Authors

Department of Operative and Esthetic Dentistry, Faculty of Dentisty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

Abstract

Background and Objectives:One of the most important factors in restorations durability is their marginal integrity. Contradictory results are witnessed in previous studies; some find the conventional methods more accurate and others believe that the CAD-CAM is better. In this study, ma l fitness of zirconium copings that made from conventional impression and gypsum cast were compared.
Subjects and Methods: In this study, ten healthy premolar teeth were used. The teeth were prepared with a round edge shoulder bur. An impression was taken from each tooth and the impression was scanned with the scanner. The information obtained from the impression were transferred to software, and the computer sent the fabrication command to the milling device. While restoration milling is being started, the cast was made by special dye plaster. The obtained cast was scanned. The collected information of the cast was transferred to the software and the rest of the stages were done similar to the cast. The copings gained by the first and second methods are placed on the shaped tooth separately and the marginal gap was measured by direct observation using the SEM microscope in two Bucall/lingual and mesial/distal areas and five random points in each area were measured.
Results: There was significant difference in marginal gap dimensions between the tested groups (P<0.01). However,  there was no meaningful difference between the marginal dimensions between the two tested areas (Bacall/lingual and mesial/distal) (P>0.05).
Conclusion: Zirconia-based copings marginal accuracy depends on digital impression techniques although all of restorations did not have acceptable marginal accuracy and making copings from cast showed higher accuracy.

Keywords

References

-Karatasli O, Kursoglu P, Capa N.  Comparison of the marginal fit of different coping materials & designs producted by CAM systems.  Dent Mater J 2011; 26: 520-5.
2-Hyun-soon Pak, Jung-Suk Han.  Influence of porcelain veneering on the marginal fit of Digident & Lava CAD/CAM zirconia ceramic crowns.  Adv Prosthodont J 2010;2:33-38.
3-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(1):44-56.
4-bousheilb MN.Evaluation of zirconia/resin bond strength and interface quality using a new technique. J Adhes Dent. 2011; 13(3):255-60.
5-Mochales C, Maerten A, Rack A, Cloetns P, Mueller WD, Zaslansky P, FleckC.Monoclinic phase transformations of zirconia – based dental prostheses, induced by clinically practised surface manipulations. Acta Biomater. 2011; 7(7):2994 – 3002.
 6-Masek R.  Reproducing natural color effects on milled ceramic restorations.  Int J Comput Dent  1999;2(3):209-17.
7-Perng Ru Liu.A Panorama of Dental CAD/CAM restorative Systems. Compendium J2005;26: 507-13
8-Kaviani A,Dabaghi Tabriz F, KhalajK. Comparative evaluation of shear bond strength of composite to dentin using three different methods of lighting LED and conventional QTH light. Beheshti Univ Dent J 2013; 31(3):137-142
9-Heyman H, Swift E, Ritter A. Art and Science of Operative Dentistry: 6th  ed. Mosby Elsevier; 2013.288-289
10-Christensen GJ. Marginal fit of gold inlay castings. J Prosthet Dent 1966;16:297-305.
11-Sorensen JA. A standardized method for determination of crown margin fidelity. J Prosthet Dent 1990;64:18-24.
12-Shinyoung An, Sungtae K, Hyunmin C, Jae-Hoon L, Hong-Seok M. Evaluating the marginal fit of zirconia copings with digital impressions with an intraoral digital scanner. J Prosthet Dent 2014;112: 1171–1175.
13-Jonathan Ng, Dorin Re, Chris W. A comparison of the marginal fit of crowns fabricated with digital and conventional methods. J Prosthet Dent 2014;112: 555–560.
14-Hiroshi Hirayama, Yu-Ching Chang. Fit of zirconia copings generated from a digital impression technique and a conventional impression technique[dissertation]. Boston: Univ. Tufts;2010.
15-Boeddinghaus M, Breloer ES, Rehmann P, Wöstmann B. Accuracy of single-tooth restorations based on intraoral digital and conventional impressions in patients. Clin Oral Invest 2015;10:1430-1437.
 
 
 
 
 
 
 
 
Jundishapur Scientific Medical Journal
Volume 14, Issue 3 - Serial Number 96
May and June 2015
Pages 245-254

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History

  • Receive Date: 10 December 2014
  • Revise Date: 26 April 2015
  • Accept Date: 30 June 2015

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