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.24.3
T. Asai, Hiroaki Suzuki, Yui Enomoto, Manabu Shigeoka, Kousuke Matsumoto, Junichiro Takeuchi, T. Komori
This research performs clinical evaluation of vascular malformation of the oral region treated by photocoagulation with an Nd:YAG laser. We report on the clinical characteristics of 70 patients who were treated for vascular malformations of the oral region from 2004 to 2012 in our hospital. The patients consisted of 23 males and 47 females, with a median age of 49.7 years. The parts in which a lesion existed were : lips 34 cases, tongue 27 cases, buccal mucosa 7 cases, gum 3 cases, mouth floor 2 cases, and soft palate 1 case. Legion size was classified into two groups : a small size of < 15mm, and a large size of 15mm ≦ , and the necessity for hospitalization, in an operation and postoperative bleeding, swelling, pain, scar formation, nerve paralysis, postoperative infection, and the number of irradiation times were evaluated. Laser irradiation was performed under local anesthesia in all the cases. Critical bleeding did not occur. Postoperative swelling occurred in ten cases(16.7%)among the 60 cases with the size of < 15mm, and occurred in nine cases(64.3%)among the 14 cases with the size of 15mm ≦. Pain occurred in 11 cases but all cases of pain were slight. Scar formation occurred in three cases ; all these cases were 15mm ≦ in size. Nerve paralysis occurred in two cases that occurred in the buccal mucosa fold near mandibular premolars. The good therapeutic result was obtained without any critical complications arising except in external irradiation using an Nd:YAG laser. (J. Jpn. Soc. Laser Dent. 24:3 ~ 9, 2013 Reprint requests to Dr. ASAI) Key words= Nd:YAG laser, Vascular malformation, Photocoagulation キーワード= Nd:YAGレーザー,血管奇形,光凝固療法 〒 650-0017 神戸市中央区楠町 7-5-2 TEL 078-382-6213 FAX 078-382-6229 7-5-2 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan. TEL +81-78-382-6213 FAX +81-78-382-6229 優秀発表賞受賞論文 4 日本レーザー歯学会誌 24:3-9,2013
{"title":"Clinical Evaluation of 74 Vascular Malformations of the Oral Region Treated by Photocoagulation with an Nd:YAG Laser","authors":"T. Asai, Hiroaki Suzuki, Yui Enomoto, Manabu Shigeoka, Kousuke Matsumoto, Junichiro Takeuchi, T. Komori","doi":"10.5984/JJPNSOCLASERDENT.24.3","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.24.3","url":null,"abstract":"This research performs clinical evaluation of vascular malformation of the oral region treated by photocoagulation with an Nd:YAG laser. We report on the clinical characteristics of 70 patients who were treated for vascular malformations of the oral region from 2004 to 2012 in our hospital. The patients consisted of 23 males and 47 females, with a median age of 49.7 years. The parts in which a lesion existed were : lips 34 cases, tongue 27 cases, buccal mucosa 7 cases, gum 3 cases, mouth floor 2 cases, and soft palate 1 case. Legion size was classified into two groups : a small size of < 15mm, and a large size of 15mm ≦ , and the necessity for hospitalization, in an operation and postoperative bleeding, swelling, pain, scar formation, nerve paralysis, postoperative infection, and the number of irradiation times were evaluated. Laser irradiation was performed under local anesthesia in all the cases. Critical bleeding did not occur. Postoperative swelling occurred in ten cases(16.7%)among the 60 cases with the size of < 15mm, and occurred in nine cases(64.3%)among the 14 cases with the size of 15mm ≦. Pain occurred in 11 cases but all cases of pain were slight. Scar formation occurred in three cases ; all these cases were 15mm ≦ in size. Nerve paralysis occurred in two cases that occurred in the buccal mucosa fold near mandibular premolars. The good therapeutic result was obtained without any critical complications arising except in external irradiation using an Nd:YAG laser. (J. Jpn. Soc. Laser Dent. 24:3 ~ 9, 2013 Reprint requests to Dr. ASAI) Key words= Nd:YAG laser, Vascular malformation, Photocoagulation キーワード= Nd:YAGレーザー,血管奇形,光凝固療法 〒 650-0017 神戸市中央区楠町 7-5-2 TEL 078-382-6213 FAX 078-382-6229 7-5-2 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan. TEL +81-78-382-6213 FAX +81-78-382-6229 優秀発表賞受賞論文 4 日本レーザー歯学会誌 24:3-9,2013","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":"124963790","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}
{"title":"Response of Gingival Tissue Irradiated by CO2 Laser Approaching from the Periodontal Pocket Space","authors":"N. Matin, N. Taguchi, Naoko Ito, H. Kusakari","doi":"10.5984/JJPNSOCLASERDENT.10.61","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.10.61","url":null,"abstract":"感染した接合上皮と結合組織を無菌化することを目的として, 歯周ポケットにCO2レーザーを照射した際の歯肉組織の変化について検討した。実験には, デフォーカス型のCO2レーザーと6頭の雑種成犬を用いた。実験に先立ち, イヌには毎日15～20分のブラッシングを1週間続けて行った。この時点での歯周ポケットは, 最高で3mmであった。実験的な歯肉炎は, 軟食を与えてブラッシングも中止することにより引き起こし, 4週後には平均で1～2mm歯周ポケットが増加した。小臼歯と大臼歯の頬側歯肉45部位に, 0.3から2.5Jの範囲で出力を変化させて照射した。他の15部位については, 照射せずにコントロールとした。照射後7日と14日に, 臨床的および組織学的に歯肉組織の反応を観察した。照射直後には, 軽度の歯肉炎が観察された。組織の破壊程度は出力に関係しており, すなわち最大の組織破壊 (到達深度が1.4mmで創傷領域が0.33mm2) は最高出力 (2.5J) の場合に起こった。7日後には, 照射された歯肉の再上皮化がほぼ完全になされており, 結合組織にも新生したコラーゲン線維が形成されていた。特に0.5～1.5Jの照射出力の時は, コントロールよりも健康的な歯肉が臨床的にも組織学的にも認められた。この時期には, 炎症性の細胞は顕著に減少していた。14日後になると, レーザーを照射した歯肉は完全に治癒し, 傷害を受けた痕跡は全く観察されなかった。今回の実験から, 周囲組織を損傷せずに感染した接合上皮を無菌化することができるCO2レーザーの出力範囲を考察することができた。","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"6 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":"125581440","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-
{"title":"Three-dimensional Morphological Analysis of Unused Irradiation Tip Alteration with Er:YAG Laser by Micro-focus X-ray Computed Tomography","authors":"K. Takamori","doi":"10.5984/JJPNSOCLASERDENT.25.82","DOIUrl":"https://doi.org/10.5984/JJPNSOCLASERDENT.25.82","url":null,"abstract":"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-","PeriodicalId":187459,"journal":{"name":"Journal of Japanese Society for Laser Dentistry","volume":"15 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":"128247828","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.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.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.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}
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