Effect of low-level laser therapy on tooth-related pain and somatosensory function evoked by orthodontic treatment

Low-level laser therapy(LLLT) may have an effect on the pain associated with orthodontic treatment. The aim of this study was to evaluate the effect of LLLT on pain and somatosensory sensitization induced by orthodontic treatment. Forty individuals(12–33 years old; mean ± standard deviations: 20.8 ± 5.9 years) scheduled to receive orthodontic treatment were randomly divided into a laser group(LG) or a placebo group(PG)(1:1). The LG received LLLT(810-nm gallium-aluminium-arsenic diode laser in continuous mode with the power set at 400 mW, 2 J·cm–2) at 0 h, 2 h, 24 h, 4 d, and 7 d after treatment, and the PG received inactive treatment at the same time points. In both groups, the non-treated side served as a control. A numerical rating scale(NRS) of pain, pressure pain thresholds(PPTs), cold detection thresholds(CDTs), warmth detection thresholds(WDTs), cold pain thresholds(CPTs), and heat pain thresholds(HPTs) were tested on both sides at the gingiva and canine tooth and on the hand. The data were analysed by a repeated measures analysis of variance(ANOVA). The NRS pain scores were significantly lower in the LG group(P = 0.01). The CDTs,CPTs, WDTs, HPTs, and PPTs at the gingiva and the PPTs at the canine tooth were significantly less sensitive on the treatment side of the LG compared with that of the PG(P < 0.033). The parameters tested also showed significantly less sensitivity on the nontreatment side of the LG compared to that of the PG(P < 0.043). There were no differences between the groups for any quantitative sensory testing(QST) measures of the hand. The application of LLLT appears to reduce the pain and sensitivity of the tooth and gingiva associated with orthodontic treatment and may have contralateral effects within the trigeminal system but no generalized QST effects. Thus, the present study indicated a significant analgesia effect of LLLT application during orthodontic treatment.Further clinical applications are suggested.

Low-level laser therapy enhances the number of osteocytes in calvaria bone defects of ovariectomized rats

Background : Osteoporosis can make bone repair difficult. Low-level laser therapy( LLLT) has been shown to be a promising tool for bone neoformation. This study aimed to analyze the effect of LLLT on calvaria bone defects of ovariectomized rats using stereology. Methods : Fifty-four Wistar rats were subjected to bilateral ovariectomy, and bone defects were created in calvaria after 150 days. The animals were divided into nine groups(n = ?6 per group), and 24 hours after the bone defects were created they received three, six or 12 sessions of LLLT at 0, 20 or 30 J/cm 2, using a 780-nm low-intensity GaAlAs laser. One-way ANOVA followed by Tukey ' s post hoc test was used for data processing. A difference of P < 0.05 was considered statistically significant. The parameters evaluated were osteocyte density( Nv_(ost)), total osteocyte number( Nto ost), trabecular surface density( Sv_t), and trabecular surface area( Sa_t). Results : Data obtained showed that Nto ost, Sv t, and Sa t in group G2 rats were significantly different from G1(0 J/cm^2)( P < 0.05). Compared to group G4, G5 presented higher values for the parameters Sv t and Sa t, and G6 presented significantly higher values for almost all the analyzed parameters( Nv _(ost), Nto_(ost), Sv_t, and Sa t)( P < 0.05). Compared to group G7, G8 showed a higher value only for the parameter Sa t, and G9 showed significantly higher values for parameters Nv ost, Nto ost, Sv_t, and Sa_t. Conclusion : We conclude that LLLT stimulated bone neoformation and contributed to an increase in the total number of osteocytes, especially with a laser energy density of 30 J/cm^2 given for six and 12 sessions.

