Polished versus autoglazed dental porcelain

Area of Science:

• Dental Materials Science
• Surface Engineering
• Biomaterials

Background:

• Achieving a smooth, high-quality surface finish on dental porcelain is essential for aesthetics and longevity.
• Traditional oven reglazing is a common method, but chairside polishing systems offer an alternative.
• The effectiveness of various polishing techniques in replicating oven-glazed finishes requires objective comparison.

Purpose of the Study:

• To compare the surface finish quality of dental porcelain polished with four different paste systems against oven reglazing and a non-paste adjustment kit.
• To evaluate the efficacy of chairside polishing methods in achieving a surface comparable to conventional oven glazing.
• To provide data to guide the selection of appropriate dental porcelain finishing techniques.

Main Methods:

• Four distinct dental porcelain polishing paste systems were tested.
• Dental porcelain samples were polished using these systems, oven reglazed, or adjusted with a kit without paste.
• Surface finish quality was assessed through independent visual examination and scanning electron microscopy (SEM).

Main Results:

• Visual assessment indicated two polishing paste systems produced finishes equal to or better than oven glazing.
• Scanning electron microscopy (SEM) revealed that oven glazing yielded a superior surface quality compared to all tested polishing methods.
• Significant differences in surface topography were observed between polishing systems and oven glazing.

Conclusions:

• Not all available dental porcelain polishing paste systems can achieve a surface finish comparable to oven-glazed porcelain.
• Careful selection of porcelain polishing systems is recommended to ensure optimal surface quality for dental restorations.
• Oven glazing remains a benchmark for achieving the highest quality porcelain surface finish, according to SEM analysis.