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329) Dense cross patterns (s < 90 μm) produce the highest increase of bond strengths as compared to control group whereas light ones (s > 90 μm) give rise to smaller improvements of the bond strength.

--- ABSTRACT ---

PMID:24249356 DOI:10.1007/s10103-013-1491-2

2015 Lasers in medical science

* Ultrashort pulsed laser conditioning of human enamel: in vitro study of the influence of geometrical processing parameters on shear bond strength of orthodontic brackets.

- The surfaces of 63 extracted premolar teeth were processed with intense ultrashort laser pulses (λ = 795 nm; pulse duration, 120 fs; repetition rate, 1 kHz) to produce cross patterns with different pitches (s) in the micrometer range in order to evaluate the influence of such microstructures on the shear bond strengths of orthodontic brackets to enamel. The samples were classified in nine groups corresponding to the control group (raw samples) and eight different laser-processed groups (cross patterns with s increasing from 15 to 180 μm). Brackets were luted with Transbond(TM) XT adhesive resin to all the samples; after 72 h, they all were submitted to strength test in a universal testing machine. Additionally, a third of the samples underwent morphological analysis of the debonded surface by means of scanning electron microscope microscopy and an analysis of the failure mode based on the adhesive remnant index. The results showed that enamel microstructuring with ultrashort laser pulses remarkably increase the bond strength of brackets. Dense cross patterns (s < 90 μm) produce the highest increase of bond strengths as compared to control group whereas light ones (s > 90 μm) give rise to smaller improvements of the bond strength. A strong correlation of this behavior with the predominant failure mode in both scenarios was found. So far, the best compromise between suitable adhesive efficiency, processing time minimization, and enamel surface preservation suggests the performance of cross patterns with pitches in the order of 90 μm.

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--- WordNet output for increase --- =>大きくなる, を増す, 増大させる, 強まる, 増加, 増える, 増やす Overview of noun increase The noun increase has 5 senses (first 5 from tagged texts) 1. (49) addition, increase, gain -- (a quantity that is added; "there was an addition to property taxes this year"; "they recorded the cattle's gain in weight over a period of weeks") 2. (21) increase -- (a change resulting in an increase; "the increase is scheduled for next month") 3. (7) increase, increment, growth -- (a process of becoming larger or longer or more numerous or more important; "the increase in unemployment"; "the growth of population") 4. (3) increase, increment -- (the amount by which something increases; "they proposed an increase of 15 percent in the fare") 5. (3) increase, step-up -- (the act of increasing something; "he gave me an increase in salary") Overview of verb increase The verb increase has 2 senses (first 2 from tagged texts) 1. (86) increase -- (become bigger or greater in amount; "The amount of work increased") 2. (61) increase -- (make bigger or more; "The boss finally increased her salary"; "The university increased the number of students it admitted") --- WordNet end ---