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Tooth Preparation Considerations for CAD/CAM Materials in Restorative Dentistry
EP32786
Poster Title: Tooth Preparation Considerations for CAD/CAM Materials in Restorative Dentistry
Submitted on 10 Jul 2020
Author(s): Dr. Yunus Ahmed
Affiliations: Bangalore Institute of Dental Sciences and Hospital, RGUHS, Bangalore, India
Poster Views: 611
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Poster Information
Abstract: Computer-aided design (CAD) and Computer-aided Manufacturing(CAM) have provided dentists the luxury of same day crown delivery. They have become increasingly popular with various applications such as Inlays, Onlays, Crowns, Veneers, Fixed partial Dentures and Implant abutments. Subtractive manufacturing has become an important aspect of success of the restoration processed using CAD/CAM technology. It is the process of removal of material from homogenous, monolithic blocks which are processed in Lab using carbide or diamond burs to create the shape of the restoration. This is done in order to achieve optimal fit by modifying the tooth preparations. Thickness of the all ceramic restoration is vital from preventing the bulk fracture of the material. The final internal shape must allow complete and passive seating of the restoration. Drill compensation is defined as the process of designing the internal shell for compatibility with the burns in the milling unit. The preparation guidelines given in the poster must be followed in order to prevent the unexpected loss of thickness from drill compensation. Sharp cusp tips must be flattened and sharp corners should be smoothened out in posterior teeth. In Anterior teeth, the incisal edge should be as flat and wide as possible. These basic guidelines help in achieving predictable outcome with CAD/CAM restorations. Summary: Subtractive manufacturing is an important aspect where clinicians are required to make minor changes to the tooth preparation in order to minimize effects of drill compensation and lessen the risk of overmilling. The treatment plan must change to full contour zirconia from a glass ceramic material if the case results in overmilling. The final acceptable restoration must be seated passively and have acceptable margins.References: 1. Capt. Peter R. Barndt, Stephen J. Sterlitz, Dennis J. Fasbinder.
Decisions in Dentistry. March 2020;6(3):16-18,21.
2. Davidowitz G, Kotick PG. The use of CAD/CAM in dentistry. Dent Clin North Am. 2011;55(3):559-ix. doi:10.1016/j.cden.2011.02.011
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