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International Poster Journal of Dentistry and Oral Medicine
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Int Poster J Dent Oral Med 11 (2009), No. 4     15. Dec. 2009

Int Poster J Dent Oral Med 2009, Vol 11 No 4, Poster 471

CAD/CAM technology for zirconia based ceramics frameworks achieving

Language: English
 

Authors:
Assist. Prof. Dr. Sorin Porojan, Assoc. Prof. Dr. Liliana Sandu, Assist. Prof. Dr. Florin Topala, Prof. Dr. Cristina Maria Bortun,
"Victor Babes" University of Medicine and Pharmacy Timisoara, University School of Dentistry, Timisoara, Romania

Date/Event/Venue:
15-18 June 2008
The International MRS 2008 Conference Beijing AAA Satelite Meeting on Advanced Technologies for Advanced Characterizations of Advanced Materials
Beijing, China
 

Introduction

Restorations produced with computer assistance are increasingly being adopted in dental technology. They require basic knowledge in this field, but the access to new, an increase in quality and reproducibility, an improvement in precision, as well as an increase in efficiency are some of the reasons to make efforts.
 

Objectives

The aim of the study was to evaluate the effectiveness of the technological procedures in achieving zirconia based ceramics frameworks using Cercon CAD/CAM system.
 

Material and Methods

Data capture from models were made using an 3D laser scanner Cercon Eye with a precision down to the µm range (Fig. 1, 2). The scanner is an integrated part of the CAD/CAM system and operates only in combination with the dedicated soft Cercon art 2.2. It calculates the magnification factor and controls the conversion in the milling program. The virtual 3D dental restorations were designed on the computer screen following the specific steps. The CAD software transforms the virtual model into specific set of commands which drive the CAM unit. CAM complete oversized restorations were created by substraction from presintered soft prefabricated zirconium oxide blocks (Fig. 3, 4), processed and finally these were sintered and reduced to the original size (Fig. 5, 6, 7).

Fig. 1: Cast prepared for scanning Fig. 2: Scanning of a die
Fig. 3: Scaning of the presintered soft prefabricated zirconium oxide block Fig. 4: Oversized milled restoration
Fig. 5: Sandblasting of the restoration Fig. 6: Oversized restoration
Fig. 7: Final sintered restoration
 
 

Results

Using Cercon system a wide variety of frameworks from zirconia based ceramics can be fabricated. They require subsequent veneering using other methods to achieve adequate aesthetics.
 

Conclusions

Handling with Cercon CAD/CAM system is easy for the practitioner. It is important that the user can modify the automatically designed restorations and individualize them to each clinical case.
 

Acknowledgements

This study was supported by the Grant IDEI_1264/2007.
 

Literature

  1. Barnfather K.D., Brunton P.A.:Restoration of the upper dental arch using Lava all-ceramic crown and bridgework. Br Dent J. Jun 23;202(12):731-5, 2007
  2. Beuer F., Schweiger J., Edelhoff D.: Digital dentistry: an overview of recent developments for CAD/CAM generated restorations. Br Dent J. May 10; 204(9):505-11, 2008
  3. Rudolph H., Luthardt R.G., Walter M.H.: Computer-aided analysis of the influence of digitizing and surfacing on the accuracy in dental CAD/CAM technology. Comput Biol Med. May;37(5):579-87, 2007
  4. Tinschert J., Natt G., Hassenpflug S., Spiekermann H.: Status of current CAD/CAM technology in dental medicine. Int J Comput Dent. Jan;7(1):25-45, 2004
     

This Poster was submitted by Assist. Prof. Dr. Sorin Porojan.
 

Correspondence address:
Assist. Prof. Dr. Sorin Porojan
"Victor Babes" University of Medicine and Pharmacy Timisoara
University School of Dentistry
2 L. Blaga Str., App. 5
code 300002, Timisoara, Romania