Taeko Murakami

Aichi Gakuin University, Nagoya, Aichi, Japan

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Publications (13)12.89 Total impact

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    ABSTRACT: Abstract Objective: The aim of this study was to investigate the effect of laser irradiation on root surface demineralization caused by local drug delivery systems (DDS), and to evaluate the effect of sealing on drug retention. Background data: The duration of supportive periodontal treatment (SPT) has increased with increasing life expectancy. Repeated root planing and DDS application during SPT should be reconsidered with regard to their effects on the root surface. Methods: Extracted human teeth were collected, cut into 3×3×2 mm root dentin specimens, and divided randomly into eight groups with various combinations of Nd:YAG laser power (0, 0.5, 1, and 2 W), with and without DDS (minocycline HCl). Specimen microhardness and calcium (Ca) solubility were measured after treatment. The specimens (control and laser and DDS groups) were examined by scanning electron microscopy. Forty SPT patients were recruited, to assess the effect of periodontal pocket sealing on drug retention. Results: Laser irradiation increased the microhardness of root specimens in an energy-dependent manner. Calcium solubilities decreased from the 0 W+DDS group to the 2.0 W+DDS group. The mean Ca solubilities in the 1.0 W+DDS and 2.0 W+DDS groups were significantly lower than in the 0 W+DDS group (p<0.01, p<0.001, respectively). Laser irradiation counteracted the softening effect of DDS. Morphologic change was observed in the 2W+DDS group; however, no morphologic changes were observed in the control and the 1W+DDS groups. The mean concentration of minocycline in the periodontal pocket 24 h after application was 252.79±67.50 μg/mL.Conclusions: Laser irradiation of the root surface inhibited the softening and decalcification caused by minocycline HCl. Sealing the periodontal pockets effectively improved drug retention. These results suggest that the combination of laser irradiation and DDS could benefit patients receiving repeated SPT.
    No preview · Article · Nov 2013 · Photomedicine and laser surgery
  • Taeko Murakami · N Narita · T Shibata · H Nakagaki · H Koga · M Nishimuta
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    ABSTRACT: This study was conducted to estimate the relative contribution of particular foods and drinks to dietary fluoride intake in 94 preschool Japanese children in low-fluoride areas. The mean daily fluoride intake from all beverages (548 +/- 162 g) was 0.108 mg (SD = 0.082), accounting for 37% of the total dietary fluoride; tea beverages showed the highest value, 0.093 mg (SD = 0.081), 32%. That from staple food and side dishes was 0.183 mg (SD = 0.146), 63%, followed by cereals (12%), fish (8%) and bean products (5%). In conclusion, the contribution of beverages excluding tea to dietary fluoride intake is small in Japanese children.
    No preview · Article · Sep 2009 · Caries Research
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    ABSTRACT: The present study aimed to determine whether there is excessive mean daily intake of phosphorus in 3- to 5-year-old Japanese children and to ascertain relationships between phosphorus intake and various food and beverage groups. Subjects comprised of 90 children, with 15 boys and 15 girls in each age group from 3 to 5 years. The duplicate-diet technique was used to ascertain total dietary intake, including snacks and beverages over a 24-h period on 3 separate days from summer 1999 to winter 2000. After wet ashing food samples, phosphorus was quantified by colourimetry using a spectrophotometer. Median and 25th-75th percentile daily phosphorus intake for 3- to 5-year-old Japanese children was 674 mg (534-890 mg), and phosphorus intake correlated with the intake of many food groups and was closely correlated with total daily intake of food and beverage (rs=0.64). In addition, phosphorus intake correlated with the intake of magnesium and calcium (rs>=0.6, p<0.001). When assessed based on dietary reference intakes for the US, maximum intake did not exceed the tolerable upper intake level in any of the young children, but phosphorus intake was not more than the estimated average requirement (EAR) in 4.4% of subjects, which exceeded the target of 2.5% for the US EAR. We concluded that there is a risk of insufficient phosphorous intake, rather than excessive intake, for 4.4% of 3- to 5-year-old Japanese children.
    Preview · Article · Sep 2009 · Asia Pacific Journal of Clinical Nutrition
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    ABSTRACT: The aim was to clarify the association between dental panoramic radiography measures of mandibular inferior cortical shape and biochemical markers of bone turnover in elderly men and women. Subjects were 80-year-old men (n = 85) and women (n = 153). Mandibular cortical shape and width were evaluated on dental panoramic radiographs. Bone formation and resorption, respectively, were estimated by serum levels of carboxy-terminal propeptide of type I collagen (PICP) and serum type I collagen carboxy-terminal telopeptide (ICTP). Eroded cortices of the mandible were significantly associated with increased serum PICP levels (P = .005) in women. Lower mandibular cortical width quartiles were also significantly associated with increased serum PICP levels in men (P = .020) and women (P = .006). Mandibular inferior cortical measures detected on dental panoramic radiographs may be associated with bone formation rates and be useful in predicting osteoporosis in elderly Japanese men and women.
    No preview · Article · Jul 2009 · Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
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    ABSTRACT: This study aimed to measure and evaluate the intakes for the four trace elements of Fe, Zn, Mn, and Cu in 3- to 5-y-old Japanese preschool children. The study group consisted of a total of 90 3- to 5-y-old children living in Yokkaichi, Mie, Japan. Diet samples were collected by the duplicate-portion technique on 3 d at three different seasons between summer in 1999 and winter in 2000. The medians of annual mean daily intakes (25th-75th percentile) of Fe, Zn, Mn, and Cu in the 3- to 5-y-old children were 3.1 mg (2.4 to 3.6), 4.0 mg (3.4 to 4.7), 1.3 mg (1.1 to 1.6), and 0.45 mg (0.35 to 0.56), respectively. The annual mean value of the total daily diet intake had significant correlations with the Fe, Zn, Mn and Cu intakes (Spearman's r=0.55, 0.67, 0.58, and 0.55, respectively; p<0.001 for all). There were significant correlations between each mineral intake. The Zn and Mn intakes had differences among ages (p=0.003 and 0.005, respectively) and the Zn intake significantly differed between boys and girls (p=0.031). The proportion of subjects whose Mn intake was the AI or less was 82%, and the proportions of subjects whose Fe, Zn, and Cu intakes were the estimated average requirements (EARs) or less were 72, 83, and 13%, respectively. Many Japanese children are deficient in Fe and Zn compared with the dietary reference intakes (DRIs). However, data in a balance study examining intakes and excretion of trace minerals are insufficient in children and DRIs for trace elements may change in future.
