Hard Tissue Laser Research Articles

The effect of laser therapy for the treatment of dentin hypersensitivity on surface roughness and bacterial adhesion

The aim of the study was to measure the degree of dentine surface roughness caused by five distinct lasers used to treat dentine hypersensitivity, as well as to evaluate the subsequent bacterial colonization on these irradiated surfaces. Sixty human maxillary premolar teeth without caries or restoration which were extracted for periodontal reasons were used in this study. Five different types of lasers were applied to the root dentin surface. Tested samples were divided into six groups of 10 samples each; control, diode (810 nm), diode (980 nm), Nd: YAG, Er: YAG, and Er, Cr: YSGG laser groups. The arithmetic mean of the surface roughness values (Ra) and the average roughness over a measurement area (Sa) were measured pre- and post-application using any of the laser types. Swab samples were then collected from the dentin surface. Following a 24-hour incubation period at 37 °C, the colony forming units were counted using a stereoscope. The results demonstrated a statistically significant difference in the surface roughness values pre- and post-application (Ra and Sa, respectively) in the Er, Cr: YSGG laser group (p = 0.037,p = 0.007). No significant difference was observed in the other groups (p > 0.05). There was no statistically significant difference in the number of bacterial colonies observed between the test and control groups. Diode and Nd: YAG lasers showed either a decrease or no change in surface roughness; however, the hard tissue lasers (Er: YAG, Er, Cr: YSGG) showed an increase. The Er: YAG and Nd: YAG laser groups exhibited decreased bacterial adhesion compared to the other groups.

Novel Flowchart Guiding the Non-Surgical and Surgical Management of Peri-Implant Complications: A Narrative Review.

Peri-implant diseases, such as peri-implant mucositis and peri-implantitis, are induced by dysbiotic microbiota resulting in the inflammatory destruction of peri-implant tissue. Nonetheless, there has yet to be an established protocol for the treatment of these diseases in a predictable manner, although many clinicians and researchers have proposed various treatment modalities for their management. With the increase in the number of reports evaluating the efficacy of various treatment modalities and new materials, the use of multiple decontamination methods to clean infected implant surfaces is recommended; moreover, the use of hard tissue laser and/or air abrasion techniques may prove advantageous in the future. Limited evidence supports additional effects on clinical improvement in antimicrobial administration for treating peri-implantitis. Implantoplasty may be justified for decontaminating the implant surfaces in the supracrestal area. Surgical treatment is employed for advanced peri-implantitis, and appropriate surgical methods, such as resection therapy or combination therapy, should be selected based on bone defect configuration. This review presents recent clinical advances in debridement methods for contaminated implant surfaces and regenerative materials for treating peri-implant bone defects. It also proposes a new flowchart to guide the treatment decisions for peri-implant disease.

Automation in Dentistry with Mechanical Drills and Lasers for Implant Osteotomy: A Narrative-Scoping Review.

The popularity of implants is increasing with the aging population requiring oral-dental rehabilitation. There are several critical steps in the implant workflow, including case selection, implant design, surgical procedure, biological tissue responses, and functional restoration. Among these steps, surgical osteotomy procedures are a crucial determinant of clinical success. This brief review was aimed at outlining the current state of the field in automation-assisted implant surgical osteotomy technologies. A broad search of the literature was performed to identify current literature. The results are outlined in three broad categories: semi-automated static (image-guided) or dynamic (navigation-assisted) systems, and fully-automated robotic systems. As well as the current mechanical rotary approaches, the literature supporting the use of lasers in further refinement of these approaches is reviewed. The advantages and limitations of adopting autonomous technologies in practical clinical dental practices are discussed. In summary, advances in clinical technologies enable improved precision and efficacious clinical outcomes with implant dentistry. Hard-tissue lasers offer further advancements in precision, improved biological responses, and favorable clinical outcomes that require further investigation.

Comparative Study of Transmission of 2940 nm Wavelength in Six Different Aesthetic Orthodontic Brackets.

