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1.
Urologiia ; (2): 21-26, 2021 May.
Artigo em Russo | MEDLINE | ID: mdl-33960152

RESUMO

INTRODUCTION: The length of the operation to remove urinary concernments has a marked effect on the occurrence of postoperative complications in the time of the postoperative patients in the hospital. A significant factor contributing to the increase in time is the clouding of the fragmentation region, which increases the operation time and the number of complications. PURPOSE: to develop a method of reducing the time of additional costs in contact lithotripsy with a holmium laser in order to reduce the risk of postoperative complications. MATERIALS AND METHODS: The paper presents the own results of in vivo measurements of time intervals spent on fragmentation of stone. Fragmentation of stones in kidney was carried out by a holmium lithotripter of Triple type with the help of semirigid and flexible ureteroscopes. In the case of severe clouding of the fragmentation region, the author s technique of percutaneous micro-drainage of the kidney was used. The evaluation of the duration of the fragmentation procedure is based on statistical processing of the obtained measurement data using Excell Data Analysis tools. RESULTS: In the process of analysis of literary sources and results of own studies it was revealed that with increase in duration of contact laser lithotripsy the number of postoperative complications significantly increases. In order to reduce the time of transurethral contact holmium lithotripsy, the author s technique of percutaneous micro-drainage has been developed. By in vivo measurements and statistical processing of the data, it was found that by using the micro-drainage technique, the average additional washing time of the fragmentation region was reduced by an average of 4 times compared to the conventional technique. CONCLUSION: By further washing the fragmentation region, it is possible to reduce the time of additional crushing costs by at least 4 times and reduce the number of postoperative complications.


Assuntos
Lasers de Estado Sólido , Litotripsia a Laser , Litotripsia , Drenagem , Humanos , Resultado do Tratamento , Ureteroscópios , Ureteroscopia
2.
Hinyokika Kiyo ; 67(3): 97-102, 2021 Mar.
Artigo em Japonês | MEDLINE | ID: mdl-33957029

RESUMO

To identify which patients will have difficulty during morcellation in holmium laser enucleation of the prostate (HoLEP), we analyzedthe association of preoperative factors with morcellation efficiency retrospectively. Between March 2015 andMay 2019, 129 patients with benign prostatic hyperplasia (BPH) underwent HoLEP at our institution. Based on the morcellation efficiency (morcellation volume per minute), they were classifiedinto easy (≥3 g/min, n=81) andd ifficult (<3 g/min, n=48) groups. In patients who underwent computed tomography (CT) before the surgery, CT values of the prostatic adenomas were measured. The preoperative parameters were comparedbetween the two groups. Comparedwith the easy group, the morcellation time in the difficult group was significantly longer (median, 11 vs 18.5 min, <0.001), though prostate volume was not significantly different (median, 76.3 vs 69.3 ml, p=0.116). The body mass index (BMI) was significantly lower in the difficult group (median, 23.2 vs 21.9 kg/m2, p=0.007), andit was positively correlatedwith morcellation efficiency. The difference between the maximum andaverage CT values tended to be lower in the difficult group (median, 43.6 vs 39.2 HU, p=0.066), andit was positively correlatedwith BMI andmorcellation efficiency. Morcellation appearedto be difficult in BPH patients with low BMI because of the homogeneous hardness of prostatic adenoma.


Assuntos
Lasers de Estado Sólido , Morcelação , Hiperplasia Prostática , Hólmio , Humanos , Lasers de Estado Sólido/uso terapêutico , Masculino , Hiperplasia Prostática/cirurgia , Estudos Retrospectivos , Resultado do Tratamento
4.
Oper Dent ; 46(1): 100-106, 2021 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-33882137

RESUMO

CLINICAL RELEVANCE: Removing laminate veneers on anterior teeth by using an Er,Cr:YSGG dental laser can be completed faster than previously reported while maintaining thermal safety.


