J Korean Acad Prosthodont.  2002 Feb;40(1):30-41.

Marginal Adaptation Of The Conical Inner Crown Fabricated With Cad/cam

• Kim IS
• Kang DW

Abstract

This study was to evaluate the fabrication method and marginal adaptation of the conical inner crown fabricated with CAD/CAM.The informations on abutment teeth were transferred to a computer with a micro contact digitizer,which had a 50mum accuracy on the master die.A conical inner crown was designed on a computer and a real crown was machined based on this design using CAM. The marginal fit of a computer-machined conical inner crown was assessed using electron microscopy. Measurement of the marginal gap between the conical inner crown and the abutment was performed on four different locations (mesial,distal,buccal,and lingual surfaces)of the finish line. The evaluation was based on 10 test specimens. The results were as follow. 1.The mean marginal gap between the conical inner crown and abutment tooth was 83.2 +/-43mum,28.9%of the specimen showed marginal gap over 100 m. 2.The fabrication method using CATRS and CAM provided clinically acceptable marginal fitness compared to conventional casting method (p<0.05).

MeSH Terms

Crowns*
Microscopy, Electron
Tooth