Surface structure and mechanical properties of impaction-modified Y-TZP
Artikel i vetenskaplig tidskrift, 2014

Objectives. The objectives of the study were to describe the surface structure and the chemical surface composition of Y-TZP ceramics produced by using the modified additive technique and to evaluate the flexural strength of Y-TZP with or without surface modification and with different pretreatments: etching before or after sintering combined with or without an adhesive cement system. Methods. Y-TZP discs were used for surface analysis (n=48) and for biaxial flexural strength testing (n= 200). The specimens were divided into groups depending on the cementation surface of Y-TZP: unmodified, sandblasted or glass-modified Y-TZP surfaces, and according to the production process: etching before or after sintering. Results. The surface structure and the chemical composition of glass-modified Y-TZP differ; a rougher surface and phase transformation was identified compared to unmodified Y-TZP. The unmodified Y-TZP groups showed significantly higher flexural strength compared to the glass-modified groups (p <0.001) and showed increased flexural strength after sandblasting (p <0.001). Furthermore, by adding cement to the surface, the value increased even further in comparison with the sandblasted non-cemented specimens (p <0.01). After thermocycling, however, the cement layer on the unmodified and the sandblasted surfaces had air pockets and regions with loose cement. Signcance. A rougher surface structure, superficial glass remnants and a higher content of m-phase was present in the cementation surface of glass-modified Y-TZP. The glass modification creates a bondable cementation surface that is durable. By etching the glass-modified Y-TZP before sintering, a more homogenous surface is created compared to one that is etched after sintering.

Dental ceramics

bond

Yttria-

Compressive strength

stabilized zirconia

strength

resin cement

Dental bonding

clinical-performance

fracture-toughness

ceramic restorations

Dental cements

oxide

Materials testing

selection

dental prostheses

flexural strength

Författare

E. Papia

Malmo University Faculty of Odontology

Ryo Jimbo

Malmo University Faculty of Odontology

B. R. Chrcanovic

Malmo University Faculty of Odontology

Martin Andersson

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

P. V. von Steyern

Malmo University Faculty of Odontology

Dental Materials

0109-5641 (ISSN)

Vol. 30 808-816

Ämneskategorier

Materialteknik

Odontologi

DOI

10.1016/j.dental.2014.05.002