Assuntos
Lasers de Estado Sólido , Silicatos de Alumínio , Cerâmica , Lasers de Estado Sólido/uso terapêutico
5.
Arch Esp Urol ; 74(3): 343-349, 2021 Apr.
Artigo em Inglês, Espanhol | MEDLINE | ID: mdl-33818431

RESUMO

OBJECTIVES: With the spread of more powerful lasers and the advent of new technologies, endoscopic interventions for urolithiasis are continuously evolving. The aim of this study is to present our experience and technique regarding Low Energy (LE)/High Frequency (HF) lithotripsy by using a 120-W Holmium laser (Lumenis®). METHODS: We retrospectively analysed our prospectively maintained Retrograde Intra Renal Surgery (RIRS) database. Lithotripsy was performed using LE/HF settings with a Long Pulse Width (LPW) and consisted of the following steps: 1) contact Laser lithotripsy (LE/HF/LPW dusting - 0,5 J/50 Hz or 02 J/70 Hz); 2) extraction ofmain fragments; 3) non-contact Laser lithotripsy (LE/HF/Short Pulse Width Pop Dusting - 0,5 J /80Hz). Pre-operativeand peri-operative outcomes were collected. Post-operative complications were recorded according to Clavien-Dindo Grading System. Finally, all patients under went a CT scan at three months after RIRS to assess the success of procedure, defined as stone-free or presence of ≤4 mm fragments (Clinical Insignificant Residual Fragments - CIRF). RESULTS: Overall, 104 LE/HF/LPW RIRS from December 2017 to January 2019 were performed. Mean operative time was 59 (SD ±23) minutes, median post-operative stay was two days (IQR 2-3). The post-operative complication rate was 4,8%: one patient had nausea and vomiting (Clavien-Dindo I) and four patients developed urosepsis (Clavien-Dindo II). The success rate was 88,5% (71,2% stone-free and 17,3% CIRF). CONCLUSIONS: LE/HF/LPW RIRS seems to be safe and effective in terms of positive success rate, safety and standard operative time. However, randomized clinical trials are needed to compare this technique to standard RIRS.


Assuntos
Cálculos Renais , Lasers de Estado Sólido , Litotripsia a Laser , Humanos , Cálculos Renais/cirurgia , Lasers de Estado Sólido/uso terapêutico , Estudos Retrospectivos , Resultado do Tratamento , Ureteroscopia
6.
Urologiia ; (1): 28-32, 2021 Mar.
Artigo em Russo | MEDLINE | ID: mdl-33818931

RESUMO

INTRODUCTION: surgical treatment of urinary stone disease plays an important role in urological practice. Stone fragmentation can be performed using various lithotripters, from which Holmium fiber laser (Ho: YAG) has currently taken the main place. According to the current literature, a superpulsed thulium fiber laser with a wavelength of 1.94 m and a maximum power output of 40 W showed in vitro higher efficiency compared to Ho: YAG, while having the same safety profile. The use of a thulium fiber laser with a pulse energy of 0.025-6 J and a high repetition rate (up to 1600 Hz) allows to most effectively perform stone dusting during retrograde intrarenal surgery (RIRS). AIM: to improve the performance of RIRS using the 1.94m superpulsed thulium fiber laser. MATERIALS AND METHODS: a total of 152 patients with renal stones who were treated during the period from February 2018 to July 2019 were included in the study. The analysis of the laser settings, their effect on retropulsion and visibility when performing RIRS using a superpulsed thulium fiber laser with a wavelength of 1.94 m and a maximum power output of 40 W, a peak power of 500 W, as well as an assessment of the stone-free rate the first postoperative day and 3 months after the procedure was done. RESULTS: The most frequently used settings were as following: 0.5 J, 30 Hz, 15 W (No. 1), 0.15 J, 200 Hz, 30 W (No. 2), 0.8 J, 31.25 Hz, 25 W (No. 3), 0.8 J, 37.5 Hz, 30 W (No. 4). The statistical analysis of the influence of the settings on the quality of endoscopic imaging and retropulsion was carried out. In addition, the features of each settings were analyzed. The stone-free rate on the first postoperative day was evaluated using low-dose CT. CONCLUSION: A superpulsed thulium fiber laser with a wavelength of 1.94 m and a maximum power of 500 W has shown high efficiency in clinical practice when performing RIRS, since it allows to have good endoscopic imaging, minimal retropulsion, and to perform stone dusting, which had a positive effect on the stone-free rate. Optimization of the settings of thulium fiber lithotripsy may improve the results of surgical treatment of urinary stone disease.


