Abstract:
BACKGROUND AND OBJECTIVES:Laser has been reported as a heat source for melting and re-crystallization. Occurring at about 1100 degrees C, the melting of surface dental enamel along with re-crystallization might have an assistant role in the therapy of hypersensitive tooth, apical sealing of endodontic surgery in dentistry, preventive dentistry for pit and fissure sealing, and fluoridation. For laser to be accepted in clinical applications, it is desired that, studies must show the incorporation of CaF(2) into hydroxyapatite could reduce the sintering temperature for the sake of safety. STUDY DESIGN/MATERIALS AND METHODS:In this study, the Sharplan 20XJ CO(2) laser with 10.6- microm wavelength was set under the following parameters: power, 5 W; repetitive mode, 0.1 second; beam, focused. Fluorite was added to hydroxyapatite as a synthetic compound to lower the sintering temperature. Human dental enamel without caries was used for in vitro sintering test. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), Fourier transforming infrared spectroscopy (FTIR), and differential thermal analysis/thermogravimetric analysis (DAT/TGA) were used for the investigation of sintering mechanism of CaF(2). RESULTS:Fusion between hexagonal shape crystals and cubic shape crystals (CaF(2)) were observed under SEM study. Hexagonal shape crystals indicated the formation of fluorapatite under XRD analysis. Under FTIR study, we examined reductions of water (3445 cm(-1)) and hydroxyl bands (3567 and 627 cm(-1)) in irradiated compounds. From the DTA pattern of synthetic compound, it showed the endothermic reaction reaching its peak point around 1180 +/- 20 degrees C. It was attributed to the phase transformation and/or initial melting. CONCLUSIONS:In this study, we proposed the interrelationship of the eutectics between initiator (CaF(2)) and the reaction product (calcium hydroxide) that reduced the sintering temperature. It appeared that the co-eutectics interacted to reduce the sintering temperature of hydroxyapatite below 800 degrees C and that the key eutectic was calcium hydroxide. The clinical feasibility of the melting and re-crystallization of hydroxyapatite under 10.6-microm CO(2) laser would be therefore enhanced.
journal_name
Lasers Surg Medjournal_title
Lasers in surgery and medicineauthors
Wu CC,Roan RT,Chen JHdoi
10.1002/lsm.10124subject
Has Abstractpub_date
2002-01-01 00:00:00pages
333-8issue
5eissn
0196-8092issn
1096-9101journal_volume
31pub_type
杂志文章abstract::Methods used to revascularize ischemic myocardium have included arterial reconstruction, coronary artery bypass grafting, providing direct circulation from the intraventricular chamber, and techniques to promote collateral circulation. Ventricular channels from the epicardial surface through the endocardium are readil...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900030307
更新日期:1983-01-01 00:00:00
abstract::Current laser dentistry since our initial studies in 1964 is reviewed. Three areas are considered: routine dental office practice, tooth restoration, and oral surgery. For tooth restoration and oral surgery, CO2 and neodymium:YAG lasers are used and lasers are used in photodynamic therapy for oral cancer. Dental offic...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900060616
更新日期:1987-01-01 00:00:00
abstract::During a ten-year period 642 abdominal hollow organ resections have been performed by means of a new, original technique--that is, CO2 laser irradiation combined with specially designed instrumentation. This resulted in a remarkable decrease in postoperative morbidity and mortality. The article describes the laser pro...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900070402
更新日期:1987-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:Recently developed laser lipolysis systems have been disappointing because they require more time to remove the same amount of fat than other liposuction methods. A new Nd:YAG laser has been introduced that uses the 1,444 nm wavelength, better absorbed by fat. STUDY DESIGN/MATERIALS AND METHO...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.20786
更新日期:2009-12-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Light dosimetry for endobronchial photodynamic therapy is not very advanced to date. This study investigates the dependency of the fluence rate distribution in the bronchial wall on several parameters. STUDY DESIGN/MATERIALS AND METHODS:A Monte Carlo model is employed for the illumination of a...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/(sici)1096-9101(1998)22:4<193::aid-lsm3>3.