Induction of Autologous Bone-Marrow Stem Cells by Low-Level Laser Therapy Has Beneficial Effects on the Kidneys Post-Ischemia-Reperfusion Injury in the Rat

Acute renal failure has a 50% - 80% mortality rate. Currently, treatment options for this life-threatening disease are limited. Low-level laser therapy (LLLT) has been found to modulate biological activity. The aim of the present study was to investigate the possible beneficial effects of laser application to stem cells in the bone marrow, on the kidneys of rats that had undergone ischemia-reperfusion injury (IRI). IRI was induced by occlusion of the renal artery to 3- and 7-month-old rats for 15 or 30 minutes. In an additional experiment IRI was applied to both kidneys for 20 min each in 2-3-month-old rats. Rats were then divided randomly into two groups of control and laser-treated. Laser therapy (Ga-Al-As 810 nm, 200 mW output for 2 min) was applied to the bone marrow 1 and 7 days post-IRI to the kidneys, and rats were sacrificed 2 weeks later. Histomorphometry and immunohistochemistry were performed on kidney sections and blood markers for kidney function. Quantitative histomorphometric analysis revealed a reduction in dilatation of the renal tubules, restored structural integrity of the renal tubules, and reduced necrosis in the laser-treated rats as compared to the control, non-laser-irradiated group. C-kit positive cell density in kidneys post-IRI and laser-treatment was significantly (p = 0.015) 3.2-fold higher compared to the control group. Creatinine and blood urea nitrogen content were significantly lower in the laser-treated rats as compared to control. It is concluded that LLLT application to the bone marrow (BM) causes a significant increase in the density of mesenchymal stem cells in the kidneys post-IRI, probably by induction of stem cells in the BM, which subsequently migrate to the IRI kidney, significantly reducing the pathological features of the kidney and increasing kidney function post IRI.

Effects of Kangfuxin Solution (康复新液) Combined with Low-level Laser on Cytokines and Immune Function in Patients with Radiation-induced Oral Mucositis

Objective:To investigate the effect of Kangfuxin Solution(康复新液)combined with low-level laser therapy(LLLT)on cytokines and immune function in patients with radiation-induced oral mucositis.Methods:There were 84 nasopharyngeal carcinoma patients with oral mucositis after intensity-modulated radiation therapy(IMRT)were randomly divided into the control group(CG)and the observation group(OG),with 42 cases in each group.The CG was given LLLT,and the OG was treated with Kangfuxin Solution in addition to LLLT for 10 consecutive days.The healing time of oral mucosa,mucositis grading,oral pain scores,cytokines(interleukin-6,interleukin-1βand tumor necrosis factor-α)and T lymphocyte subsets were compared between the 2 groups before and after treatment.Results:The healing time of oral mucosa in the OG was(6.8±1.4)d,which was significantly shorter than(8.6±1.9)d in the CG(t=4.943,P<0.01).After treatment,the grading of oral mucositis in the OG was better than that in the CG,with a statistically significant difference(Z=2.942,P<0.05).The oral pain scores of the OG was lower than that in the CG at different time points after treatment,and the difference was statistically significant(t=8.207,11.017,P<0.01).After treatment,the levels of IL-6,IL-1βand TNF-αin peripheral blood of the OG were significantly lower than those in the CG(t=5.217,2.775,4.053,P<0.01).There were statistically significant differences in CD4+,CD8+and CD4+/CD8+between the OG and the CG after treatment(t=5.692,6.093,3.658,P<0.01).Conclusion:Kangfuxin Solution combined with LLLT can significantly shorten the healing time of oral mucosal,reduce the grading of oral mucositis,relieve oral pain,reduce inflammatory response and improve the immune function of patients.

Effect of autologous mesenchymal stem cells induced by low level laser therapy on cardiogenesis in the infarcted area following myocardial infarction in rats

In this study, we investigated the hypothesis that photobiostimulation by low-energy laser therapy (LLLT) applied to the bone marrow (BM) of myocardial infarcted rats may attenuate the scarring processes that follow myocardial infarction (MI). Wistar rats underwent experimental MI. LLLT (Ga-Al-As diode laser) was applied to the BM of the exposed tibia at different time intervals post-MI (4 hrs, 48 hrs and 5 days). Sham-operated infarcted rats served as control. Infarct size was significantly reduced (55%) in the laser-treated rats as compared to the control non-treated rats, at 2 weeks post-MI. A significant 3-fold increase was observed in the density of desmin immunopositive stained cells 14 days post-MI in the infarcted area of the laser-treated rats as compared to the non-laser-treated controls. The electron microscopy from the control infarcted rat hearts revealed a typical interphase area between the intact myocardium and the infarcted area, with conspicuous fibroblasts with collagen deposition dispersed among them. In rats that were laser treated (to BM), the interphase zone demonstrated cells with different intracellular structures. There was also a significant increase in the percentage of c-kit positive cells and macrophages in the circulating blood of the laser treated rats as compared to control non treated ones. In the majority of the cells clusters of myofibrils anchored to well-developed Z-lines and structures resembling the morphological characteristics of mature intact cardiomyocytes were evident. In conclusion, LLLT to the BM of rats post-MI induces cardiogenesis mainly at the borders of the infarcted area in the heart.