Previous studies have confirmed the superiority of using erbium lasers (2940, 2780 nm) over other lasers in the debonding of ceramic brackets due to their safety and effectiveness. The most important factor in the debonding of aesthetic brackets is the transmission of the erbium laser through the aesthetic bracket to the adhesive resin. To identify the transmission of the 2940 nm wavelength through different types of aesthetic brackets. A total of 60 aesthetic brackets were divided into six equal groups (10 monocrystalline sapphire brackets-Radiance, AO; 10 monocrystalline sapphire brackets-Absolute, Star Dentech; 10 polycrystalline brackets-20/40, AO; 10 polycrystalline brackets-3M Unitek Gemini Clear Ceramic; 10 silicon brackets-Silkon Plus, AO; 10 composite brackets-Orthoflex, OrthoTech). The aesthetic brackets were mounted in a Fourier transform infrared spectrophotometer (FTIR IRPrestige-21, SHIMADZU) following the typical spectroscopy lab procedure for such samples. The transmission ratio for the 2940 nm wavelength was obtained using IRsolution software. The mean transmission values of the tested groups were compared using a one-way analysis of variance (ANOVA) test followed by a Bonferroni test (post-hoc test). The highest transmission ratio was observed for the Radiance sapphire brackets (64.75%) and the lowest was observed for the 3M polycrystalline brackets (40.48%). The differences among the Aesthetic brackets were significant (p < 0.05). The thick polycrystalline and composite brackets have the lowest transmissibility, whereas the monocrystalline sapphire brackets have the highest transmissibility for the 2940 nm wavelength, meaning that there is a higher possibility of debonding them with a hard tissue laser through thermal ablation.

Comparison of micromorphological changes in enamel using SEM analysis after conventional and erbium, chromium:yttrium, scandium, gallium, and garnet hard-tissue laser fissurotomy: An in vitro study.

Well articulated by John Knowles - "Everything has to evolve or else it perishes." With the paradigm shift of emphasis toward the prevention of dental caries, it has been proven that laser irradiation protects against both caries initiation and caries progression. The aim of the study was to evaluate and compare the micromorphology of caries-free extracted premolars using a Scanning electron microscope (SEM) after fissurotomy by conventional fissurotomy bur and erbium, chromium: yttrium, scandium, gallium, and garnet (ER, CR: YSGG) hard-tissue laser. Sixty caries-free premolars extracted atraumatically for orthodontic treatment were included in the study. The samples were divided into two groups randomly (Group 1: fissurotomy by bur, n = 30, and Group 2: fissurotomy by hard-tissue laser, n = 30). Each sample was further divided into halves from the occlusal surface wherein one-half of the occlusal surface received fissurotomy procedure and the other half was control. Samples were analyzed by scanning electron microscopy (SEM) for micromorphological changes. Profile image of control samples revealed the disorganization of enamel surface at the junction of fissures forming a heterogeneous tissue and agglomeration of enamel with deep pit and fissure. On the contrary, the image of experimented samples (with laser fissurotomy) showed smooth enamel surface and homogeneous enamel subsurface with wider pit and fissure owing to self-cleansing ability. On the grounds of the present study results, it could be concluded that the intervention of ER, CR: YSGG hard-tissue laser possesses self-cleansable pit and fissures for caries prevention and has the potential to irradicate the smear layer entirely for superior attachment of remineralizing agents.

Comparison of clinical efficacy of diode laser and erbium, chromium: Yttrium, scandium, gallium, and garnet for implant stage 2 recovery procedure – A randomized control clinical study

Aim:The aim is to compare the clinical efficacy of diode laser and erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er, Cr:YSGG) laser for implant stage 2 recovery procedure.Materials and Methods:A total of 30 patients who had undergone dental implant placement were included in this study. The subjects were randomly allocated into three groups. Group 1 patients (n = 10) had implant recovery using diode laser, Group 2 (n = 10) implant recovery with Er, Cr:YSGG and conventional scalpel method (n = 10) was the third group. The pain assessment was recorded using visual analog scale (VAS scale), time taken for the procedure, intra-operative bleeding, time taken for healing were recorded for the three groups.Results:Data were tabulated and the results were analyzed using SPSS software version 26. Mann–Whitney U-test was used to compare the postoperative analgesic used, postoperative VAS score, the time taken for recovery and time taken for healing between the three study groups. Results were considered to be statistically significant when P < 0.05. Operation duration under Er, Cr:YSGG were much faster than the diode laser, however the results were not statistically significant (P = 0.051). The operation time under Er, Ch: YSGG and laser were faster than the conventional scalpel group (P = 0.000). The time taken for healing was faster in the Er, Cr:YSGG laser group than the diode laser and the scalpel group (P = 0.000). VAS scale at day 0 was higher in the conventional group than the two laser groups (P = 0.000).Conclusion:Considering the advantages of both these laser systems such as less anesthesia, less surgical trauma and faster healing, and post-operative comfort, lasers are an effective tool for implant stage two recovery techniques. However, since diode lasers are more cost effective when compared to Er, Cr:YSGG, diode lasers may meet the clinical needs when compared to hard-tissue lasers.