Assuntos
Cálculos Renais , Lasers de Estado Sólido , Litotripsia a Laser , Cálculos Urinários , Humanos , Túlio , Cálculos Urinários/cirurgia
7.
Artigo em Inglês | MEDLINE | ID: mdl-33819321

RESUMO

This paper reports on a study undertaken to ascertain the efficacy of the erbium:YAG laser (EYL) for peri-implantitis treatment. A total of 12 patients with bone loss resulting from peri-implantitis were involved in this study. The treatment protocol consisted of using the EYL for implant surface debridement and deproteinized bovine bone mineral (DBBM) for bone grafting. The following parameters were analyzed: probing pocket depth (PPD), clinical attachment level (CAL), bleeding on probing (BOP), bone levels (BLs), and the lipopolysaccharide levels before and after debridement with the EYL. This study found a statistically significant improvement in PPD, CAL, BOP, and BL at 3 and 12 months postoperative. Furthermore, a statistically significant decrease in implant-surface LPS levels was observed following debridement with the EYL. These findings show that using the EYL for debridement in peri-implantitis cases is effective in decreasing LPS levels. Moreover, after partial reconstruction with DBBM grafting, BLs were restored for at least 12 months. It was shown in one case that BLs had remained stable over 6 years, which also attests to the efficacy of this treatment. The combined use of EYL and DBBM could be effective for regenerative surgical peri-implantitis treatment.


Assuntos
Implantes Dentários , Lasers de Estado Sólido , Peri-Implantite , Animais , Biomarcadores , Bovinos , Érbio , Humanos , Lasers de Estado Sólido/uso terapêutico , Peri-Implantite/cirurgia
8.
J Appl Oral Sci ; 29: e20200266, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33825761

RESUMO

OBJECTIVES: We analyzed the effects of the Er:YAG laser used with different parameters on dentinal tubule (DT) occlusion, intrapulpal temperature and pulp tissue morphology in order to determine the optimal parameters for treating dentin hypersensitivity. METHODOLOGY: Dentin specimens prepared from 36 extracted human third molars were randomized into six groups according to the treatment method (n=6 each): control (A); Gluma desensitizer (B); and Er:YAG laser treatment at 0.5 W , 167 J/cm2 (50 mJ, 10 Hz) (C), 1 W , 334 J/cm2 (50 mJ, 20 Hz) (D), 2 W , 668 J/cm2 (100 mJ, 20 Hz) (E), and 4 W and 1336 J/cm2 (200 mJ, 20 Hz) (F). Treatment-induced morphological changes of the dentin surfaces were assessed using scanning electron microscopy (SEM) to find parameters showing optimal dentin tubule occluding efficacy. To further verify the safety of these parameters (0.5 W, 167 J/cm2), intrapulpal temperature changes were recorded during laser irradiation, and morphological alterations of the dental pulp tissue were observed with an upright microscope. RESULTS: Er:YAG laser irradiation at 0.5 W (167 J/cm2) were found to be superior in DT occlusion, with an exposure rate significantly lower than those in the other groups (P<0.05). Intrapulpal temperature changes induced by Er:YAG laser irradiation at 0.5 W (167 J/cm2) with (G) and without (H) water and air cooling were demonstrated to be below the threshold. Also, no significant morphological alterations of the pulp and odontoblasts were observed after irradiation. CONCLUSION: Therefore, 0.5 W (167 J/cm2) is a suitable parameter for Er:YAG laser to occlude DTs, and it is safe to the pulp tissue.


Assuntos
Lasers de Estado Sólido , Oclusão Dentária , Dentina , Humanos , Lasers de Estado Sólido/uso terapêutico , Microscopia Eletrônica de Varredura
9.
J Appl Oral Sci ; 29: e20200736, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33825753