Photobiomodulation with Super-Pulsed Laser Shows Efficacy for Stroke and Aphasia: Case Studies

Background: Brain disorders have become more and more common today, due to both the aging population and the ever-expanding sports community. However, a new therapeutic technology called photobiomodulation (PBM) is giving hope to thousands of individuals in need. Traumatic brain injury (TBI), dementia, post traumatic stress (PTSD) and attention deficit (ADD) disorders are in many cases quickly and safely improved by PBM. PBM employs red or near-infrared (NIR) light (600 - 1100 nm) to stimulate healing, protect tissue from dying, increase mitochondrial function, improve blood flow, and tissue oxygenation. PBM can also act to reduce edema, increase antioxidants, decrease inflammation, protect against apoptosis, and modulate the microglial activation state. All these effects can occur when light is delivered to the head, and can be beneficial in both acute and chronic brain conditions. Methods: In this case series, we used a high power, FDA-approved superpulsed laser system applied to the head to treat four chronic stroke patients. Patients received as few as three 6 - 9 minute treatments over a one-week period. The follow up time varied, but in one case was two years. Results: Patients showed significant improvement in their speech and verbal skills. Improvements were also noticed in walking ability, limb movement, less numbness, and better vision. Conclusion: The use of PBM in stroke rehabilitation deserves to be tested in controlled clinical trials, because this common condition has no approved pharmaceutical treatment at present.

光动力疗法与半导体激光辅助治疗重度牙周炎的疗效比较

目的比较光动力疗法(PDT)与半导体激光(DL)辅助龈下刮治和根面平整术(SRP)治疗重度牙周炎的临床疗效。方法筛选成年重度牙周炎患者30例作为研究对象,采用自身对照试验,每位受试者选3个象限,每个象限各选取1颗探诊深度(PD)≥7 mm且病损情况相似的磨牙作为指数牙,共90颗,共355个位点,3颗磨牙被随机分为SRP组(单独SRP治疗,118个位点)、DL组(SRP治疗后1周进行DL辅助治疗,122个位点)、PDT组(SRP治疗后1周进行PDT辅助治疗,115个位点)。比较三组治疗前后的PD、临床附着水平(CAL)、探诊出血(BOP)阳性位点、牙周致病菌[牙龈卟啉单胞菌(P.g)、伴放线共生杆菌(A.a)、福赛斯坦纳菌(T.f)]菌量。结果治疗前SRP组、DL组、PDT组的PD分别为(7.87±0.82)、(7.97±0.72)、(7.93±0.83)mm,治疗后6周PD分别为(5.43±1.25)、(5.17±0.79)、(5.13±0.90)mm,治疗后12周PD分别为(5.07±1.05)、(4.77±0.78)、(4.73±0.83)mm;治疗前SRP组、DL组、PDT组的CAL分别为(8.37±0.49)、(8.43±0.57)、(8.40±0.62)mm,治疗后6周CAL分别为(6.17±0.75)、(5.78±0.62)、(5.73±0.64)mm,治疗后12周CAL分别为(5.83±0.61)、(5.52±0.56)、(5.47±0.57)mm。治疗前,三组PD、CAL水平比较,均无统计学差异(P>0.05)。治疗后6、12周,三组PD、CAL水平较治疗前有所改善,且DL组、PDT组的CAL均优于SRP组(P<0.05);治疗后12周,三组PD、CAL较治疗后6周略降低,但差异不具有统计学意义(P>0.05)。治疗后6周SRP组、DL组、PDT组BOP阳性位点占比分别为78.0%、67.2%、65.2%,治疗后12周,SRP组、DL组、PDT组BOP阳性位点占比分别为77.1%、62.3%、59.1%,均低于治疗前的94.1%、93.4%、94.8%,且治疗后12周DL组、PDT组BOP阳性位点占比持续下降,低于SRP组(P<0.05);但治疗后12周DL组与PDT组BOP阳性位点占比比较,差异不显著(P>0.05)。治疗后6、12周三组P.g、A.a、T.f菌量均低于治疗前,治疗后6周DL组、PDT组的P.g、A.a、T.f菌量均低于SRP组,治疗后12周DL组、PDT组的A.a、T.f菌量均低于SRP组(P<0.05);但治疗后12周,DL组与PDT组的A.a、T.f菌量比较以及三组的P.g菌量比较,均无显著差异(P>0.05)。结论PDT和DL辅助SRP治疗磨牙区重度牙周炎在短期内具有一定的疗效,且对牙周致病菌A.a、T.f有明显的抑制作用。

