ELIZA

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385944 occurrences (No.46 in the rank) during 5 years in the PubMed. [cache]

384) Specimens of zirconia ceramic pieces were divided into 11 groups according to surface treatments as follows: one control group (no treatment), one air abrasion group, and nine laser groups (Nd: YAG irradiation).

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PMID:23828494 DOI:10.1007/s10103-013-1381-7

2015 Lasers in medical science

* Effect of Nd: YAG laser irradiation on surface properties and bond strength of zirconia ceramics.

- This study investigated the effect of neodymium-doped yttrium aluminum garnet (Nd: YAG) laser irradiation on surface properties and bond strength of zirconia ceramics. Specimens of zirconia ceramic pieces were divided into 11 groups according to surface treatments as follows: one control group (no treatment), one air abrasion group, and nine laser groups (Nd: YAG irradiation). The laser groups were divided by applying with different output power (1, 2, or 3 W) and irradiation time (30, 60, or 90 s). Following surface treatments, the morphological characteristics of ceramic pieces was observed, and the surface roughness was measured. All specimens were bonded to resin cement. After, stored in water for 24 h and additionally aged by thermocycling, the shear bond strength was measured. Dunnett's t test and one-way ANOVA were performed as the statistical analyses for the surface roughness and the shear bond strength, respectively, with α = .05. Rougher surface of the ceramics could be obtained by laser irradiation with higher output power (2 and 3 W). However, cracks and defects were also found on material surface. The shear bond strength of laser groups was not obviously increased, and it was significantly lower than that of air abrasion group. No significant differences of the shear bond strength were found among laser groups treated with different output power or irradiation time. Nd: YAG laser irradiation cannot improve the surface properties of zirconia ceramics and cannot increase the bond strength of the ceramics. Enhancing irradiation power and extending irradiation time cannot induce higher bond strength of the ceramics and may cause material defect.

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(9)10 than	(23)4 differences	(38)2 III	(52)2 interventions
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--- WordNet output for group --- =>一団にする, 集める, 分派, 集団, グループ, 分類する, 演奏家グループ, 集まる, 分ける Overview of noun group The noun group has 3 senses (first 2 from tagged texts) 1. (1345) group, grouping -- (any number of entities (members) considered as a unit) 2. (1) group, radical, chemical group -- ((chemistry) two or more atoms bound together as a single unit and forming part of a molecule) 3. group, mathematical group -- (a set that is closed, associative, has an identity element and every element has an inverse) Overview of verb group The verb group has 2 senses (first 2 from tagged texts) 1. (4) group -- (arrange into a group or groups; "Can you group these shapes together?") 2. (1) group, aggroup -- (form a group or group together) --- WordNet end ---