Comparison of three sintering methods

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Aydoğdu H. M., Eskitaşçıoğlu M.

39th Annual Conference of the European Prosthodontic Association, Praha, Czech Republic, 3 - 05 September 2015, pp.94

  • Publication Type: Conference Paper / Summary Text
  • City: Praha
  • Country: Czech Republic
  • Page Numbers: pp.94
  • Çanakkale Onsekiz Mart University Affiliated: No



To compare the sintering shrinkage of zirconia frameworks sintered with three different methods. 

Materials and Methods

 A CAI/CAD/CAM system (Cerec 3) was employed to produce 72 identical zirconia single crown frameworks on a cast metal mandibular molar abutment. All frameworks were milled by the same milling device (inLab MCXL) based on one digital design file. Occlusal and buccal dimensional measurements based on marked reference points were done with a Toolmaker’s microscope. Four reference points were marked on each surface, the projectional area and perimeter between four points were calculated. Frameworks were randomly assigned to three groups to be sintered with three determined programs with durations of 8 hours, 2 hours and 10 minutes. All dimensional measurements were repeated after sintering. 


Projectional area and perimeter changes after sintering were calculated and the sintering shrinkage of zircoina frameworks for three sintering groups were compared. The occlusal surface shrinkage values of 8 hour, 2 hour and 10 minute sintering groups were -20.283 %,-20.435%,-20.341% for perimeter and  -36.437%,-36.693%,-40.217% for area respectively. Buccal surface shrinkage values of 8 hour, 2 hour and 10 minute sintering groups were -20.052%, -20.107% and -20.087% for perimeter and -36.064%,-36.075% and-36.065%  for area respectively. Statistical analysis shows there is no significant difference between three groups (p>0.05).


The sintering shrinkage of zirconia single crown frameworks with 8 hour, 2 hour and 10 minute sintering programs were comparable.