Lasers in Orthodontics – A Review

Introduction: In past few years, there is huge improvement in orthodontics. Different innovation in orthodontics made the procedure easier and less time consuming. Application of laser is one of them. Many types of dental lasers are currently available that can be efficiently used for soft and hard tissue applications in the field of orthodontics. Two types of lasers are there. One is hard tissue laser, and another is soft tissue laser. Laser therapy is advantageous because it often avoids bleeding, can be pain free, is non‑invasive and is relatively quick. The high cost is its primary disadvantage. The purpose of this article is to provide an overview regarding safe and proper use of soft-tissue lasers in orthodontics

ADOBE READER (Require Adobe Acrobat Reader to open, If you don't have Adobe Acrobat Reader) Index Page 1 Click here to Download IJPR 9[3] JULY - SEPTEMBER 2017 SPECIAL ISSUE July - September 9[3] 2017 Click to download  Manuscript Status... GO Article Detail Comparative Assessment of Intraoperative Pain During Crown Lengthening Procedures Using Soft Tissue and Hard Tissue Laser

ADOBE READER (Require Adobe Acrobat Reader to open, If you don't have Adobe Acrobat Reader) Index Page 1 Click here to Download IJPR 9[3] JULY - SEPTEMBER 2017 SPECIAL ISSUE July - September 9[3] 2017 Click to download  Manuscript Status... GO Article Detail Comparative Assessment of Intraoperative Pain During Crown Lengthening Procedures Using Soft Tissue and Hard Tissue Laser

Dental LASER : A Boon in Dentistry &amp; its significance in Covid-19

LASER stands for light amplification by stimulated emission of radiation. Einstein was the ist to give the foundation for laser , however the first to give laser term was Gordon Gould. Invention of LASER has brought about a major revolution in the ways of life of people. The increasing use of laser in medicine has only been possible due to a better understanding of the interaction between laser light and living tissue. Reliably laser removes the needle, drill, and pain from the dental procedures &amp; also reduces risk of contamination with respect to drills. Laser significantly reduces aerosols and Does not produce scratch material , thus causing less spread of debris outside the oral cavity. Blood free procedures for better recovery . Laser dentistry can be a precise and effective way to perform many dental procedures. Dental laser can be used to generate both hard and soft tissue laser energy, depending upon the patient’s needs.

A Comparative Study to Evaluate the Surface Quality of Erbium Dental Lasers with Conventional Bur Preparation Followed by the Microleakage Assessment of the Composite and Cerec Cad-Cam Restored Cavities

The surface quality of the prepared tooth strongly contributes to the longevity of the filling material and protection against caries. Restoration failure and development of incipient caries under the restoration are one of the major problems we face in our old dental practice despite our utmost struggle. This problem was never addressed until the introduction of modern technology that revealed the mystery behind the failure. With the new modern laser technology, we can overcome the problem at ease. Dental hard tissue laser prepares the cavities through the process called “Water Mediated Ablation”. It has the advantages over the conventional bur preparation by removing any debris such as smear layer and bacterial colonies within the dentinal tubules. This paper therefore, is a comparative study that examines the surface quality of the teeth cavities prepared with two high-end dental lasers Er: YAG, Er, Cr: YSGG with the conventional handpiece bur. Same settings were used for both hard tissue Er: YAG and Er, Cr: YSGG lasers. The surface quality of prepared cavities was examined under an electron microscope. Restoration is made using the state of the art CEREC Cad-Cam system and conventional nano-composite filling material. Cavities were scored for microleakage after thermocycling and dye penetration test. This penetration test contributes to nearly 10 years of stress in the normal oral environment. The microleakage was then examined under a leica microscope. The surface quality of the cavities prepared with both dental hard tissue lasers was clear of smear layer promising the longevity and durability of the restoration and declining of incipient caries. Convention preparation showed smear layer and obstruction of dentinal tubules preventing the bonding material to penetrate and seal leading to the future development of incipient caries and dislodgements.