更新日期:1998-01-01 00:00:00
abstract::For our study of the effect of low energy laser irradiation (LELI) on living tissue we used HeNe laser on rats. The exponential absorption was reaffirmed in the living tissues overlying the sciatic nerve. An optimal range of energy between 3.5 and 7 J--associated with energy concentration of 4-10 J/cm2 delivered trans...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900060502
更新日期:1986-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Soft tissue sarcomas (STS) are a rare and heterogeneous group of malignant tumors that are often treated through surgical resection. Current intraoperative margin assessment methods are limited and highlight the need for an improved approach with respect to time and specificity. Here we investi...
journal_title:Lasers in surgery and medicine
pub_type: 临床试验,杂志文章
doi:10.1002/lsm.22564
更新日期:2016-10-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:In Holmium laser lithotripsy, usually, the surgeon is guided by a visible beam superimposing the infrared (IR) treatment radiation. It has been shown that a green aiming beam excites stone autofluorescence. This fluorescence signal can be used for calculi detection to check the correct fiber p...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.23154
更新日期:2020-06-01 00:00:00
abstract::CO2, Nd:YAG, and argon lasers have been used for 5 years for experimental and clinical procedures at the National Cancer Institute of Milan under the auspices of the National Research Council. Experimental data regarding tumor cell spread through lymphatic and hematic channels and cell viability in the fumes after CO2...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900020409
更新日期:1983-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:The purpose of this study was to compare the effect of Low-Level Laser Therapy (LLLT) with sham and whirlpool treatment on the contracted knee joint in rat. STUDY DESIGN/MATERIALS AND METHODS:Forty-eight Wistar rats were operated on to immobilize knee joint, and 1 week after operation they wer...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/(sici)1096-9101(1998)22:2<81::aid-lsm3>3.0
更新日期:1998-01-01 00:00:00
abstract::This article reviews the principle uses of ophthalmic lasers, providing historical background with an emphasis on new applications and areas of investigation. Ophthalmic photocoagulation was the first medical laser application and has restored or maintained vision in millions of people. More recently, photodisruption ...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章,评审
doi:10.1002/lsm.1900170203
更新日期:1995-01-01 00:00:00
abstract::A 63 year old male underwent 6,900 rads of external radiation for a squamous cell carcinoma of the left main bronchus. Recurrence of the tumor 8 months later was treated with 6,618 joules and patency of the left main bronchus was restored. Four months later, he developed complete atelectasis of the left lung requiring...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900120316
更新日期:1992-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:Complete neurosurgical resection of intracranial meningiomas is essential to avoid residual tumor tissue and thus minimize the risk of tumor recurrence. However, local recurrence of meningiomas is not uncommon mainly due to insufficient intraoperative detection of residual tumor tissue within ...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.23294
更新日期:2020-07-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:To produce controlled, spatially confined thermal effects in dermis. STUDY DESIGNS/MATERIALS AND METHODS:A 1 W, 1,500 nm fiber-coupled diode laser was focused with a high numerical aperture (NA) objective to achieve a tight optical focus within the upper dermis of skin held in contact with a ...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.20142
更新日期:2005-04-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:Currently there is no safe, effective, and rapid means to eliminate the pain associated with a needle insertion through the skin. It is hypothesized that ablation of the stratum corneum layer using a low energy Erbium(Er):YAG laser would allow rapid local anesthesia from a lidocaine product. ...
journal_title:Lasers in surgery and medicine
pub_type: 临床试验,杂志文章
doi:10.1002/lsm.10101
更新日期:2002-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:The aim was to investigate the bactericidal effect of the 1,064 nm Nd:YAG laser on Staphylococcus epidermidis. MATERIAL AND METHODS:S. epidermidis was inoculated on agar plates and then exposed to pulsed laser light in three different modes: with an uninterrupted train of pulses, or with two d...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/1096-9101(2000)27:4<336::aid-lsm6>3.0.co;2
更新日期:2000-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:To evaluate the effects on disruption of hair growth of the non-coherent filtered flashlamp intense pulsed light (IPL) source. MATERIALS AND METHODS:Twenty-eight sites on 23 patients with Fitzpatrick type I-III were enrolled using a single treatment IPL followed for three months post-treatment...
journal_title:Lasers in surgery and medicine
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1002/(sici)1096-9101(1999)24:2<128::aid-lsm8>3.