光生物调节诱导间充质干细胞的成骨分化

背景:间充质干细胞是从多种组织中分离出来的多能基质细胞,能够在特定的条件下分化为成骨细胞,光生物调节作为一种外部刺激能够单独或与其他诱导物联合使用加速间充质干细胞成骨分化的进程,从而为解决系列骨疾病提供新的思路。目的:综述光生物调节诱导间充质干细胞成骨分化的相关研究及机制,旨在为选用间充质干细胞作为种子细胞的骨组织工程奠定理论基础,并提出一些发展方向的建议。方法:检索中国知网、PubMed及Wed of Science数据库近年来发表的相关文献,中文检索词为“光生物调节,低功率激光,低水平激光,发光二极管,间充质干细胞,成骨分化,生物材料”;英文检索词为“Photobiomodulation,low level laser(light),light-emitting diode(LED),mesenchymal stem cell,osteogenic differentiation,Biomaterials”,最终纳入88篇文献进行分析。结果与结论:①以低水平激光和发光二极管为代表的光生物调节对于促进间充质干细胞的增殖与分化有着积极的影响。②光生物调节诱导间充质干细胞成骨分化的可行性已在细胞实验、动物实验中得到验证,一方面,光生物调节能够通过激活相关信号通路、上调成骨标志物的表达促进干细胞在体外扩增与分化;另一方面,光生物调节可以提高系统移植的干细胞体内存活率及归巢效应,缩短骨缺损愈合时间。但是光生物调节存在双相剂量效应,各项研究中激光参数、实验环境及细胞类型等要素参差不齐,使得研究结果缺乏一致性,难以推广。③光生物调节可以与生物材料、其他物理因子及药物联合使用加速干细胞成骨分化的进程。④总之,光生物调节因其无创、高效且无明显副反应等优势在医疗领域的应用逐渐广泛;近年来,其在骨组织工程中的作用也逐渐凸显,为骨缺损等疾病的治疗提供了新策略,后续研究应进一步探索光生物调节的标准化治疗参数。

半导体激光在伴有釉突的Ⅱ度根分叉病变基础治疗中的效果研究

目的:研究半导体激光联合去釉突治疗在伴有釉突的Ⅱ度根分叉病变治疗中的临床效果及其影响因素。方法:纳入存在Ⅱ型釉突的Ⅱ度根分叉病变患者24例,共48颗患牙,随机分为根面平整组(SRP组)、去釉突+SRP组(D+SRP组)、去釉突+SRP+半导体激光组(D+SRP+L组)。SRP组不去釉突直接行SRP;D+SRP组去除釉突后行SRP;D+SRP+L组去釉突后,联合使用半导体激光辅助SRP。分别于治疗前及治疗后4周、3个月比较3组患者的探诊深度(PD)、牙龈出血指数(BI)、牙龈退缩(GR)和附着丧失(CAL)。收集36颗存在Ⅱ型釉突的离体牙,随机分为以上3组,制备根片,原子力显微镜下观察3组的表面形态,测定表面粗糙度(Ra值);免疫荧光细胞迁移实验观察牙周膜成纤维细胞(hPDLFs)迁移能力;牙龈卟啉单胞菌培养观察菌落形态。结果:治疗后4周及3个月,牙周各指标改善情况,D+SRP+L组最显著,D+SRP组次之,SRP组最差(P<0.01)。原子力显微镜下测定各组表面粗糙度:D+SRP+L组最大,D+SRP组次之,SRP组最小。荧光显微镜下观察hPDLFs迁移细胞数目,D+SRP+L组迁移能力最高,组间差异具有统计学意义(P<0.01)。原子力显微镜下VPM(peak material volume)值,D+SRP组与SRP组相比无明显差异;而D+SRP+L组最低,与SRP组相比差异有统计学意义。3组菌层厚度无明显差异(P>0.05)。结论:半导体激光联合去釉突可以提高有釉突的Ⅱ度根分叉病变患牙的基础治疗效果。