Use of piezoelectric surgery and Er:YAG laser:which one is more effective during impacted third molar surgery?

BackgroundReduction in postoperative complications is of vital considerations in impacted third molar teeth surgery. The aim of this study was to compare postoperative complications of impacted third molar surgeries for bone removal using laser, piezoelectric equipment, and conventional rotary instruments.MethodsTo address the research purpose, the investigator designed the prospective double-blind clinical trial study. The sample size was determined 20 (40 teeth) by sampling formula in any kind of operation. The data of patients were obtained in the different periods in terms of pain, trismus, swelling, ecchymosis, and patient’s satisfaction and then analyzed using SPSS 20 software via paired t test and Wilcoxon and McNemar’s tests.ResultsThe pain immediately after surgery and 2 days and 7 days after surgery was higher in the laser group. The swelling immediately after surgery was more in the laser group but not significant. The amount of mouth opening immediately after surgery and 2 days and 7 days after surgery was significantly lower in the laser group than in the piezosurgery group. The total duration of surgery and duration of osteotomy were significantly longer in the laser group. The patient’s satisfaction from surgery with piezosurgery was more than that with laser, but this difference was not significant.ConclusionDue to the rising demand for impacted wisdom tooth surgery, the present study suggests that hard tissue laser surgery and piezosurgery can clear the future of impacted molar surgery, and these approaches are more efficient in reducing postoperative complications compared to the conventional surgeries.

Use of carbon dioxide lasers in dentistry

This paper aims to perform a descriptive analysis by reviewing publications concerned with the production of carbon dioxide (CO2) lasers and their technological advancement, optical properties, and parameters in relation to clinical applications in dentistry. This review was based on the literature search in Scopus, Google Scholar, and PubMed in English. The last search was made in December 2017 and there was no publication-year limit. : The 10,600-nm CO2 laser is a readily available dental laser on the market. It enables performance of a bloodless surgical procedure and reduces post-operative discomfort in soft tissue dental surgery. Due to the advancement of technology, CO2 lasers with short pulse duration and high peak power are available. This new-parameter CO2 laser causes less collateral thermal damage to soft tissue than conventional lasers with continuous wave mode. Recently, a 9,300-nm wavelength CO2 laser has been introduced for clinical use in dental hard tissue removal. These developments make CO2 lasers fitting for dental hard tissue preparation. The 10,600-nm CO2 laser is widely accepted for soft tissue surgery applications. Although CO2 lasers have been studied extensively in caries prevention, they have not been applied in clinical practice. The optical properties of 9,300-nm and 9,600-nm CO2 wavelengths are suitable for dental hard tissue treatment. Technological advancements in software and laser parameters will aid in new clinical application and technique development. CO2 lasers as hard tissue lasers will become more popular and more widely accessible to researchers and clinicians.

Laser Technology in Prosthodontics: A Review

Laser is an acronym, which stands for light amplification by stimulated emission of radiation. Several decades ago, the laser was a death ray, the ultimate weapon of destruction, something you would only find in a science fiction story. Then lasers were developed and actually used, among other places, in light shows. The beam sparkled, it showed pure, vibrant and intense colors. Today the laser is used in the scanners at the grocery store, in compact disc players, and as a pointer for lecturer and above all in medical and dental field. The image of the laser has changed significantly over the past several years. With dentistry in the high tech era, we are fortunate to have many technological innovations to enhance treatment, including intraoral video cameras, CAD-CAM units, RVGs and air-abrasive units. However, no instrument is more representative of the term high-tech than, the laser. Dental procedures performed today with the laser are so effective that they should set a new standard of care. The scientific method and artistic details prescribed for reconstructive dentistry are well has been documented. The current use of lasers in reconstructive dentistry encompasses a wide variety of soft tissue procedures. The future may hold promise for hard tissue laser use in crown preparation, bone recontouring, and implant placement.

Optimizing controlled laser cutting of hard tissue (bone)

Abstract Conventional bone surgery leads to unwanted damage to the surrounding tissues and a slow healing process for the patients. Additionally, physicians are not able to perform free cutting shapes due to the limitations of available systems. These issues can be overcome by robot-assisted contactless laser surgery since it provides less mechanical stress, allows precise functional cuts, and leads to faster healing. The remaining drawback of laser surgery is the low ablation rate that is not yet competitive with conventional mechanical piezo-osteotomes. Therefore, we aim at maximizing the efficiency in hard tissue laser ablation by optimizing the lateral movement speed for different irrigation conditions. The results of this study show a non-linear relationship between cutting rates, speeds, and depths that should be critically considered for integration in robotic laser surgery.

