Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.3.35
K. Kon
{"title":"In-vivo Study of Low-Power Laser Irradiation on New Bone Formation of Rat Carvaria Defect","authors":"K. Kon","doi":"10.5984/JJPNSOCLASERDENT.3.35","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.3.35","url":null,"abstract":"","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134347016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.24.61
A. Kameyama, Akiko Haruyama
: The violet laser diode was developed in 1996, and is now widely used as a light source for high-speed multilayer recording systems such as Blu-ray discs and HD-DVD systems. These lasers also show promise for medical applications, such as cutting soft tissue, laser acupuncture, tooth whitening, and detection of dental caries. The wavelength of the violet laser diode （approx. 405nm） may be suitable for hardening light-cured dental materials combined with some alternative photoinitiators. This article examines the light-curing efficiency of some commercial and three experimental dental resins by GaN-based violet laser diode determined in terms of ultimate micro-tensile strength, in comparison with curing by various commercial LED light-curing units. The spectral characteristics of the transmittance of contemporary dental adhesives and the emission of several commercially available light-curing units are also presented. The results revealed that violet laser diodes can be used as a light-curing source to initiate the polymerization of light-cured dental resins.
{"title":"Characteristics of Light-curing Resin-based Materials Cured by Violet Laser Diode","authors":"A. Kameyama, Akiko Haruyama","doi":"10.5984/JJPNSOCLASERDENT.24.61","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.24.61","url":null,"abstract":": The violet laser diode was developed in 1996, and is now widely used as a light source for high-speed multilayer recording systems such as Blu-ray discs and HD-DVD systems. These lasers also show promise for medical applications, such as cutting soft tissue, laser acupuncture, tooth whitening, and detection of dental caries. The wavelength of the violet laser diode （approx. 405nm） may be suitable for hardening light-cured dental materials combined with some alternative photoinitiators. This article examines the light-curing efficiency of some commercial and three experimental dental resins by GaN-based violet laser diode determined in terms of ultimate micro-tensile strength, in comparison with curing by various commercial LED light-curing units. The spectral characteristics of the transmittance of contemporary dental adhesives and the emission of several commercially available light-curing units are also presented. The results revealed that violet laser diodes can be used as a light-curing source to initiate the polymerization of light-cured dental resins.","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131285441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.25.148
K. Takamori, Yuko Tanaka, Wakiko Terauchi
: The clinical examination of dental caries is usually conducted by visual inspection and tactile palpation in conjunc-tion with radiographic examination. Last year, a new device for diagnosis, DIAGNOcam received pharmaceutical approval in Japan. In this apparatus, laser diode light（wavelength 780 nm）is transmitted from bone to tooth, and the images are cap-tured by a charged-coupled device. The detection of dental caries is based on the changes in the contrast of the obtained images compared with that of healthy tooth substances. Recent reports have indicated that this new device has an advantage of no radiation exposure and is effective for caries examination of permanent dentition. However, there is little data available on its efficacy for caries examination of primary teeth. The aim of this study was to evaluate the clinical efficiency of the DIAGNOcam in caries examination of primary teeth. We analyzed eight primary teeth from four individuals, and found that the DIAGNOcam was useful for caries examination of primary teeth. However, the initial caries was not clearly identified. This clinical study revealed that the DIAGNOcam is a useful tool for caries detection in primary as well as permanent teeth.