Blue LED as a new treatment to vaginal stenosis due pelvic radiotherapy:Two case reports

BACKGROUND Currently,the advancement cancer treatment technology improves overall survival,however,adverse events are still a challenge for health professional.Genitourinary syndrome of menopause and vaginal stenosis are conditions that impact the quality of life of patients undergoing radiotherapy.We present two such cases in patients with previous cervical and endometrial cancer.These conditions were handled with an innovative method using an energy-based device with blue light emitting diode for concomitant vaginal and vulvar irradiation.Positive impact in clinical findings,cytologic changes,and referred symptoms were documented.CASE SUMMARY One patient diagnosed with vaginal severe vaginal stenosis with previous cervix cancer treatment and other patient diagnosed with mild stenosis with severe dyspareunia and recent endometrium cancer treatment were considered for vulvovaginal treatment with weekly blue led device and closely evaluated with repeated validated questionnaires and cytological samples.CONCLUSION This innovative technique showed an improvement in all areas of the examiner's criteria,the cytological criteria,and most bothered symptoms.

Photobiomodulation therapy for osteoarthritis: Mechanisms of action

Photobiomodulation(PBM)is a non-invasive therapeutic modality with demonstrated effects in many fields related to regenerative medicine.In the field of orthopedics,in particular,PBM at various wavelengths has demonstrated the capacity to trigger multiple biological effects associated with protective mechanisms in musculoskeletal tissues.The articles cited in this review show that devices operating close to or within the near infrared range at low intensities can provoke responses which favor the shift in the predominant catabolic microenvironment typically seen in degenerative joint diseases,especially osteoarthritis(OA).These responses include proliferation,differentiation and expression of proteins associated with stable cell cycles.Additionally,PBM can also modulate oxidative stress,inflammation and pain by exerting regulatory effects on immune cells and blocking the transmission of pain through sensory neuron fibers,without adverse events.Collectively,these effects are essential in order to control the progression of OA,which is in part attributed to exacerbated inflammation and degradative enzymatic reactions which gradually contribute to the destruction of joint tissues.PBM may offer medical experts ease of application,financial viability,efficacy and lack of serious adverse events.Therefore,it may prove to be a suitable ally in the management of mild to moderate degrees of OA.This review explores and discusses the principal biological mechanisms of PBM and how the produced effects may contribute to the amelioration of osteoarthritic progression.Literature was reviewed using PubMed and Google Scholar in order to find studies describing the mechanisms of PBM.The investigation included a combination of nomenclature such as:“photobiomodulation”,“phototherapy”,“laser therapy”,“PBM”,“osteoarthritis”,low level light therapy”,“inflammation”and“cartilage”.We considered only articles written in English,with access to the full text.

半导体激光在牙周非手术治疗的应用研究进展

慢性牙周炎是由菌斑微生物引起得慢性炎症性疾病,去除菌斑结石是牙周非手术治疗的金标准。然而彻底清创难度较大,尤其在一些复杂的解剖位点,过度刮治又可能造成健康牙骨质的丧失导致术后根面敏感。研究表明半导体激光因其波长(630~1064 nm)接近血红素和黑色素的吸收峰值,在有血液的环境中能发挥最佳性能,在口腔领域具有广泛的应用前景。在牙周非手术治疗时半导体激光有软激光疗法、光动力疗法及低能量激光疗法3种治疗模式,可单一使用也可组合使用。虽然半导体激光无法代替机械治疗去除结石,但是其通过光热效应、光化学效应、生物刺激等作用可以去除感染的牙周袋上皮、改变微循环促进创面愈合及止血止痛等。半导体激光治疗效果取决于合适的治疗剂量,需精准掌控输出强度,控制照射时间,避免引起组织的热损伤。未来还需在分子水平上对其进行广泛的研究,了解组织的反应,同时还需更多高质量、大样本的随机对照试验来规范激光在牙周炎中的使用。

