[Studies on the composite joint in Cerec inlays]

Area of Science:

• Biomaterials Science
• Dental Materials
• Restorative Dentistry

Background:

• Advancements in dental restorative materials aim to improve longevity and aesthetics.
• Ceramic restorations, such as those made with the Cerec system, offer biocompatibility and esthetic advantages.
• Accurate cementation and marginal integrity are crucial for the success of indirect dental restorations.

Purpose of the Study:

• To morphometrically evaluate the joint gap between Cerec ceramic inlays and tooth preparations cemented with Dual Cement.
• To assess the variability in marginal gap dimensions in vitro.
• To identify potential weaknesses in the cementation system that could impact long-term clinical performance.

Main Methods:

• Thirty-two ceramic restorations were fabricated using the Cerec system.
• Restorations were adhesively fixed to extracted teeth with Dual Cement following manufacturer instructions.
• Histological preparation of restored teeth allowed for morphometric evaluation of the cement-luting interface at eight defined sites.

Main Results:

• The average joint width between ceramic inlays and tooth preparations was 118 microns (SD=53 microns).
• A notably wide range of variation was observed between the minimum and maximum measured joint widths.
• These findings indicate considerable inconsistency in the marginal gap dimensions.

Conclusions:

• The significant variability in joint widths suggests a potential clinical weakness for this cementation system.
• Clinically, large joint gaps may lead to cement washout and material collapse over time.
• Further long-term clinical studies are necessary to validate these in vitro findings and assess the clinical implications.