{"title":"The Case of Dental Caries Examination Using DIAGNOcam for Primary Teeth","authors":"K. Takamori, Yuko Tanaka, Wakiko Terauchi","doi":"10.5984/JJPNSOCLASERDENT.25.148","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.25.148","url":null,"abstract":": The clinical examination of dental caries is usually conducted by visual inspection and tactile palpation in conjunc-tion with radiographic examination. Last year, a new device for diagnosis, DIAGNOcam received pharmaceutical approval in Japan. In this apparatus, laser diode light（wavelength 780 nm）is transmitted from bone to tooth, and the images are cap-tured by a charged-coupled device. The detection of dental caries is based on the changes in the contrast of the obtained images compared with that of healthy tooth substances. Recent reports have indicated that this new device has an advantage of no radiation exposure and is effective for caries examination of permanent dentition. However, there is little data available on its efficacy for caries examination of primary teeth. The aim of this study was to evaluate the clinical efficiency of the DIAGNOcam in caries examination of primary teeth. We analyzed eight primary teeth from four individuals, and found that the DIAGNOcam was useful for caries examination of primary teeth. However, the initial caries was not clearly identified. This clinical study revealed that the DIAGNOcam is a useful tool for caries detection in primary as well as permanent teeth.","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133453264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.8.31
A. Aoki, Toshimoto Yamada, M. Otsuki, Hisashi Watanabe, J. Tagami, I. Ishikawa
The purpose of this study was to examine morphological and histopathological changes of the cervical enamel and root dentin of the treated cavity after root caries ablation using an Er: YAG laser. The prepared surfce using the Er: YAG laser was compared with that of conventional mechanical treatment. Ten extracted human teeth with root caries were used. Half of the carious lesion in each tooth was ablated with the Er: YAG laser, and the other was removed with a steel bur mounted on a low-speed micromotor. Er: YAG laser treatment was carefully performed under water spray using a combination of contact and non-contact irradiation modes. SEM and histopathological observations were performed for each treatment. The Er: YAG laser was able to ablate root carious lesion effectively without major thermal damage to the surrounding dental hard tisssues. However, the treated cavity margin tended to be irregular and unclear. Due to the careful irradiation technique, the irregularity of the cavity floor was relatively small and the residual structural change of the lased dentin was generally minimal except for the scarce highly-damaged area. The super ficial layer of the lased dentin showed deep staining with hematoxylin in the histological observation and typical microirregularities in the SEM examination. On the lased enamel, however, large microcraks and microirregularities were noted in the SEM evaluation.In order to perform effective caries removal and cavity preparation using the Er: YAG laser, further studies are required on the irradiation conditions and techniques, and on the conditioning of the lased surface for adhesive restorations. Especially, structural changes and finishing of the marginal enamel of the lased cavity should be investigated more minutely.(J. Jpn. Soc. Laser Dent. 8: 31-37, 1997, Reprint requests to Dr. AOKI)
{"title":"Observation of Cervical Enamel and Root Dentin of Treated Cavity after Root Caries Removal Using Er: YAG, Laser","authors":"A. Aoki, Toshimoto Yamada, M. Otsuki, Hisashi Watanabe, J. Tagami, I. Ishikawa","doi":"10.5984/JJPNSOCLASERDENT.8.31","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.8.31","url":null,"abstract":"The purpose of this study was to examine morphological and histopathological changes of the cervical enamel and root dentin of the treated cavity after root caries ablation using an Er: YAG laser. The prepared surfce using the Er: YAG laser was compared with that of conventional mechanical treatment. Ten extracted human teeth with root caries were used. Half of the carious lesion in each tooth was ablated with the Er: YAG laser, and the other was removed with a steel bur mounted on a low-speed micromotor. Er: YAG laser treatment was carefully performed under water spray using a combination of contact and non-contact irradiation modes. SEM and histopathological observations were performed for each treatment. The Er: YAG laser was able to ablate root carious lesion effectively without major thermal damage to the surrounding dental hard tisssues. However, the treated cavity margin tended to be irregular and unclear. Due to the careful irradiation technique, the irregularity of the cavity floor was relatively small and the residual structural change of the lased dentin was generally minimal except for the scarce highly-damaged area. The super ficial layer of the lased dentin showed deep staining with hematoxylin in the histological observation and typical microirregularities in the SEM examination. On the lased enamel, however, large microcraks and microirregularities were noted in the SEM evaluation.In order to perform effective caries removal and cavity preparation using the Er: YAG laser, further studies are required on the irradiation conditions and techniques, and on the conditioning of the lased surface for adhesive restorations. Especially, structural changes and finishing of the marginal enamel of the lased cavity should be investigated more minutely.(J. Jpn. Soc. Laser Dent. 8: 31-37, 1997, Reprint requests to Dr. AOKI)","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132600749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.21.192
S. Yokose, T. Naka
: Recently, osteocytes embedded in mineralized matrix have attracted much research attention as they are thought to translate mechanical loading into biochemical signals that affect bone （re） modeling. In order to understand the biological mechanisms by which osteocytes control bone formation and resorption under mechanical force, we conducted a study in the light of Wolff’s Law and Frost’s mechanical thresholds theory. The findings indicate that mechanical stress can be used for bone regeneration therapy. We have demonstrated that carbon dioxide laser irradiation induces bone formation, and that laser irradiation is a kind of mechanical force and so could be used for bone regeneration therapy. Here, we review how laser irradiation influences bone metabolism via osteocytes on the basis of Wolff’s Law and Frost’s mechanostat thresholds theory.
