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Influence of processing variables on scratch and shrinkage behaviors and translucency of dental zirconia
Author(s) -
Hong Lijuan,
Lee DaJeong,
Yoon HyungIn,
Han JungSuk,
Kim DaeJoon
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13351
Subject(s) - materials science , sintering , machinability , shrinkage , scratch , composite material , compaction , cubic zirconia , porosity , metallurgy , ceramic , machining
Scratch tests were performed on porous 3 mol% Y 2 O 3 ‐stabilized zirconia dental blocks to relate compaction processing and partial sintering temperature to shrinkage and machinability of the blocks and microstructures and transmittance after full sintering. Scratch hardness of the blocks varied with increasing loads, and the variation was related to the sequential events of densification, densification and cleaving, disruption of the densified region, and chipping and longitudinal cracking. The shrinkage during final sintering was inversely proportional to the compact pressure and temperature with compact pressure having a greater impact. In contrast, the transmittance of fully sintered blocks depended largely on the partial sintering temperature because it governed the number and size of pores after completion of the sintering. Based on the influence of the variable on scratch hardness, a scratch response measure that possibly reflects the machinability of porous CAD/CAM blocks was proposed.