Photobiomodulation provides neuroprotection through regulating mitochondrial fission imbalance in the subacute phase of spinal cord injury

Increasing evidence indicates that mitochonarial lission imbalance plays an important role in derayed neuronal cell death. Our previous study round that photo biomodulation improved the motor function of rats with spinal cord injury.However,the precise mechanism remains unclear.To investigate the effect of photo biomodulation on mitochondrial fission imbalance after spinal cord injury,in this study,we treated rat models of spinal co rd injury with 60-minute photo biomodulation(810 nm,150 mW) every day for 14 consecutive days.Transmission electron microscopy results confirmed the swollen and fragmented alte rations of mitochondrial morphology in neurons in acute(1 day) and subacute(7 and 14 days) phases.Photo biomodulation alleviated mitochondrial fission imbalance in spinal cord tissue in the subacute phase,reduced neuronal cell death,and improved rat posterior limb motor function in a time-dependent manner.These findings suggest that photobiomodulation targets neuronal mitochondria,alleviates mitochondrial fission imbalance-induced neuronal apoptosis,and thereby promotes the motor function recovery of rats with spinal cord injury.

Potential targets and mechanisms of photobiomodulation for spinal cord injury

As a classic noninvasive physiotherapy,photobiomodulation,also known as low-level laser therapy,is widely used for the treatment of many diseases and has anti-inflammatory and tissue repair effects.Photobiomodulation has been shown to promote spinal cord injury repair.In our previous study,we found that 810 nm low-level laser therapy reduced the M1 polarization of macrophages and promoted motor function recovery.However,the mechanism underlying this inhibitory effect is not clear.In recent years,transcriptome sequencing analysis has played a critical role in elucidating the progression of diseases.Therefore,in this study,we performed M1 polarization on induced mouse bone marrow macrophages and applied low-level laser therapy.Our sequencing results showed the differential gene expression profile of photobiomodulation regulating macrophage polarization.We analyzed these genes using gene ontology and Kyoto Encyclopedia of Genes and Genomes enrichment analyses.Networks of protein-protein interactions and competing RNA endogenous networks were constructed.We found that photobiomodulation inhibited STAT3 expression through increasing the expression of miR-330-5p,and that miR-330-5p binding to STAT3 inhibited STAT3 expression.Inducible nitric oxide synthase showed trends in changes similar to the changes in STAT3 expression.Finally,we treated a mouse model of spinal cord injury using photobiomodulation and confirmed that photobiomodulation reduced inducible nitric oxide synthase and STAT3 expression and promoted motor function recovery in spinal cord injury mice.These findings suggest that STAT3 may be a potential target of photobiomodulation,and the miR-330-5p/STAT3 pathway is a possible mechanism by which photobiomodulation has its biological effects.

半导体激光辅助治疗牙周牙髓联合病变的临床研究

目的评价应用半导体激光辅助治疗牙周牙髓联合病变的临床效果。方法选择牙周牙髓联合病变患者30例为研究对象,随机分为试验组和对照组,每组15例。对照组患牙进行根管治疗和牙周系统治疗,试验组患牙在进行根管治疗和牙周系统治疗基础上辅助半导体激光治疗。观测治疗前、治疗3个月后和治疗6个月后牙周探诊深度(PPD)、临床附着水平(CAL)、改良出血指数(mBI)、根尖周指数(PAI)等牙周牙髓临床指标的变化,评价半导体激光在辅助治疗牙周牙髓联合病变中的作用。结果治疗3个月后,试验组和对照组的PPD、CAL和mBI较治疗前均显著下降;试验组PPD下降值与对照组比较差异有统计学意义(P<0.05),试验组CAL和mBI的下降值与对照组比较差异无统计学意义。治疗6个月后,试验组PPD、CAL和mBI持续下降,对照组PPD、CAL和mBI与治疗3个月后无显著变化,试验组与对照组相比差异有统计学意义(P<0.05);2组PAI较治疗前均下降,但是与对照组相比差异无统计学意义。结论半导体激光辅助治疗牙周牙髓联合病变对于取得长期和稳定的疗效有一定作用,对病变中牙周组织损害的辅助治疗效果更为显著。