Ultrafast dynamics of hard tissue ablation using femtosecond-lasers.

Several studies on hard tissue laser ablation demonstrated that ultrafast lasers enable precise material removal without thermal side effects. Although the principle ablation mechanisms have been thoroughly investigated, there are still open questions regarding the influence of material properties on transient dynamics. In this investigation, we applied pump-probe microscopy to record ablation dynamics of biomaterials with different tensile strengths (dentin, chicken bone, gallstone and kidney stones) at delay times between 1 picosecond and 10 microseconds. Transient reflectivity changes, pressure and shock wave velocities and elastic constants were determined. The result revealed that absorption and excitation show the typical well-known transient behavior of dielectric materials. We observed for all samples a photomechanical laser ablation process, where ultrafast expansion of the excited volume generates pressure waves leading to fragmentation around the excited region. In addition, we identified tensile-strength-related differences in the size of ablated craters and ejected particles. The elastic constants derived were in agreement with literature values. In conclusion, pressure-wave-assisted material removal seems to be a general mechanism for hard tissue ablation with ultrafast lasers. This photomechanical process increases ablation efficiency and removes heated material, thus ultrafast laser ablation is of interest for clinical application where heating of the tissue must be avoided.

Hard Tissue Laser Applications in Pediatric Dentistry

Hard Tissue Laser Applications in Pediatric Dentistry

Comparative Evaluation of the Etching Pattern of Er,Cr:YSGG & Acid Etching on Extracted Human Teeth-An ESEM Analysis.

Etching of enamel and dentin surfaces increases the surface area of the substrate for better bonding of the tooth colored restorative materials. Acid etching is the most commonly used method. Recently, hard tissue lasers have been used for this purpose. The aim of the present study was to evaluate and compare the etching pattern of Er,Cr:YSGG and conventional etching on extracted human enamel and dentin specimens. Total 40 extracted non-diseased teeth were selected, 20 anterior and 20 posterior teeth each for enamel and dentin specimens respectively. The sectioned samples were polished by 400 grit Silicon Carbide (SiC) paper to a thickness of 1.0 ± 0.5 mm. The enamel and dentin specimens were grouped as: GrE1 & GrD1 as control specimens, GrE2 & GrD2 were acid etched and GrE3 & GrD3 were lased. Acid etching was done using Conditioner 36 (37 % phosphoric acid) according to manufacturer instructions. Laser etching was done using Er,Cr:YSGG (Erbium, Chromium : Ytrium Scandium Gallium Garnet) at power settings of 3W, air 70% and water 20%. After surface treatment with assigned agents the specimens were analyzed under ESEM (Environmental Scanning Electron Microscope) at X1000 and X5000 magnification. Chi Square and Student "t" statistical analysis was used to compare smear layer removal and etching patterns between GrE2-GrE3. GrD2 and GrD3 were compared for smear layer removal and diameter of dentinal tubule opening using the same statistical analysis. Chi-square test for removal of smear layer in any of the treated surfaces i.e., GrE2-E3 and GrD2-D3 did not differ significantly (p>0.05). While GrE2 showed predominantly type I etching pattern (Chi-square=2.78, 0.05<p>0.10) and GrE3 showed type III etching (Chi-square=4.50, p<0.05). The tubule diameters were measured using GSA (Gesellschaft fur Softwareentwicklung und Analytik, Germany) image analyzer and the 't' value of student 't' test was 18.10 which was a highly significant result (p<.001). GrD2 had a mean dentinal tubule diameter of 2.78μm and GrD3 of 1.09μm. The present study revealed type I etching pattern after acid etching, while type III etching pattern in enamel after laser etching. The lased dentin showed preferential removal of intertubular dentin while acid etching had more effect on the peritubular dentin. No significant differences was observed in removal of smear layer between the acid etched and lased groups. Although diameter of the exposed dentinal tubules was lesser after lased treatment in comparison to acid etching, further long term in vivo studies are needed with different parameters to establish the usage of Er,Cr:YSGG as a sole etching agent.

