Correlation between surface roughness and fracture toughness of dental porcelain treated with different polishing materials and glazing techniques

Sahib Mansoor, Nidhal

	Correlation between surface roughness and fracture toughness of dental porcelain treated with different polishing materials and glazing techniques
AL-TAQANI
Article 1, Volume 23, Issue 5, 2010, Pages 30-40
Author
Nidhal Sahib Mansoor
Abstract
The purpose of this study was to measure the correlation between surface roughness and fracture toughness of porcelain restorations, after treated with different polishing materials and glazing techniques. Seventy metal-ceramic specimens were fabricated and divided into seven groups according to the type of surface treatment of porcelain. The surface roughness averages "Ra" of the specimens have been determined using the Profilometer device. The fracture toughness (Klc) of each specimen was measured using a Macro- Hardness Vickers Tester device supplied with a 9.8 N load indenter applied for (15 sec.) followed by measuring half diagonal of the fracture porcelain area and cracks length. Statistical analysis indicated high significant differences among the test groups. The study concluded that, Polishing and glazing of porcelain is necessary for porcelain restorations, and the surface roughness correlated the strength of porcelain materials. Polished porcelain with (rubber wheel and polishing paste) can be considered a good alternative to applied glaze of porcelain restorations which is characterized by time consuming and sensitive technique. Moreover, autoglazing porcelain followed by polishing or without polishing, proved to be disadvantageous since it increased surface roughness and lowered the fracture toughness of porcelain. Polishing +applied glaze can be used to get best surface smoothness and the best fracture toughness.

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