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“Polishing vs Glazing of Zirconia” A study from Boston University.

Dear Dental Professional:

A recent Boston University study, by Dr. D. Nathanson, published in the Feb. 2011 issue of the IADR. reported polishing zirconia vs. glazing resulted in less wear. “At 600,000 strokes, the polished zirconia caused significantly less wear to (human) enamel than either the glazed zirconia, Ceramco porcelain, or Cerec Mark II. The polished zirconia (surface) remained unchanged, but the glazed zirconia showed showed significant loss of the glazed layer.”

While DVA’s Zircon-Brite was in fact used in the polishing of the zirconia and porcelain materials assisting in the completion of this Boston University study, it is not mentioned within the abstract. Please scroll down for the abstract.

1650 Human Enamel Wear Against Four Dental Ceramics In Vitro

IADR 2011
Friday, March 18, 2011

G. BASUNBUL, and D. NATHANSON, Dept of Restorative Sciences Biomaterials, Boston University, Boston, MA

Full contoured zirconia crown is a newly developed restorative concept.
Objective: To assess the wear effect of zirconia on human enamel in vitro.
Materials and Methods: Ten rectangular bars (10 x 5 x 3 mm) were prepared from the following ceramic materials: a) Polished Zirconia (Weiland), b) Glazed Zirconia (Weiland), c) Polished Porcelain (Ceramco 3) and d) Polished Porcelain blocks (Mark II, Vita). The bars were mounted in a wear simulator machine. Enamel specimens (2 x 2 x 5 mm) were sectioned from freshly extracted natural teeth using ISOMET 2000 Precision saw and attached to metallic rods, loaded under a constant load of 400 g and tested in reciprocating movements (6 mm travel distance) against ceramic bars in water for 60,000 and 600,000 strokes. Wear was determined by measuring loss of enamel height using digital micrometer (Mitutoyo). Ceramic loss was assessed using an optical microscope with an electronic micrometer.

Results: One-Way ANOVA (at P=0.05) and Tukey test were used to analyze the data.

Mean height loss of enamel against ceramic groups in microns is shown in table 1. Mean height loss of ceramics in microns is shown in table 2.

PolishedGlazed Polished CeramcoPolished CEREC Mark
ZirconiaZirconia3II
60,000 62(26.2)
121 (47.7)N/A647(246)
600,000 77(35)1126(315.1)1424(280.2)685(213.9)

PolishedGlazedPolished CeramcoPolished CEREC Mark
ZirconiaZirconia3II
60,000 0(0)25.1(8.6)N/A2.8(2.2)
600,000 0(0)162.8(40.9)88(10.2)24.5(5.8)

Conclusion: At 600,000 strokes, the polished zirconia caused significantly less wear to enamel than either the glazed zirconia, Ceramco porcelain or CEREC Mark II. Polished and glazed zirconia caused significantly less wear than CEREC Mark II after 60,000 strokes. The polished zirconia remained unchanged, but the glazed zirconia showed significant loss of the glaze layer.

ZIRCON-BRITE is available in a 20 gr jar and Individual brushes loaded with Zircon-Brite.

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800.228.6696 to Order Today!

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