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Dive into the research topics where Masatake Tsunoda is active.

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Featured researches published by Masatake Tsunoda.


Lasers in Medical Science | 2011

Light-curing of dental resins with GaN violet laser diode: The effect of photoinitiator on mechanical strength

Atsushi Kameyama; Hitoshi Hatayama; Junji Kato; Akiko Haruyama; Hiromi Teraoka; Yasuaki Takase; Masao Yoshinari; Masatake Tsunoda

The purpose of this study was to evaluate whether a Gallium Nitride (GaN) -based violet laser diode (VLM500) could be used as a light source for light-cured dental resins. Three experimental unfilled resins containing different photoinitiators (camphorquinone, CQ; phenyl propanedione, PPD; or mono acylphosphineoxide, MAPO) were evaluated. These resins were light-cured with a VLM500 laser diode, and their ultimate micro-tensile strengths (μTS) were compared to those cured with three different LED light sources (Curenos, G-Light Prima-normal mode and G-Light Prima-PL mode). The VLM500 produced high μTS values in all three resins, and we concluded that this violet laser diode can be used as a light source for light-cured dental resin materials.


Bio-medical Materials and Engineering | 2011

Light-curing efficiency of dental adhesives by gallium nitride violet-laser diode determined in terms of ultimate micro-tensile strength

Atsushi Kameyama; Junji Kato; Jan De Munck; Hitoshi Hatayama; Akiko Haruyama; Masao Yoshinari; Yasuaki Takase; Bart Van Meerbeek; Masatake Tsunoda

The purpose of this study was to evaluate whether violet-laser diode (VLD) can be used as light-curing source. The ultimate (micro-)tensile strength (μTS) of three adhesives was determined when cured by VLD in comparison with curing by two different types of commercial LED light-curing units. One VLD (VLM 500) and two LED units (Curenos and G-Light Prima) were used to cure the adhesive resin of the two-step self-etch adhesives Clearfil SE Bond, Tokuso Mac Bond II, and FL-Bond II. A 0.6-mm thick acrylic mould was filled with adhesive resin and cured for 60 s. After 24-h water storage, specimens were trimmed into an hourglass shape with a width of 1.2 mm at the narrowest part, after which the μTS was determined (n=10). In addition, the light transmittance of each adhesive was characterized using a UV-vis-NIR spectrometer. No significant difference in curing efficiency between VLD and LED were observed for both Tokuso Mac Bond II and FL-Bond II (p>0.05). For Clearfil SE Bond, the μTS of VLD-cured specimens was higher than that of the specimens cured by the LED Curenos unit (p<0.05). Spectrometry revealed that this marked difference must be attributed to a different light transmittance of Clearfil SE Bond for visible blue light versus for the lower area of UV and visible violet light. In conclusion, A GaN-based violet laser diode can be used as light-curing source to initiate polymerization of dental resins.


Clinical, Cosmetic and Investigational Dentistry | 2010

Influence of handpiece maintenance sprays on resin bonding to dentin

Toyotarou Sugawara; Atsushi Kameyama; Akiko Haruyama; Takumi Oishi; Nobuyuki Kukidome; Yasuaki Takase; Masatake Tsunoda

Objective To investigate the influence of maintenance spray on resin bonding to dentin. Materials and methods The crown of extracted, caries-free human molars was transversally sectioned with a model trimmer to prepare the dentin surfaces from mid-coronal sound dentin, and then uniformly abraded with #600 silicon carbide paper. The dentin surfaces were randomly divided into three groups: oil-free spray group where maintenance cleaner for air bearing handpieces was sprayed onto the dentin surface for 1 s and rinsed with water spray for 30 s; oil-containing spray group where maintenance cleaner for micro motor handpieces was sprayed onto the dentin surface for 1 s and rinsed with water spray for 30 s; and control group where the surface was rinsed with water spray for 30 s and then air-dried. These surfaces were then bonded with Clearfil SE Bond (Kuraray Medical), and resin composite (Clearfil AP-X, Kuraray Medical) build-up crowns were incrementally constructed on the bonded surfaces. After storage for 24 h in 37°C water, the bonded teeth were sectioned into hour-glass shaped slices (0.7-mm thick) perpendicular to the bonded surfaces. The specimens were then subjected to microtensile bond strength (μTBS) testing at a crosshead speed of 1.0 mm/min. Data were analyzed with one-way ANOVA and the Tukey-Kramer test. Results Maintenance spray-contaminated specimens (oil-free and oil-containing spray groups) showed significantly lower μTBS than control specimens (P < 0.05). However, there was no significant difference between the spray-contaminated groups (P > 0.05). Conclusion Maintenance spray significantly reduces the bond strength of Clearfil SE Bond to dentin.