{"title":"Consideration of Bone Regeneration Induced by Laser Irradiation on the Basis of Wolff's Law and Frost's Mechanostat Thresholds","authors":"S. Yokose, T. Naka","doi":"10.5984/JJPNSOCLASERDENT.21.192","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.21.192","url":null,"abstract":": Recently, osteocytes embedded in mineralized matrix have attracted much research attention as they are thought to translate mechanical loading into biochemical signals that affect bone （re） modeling. In order to understand the biological mechanisms by which osteocytes control bone formation and resorption under mechanical force, we conducted a study in the light of Wolff’s Law and Frost’s mechanical thresholds theory. The findings indicate that mechanical stress can be used for bone regeneration therapy. We have demonstrated that carbon dioxide laser irradiation induces bone formation, and that laser irradiation is a kind of mechanical force and so could be used for bone regeneration therapy. Here, we review how laser irradiation influences bone metabolism via osteocytes on the basis of Wolff’s Law and Frost’s mechanostat thresholds theory.","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115951765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.9.60
Mako Miura, A. Aoki, F. Akiyama, N. Nakagawa, J. Tanaka, T. Yoshino, S. Oda, Hisashi Watanabe, I. Ishikawa
We have already reported the promising ability of the Er:YAG laser to ablate subgingival calculus in vitro. The purpose of this study was to examine the features of the laser-scaled root surface in comparison with the ultrasonic scaling. Twenty-four periodontally involved human extracted teeth with a band of subgingival calculus were used. The teeth were randomly divided into two groups for laser scaling and ultrasonic scaling. An Er:YAG Laser ML22 (Erwin(R);(R)HOYA Co. and J. Morita Mfg. Co., Japan) and an ultrasonic scaler (SOLFY(R); J. Morita Mfg. Co., Japan) were used in this study. Laser scaling was performed carefully in the contact and non-contact mode at the energy output of 40mJ/pulse (14.2J/cm2/pulse) and 10 pps under water spray, keeping the contact probe obliquely to the root surface. Ultrasonic scaling was performed at power 4 which is a standard power for clinical use. The features of the scaled site were observed by optical microscope or scanning electron microscope (SEM). The laser scaling was capable of removing subgingival calculus effectively. The laser-scaled area showed a slightly rough appearance macroscopically. Histologically , a thin thermally-damaged layer was observed on the lased root surface. The SEM examination of the lased root surface revealed a characteristic microroughness. This study suggests that the Er:YAG laser could be clinically appli cable for the debridement of the periodontally diseased root surfaces. Further studies are required on the evaluation of the attachment of the periodontal tissue to the lased root surface and the necessity of the 〒11318549東 京 都 文 京 区湯 島1-5-45 TEL03-5803-5488 FAX03-5803-0196 5-45,Yushima 1-chome,Bunkyo-ku ,Tokyo,113-8549,Japan.TEL03-5803-5488 FAX03-5803-0196 1998年6月 三浦 真子 ・他Er:YAGレ ーザーによる歯肉縁下歯石のスケー リング後の根面の性状 について 61 treatment for removing the superficial layer of the lased root surface. (J. Jpn. Soc. Laser Dent. 9:60•`67, 1998 Reprint requests to Dr. MIURA) Key words=Scaling,Er:YAG Laser,Ultrasonic scaler キ ー ワ ー ド=ス ケ ー リン グ,Er:YAGレ ー ザ ー,超 音 波 ス ケ ー ラ ー