更新日期:1999-01-01 00:00:00
abstract::This investigation was designed to compare standard scalpel transections of the tibial branch of the rat sciatic nerve with those performed using either a milliwatt carbon dioxide (CO2) or a potassium titanyl phosphate (KTP/532) laser. Four transection groups consisted of nerves sectioned with (1) scalpel (control), (...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900120109
更新日期:1992-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Striae distensae (SD) are cutaneous lesions that often occur on the breasts, abdomen, hips, and thighs. The aim of this study is to evaluate the effectiveness of a new technique using a non-invasive Er:YAG laser combined with Spatially Modulated Ablation (SMA) module for the treatment of SD. S...
journal_title:Lasers in surgery and medicine
pub_type: 临床试验,杂志文章
doi:10.1002/lsm.23042
更新日期:2019-03-01 00:00:00
abstract::Assessments of non-surgical office-based aesthetic treatments' efficacy including lasers are mostly based on subjective evaluation of clinical photography. Accumulating evidence suggest that non-invasive skin imaging such as optical coherence tomography (OCT) can be effectively used to assess not only the skin surface...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章,评审
doi:10.1002/lsm.23219
更新日期:2020-10-01 00:00:00
abstract:BACKGROUND:Low-level laser therapy (LLLT) is a noninvasive treatment for a wide-assortment of medical ailments. A recent application is for noninvasive body slimming. A Level 1 clinical study was completed and recorded a significant reduction in circumferential measurements across waist, hips, and thighs compared to pl...
journal_title:Lasers in surgery and medicine
pub_type: 临床试验,杂志文章
doi:10.1002/lsm.22007
更新日期:2012-03-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:High-power laser has recently become a physical stimulus for bone regeneration. Little is known about how high-power laser irradiation affects osteoblast differentiation. This study investigated osteoblast responses to high-power laser and combined irradiation with BMP-2 treatment. STUDY DESIG...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.20870
更新日期:2010-08-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:Previously, we have shown that a 43°C pretreatment can provide thermotolerance to a following, more severe, thermal stress at 45°C. Using cells that lack the Hsp70 gene, we have also shown that there is still some thermotolerance in the absence of HSP70 protein. The purpose of this study was t...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.20983
更新日期:2010-12-01 00:00:00
abstract::We describe our experience and the problems we encountered organizing an autonomous surgical unit in which the equipment and organization enable three lasers to be used in may different applications in medicine and surgery. The three lasers--CO2, Nd:YAG, and argon--may now be used by all the departments concerned with...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900030102
更新日期:1983-01-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Fifty percent human albumin solder significantly improves weld strength when compared to lower concentrations [Wright et al., ASLMS meeting, April, 1995]. We developed a method for preparing 50% human albumin that may be considered compatible for clinical applications. STUDY DESIGN/MATERIALS A...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/(SICI)1096-9101(1996)19:1<2::AID-LSM1>3.0.
更新日期:1996-01-01 00:00:00
abstract::Intestinal welding by means of low-power laser has been reported as an efficient method for intestinal anastomosis. We designed an experimental model in rats to investigate collagen and DNA concentrations in CO2 laser-welded anastomoses as compared with those in sutured anastomoses on the 4th, 7th, and 10th postoperat...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900140106
更新日期:1994-01-01 00:00:00
abstract::The effects of picosecond laser-induced optical breakdown on tissue were investigated using high-intensity 40 ps Nd:YAG laser pulses at 1.06 microns. Tissue damage was evaluated using the corneal endothelium in vitro as a model system. Systematic studies were performed to determine the scaling of the tissue damage and...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章,评审
doi:10.1002/lsm.1900090302
更新日期:1989-01-01 00:00:00
abstract:OBJECTIVE:Owing to skin aging and the growing demand for skin rejuvenation, minimal invasive aesthetic treatments such as laser procedures are increasingly coming into focus. However, until now, little has been known about the objective effects of these procedures with respect to skin microcirculation or changes in ski...
journal_title:Lasers in surgery and medicine
pub_type: 临床试验,杂志文章
doi:10.1002/lsm.22710
更新日期:2017-12-01 00:00:00
abstract:BACKGROUND AND OBJECTIVES:The effects of Er:YAG laser irradiation on dentin have not been sufficiently investigated. The purpose of this study was to investigate the effects of Er:YAG laser irradiation on dentin. STUDY DESIGN/MATERIALS AND METHODS:After cavities were prepared using Er:YAG laser irradiation or rotary c...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.10061
更新日期:2002-01-01 00:00:00
abstract::The advantages of the laser have been extolled in the literature but, in contrast, there is a paucity of information on the hazards involved in its surgical use. Recognition and prevention of risks is a mandatory requirement. The experience by encounter is described with counsel as to the prerequisite of taking precau...
journal_title:Lasers in surgery and medicine
pub_type: 杂志文章
doi:10.1002/lsm.1900040207
更新日期:1984-01-01 00:00:00