International Journal of Dentistry | 2015

Correlations between Perceived Oral Malodor Levels and Self-Reported Oral Complaints

Atsushi Kameyama; Kurumi Ishii; Sachiyo Tomita; Chihiro Tatsuta; Toshiko Sugiyama; Yoichi Ishizuka; Toshiyuki Takahashi; Masatake Tsunoda

Objectives. Even though objective data indicating the absence of oral malodor are presented to patients, they may be skeptical about the results, possibly due to the presence of some discomfort in the oral cavity. The objective of this study was to investigate whether there is an association among self-perceptions of oral malodor, oral complaints, and the actual oral malodor test result. Materials and Methods. Questions concerning self-perceptions of oral malodor and subjective intraoral symptoms were extracted from a questionnaire on oral malodor completed by 363 subjects who visited the clinic for oral malodor of Tokyo Dental College Chiba Hospital and gave consent to this study. In addition, the association of self-perception of oral malodor with values obtained after organoleptic and OralChroma measurement was analyzed. Results. No correlation between 195 subjects (54%) who were judged “with oral malodor” (organoleptic score of ≥1) and 294 subjects (81.6%) who had a self-perceptions of oral malodor was observed. Self-perception of oral malodor was significantly correlated with tongue coating (p = 0.002) and a strange intraoral taste (p = 0.016). Conclusions. Subjects with a self-perception of oral malodor were not necessarily consistent with those actually having an oral malodor. In addition, it was suggested that patients became aware of oral malodor when they felt oral complaints.


Nihon Shishubyo Gakkai Kaishi (journal of The Japanese Society of Periodontology) | 1992

電動歯ブラシのプラーク除去効果に関する研究(第2報) : 各種電動歯ブラシのプラーク除去効果

Taneaki Nakagawa; Atsushi Shimada; Hiroyuki Miyashita; Akiteru Sakashita; Hidekazu Kitamura; Midori Ooshima; Nobuhiro Shima; Masatake Tsunoda; Satoru Yamada

本研究は, 各種電動歯ブラシを用い, ヘッド部の動きの違いによるプラーク除去効果および手用歯ブラシとの比較検討を行った。被験者は東京歯科大学学生 (平均23.6歳) 10名とし, 刷掃時間は3分とした。プラークの付着状態を各条件のブラッシング前後で比較した結果, 毛束反復回転式の電動歯ブラシが最も高いプラーク除去効果を示し, 特に隣接面部, 舌面部において高い刷掃効果を示した。円形植毛部反復回転式も手用歯ブラシと比較して統計学的に有意に高い除去効果を示し, 隣接面における刷掃効果も比較的高かった。他の電動歯ブラシも手用歯ブラシと同程度以上のプラークの除去効果を示した。本研究の結果, 各種電動歯ブラシは手用歯ブラシと同程度かそれ以上のプラーク除去率を示し, プラークコントロールの一手段として有効であることが示唆された。


The Bulletin of Tokyo Dental College | 1990

Bactericidal effects on subgingival bacteria of irrigation with a povidone-iodine solution (Neojodin).

Taneaki Nakagawa; Atsushi Saito; Y. Hosaka; Satoru Yamada; Masatake Tsunoda; Toru Sato; Tatsuya Ishikawa


The Bulletin of Tokyo Dental College | 1990

Clinical, microbiological, and immunological studies following initial preparation in adult periodontitis.

T. Nakagawa; Satoru Yamada; Masatake Tsunoda; Toru Sato; Naito Y; Ichiro Takazoe; Okuda K


The Bulletin of Tokyo Dental College | 2008

Long-term observation of porous sapphire dental implants.

Toshiyuki Takahashi; Toru Sato; Ryuichi Hisanaga; Otoaki Miho; Yuta Suzuki; Masatake Tsunoda; Kan-Ichi Nakagawa


Journal of the American Dental Association | 2011

The effects of three dry-field techniques on intraoral temperature and relative humidity

Atsushi Kameyama; Masako Asami; Akio Noro; Hirokazu Abo; Yoshito Hirai; Masatake Tsunoda


The Bulletin of Tokyo Dental College | 2011

Character Traits of Malodor Patients

Toshiko Sugiyama; Atsushi Kameyama; Daiki Yamakura; Kazuki Morinaga; Masatake Tsunoda

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