    Full-text · Article · Dec 2008 · Journal of Nutritional Science and Vitaminology
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    ABSTRACT: The present study aimed to evaluate in preschool children the intakes of Ca, Mg that possibly affect health and tooth formation and the intakes of K and Na that may affect lifestyle-related diseases. Information on dietary intake was collected from 90 preschool children (15 boys and 15 girls each in the 3-, 4- and 5-year old groups) on 3 separate days in the school fiscal year 1999 (April 1999 to March 2000) by the duplicate-diet technique. The Ca, Mg, K, and Na concentrations were determined by atomic absorption spectrometry using wet-ashed samples. The medians of mean daily intakes of Ca, Mg, K and Na in 3- to 5-year-old children were 432 mg, 110 mg, 1.18 g and 1.60 g, respectively, and no significant differences with regard to gender were observed. Seasonal varia-tion of intake was seen for each mineral. Calcium intake in most preschool children did not meet adequate intake (AI), probably due to low intakes of milk and dairy products in Japan. Magnesium intake was below the estimated average requirement (EAR) in 13.3% of the subjects, while the K intake met the AI. Sodium intake in a quarter of preschool children exceeded the tentative dietary goal. We concluded that in Japanese children aged 3-5 years; Ca intake is low, Na intake is high, and K intake is adequate, but some children could be at risk for Mg deficiency.
    Preview · Article · Feb 2008 · Asia Pacific Journal of Clinical Nutrition
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    ABSTRACT: The objective of this study was to assess which factors affected the maintenance of more than 20 teeth in Japanese patients aged 80 years and older, using a life-course perspective. The oral examination was carried out by dentists. The questionnaire asked about family background, background during various stages of growing up, tooth brushing, snacking, job history, health examination, war experience, number of children, oral health condition and dietary preferences. Some of the questions asked about conditions when they were a primary school student, 20 years old, 40 years old and 60 years old. Multivariable logistic-regression analysis was used to adjust for sex at significant life stages. The group with mothers who did not prefer sweet food had an approximately four times greater chance of having >or=20 teeth compared with the group with mothers who preferred sweet food. Those participants who did not prefer sweet food themselves were approximately three to five times more likely to be in the >or=20 tooth group compared with those who preferred sweet food at all stages of their life course. Non-smokers and those who quit smoking were three times more likely to be in the >or=20 tooth group than those who smoked throughout the years from 20 to 60 years of age. Factors associated with the maintenance of a sufficient number of functioning teeth were: not having a mother with a preference for sweet food, not having a preference for sweet food themselves and not smoking over a long period.
    No preview · Article · Apr 2007 · Gerodontology
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    ABSTRACT: The objective of this study was to assess whether elderly people with 20 or more natural teeth were more likely to live longer than a cohort with less than 20 teeth. Groups of elderly people over 80 years of age (24 males and 35 females) with 20 or more teeth (>or=20 group) were compared with elderly people (24 males and 35 females) with less than 20 teeth (<20 group). Follow-up studies were conducted at regular intervals for 10 years from July 1992 to July 2002. The cumulative survival rate of the >or=20 group (average +/- SE tooth number of teeth - males, 23.9 +/- 0.6; females, 23.8 +/- 0.4) was compared with the <20 group (average number of teeth - males, 3.8 +/- 1.1; females, 2.6 +/- 0.8). The multivariate Cox proportional hazard models with the number of teeth in a group (>or=20 group or <20 group). Smoking status and alcohol intake as covariates were used to adjust the cumulative survival rate. The male participants in the >or=20 group had a significantly higher cumulative survival rates (p < 0.05) than the <20 group at 18 and 21 months from baseline. There were no significant differences in survival rates between the female groups. Adjusted cumulative survival rate was significantly different at 72, 75 and 78 months between the >or=20 group and <20 group for males but not for females. Having 20 or more natural teeth was associated with increased survival rate in elderly males, but not among the elderly females.
    No preview · Article · Dec 2006 · Gerodontology
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    ABSTRACT: To evaluate the masticatory performance of elderly people at the age of 80 years. A total of 283 individuals of 80 years of age took part in a general and dental health survey. A dental examination including the number of remaining teeth, occlusion, prostheses, bite force recording, and a questionnaire regarding masticatory performance were recorded. Five municipalities (Okazaki city, Tokoname city, Tahara town, Atsumi town and Minami-chita town) in Aichi prefecture, Japan. There were 20 or more teeth in 7.4% subjects, and 44.5% were edentulous. Subjects with no occlusion accounted for 77.4% of the total. Subjects with prostheses accounted for 90.8%. Maximum bite force and masticatory ability score for patients with 20 or more teeth or not wearing prostheses were higher than other groups. The non-wearing prostheses group had a low masticatory ability score. Most of the 80-year-old individuals recovered their masticatory ability with the assistance of prostheses. Several individuals with 20 or more remaining teeth or without removable dentures present in both jaws had a high score for bite forces and masticatory abilities.
    No preview · Article · Jul 2004 · Gerodontology

