In her article, published in the 2013/2014 issue of Dentistry Today, entitled, “Focus on: Monolithic Crowns,” Dr. Rella Christensen, PhD, who leads TRAC Research Laboratory, which is devoted to clinical research in oral microbiology and dental restorative concepts, offers an insightful summarizing overview of the ongoing impact of monolithic restorations.
In the article, Dr. Christensen states that “monolithic crowns, which are made of one, uniform material, are taking over in the U.S. Today, major dental laboratories are reporting orders for lithium disilicate and zirconia restorations higher than for PFM’s.
The article asks the question, “Have any clinical cautions been noted?” Which generated the following response: “It is apparent that the glazes used on both materials will not be long lasting.” Interestingly, it was reported that as the glaze deteriorates, it becomes rough and imparts increasingly more abrasion to opposing dentition.
Dr. Christensen, offers a summarizing statement that “In the future, surfaces will probably be polished rather than glazed.”
Page 2 of the June 2014, Vol. 7; Issue 6 publication published and distributed by Clinicians Report, in response to the question, “Should BruxZir and e.maxCAD be final polished or glazed?” states that “After only six months, it was evident the glazes would not last long.”
Al-Wahadni and Martin also offer several statements in the Canadian Dental Association publication; issue 8; pointing out that “Many ceramists prefer polishing instead of glazing, to control the surface lustre,” and “Rosentiel et al found that the fracture toughness of polished porcelain was greater than that of glazed porcelain.”
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