RESUMO

OBJECTIVE: To evaluate the efficacy of Nd:YAG laser associated with calcium-phosphate desensitizing pastes on dentin permeability and tubule occlusion after erosive/abrasive challenges. METHODOLOGY: Dentin specimens were exposed to 17% ethylene diamine tetra-acetic acid (EDTA) solution for 5 min and randomly allocated into five groups: G1, control (no treatment); G2, Nd:YAG laser (1 W, 10 Hz, 100 mJ, 85 J/cm2); G3, Laser + TeethmateTM Desensitizer; G4, Laser + Desensibilize Nano P; and G5, Laser+Nupro®. Specimens underwent a 5-day erosion-abrasion cycling. Hydraulic conductance was measured post-EDTA, post-treatment, and post-cycling. Post-treatment and post-cycling permeability (%Lp) was calculated based on post-EDTA measurements, considered 100%. Open dentin tubules (ODT) were calculated at the abovementioned experimental moments using scanning electron microscopy and ImageJ software (n=10). Data were analyzed using two-way repeated measures ANOVA and Tukey's test (α=0.05). RESULTS: G1 presented the highest %Lp post-treatment of all groups (p<0.05), without significantly differences among them. At post-cycling, %Lp significantly decreased in G1, showed no significant differences from post-treatment in G3 and G4, and increased in G2 and G5, without significant differences from G1 (p>0.05). We found no significant differences in ODT among groups (p>0.05) post-EDTA. At post-treatment, treated groups did not differ from each other, but presented lower ODT than G1 (p<0.001). As for post-cycling, we verified no differences among groups (p>0.05), although ODT was significantly lower for all groups when compared to post-EDTA values (p<0.001). CONCLUSION: All treatments effectively reduced dentin permeability and promoted tubule occlusion after application. COMBINING ND: YAG laser with calcium-phosphate pastes did not improve the laser effect. After erosive-abrasive challenges, treatments presented no differences when compared to the control.


Assuntos
Dessensibilizantes Dentinários , Lasers de Estado Sólido , Cálcio/farmacologia , Dentina , Permeabilidade da Dentina , Lasers de Estado Sólido/uso terapêutico , Microscopia Eletrônica de Varredura
10.
Eur J Paediatr Dent ; 22(1): 47-54, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33719483

RESUMO

AIM: The aim of this study was to review the craniofacial growth impairment and different malfunctions associated with short lingual frenum and to assess the validity of lingual frenum surgery based on minimally invasive laser release with a myofunctional approach. MATERIALS AND METHODS: Thirty patients, children and adolescents whose ages ranged from 8 years to 18 years, diagnosed with a short lingual frenum and concomitant orthodontic problems and/or presence of associated muscular or postural problems, were treated in this study. Pre-operative tongue assessment was performed following morphological and functional criteria, consisting of measurement of the free tongue, and of visual assessment of tongue protrusion out of the mouth and elevation to the incisive palatal papilla. Postural evaluation was assessed in frontal and lateral view. Laser surgery was completed with local anaesthesia, using Erbium YAG laser (2940 nm, LightWalker, AT-Fotona, Ljubljana, Slovenia) equipped with sapphire conical tip (600 micron), with energy ranging from 120 to 160 mJ, at 15 Hz frequency, and varying the adjustable pulse duration from 300 µs to 600 µs. RESULTS: Significant improvement was noted in 29 of 30 patients comparing preoperative scores to both three-week and two-month post-op scores. Postural improvement was found in 18 of 30 patients, indicating the multifactorial involvement of different causes for correct body posture. CONCLUSION: This study confirmed the validity of Erbium:YAG laser surgery as an effective technique in children and adolescents to release a short lingual frenum. The functional approach of the procedure performed with the Erbium:YAG laser, and the concomitant myofunctional therapy demonstrated to be simple and safe in children, and adolescents. Because of the multifactorial causes involved in correct body posture, an adequate osteopathic therapy is important to successfully complete the full body rehabilitation.


Assuntos
Terapia a Laser , Lasers de Estado Sólido , Doenças da Língua , Adolescente , Criança , Humanos , Lactente , Freio Lingual/cirurgia , Língua , Doenças da Língua/cirurgia
12.
Hautarzt ; 72(5): 421-425, 2021 May.
Artigo em Alemão | MEDLINE | ID: mdl-33740081

RESUMO

Laser technology represents a major advance in the treatment of vascular changes. Excellent knowledge combined with technological advances in new laser sources form the basis of this safe and effective option in many acquired or congenital vascular changes on the face. With regard to the different laser sources, the pulsed dye laser (PDL) has the best efficacy-to-safety ratio. This type of laser remains the gold standard for vascular lesions. Neodymium-doped yttrium aluminium garnet (Nd: YAG) lasers and diode lasers, among others, as well as intensed pulsed light (IPL), play an important role in addressing vascular changes in the face. Good knowledge of the laser approach to vascular lesions and technological progress have led to safety features that seek to minimize side effects. These advances mainly include the introduction of cooled tips, cooling devices and cooling systems, changes in pulse duration, and the introduction of different wavelengths, among others. However, undesirable side effects can still occur. Although these are mostly discrete and resolve spontaneously, some complications can be serious and difficult to manage. Therefore, the prevention and early management of complications are all the more important in the treatment of vascular changes on the face.