Effect of endoactivator and Er,Cr:YSGG laser irradiation in removing the smear layer after root canal instrumentation: An in vitro study

Aim: The objective of this study was to assess the effectiveness of smear layer removal with a newer endodontic irrigation device, i.e., endoactivator system and with hard tissue laser, i.e., erbium, chromium:yttrium, scandium, gallium garnet laser (Er,Cr:YSGG). Materials and Methods: Forty-four mandibular premolars, single-rooted, noncarious teeth were selected. All the canals were prepared by using ProTaper Universal rotary files (Dentsply Maillefer, Ballaigues, Switzerland) and 3% NaOCl. Teeth were then divided into two control groups and two experimental groups. Group A: Negative control group (N = 11)- without any final irrigation, Group B: Positive control group (N = 11)- final rinse with 1 mL smear clear for 1 min using no. 30 gauge needle, Group C: Endoactivator group (N = 11)-1 mL smear clear + endoactivator, Group D: Er,Cr:YSGG laser group (N = 11). Teeth were sectioned and observed for smear layer removal at apical, middle, and coronal thirds under scanning electron microscope (SEM). Results: Results were interpreted analytically by Kruskal-Wallis test and Wilcoxon signed-ranks test. Conclusion: The two experimental groups were significantly more efficient in smear layer removal than the control groups. There was no significant difference between the endoactivator and laser groups. All groups showed more efficient smear layer and debris removal coronally than in the middle and apical regions.

Implementation of New Technologies in U.S. Dental School Curricula

With dentistry rapidly evolving as new technologies are developed, this study aimed to identify the penetration of emerging dental technologies into the curricula of U.S. dental schools and to explore whether certain school characteristics affected adoption of these technologies. A 19-question survey was sent to the academic deans of all 62 U.S. dental schools. In addition to questions about characteristics of the school, the survey asked respondents to indicate where in their curricula the technology was incorporated: preclinical didactic, preclinical laboratory, clinical didactic, and/or clinical patient experience. Of 62 eligible schools, 33 useable responses were received, for a 52% response rate. The results showed that the greatest overall penetration of dental technologies was in preclinical didactic courses and the lowest was in the preclinical laboratory. Specific technologies implemented in the largest percentage of responding schools were digital radiography and rotary endodontics. The technologies with the lowest penetration were CAD/CAM denture fabrication and hard tissue lasers. These results suggest that the incorporation of technology into dental schools is following that of private practice as the most widely adopted technologies were those with the greatest acceptance and use in private practice. Among the respondents, factors such as class size and age of the school had greater impact on incorporation of technology than funding source and geographic location.

Effectiveness of Diode Laser and Er, Cr:YSGG Laser in the Treatment of Oral Leukoplakia-A Comparative Study

Background: Soft tissue lasers and certain hard tissue laser have been used in the treatment of oral mucosal lesions. This study was an attempt to compare soft tissue laser and hard tissue laser in treating oral leukoplakia. Aim and Objective: To compare the effectiveness of Diode Laser and Er,Cr: YSGG Laser in treating oral leukoplakia by assessing intraoperative pain and bleeding and postoperative pain on the following seven postoperative days as well as wound healing on the 7th, 14th and 21st post-operative days. The one year assessment of recurrence of the lesion was also analysed. Methodology: The study population included five patients, above the age of 18 years, provisionally diagnosed and histopathologically confirmed as having oral leukoplakia. In each patient part of the lesion was treated with Diode laser and the rest with Er,Cr:YSGG laser. Each patient was assessed individually during both laser procedures for intraoperative pain and bleeding during procedure, for postoperative pain on the following seven post-operative days and for wound healing on the 7th, 14th and 21st day after treatment. Pain was assessed using three different pain rating scales and wound healing using visual method. Recurrence by clinical and histopathological analysis after one year. Results: Using Diode laser caused minimal to no pain, excellent hemostasis and good wound healing with no postoperative complications and Er,Cr:YSGG laser caused minimal discomfort to patient, profuse bleeding during procedure and good healing outcome in treatment of oral leukoplakia. No recurrence was observed after one year. Conclusion: While comparing both the lasers, in this present study it has been concluded that Diode laser (940 nm) is superior to that of Er,Cr:YSGG laser (2780 nm) in treating oral leukoplakia. Er, Cr:YSGG laser can also be considered for treating oral leukoplakia.