{"title":"Observation of the Root Surface after Subgingival Calculus Scaling by Er: YAG Laser Irradiation: Comparison with Ultrasonic Scaling","authors":"Mako Miura, A. Aoki, F. Akiyama, N. Nakagawa, J. Tanaka, T. Yoshino, S. Oda, Hisashi Watanabe, I. Ishikawa","doi":"10.5984/JJPNSOCLASERDENT.9.60","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.9.60","url":null,"abstract":"We have already reported the promising ability of the Er:YAG laser to ablate subgingival calculus in vitro. The purpose of this study was to examine the features of the laser-scaled root surface in comparison with the ultrasonic scaling. Twenty-four periodontally involved human extracted teeth with a band of subgingival calculus were used. The teeth were randomly divided into two groups for laser scaling and ultrasonic scaling. An Er:YAG Laser ML22 (Erwin(R);(R)HOYA Co. and J. Morita Mfg. Co., Japan) and an ultrasonic scaler (SOLFY(R); J. Morita Mfg. Co., Japan) were used in this study. Laser scaling was performed carefully in the contact and non-contact mode at the energy output of 40mJ/pulse (14.2J/cm2/pulse) and 10 pps under water spray, keeping the contact probe obliquely to the root surface. Ultrasonic scaling was performed at power 4 which is a standard power for clinical use. The features of the scaled site were observed by optical microscope or scanning electron microscope (SEM). The laser scaling was capable of removing subgingival calculus effectively. The laser-scaled area showed a slightly rough appearance macroscopically. Histologically , a thin thermally-damaged layer was observed on the lased root surface. The SEM examination of the lased root surface revealed a characteristic microroughness. This study suggests that the Er:YAG laser could be clinically appli cable for the debridement of the periodontally diseased root surfaces. Further studies are required on the evaluation of the attachment of the periodontal tissue to the lased root surface and the necessity of the 〒11318549東 京 都 文 京 区湯 島1-5-45 TEL03-5803-5488 FAX03-5803-0196 5-45,Yushima 1-chome,Bunkyo-ku ,Tokyo,113-8549,Japan.TEL03-5803-5488 FAX03-5803-0196 1998年6月 三浦 真子 ・他Er:YAGレ ーザーによる歯肉縁下歯石のスケー リング後の根面の性状 について 61 treatment for removing the superficial layer of the lased root surface. (J. Jpn. Soc. Laser Dent. 9:60•`67, 1998 Reprint requests to Dr. MIURA) Key words=Scaling,Er:YAG Laser,Ultrasonic scaler キ ー ワ ー ド=ス ケ ー リン グ,Er:YAGレ ー ザ ー,超 音 波 ス ケ ー ラ ー","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115974269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.25.140
Mari M. Saito, H. Yamaguchi, Kazuyuki Kobayashi, Yuka Kaburaki, Shintaro Kurose, Hozumi Watanabe, T. Kawai, A. Yashima, Satoshi Shirakawa, T. Nagano, K. Gomi
: We have reported pain relieving effects and blood flow changes in dental pulp by laser irradiation. The aim of this study was to investigate the threshold of thermal sensation and blood flow in dental pulp by low-power Nd:YAG laser irradiation to the mental foramen. Medicine with normal right lower canines received low-power Nd:YAG laser irradiation on the left mental foramen. Blood flow and the threshold of thermal sensation at the right lower canine were measured and compared with those at rest. Results: Nd:YAG laser irradiation to the left mental foramen elevated blood flow in the dental pulp below the right lower canine （p ＜ 0.05）. After irradiation, the blood flow decreased rapidly and became equal to that at rest. The threshold of thermal sensation was also elevated by laser irradiation （p ＜ 0.05）. Discussion: Nd:YAG laser irradiation on the mental foramen resulted in increases of blood flow in the dental pulp and the threshold of thermal sensation, suggesting that it may be effective, for example, for relieving pain by suppressing the sympa-thetic nerve.