Assuntos
Terapia a Laser , Lasers de Corante , Lasers de Estado Sólido , Face , Humanos , Lasers de Estado Sólido/efeitos adversos , Resultado do Tratamento
13.
Am J Dent ; 34(1): 31-38, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33544986

RESUMO

PURPOSE: To examine the marginal adaptation in enamel and dentin of mixed Class V saucer shaped restorations where cavities were prepared by two different lasers. METHODS: A handpiece-integrated Er:YAG laser @ 4.5 W, 300 mJ, 15 Hz (LiteTouch III) and a novel CO2 laser @ 12.95 W, 19.3 mJ, 671 Hz (Solea 9.3 µm). Diamond bur preparation with a 25 µm diamond bur (Intensiv) in a red contra angle at high speed under water spray cooling served as the control. Eight cavities per group were readied and restored under simulation of dentin fluid with a one bottle universal adhesive (One Coat 7 Universal) and a nanohybrid resin composite (Everglow), applied in two layers. For every preparation technique, the adhesive system was applied in the selective-etch and the self-etch mode, resulting in six experimental groups. Marginal analysis was performed immediately after polishing and after simultaneous thermal (5-50°C, 2 minutes each) and mechanical (max. 49 N; 200,000 cycles) loading by using a SEM (x200 magnification). RESULTS: Significant differences were found for all groups - except groups 2 and 5 - between initial and terminal results and between the groups as well (P< 0.05, 2-way ANOVA with Fisher's post-hoc test). The bur prepared group with selective-etch technique showed the best overall results after loading, followed by Er:YAG prepared self-etch group and CO2-prepared selective-etch group. CLINICAL SIGNIFICANCE: By using a universal one-component adhesive system, marginal adaptation in enamel and in dentin depended on the preparation method and on the adhesive's application technique as well. When using lasers, Er:YAG in self-etch mode and CO2 9.3 µm in selective-etch mode total marginal adaptation showed results which were comparable to conventional bur preparation with selective-etch technique.


Assuntos
Colagem Dentária , Lasers de Estado Sólido , Dióxido de Carbono , Resinas Compostas , Preparo da Cavidade Dentária , Cimentos Dentários , Dentina , Adesivos Dentinários , Cimentos de Resina
14.
Stomatologiia (Mosk) ; 100(1): 34-43, 2021.
Artigo em Russo | MEDLINE | ID: mdl-33528954

RESUMO

THE AIM: Of the work is to develop and substantiate the method of minimally invasive complex orthodontic treatment of patients with constriction and deformation of the upper jaw in the period of permanent bite with the combined use of a bracket system, orthodontic devices for the expansion of the upper jaw and fractional photothermolysis to improve the effectiveness of complex treatment. MATERIALS AND METHODS: The results of complex treatment of patients with the deficiency of the upper jaw in the period of permanent bite are presented. Complex treatment consisted of orthodontic treatment using a bracket system, laser corticotomy, orthodontic devices for the expansion of the upper jaw. Ultrasound examination before and after the procedure was performed to obtain reliable results of laser impact on bone tissue. RESULTS: After conducting a clinical and radiological examination (using cone-beam computed tomography) of all patients and analyzing the data obtained, we have developed algorithms for therapeutic measures. As a result of orthodontic treatment aimed at the expansion of the upper jaw patients who underwent fractional photothermolysis procedure achieved the expansion of the upper jaw at both the dentoalveolar and skeletal levels. CONCLUSION: It was found that a comprehensive approach with minimally invasive effects can improve the effectiveness of treatment of patients with constriction and deformation of the upper jaw during the period of permanent bite and achieve stable treatment results.


