Articles

In previous studies it has been demonstrated that the Er:YAG laser can be used to prepare cavities efficiently and without thermal damage to the adjacent dental hard and soft tissues. To investigate the patients' response to Er:YAG laser preparation of teeth, a prospective clinical study was performed in five dental hospitals.

The aims of this study were (1) to conduct a literature search and systematically evaluate the additional therapeutic effects of pulsed Nd:YAG or diode laser use in patients with periodontitis, (2) to assess evidence supporting the additional benefit of laser-mediated periodontal treatment in conjunction with scaling and root planning (SRP) (not as monotherapy), and (3) to interpret the evidence presented in retrieved publications.

In recent years, various laser systems have been introduced into the field of laser-assisted endodontic therapy. The aim of this study was to evaluate the bactericidal effect of Nd:YAG, Er:YAG, Er,Cr:YSGG laser radiation, and antimicrobial photodynamic therapy (aPDT) in experimentally infected root canals compared with standard endodontic treatment of 5.25% sodium hypochlorite (NaClO) irrigation.

Low level laser therapy (LLLT) affects various biological processes, and it is said that the non-coherent light of the light-emitting diode (LED) has a similar action. The purpose of this study was to examine the effects of LED light on the proliferation and differentiation of osteoblasts-like MC3T3-E1 cells cultured in osteogenic differentiation medium (ODM) over the long term. Cells were irradiated with red LED light of 630 nm at three doses; 0.5J/cm², 1.5J/cm² or 3.0J/cm² for the cell proliferation activity assay, and at 0.5J/cm² for the osteogenic differentiation activity assay. The former activity was checked by counting the number of viable cells using Trypan blue dye. The latter activity was evaluated by alkaline phosphatase (ALP) staining and examining the mRNA expression of the osteopontin (OPN) gene using real-time quantitative PCR. The number of viable MC3T3-E1 cells showed a tendency to increase after the irradiation at all three energy densities in comparison with a non-irradiation group (control group). In particular, there was a remarkable 3.34-fold increase in the group irradiated with 3.0J/cm² on day 7 after starting the culture. On culture day 15, there was a tendency for the red LED irradiation group (0.5 J/cm²) to exhibit more staining for ALP than the control group, and the expression of OPN was significantly higher in the irradiation group on culture day 16. In conclusion, low level red LED light can enhance MC3T3-E1 cell proliferation and osteogenic differentiation when the cells are cultured for a relatively long time.

Temporomandibular joint disorder (TMD) is a general term for diseases of the temporomandibular joint and orofacial muscles. In this study, we tested whether laser acupuncture was effective for the treatment of TMD.

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