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Does the application of surface treatments in different sintering stages affect flexural strength and optical properties of zirconia?
Author(s) -
KurtulmusYilmaz Sevcan,
Önöral Özay,
Aktore Huseyin,
Ozan Oguz
Publication year - 2020
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12552
Subject(s) - flexural strength , cubic zirconia , materials science , sintering , affect (linguistics) , composite material , psychology , ceramic , communication
Objective To investigate the influence of surface treatments conducted in presintering and postsintering stages on flexural strength and optical properties of zirconia. Materials and methods Specimens were milled from partially sintered zirconia blocks in different geometries and divided into three main groups as presintered, postsintered, and control groups. Test groups were further divided into three subgroups (n = 10) according to the surface treatments conducted (grinding, Er,Cr:YSGG laser irradiation, air‐borne particle abrasion [APA]). Four‐point flexural strength ( σ ) test and Weibull analysis were conducted. Color differences (Δ E 00 ) and translucency parameter ( TP ab ) were calculated with a spectrophotometer. Surfaces of specimens were scrutinized under FESEM. Data were statistically analyzed. Results Postsintered groups exhibited higher σ values ( P < .05). Within all groups, highest and lowest σ values were detected at postsintered and presintered APA groups, respectively ( P < .05). All Δ E 00 values were above the perceptibility threshold (Δ E 00 > 0.8). Higher TP ab values were obtained and deeper scratches were observed in presintered groups. Conclusions Surface treatments performed at postsintering stage had a favorable effect on the flexural strength of all specimens. Surface treatments performed before sintering increased translucency and caused higher Δ E 00 values. Clinical significance Surface treatments performed at different sintering stages can alter mechanical and optical properties of zirconia.