* Effect of LED-mediated-photobiomodulation therapy on orthodontic tooth movement and root resorption in rats.
- The aim of this experimental study was to evaluate the effects of light-emitting diode-mediated-photobiomodulation therapy (LPT), on the rate of orthodontic tooth movement (TM) and orthodontically induced root resorption, in rats. Twenty male 12-week-old Wistar rats were separated into two groups (control and LPT) and 50 cN of force was applied between maxillary left molar and incisor with a coil spring. In the treatment group, LPT was applied with an energy density of 20 mW/cm(2) over a period of 10 consecutive days directly over the movement of the first molar teeth area. The distance between the teeth was measured with a digital caliper on days 0 (T0), 10 (T1), and 21 (T2) on dental cast models. The surface area of root resorption lacunae was measured histomorphometrically using digital photomicrographs. Mann-Whitney U and Wilcoxon tests were used for statistical evaluation at p < 0.05 level. TM during two different time intervals (T1-T0 and T2-T1) were compared for both groups and a statistically significant difference was found in the LPT group (p = 0.016). The TM amount at the first time period (1.31 ± 0.36 mm) was significantly higher than the second time period (0.24 ± 0.23 mm) in the LPT group. Statistical analysis showed significant differences between two groups after treatment/observation period (p = 0.017). The magnitude of movement in the treatment group was higher (1.55 ± 0.33 mm) compared to the control group (1.06 ± 0.35 mm). Histomorphometric analysis of root resorption, expressed as a percentage, showed that the average relative root resorption affecting the maxillary molars on the TM side was 0.098 ± 0.066 in the LPT group and 0.494 ± 0.224 in the control group. Statistically significant inhibition of root resorption with LPT was determined (p < 0.001) on the TM side. The LPT method has the potential of accelerating orthodontic tooth movement and inhibitory effects on orthodontically induced resorptive activity.
=>幹部, おえら方
Overview of adj higher
The adj higher has 2 senses (first 2 from tagged texts)
1. (10) higher -- (advanced in complexity or elaboration; "higher finance"; "higher mathematics")
2. (1) higher -- (of education beyond the secondary level; "higher education"; "higher learning")
Overview of adj high
The adj high has 7 senses (first 5 from tagged texts)
1. (134) high -- (greater than normal in degree or intensity or amount; "a high temperature"; "a
high price"; "the high point of his career"; "high risks"; "has high hopes"; "the river is high";
"he has a high opinion of himself")
2. (51) high -- ((literal meaning) being at or having a relatively great or specific elevation or
upward extension (sometimes used in combinations like `knee-high'); "a high mountain"; "high
ceilings"; "high buildings"; "a high forehead"; "a high incline"; "a foot high")
3. (10) eminent, high -- (standing above others in quality or position; "people in high places";
"the high priest"; "eminent members of the community")
4. (7) high, high-pitched -- (used of sounds and voices; high in pitch or frequency)
5. (2) high, in high spirits -- (happy and excited and energetic)
6. gamey, gamy, high -- ((used of the smell of meat) smelling spoiled or tainted)
7. high, mellow -- (slightly and pleasantly intoxicated from alcohol or a drug (especially
marijuana))
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