Cracks formed by Vickers indentation adjacent to the interface in bonded dental ceramics with various marginal angles

Abstract

The objective of this study was to assess the influence of the ceramic marginal angle on the length and nature of indentation cracks in ceramics near the ceramic/resin bonded interface. Disks of a leucite-reinforced ceramic or a diopside-based glass-ceramic bonded to a resin composite were sectioned so that the ceramic marginal angles were 45, 60, and 90°. Vickers indentations were placed in the ceramic at various distances from the bonded interface. The lengths of the indentation cracks running near parallel to the interface were measured and the orientation of crack propagation was characterized. The crack length and orientation were significantly affected by the distance from the interface and by the marginal angle, respectively. The crack length extended as the distance from the interface was shortened. Smaller marginal angles resulted in more oblique cracks. The toughness of the ceramic affected the indentation crack length, shape, and direction.

ADM guidance-Ceramics: all-ceramic multilayer interfaces in dentistry

“…Crack deviations close to the veneer/framework interface, especially when a residual stress field is present, becomes a matter of interest [95]. Using different indenters, such as Knoop or Berkovich, will allow for targeted orientation of the crack initiation process [94]. Inden- tation analysis can be easily performed on distinct planes [96].…”

“…A surface indentation (e.g., made with Vickers indenter) initiates and drives cracks into a plain ceramic surface thereby allowing analysis of the length, nature and orientation of the crack paths [94]. Crack deviations close to the veneer/framework interface, especially when a residual stress field is present, becomes a matter of interest [95].…”

The mechanical behavior of the material-tissue and material-material interface in dental reconstructions

“…Basically, a surface indentation (e.g. using Vickers indenters) initiates and drives cracks into a plain ceramic surface thereby allowing analysis of the length, nature and orientation of the respective crack paths [175]. Crack deviations close to the interface, especially in a residual stress field, became a matter of interest [176].…”

“…Crack deviations close to the interface, especially in a residual stress field, became a matter of interest [176]. Indenter modifications using Knoop or Berkovich indenters allow for targeted orientation of the crack initiation process [175]. Indentation analysis can be easily performed on individual plane orientations [177].…”