甲苯胺蓝为光敏剂的光动力疗法对龈上菌斑灭菌效果的研究

目的:比较不同浓度甲苯胺蓝对龈上菌斑的灭菌效果。方法:从门诊20例牙周病病人下前牙区取龈上菌斑一份,放入10mL生理盐水中振荡均匀,在2h内送到微生物室,用微量移液器取25μL放在琼脂培养皿中,在37℃恒温箱中培养24h后,分别滴入0.01,0.1,0.5,1.0,2.5,5.0mg/mL甲苯胺蓝,用12J/cm2,159mW/cm2波长为630nm的二极管激光照射57s后,观察比较各种浓度的灭菌效果。结果:在相同的光波长、光剂量、光强度和光照时间下,1.0mg/mL的甲苯胺蓝的灭菌效果最好,灭菌率为79%。结论:以甲苯胺蓝为光敏剂的光动力疗法对龈上菌斑有灭菌作用。

半导体激光治疗慢性牙周炎临床疗效的Meta分析

目的通过Meta分析,系统评价半导体激光治疗慢性牙周炎的临床疗效。方法计算机检索Medline、Cochrane Library、OVID、PubMed、Web of Science、中国生物医学文献数据库、维普、万方和中国知网数据库,收集关于半导体激光应用于慢性牙周炎治疗的临床随机对照研究,检索时限均为建库至2019年4月。由2位研究员独立筛选文献、提取资料后,对纳入的文献进行质量评价,再采用RevMan 5.3软件对获取的数据进行Meta分析,当各研究之间无统计学异质性或异质性较小时,采用固定效应模型进行分析;反之,采用随机效应模型进行分析。结果最终纳入10篇文献(中文4篇,英文6篇),共245名慢性牙周炎患者。Meta分析结果显示:相较于单纯牙周基础治疗,半导体激光辅助牙周基础治疗能显著减少患者治疗后1个月、3个月的牙周探诊深度(PPD)[1个月:MD=-0.47,95%CI:(-0.79,-0.15),P=0.004;3个月:MD=-0.34,95%CI:(-0.62,-0.07),P=0.01],能有效减少患者1个月、3个月后的出血指数(BI)[1个月:MD=-0.20,95%CI:(-0.34,-0.06),P=0.006;3个月:MD=-0.18,95%CI:(-0.33,-0.03),P=0.02],也能改善患者1个月后的临床附着丧失(CAL)[MD=-0.17,95%CI:(-0.30,-0.04),P=0.01],但3个月后的CAL无明显改善。结论现有证据表明,对于慢性牙周炎,在短期的临床观察随访中,半导体激光辅助牙周基础治疗能获得更好的临床疗效。

一种新型半导体激光治疗机研制

采用二合一光纤系统、高效率光纤耦合装置、Al Ga Inp半导体激光器、方便适用的光纤定位装置以及稳定可靠的电源控制系统 ,研制了一种新型 6 5 0 nm半导体激光治疗仪 ,其光纤端输出达 10 9m W。该仪器已在生物医学领域成功应用。

半导体激光贴肤照射手背皮下静脉血液疗法研究

提出一种将半导体激光器 (LD)贴近皮肤照射皮下静脉进行激光血液辐照治疗的新方法。该方法以手背皮下静脉作为激光照射点 ,采用 6 5 0nm波长激光。给出了新方法所依据的实验基础 ,论述了新方法的可行性 ,说明了与新方法相适应的激光照射装置的设计方案及其照射方式 。

第二代激光光动力肿瘤治疗系统研制

目的： 为满足临床光动力治疗的需要，寻求比630 nm更长波长的激光光源。方法：选用670 nm半导体激光器，采用基于两级结构的微机控制系统，上位管理机既可完成参数打印、数据存档等功能，又可向下位控制机传送控制命令，下位控制机既可独立使用完成实时控制，又可向上位管理机传送数据。结果：实现并生成了与第二代光敏剂相适应的第二代激光光动力治疗系统。