  • No preview · Article · Jan 2004 · Nihon Shishubyo Gakkai Kaishi (Journal of the Japanese Society of Periodontology)
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    ABSTRACT: To bring to light the factors associated with lifestyle and oral habits which might have led to the retention of teeth in 80-year-old people, a questionnaire was sent out in 1992 inquiring about the oral and general health of all persons aged 80 years and older living in Tokoname City, near Nagoya. The total number of subjects was 1, 889 and the reply ratio was 64.5%. Seventy-eight subjects were selected at random, each of whom possesed at least 20 teeth according to their answers. A similar number of subjects, matched by sex, age, and area of residence, were selected as a control group. Each subject was interviewed to establish his or her past lifestyle and the condition of their oral health. A dentist examined the mouth of each individual at his or her house. The final number of study subjects came to 118 persons. For a statistical analysis the chi-square and Fisher's exact test were used.The results were as follows:1) The molars were lost with the greatest frequency and the canines were retained with the greatest frequency in subjects 80 years old or older.2) Most subjects who retained less than 20 teeth had false teeth and needed to repair their dentures.3) The retention of 20 or more teeth at 80 years of age or older was significantly higher in subjects not fond of sweets around 20 or 40 years of age (p<0.05), those eating only an occasional snack between meals while in primary school (p<0.05), and those whose mother was not fond of sweets (p<0.05).4) Regarding past oral condittions, the female subjects who retaining 20 or more teeth at 80 years of age or older had no swollen gums at 40 or 60 years of age (p<0.05) and had regular dentition at 20 years of age (p<0.05).
    No preview · Article · Jan 1994 · Koku Eisei Gakkai zasshi

  • No preview · Article · Jan 1988 · Koku Eisei Gakkai zasshi
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    ABSTRACT: The present study was undertaken to determine the relationship between the in vivo acid dissolution rate and the Relative Increment of Decay Index (R.I.D. Index) in school children. The dissolution rates on the upper left central incisor and the lower left first molar were determined in vivo in 1981 and in 1983. Then dental caries was examined by the same examiner every six months from the ages of 7 (1981) to 11 (1985).The R.I.D. Indices of the upper central incisors and the upper and lower first molars were calculated by comparing each examination with the base lines at 7 or 9 years of age. The results were analysed using the sum of sensitivity and specificity.The results obtained were as follows:1) The value of the mean-1/2SD was the most effective threshold for the dissolution rate of enamel.2) In general, the rate of the central incisor was insignificant, but the rate of the lower first molar was meaningful.3) The increment of dental caries is an important factor when it comes to evaluate a method such as that used to determine the dissolution rate of enamel in acid.
    No preview · Article · Jan 1988 · Koku Eisei Gakkai zasshi