{"title":"Effect of Nd:YAG Laser Irradiation to Mental Area on Human Dental Pulp Blood Flow Rate and Pulp Temperature Sensitivity Threshold Level","authors":"Mari M. Saito, H. Yamaguchi, Kazuyuki Kobayashi, Yuka Kaburaki, Shintaro Kurose, Hozumi Watanabe, T. Kawai, A. Yashima, Satoshi Shirakawa, T. Nagano, K. Gomi","doi":"10.5984/JJPNSOCLASERDENT.25.140","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.25.140","url":null,"abstract":": We have reported pain relieving effects and blood flow changes in dental pulp by laser irradiation. The aim of this study was to investigate the threshold of thermal sensation and blood flow in dental pulp by low-power Nd:YAG laser irradiation to the mental foramen. Medicine with normal right lower canines received low-power Nd:YAG laser irradiation on the left mental foramen. Blood flow and the threshold of thermal sensation at the right lower canine were measured and compared with those at rest. Results: Nd:YAG laser irradiation to the left mental foramen elevated blood flow in the dental pulp below the right lower canine （p ＜ 0.05）. After irradiation, the blood flow decreased rapidly and became equal to that at rest. The threshold of thermal sensation was also elevated by laser irradiation （p ＜ 0.05）. Discussion: Nd:YAG laser irradiation on the mental foramen resulted in increases of blood flow in the dental pulp and the threshold of thermal sensation, suggesting that it may be effective, for example, for relieving pain by suppressing the sympa-thetic nerve.","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114905307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.5.41
Hiroyuki Suzuki, Hidetoshi Tanaka, K. Hashimoto
This study was carried out to clarify the effects of low-energy laser, diode laser (wavelength: 890nm, output power: 0.339mW) irradiation on osteoblastic cell activity. In addition, we investigated the influence of presence of the implant body on osteoblastic cells.We used the human osteoblastic cells (HUO9, O9N2, YT-48). These cells were cultured in a RPMI-1640 medium supplemented with 2mM ascorbic acid, 2mM α-glycerophosphate and 10% fetal calf serum. Irradiation time (density) were 1min (0.6mJ/cm2), 2min (1.2mJ/cm2), 3min (1.8mJ/cm2), 5min (3.0mJ/cm2), 7min (4.2mJ/cm2), 10min (6.0mJ/cm2), 12min (7.2mJ/cm2), 15min (9.0mJ/cm2).As the result, proliferation of these cell were not stimulated by the laser irradiation, but the presence of the implant body were not inhibited them. Alkaline phosphatase activity of HUO9 and O9N2 were decreased by laser irradiation (irradiation density, more than 6.0mJ/cm2). But YT-48 was not inhibited.
