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Volume 50 (2008)
- Issue 4 Pages 229-
- Issue 3 Pages 165-
- Issue 2 Pages 95-
- Issue 1 Pages 1-
Volume 50, Issue 2
Displaying 1-5 of 5 articles from this issue
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A Foreword
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Yukihiro NumabeArticle type: A Foreword
2008 Volume 50 Issue 2 Pages 95-96
Published: 2008
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSDownload PDF (174K)
Original Work
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Yuko Morozumi, Atsunori Sugawara, Toshiyuki Iwahori, Akiko Miyazaki, S ...Article type: Original Work
2008 Volume 50 Issue 2 Pages 97-103
Published: 2008
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSThe purpose of this study was to analyze the plaque removal efficacy of a sonic-powered toothbrush which is capable of applying brushing pressure at a certain frequency, that would produce mechanical resonance. We studied the factors which may improve the cleaning efficacy, such as the operational frequency and brushing pressure of such toothbrushes. We focused on two specific operational frequencies (High speed/Low speed) which would cause mechanical resonance, and used another frequency (Intermediate speed) which would not cause mechanical resonance as reference. We evaluated these factors using our brushing machine, and evaluated the cleaning efficacy by measuring the percent removal of artificial plaques in a dental model via imaging analysis. The results revealed that under the brushing pressure of 100gf, the efficiency of plaque removal was in the order, from the highest to the lowest, of High speed, Low speed and Intermediate speed. Operating the toothbrush at a certain speed causing mechanical resonance would enlarge the amplitude of the vibration, so that the plaque removal efficiency would be greater at the Low speed than at the Intermediate speed. On the other hand, under the brushing pressure 250gf, the plaque removal efficiency was in the order, from the highest to the lowest, of High speed, Intermediate speed and Low speed. The higher brushing pressure minimizes the motion of the bristle, so that the effect of the mechanical resonance is also minimized. We suggest that operating the sonic power toothbrush at a certain frequency that would cause mechanical resonance can improve the plaque removal efficiency, and our results indicates a beneficial effect even at the Low speed.
Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 50(2) : 97-103View full abstractDownload PDF (944K) -
Tomohisa Ogawa, Etsuko Murakashi, Takako Arai, Masako Iino, Keiko Enom ...Article type: Original Work
2008 Volume 50 Issue 2 Pages 104-111
Published: 2008
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSCompared with the conventional toothbrush in which the bristles are anchored to the brush head, the anchorless toothbrush has a thinner brush head and it is considered to be easier in the mouth. We report herein on a clinical evaluation between two types of novel anchorless toothbrush. The purpose of this study was to compare the plaque removal efficacy of three toothbrushes used in the scrubbing brushing method: Toothbrush S had a 2.5 mm brush head thickness, 9.0 mm bristle height and end-tapered bristles with an anchorless brush filling; Toothbrush N had a 5.0 mm brush head thickness, 9.0m m bristle height and end-tapered bristles; and Toothbrush M had a 2.9 mm brush head thickness, 9.5 mm bristle height and end-rounded bristles with anchorless brush filling. Plaque was evaluated on 12 teeth which consisted of Ramfjörd teeth (16,21,24,36,41,44) and the other molars (17,26,27,37,46,47). As the subjects with the standardized tooth brushing technique, 26 students in the second year of the dental hygienist course were enrolled in this study. The results showed that the rate of plaque reduction of toothbrush S was the highest followed by those of toothbrush N and toothbrush M in decreasing order. Especially in molars, toothbrush S (46.9 %) showed a higher rate of plaque reduction compared with toothbrush M (32.4 %) and N (33.2 %). The difference in the rate of plaque reduction following the use of toothbrush S was statistically significantly less than toothbrush M (p< 0.05). These results indicated that the higher plaque removal efficacies of toothbrush S compared with toothbrush N might have been achieved by the bristle height, and the plaque removal efficacy is clear particularly in the molars.
Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 50(2) : 104-111, 2008.View full abstractDownload PDF (969K) -
Takayuki Morimoto, Shuntaro Hori, Kenji Nemoto, Yukiko Koke, Osamu Yam ...Article type: Original Work
2008 Volume 50 Issue 2 Pages 112-120
Published: 2008
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSPatients with melanin pigmentation of the gingiva were treated by the Er:YAG Laser (EL) and the Phenol-Alcohol procedure (PA). The clinical prognosis of the melanin pigment removal was evaluated longitudinally with a dental chromameter. Also the differences in the pigment removal effects between smokers and non-smokers were evaluated. Subjects were 10 patients (5 smokers, 5 non-smokers; mean age, 23 years) who gave prior informed consent for this study. All had melanin pigmentation of the upper anterior gingiva, but no systemic disease. The upper anterior gingival tissue was treated with EL (HOYA Photonics co.) on the right side and PA on the left side. At 1 and 2 weeks, and 1, 2, 3, 6 and 12 months after the melanin pigment removal, the gingival color of the treated areas was measured and compared with that prior to the treatment. The gingival color was rated as delta E, delta L, delta a and delta b. The smoker group showed recurrence determination to decreasing of delta L and E in the EL area from 3 months and in the PA area from 6 months. Also the non-smoker group showed recurrence determination to decreasing of the delta L and E in both EL and PA areas from 6 months.
Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 50(2) : 112-120,2008.View full abstractDownload PDF (1370K)
Case Report
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Kosuke Muraoka, Tatsurou Tanaka, Kohzoh Kubota, Yasuhiro Morimoto, Mak ...Article type: Case Report
2008 Volume 50 Issue 2 Pages 121-128
Published: 2008
Released on J-STAGE: August 07, 2008
JOURNAL FREE ACCESSWe report an interesting case in which improvement of occlusal function in a chronic periodontitis patient was able to be confirmed by the blood oxygenation level-dependent (BOLD) signal on functional magnetic resonance imaging (fMRI). A 60-year-old female requiring periodontal treatment was diagnosed as having moderate periodontitis by clinical and radiographic examinations. Her past history includedhyperlipemia. The initial treatment was set as only tooth brushing instruction, scaling and root planing, however occlusal adjustment was not performed at all. Following written informed consent from the subject, ucclusal force and fMRI were examined at the first and reevaluation examinations. A weak BOLD signal was found only in the primary somatosensory area of the cerebral cortex on the side during biting at the firstfMRI examination. On the reevaluation, the BOLD signal indicating cerebral blood flow on fMRI simultaneously showed a clear increase and symmetry. These fMRI results suggested that the occlusal condition had changed from a weak bite on only one side to a strong bite on both sides following only the initial treatment regimen.
Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 50(2) : 121-128,2008.View full abstractDownload PDF (1314K)
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