FDPS finish line design and tooth preparation technique.

Area of Science:

• Dental Prosthodontics
• Restorative Dentistry

Background:

• Achieving optimal aesthetics and marginal integrity in metal-ceramic restorations is crucial.
• Existing prosthetic preparation designs present limitations in meeting all clinical requirements.

Purpose of the Study:

• To perform and verify the efficacy of a "modified 50° preparation" technique for metal-ceramic crowns.
• To evaluate the aesthetic, marginal accuracy, periodontal compliance, conservation, and stability of restorations fabricated using this method.

Main Methods:

• Standardized tooth preparation using a "modified 50° preparation" involving a 50° bevel and a 27° circumferential shoulder.
• Laboratory fabrication of metal-ceramic crowns with meticulous attention to standardization.
• Standardized crown cementation technique.
• Inclusion of the sample in EPON resin and sectioning in the lingual-vestibular direction.
• Microscopic evaluation of the sections at various magnifications for final assessment.

Main Results:

• The modified 50° preparation successfully integrated the advantages of the 50° preparation and circumferential shoulder techniques.
• The combined 50° bevel and 27° shoulder design met the requirements for aesthetics, marginal accuracy, periodontal compliance, conservation, and stability.
• Microscopic analysis confirmed the favorable outcomes of the prosthetic preparation.

Conclusions:

• The modified 50° preparation is a viable prosthetic design for metal-ceramic restorations.
• This technique offers a balanced approach to achieving critical clinical and aesthetic parameters.
• It represents a valuable addition to the repertoire of marginal designs in prosthetic dentistry.