{"title":"The Study on the Effect of Diode Laser on Cultured Osteoblastic Cells","authors":"Hiroyuki Suzuki, Hidetoshi Tanaka, K. Hashimoto","doi":"10.5984/JJPNSOCLASERDENT.5.41","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.5.41","url":null,"abstract":"This study was carried out to clarify the effects of low-energy laser, diode laser (wavelength: 890nm, output power: 0.339mW) irradiation on osteoblastic cell activity. In addition, we investigated the influence of presence of the implant body on osteoblastic cells.We used the human osteoblastic cells (HUO9, O9N2, YT-48). These cells were cultured in a RPMI-1640 medium supplemented with 2mM ascorbic acid, 2mM α-glycerophosphate and 10% fetal calf serum. Irradiation time (density) were 1min (0.6mJ/cm2), 2min (1.2mJ/cm2), 3min (1.8mJ/cm2), 5min (3.0mJ/cm2), 7min (4.2mJ/cm2), 10min (6.0mJ/cm2), 12min (7.2mJ/cm2), 15min (9.0mJ/cm2).As the result, proliferation of these cell were not stimulated by the laser irradiation, but the presence of the implant body were not inhibited them. Alkaline phosphatase activity of HUO9 and O9N2 were decreased by laser irradiation (irradiation density, more than 6.0mJ/cm2). But YT-48 was not inhibited.","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123982983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/jjpnsoclaserdent.27.13
Chikako Hirai, Himeka Matsumoto, Tomoko Kihara, Hiromi Sato, K. Inamoto, Y. Yoshimine
: The aim of this study was to compare the efficacy of three irrigation techniques: laser-activated irrigation, ultrasonic irrigation, and conventional syringe irrigation, in removing debris and smear layer from the root canal wall. Bovine root dentin was used. The canal surface was ground with a carbide bar to make a smear layer. Thereafter, the specimens were set at an apical area of the simulated root canal model. As irrigation solution, sodium hypochlorite and EDTA were used in this order. By scanning electron microscopy, laser-activated irrigation and ultrasonic irrigation samples showed effective smear layer removal and open dentinal tubules. In contrast, smear plugs and debris remained in the syringe irrigation samples. In conclusion, irrigant activation using laser and ultrasonic devices might contribute to root canal cleanliness.
{"title":"The Effects of Er:YAG Laser-activated Irrigation on the Root Canal Wall","authors":"Chikako Hirai, Himeka Matsumoto, Tomoko Kihara, Hiromi Sato, K. Inamoto, Y. Yoshimine","doi":"10.5984/jjpnsoclaserdent.27.13","DOIUrl":"https://doi.org/10.5984/jjpnsoclaserdent.27.13","url":null,"abstract":": The aim of this study was to compare the efficacy of three irrigation techniques: laser-activated irrigation, ultrasonic irrigation, and conventional syringe irrigation, in removing debris and smear layer from the root canal wall. Bovine root dentin was used. The canal surface was ground with a carbide bar to make a smear layer. Thereafter, the specimens were set at an apical area of the simulated root canal model. As irrigation solution, sodium hypochlorite and EDTA were used in this order. By scanning electron microscopy, laser-activated irrigation and ultrasonic irrigation samples showed effective smear layer removal and open dentinal tubules. In contrast, smear plugs and debris remained in the syringe irrigation samples. In conclusion, irrigant activation using laser and ultrasonic devices might contribute to root canal cleanliness.","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"abs/2108.10205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124904296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.5984/JJPNSOCLASERDENT.25.82
K. Takamori
The Er:YAG laser is useful for not only removing dental caries, but also for oral surgery, endodontics, and periodontal therapies, and has many advantages compared with traditional treatments. The irradiation conditions of wavelength, output power, and pulse repetition are important for treatment efficacy. Moreover, morphological changes to the irradiated tip are a major factor affecting the adjustment of laser power to specific tissues. However, there is insufficient data regarding tip alterations during treatment. The aim of this study was to conduct a morphological analysis of tips using micro focus X-ray computed tomography (micro-CT). Quartz contact tips for cavity preparation or for soft tissue surgery were analyzed. MicroCT was performed on five unused tips each. Micro-CT images were obtained under the following conditions : tube voltage 90 or 100kV; current 100 or 200μA; and slice width 0.16 or 0.08mm, respectively. The obtained 3D reconstructions were analyzed using software. The 3D data was correctly obtained from the shape of the contact tips by micro-CT. These results revealed that micro-CT is useful for 3D morphological analysis of irradiated tips. (J. Jpn. Soc. Laser Dent. 25:82 ~ 84, 2014 Reprint requests to Dr. TAKAMORI) Key words= Er:YAG laser, Irradiation tip, Three dimensional morphological analysis, Micro focus X-RAY computed to-
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