Assuntos
Lasers de Estado Sólido , Adulto , Tomografia Computadorizada de Feixe Cônico , Oclusão Dentária , Humanos , Maxila , Resultado do Tratamento
15.
Adv Clin Exp Med ; 30(1): 7-15, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33529502

RESUMO

BACKGROUND: Reduced tooth structure in the pediatric and adolescent population is frequently restored with prefabricated zirconia crowns. On permanent teeth, these restorations may need to be removed and replaced with permanent restorations. OBJECTIVES: To explore and compare the use of 2 high-powered erbium lasers for removing prefabricated zirconia crowns from molar teeth as a non-invasive alternative to rotary instruments. MATERIAL AND METHODS: Twenty-five permanent molars were prepared to dentin and prefabricated all-ceramic zirconia crowns were fitted and cemented with resin modified glass ionomer (RMGI) cement. The teeth were randomly assigned into one of the 2 retrieval treatment groups: the erbium-doped yttrium, aluminum and garnet (Er:YAG) laser group (G1; n = 12) or the erbium, chromium-doped yttrium, scandium, gallium and garnet laser (Er,Cr:YSGG) laser group (G2; n = 13). The laser operating parameters for the Er:YAG laser were 300 mJ, 15 Hz, 4.5 W, and 50-microsecond pulse duration (SSP mode); for the Er,Cr:YSGG laser, they were 4.5 W, 15 Hz, 20 water/20 air, and 5 W, 15 Hz, 50 water/50 air, and 60-microsecond pulse duration (H mode). The experiment was repeated twice. The surface area and the volume of teeth and crowns were measured and the cement space was calculated. The retrieval time and temperature changes were tested and recorded. The data were analyzed with the t-test. The surfaces of the dentin and the crown from each group were further examined using scanning electron microscopy (SEM). RESULTS: The average time for crown removal using the Er:YAG laser was 1 min 32.7 s; for the Er,Cr:YSGG laser it was 3 min 13.9 s (p < 0.0001). The mean temperature changes were 1.41 ±1.36°C for the Er:YAG laser and 2.2 ±0.99°C for the Er,Cr:YSGG laser (p = 0.0321). The SEM examination showed no damage or major structural changes caused by treatment with either erbium-family laser. CONCLUSIONS: Both lasers are effective, non-invasive tools to remove prefabricated zirconia crowns cemented with resin cement and should be considered as viable alternatives to rotary instrumentation.


Assuntos
Lasers de Estado Sólido , Coroas , Humanos , Ítrio , Zircônio
18.
Braz Oral Res ; 35: e29, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33605359

RESUMO

This study evaluated how Er,Cr:YSGG laser, associated or not with 5% fluoride varnish, influences the surface roughness and volume loss of bovine root dentin submitted to erosive and/or abrasive wear. One hundred and twenty dentin specimens were divided into the groups: without preventive treatment (WPT), 5% fluoride varnish (FV); Er,Cr:YSGG laser irradiation (L), and varnish combined with laser (FV + L). The specimens (n = 10) were subdivided into: 1 = erosion (E); 2 = abrasion (A); and 3 = erosion followed by abrasion (E + A). The erosive solution used was a soft-drink (pH = 2.42 at 4ºC) applied in 5-min cycles twice a day for 10d. Abrasive wear involved brushing for 60s with an electric brush (1,600-oscillations/s) at a load of 2.0N. Surface roughness and volume loss were evaluated using a laser scanning confocal microscope. Roughness data were submitted to one-way ANOVA and Tukey post-hoc test. For volume loss, the Kruskal-Wallis and Dunn's post-hoc tests were used (α = 5%). The lowest values of roughness were found in the control areas of all subgroups (p > 0.05). In the experimental area, the [(WPT) + (E+A)] subgroup had a significantly higher roughness (5.712 ± 0.163 µm 2 ) than the other subgroups (p < 0.05). The L and (FV + L) groups had statistically similar roughness, regardless of the type of wear. The (FV + L) group had the lowest volume loss, regardless of the type of wear performed: [(FV + L) + (E)] = 7.5%, [(FV + L) + (A) = 7.3%, and [(FV + L) + (E + A)] = 8.1%. The subgroup [(WPT) + (E + A)] had the highest volume loss (52.3%). The proposed treatments were effective in controlling dentin roughness. Laser irradiation can be an effective method to increase root dentin resistance after challenges and limit problems related to non-carious lesions.


