Wear of three dental composites under different testing conditions

Abstract

Although a great effort has been made to date with research on in vitro wear simulation testing, it is difficult to identify the relationship between the results of in vitro testing and in vivo observations. An intensive study into wear mechanisms is necessary for wear testing simulation. The objective of this research was to study the wear behaviour of three selected dental composites under different wear conditions to provide a more rational explanation for their wear mechanisms. Two typical wear conditions, two- and three-body wear, were conducted on the composites. The results showed that the wear losses had different rankings between two wear conditions. It is therefore unreliable to predict the clinical performance merely by wear loss ranking from in vitro wear testing. Further analysis on the wear surfaces indicated that three dental composites experienced different wear mechanisms under different wear conditions. It is concluded that in vitro analysis of wear mechanisms may lead to a better understanding of in vivo failure patterns. Similar wear mechanisms should be the premise for any correlation between the results of in vitro and in vivo studies.

<i>In vitro</i> evaluation of the wear resistance of composite resin blocks for CAD/CAM

“…delamination. The delaminated zone was the loss of very superficial deformed layer after micro-cracked formation 20,21) . The morphology of the CER surface after three-body wear was to some extent comparable to the one after two-body wear.…”

Influence of filler loading on the two‐body wear of a dental composite

“…The current trend is to minimize filler size and to maximize filler load to satisfy all the requirements of dental composites (Bayne, Taylor & Heymann, 1992; Ferracane, 1995; Jaarda & Lang, 1997). Some in vitro wear test results under three‐body abrasive conditions have demonstrated that the addition of inorganic fillers can improve the wear resistance of dental composites (Raadal, 1978; Torii et al ., 1999; Hu et al ., 2001). At first sight, the results of the current investigation may appear to contradict these general conclusions.…”

Comparative Evaluation of Three Different Types of Tooth Brush on Surface Abrasion of Enamel & Nanohybrid Composite - An in Vitro Study

“…39 Previous studies carried out by Kumar et al, Hila Hajizadeh et al, Zuryati et al, Kaur and Nandlal have evaluated abrasion produced on dental materials but these studies also had the limitation that the plausible role of saliva in abrasion process was not evaluated. 40,41,42 Abrasion is of multifactorial etiology and numerous factors affect the abrasion process & there are still probabilities that numerous other factors may directly or indirectly influence abrasion process. This in vitro study was performed for a short duration; hence, the role of toothbrush and toothpaste for long term use cannot be documented.…”