Ceramic restorations: cast metal and cast glass

Area of Science:

• Dental Materials Science
• Prosthodontics
• Biomaterials

Background:

• A review of pertinent literature published between October 1989 and September 1990.
• Focuses on metal-ceramic and all-ceramic dental crowns.
• Addresses key areas including esthetics, material bonding, and alternative ceramic systems.

Purpose of the Study:

• To synthesize current research on metal-ceramic and all-ceramic crowns.
• To identify advancements and limitations in dental restorative materials during the specified period.
• To highlight areas requiring further investigation, particularly concerning titanium substructures.

Main Methods:

• Literature review of articles published within a one-year period (October 1989 - September 1990).
• Categorization of research into specific topic groups: esthetics, bond strength, all-ceramic alternatives, and porcelain surface properties.
• Analysis of findings related to photospectrophotometry, thermomechanical compatibility, material fit, strength, and surface treatments.

Main Results:

• Advancements in understanding photospectrophotometry and thermomechanical compatibility for porcelain-metal systems.
• Identification of deficiencies in fit and strength for certain all-ceramic crown systems.
• Further evidence supporting the effectiveness of porcelain polishing and documentation on ceramic etching techniques (e.g., Dicor).

Conclusions:

• Research during this period improved knowledge of metal-ceramic esthetics and bonding.
• All-ceramic systems showed promise but had documented limitations in fit and strength.
• Further research is needed on titanium and its alloys as substructures for ceramic materials.