Effects of cementation surface modifications on fracture resistance of zirconia

Srikanth, Ramanathan, Kosmac, Tomaz, Della Bona, Alvaro, Yin, Ling, and Zhang, Yu (2015) Effects of cementation surface modifications on fracture resistance of zirconia. Dental Materials, 31 (4). pp. 435-442.

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Abstract

Objectives: To examine the effects of glass infiltration (GI) and alumina coating (AC) on the indentation flexural load and four-point bending strength of monolithic zirconia.

Methods: Plate-shaped (12 mm × 12 mm × 1.0 mm or 1.5 or 2.0 mm) and bar-shaped (4 mm × 3 mm × 25 mm) monolithic zirconia specimens were fabricated. In addition to monolithic zirconia (group Z), zirconia monoliths were glass-infiltrated or alumina-coated on their tensile surfaces to form groups ZGI and ZAC, respectively. They were also glass-infiltrated on their upper surfaces, and glass-infiltrated or alumina-coated on their lower (tensile) surfaces to make groups ZGI2 and ZAC2, respectively. For comparison, porcelain-veneered zirconia (group PVZ) and monolithic lithium disilicate glass–ceramic (group LiDi) specimens were also fabricated. The plate-shaped specimens were cemented onto a restorative composite base for Hertzian indentation using a tungsten carbide spherical indenter with a radius of 3.2 mm. Critical loads for indentation flexural fracture at the zirconia cementation surface were measured. Strengths of bar-shaped specimens were evaluated in four-point bending.

Results: Glass infiltration on zirconia tensile surfaces increased indentation flexural loads by 32% in Hertzian contact and flexural strength by 24% in four-point bending. Alumina coating showed no significant effect on resistance to flexural damage of zirconia. Monolithic zirconia outperformed porcelain-veneered zirconia and monolithic lithium disilicate glass–ceramics in terms of both indentation flexural load and flexural strength.

Significance: While both alumina coating and glass infiltration can be used to effectively modify the cementation surface of zirconia, glass infiltration can further increase the flexural fracture resistance of zirconia.

Item ID: 41840
Item Type: Article (Research - C1)
ISSN: 1879-0097
Keywords: ceramic restorative materials, surface modification, zirconia, graded zirconia, alumina coating, indentation flexural load, flexural strength
Funders: United States National Institute of Dental and Craniofacial Research (USNIDCR), National Science Foundation (NSF)
Projects and Grants: USNIDCR 2R01 DE017925, NSF CMMI-0758530
Date Deposited: 08 Dec 2015 18:07
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1105 Dentistry > 110501 Dental Materials and Equipment @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 100%
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