Marginal gap width of a new refractory porcelain system

Area of Science:

• Dental Materials Science
• Prosthodontics
• Ceramic Restorations

Background:

• Marginal accuracy is crucial for the longevity and fit of indirect dental restorations.
• Porcelain inlays require precise adaptation to tooth preparations to prevent secondary caries and maintain occlusal harmony.
• Refractory die materials play a key role in the fabrication of accurate ceramic restorations.

Purpose of the Study:

• To evaluate if matching the physical properties of refractory die material to porcelain enhances the marginal accuracy of porcelain inlays.
• To compare the marginal gap of porcelain inlays fabricated using a matched refractory system versus an unmatched system.

Main Methods:

• Fabrication of 30 addition-silicone impressions from a master inlay preparation.
• Creation of 15 refractory dies for each of two material systems: one matched (Fortune) and one unmatched (Vita porcelain with Polyvest refractory).
• Measurement of the marginal gap using a microscope with micrometer adjustment on prepared dies with applied porcelain.

Main Results:

• The matched refractory porcelain system resulted in a significantly smaller mean marginal gap (51.24 ± 20.84 microns) compared to the unmatched system (100.43 ± 17.30 microns).
• A Student's t-test confirmed a statistically significant difference (p < 0.005) in marginal gap between the matched and unmatched systems.
• The unmatched system exhibited a substantially larger mean marginal gap, indicating poorer adaptation.

Conclusions:

• Matching the physical properties of refractory die material to porcelain significantly improves the marginal accuracy of porcelain inlays.
• Utilizing a matched refractory porcelain system is recommended for achieving superior fit and potentially better clinical outcomes in porcelain inlay fabrication.
• This finding has implications for optimizing material selection in dental laboratories for enhanced restoration quality.