Assuntos
Lasers de Estado Sólido , Erosão Dentária , Animais , Bovinos , Dentina , Fluoretos , Lasers de Estado Sólido/uso terapêutico , Erosão Dentária/etiologia , Raiz Dentária , Escovação Dentária
19.
Niger J Clin Pract ; 24(2): 282-291, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33605921

RESUMO

Aims: To evaluate the effect of various aging periods and different surface preparation methods on microtensile bond strength (µTBS) for composite repair. Materials and Methods: One hundred twelve composite resin blocks were formed using a nanohybrid composite resin. The samples were distributed into four groups according to surface preparation methods (n = 28): control (sound composite blocks); Er, Cr: YSGG laser; air abrasion; silicone carbide. All samples were then divided into four subgroups according to various aging periods: (i) No aging, (ii) 10,000 thermocycling, (iii) 30,000 thermocycling, and (iv) 50,000 thermocycling. Following surface preparation and aging procedures, surface topography of one sample from each group was evaluated under scanning electron microscope (SEM). The repair composites were bonded to the sample surfaces, using a three-step etch&rinse adhesive. Finally, thirty beams of size 1 × 1 × 8 mm from each group were subjected to µTBS test and failure modes were determined. The data were analyzed using two-way ANOVA, Post-hoc Bonferroni, and Chi-square tests (P = 0.05). Results: When different surface preparation methods were evaluated together, no aging and 10,000 thermocycling groups displayed higher µTBS values (P < 0.05). When all aging periods were evaluated together, the surface preparation with air abrasion provided higher µTBS (P < 0.05). The interactions of various aging periods with different surface preparation methods revealed significant variations in repair µTBS (P < 0.05). There were statistically significant differences on failure mode distributions among surface preparation methods (P < 0.001). SEM evaluations provided valuable outcomes that help to comment on the µTBS findings. Conclusions: Different surface preparation methods, various aging periods, and the interaction of both affected the repair µTBS of the tested nanohybrid composite resin.


Assuntos
Colagem Dentária , Lasers de Estado Sólido , Adesivos , Resinas Compostas , Análise do Estresse Dentário , Humanos , Teste de Materiais , Cimentos de Resina , Propriedades de Superfície , Resistência à Tração
20.
Clin Oral Investig ; 25(5): 2737-2744, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33409689

RESUMO

OBJECTIVES: This study aimed to investigate the ability of the diode and Nd:YAG lasers to decrease postoperative pain/discomfort after intracanal application in vital and devital endodontic cases. MATERIAL AND METHODS: One hundred two patients with symptomatic irreversible pulpitis and asymptomatic necrotic pulps were selected and randomly divided into three groups. After chemomechanical preparation, Nd:YAG and diode laser was applied to first and second groups for final treatment of the root canals. In the control group, no further disinfection protocol was performed upon traditional procedures. Then all the teeth were obturated in the same appointment. Pre- and postoperative pain were recorded using the VAS at 0, 12th, 24th, 48th, and 72nd hours following the treatment Kruskal-Wallis and Dunn test. RESULTS: VAS scores were significantly the most at 12-h period compared with other time periods after treatment for all groups. There was no significant difference among Nd:YAG laser, diode laser, and control groups in non-vital cases (p > 0.05). In vital cases, Nd:YAG laser group represented significantly fewer scores compared with diode laser and control groups at 48-h period (p < 0.05). CONCLUSIONS: The processes involving the use of Nd:YAG and diode lasers after chemomechanical preparation was found to be equivalent in terms of postoperative pain intensity after completion of treatment in one session both in vital or non-vital cases except in vital cases in Nd:YAG group at 48 h. CLINICAL RELEVANCE: Adjunct clinical use of Nd:YAG or diode lasers to traditional chemomechanical preparation did not cause any improvement or deterioration on postoperative discomfort and pain in patients with symptomatic irreversible pulpitis and asymptomatic necrotic pulps.


Assuntos
Lasers de Estado Sólido , Pulpite , Necrose da Polpa Dentária/terapia , Humanos , Lasers Semicondutores/uso terapêutico , Lasers de Estado Sólido/uso terapêutico , Dor Pós-Operatória , Pulpite/cirurgia
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