Biomedical subjects

Kayoko Moriya

Publications and source records attributed to Kayoko Moriya.

4 recordsLinked to original sources

PubMed2004

Surface analysis of dentinal caries in primary teeth using a pH-imaging microscope.

The aim of this in vitro study was to evaluate the pH value of intact and carious dentin in primary teeth using a pH-imaging microscope (SCHEM-100, HORIBA Ltd., Kyoto, Japan). Bucco-lingual cut sections of extracted human primary teeth, which had either mild or severe dentinal caries lesions, were placed on the pH-imaging sensor of the microscope. The pH values were compared statistically by Levene's test for equality of variances and Tukey HSD multiple comparison test (p < 0.05). For both mild and severe lesions in primary dentin, the lowest pH values in the carious lesions were lower than those of intact dentin (6.6, range 6.3-6.9). There were statistical differences between the lowest pH value within the mild lesions (6.2, range 5.8-6.4) and that of the severe lesions (6.0, range 5.9-6.2) (p < 0.05). It was concluded that SCHEM-100 was able to distinguish the pH-value distribution of intact and carious dentin in primary teeth.

Analysis of Variance↗

PubMed2003

Clinical application of Er:YAG laser for cavity preparation in children.

OBJECTIVE: The purpose of this study was to determine the clinical usefulness of Er:YAG laser for cavity preparation in children. BACKGROUND DATA: The conventional methods for cavity preparation instill fear and discomfort in pediatric patients. The Er:YAG laser is a new tool developed for cavity preparation; however, there are few reports of its clinical application. MATERIALS AND METHODS: A clinical evaluation using an Er:YAG laser was carried out using 32 subjects (with 16 deciduous and 19 permanent teeth) with ages ranging from 2 to 12 years. All cavities were restored with light-cured composite resin following the application of bonding agent, but without acid etching or primer conditioning. RESULTS: During laser treatment, the pediatric patients were very cooperative and hardly complained of any pain, and no tooth showed undesirable effects during the 3-year period of observation. CONCLUSION: It can be concluded from the results of this study that an Er:YAG laser would be a useful alternative method for cavity preparation for composite resin restoration in children.

Acrylic Resins↗

PubMed2003

Prevention of dental caries in partially erupted permanent teeth with a CO2 laser.

OBJECTIVE: The purpose of this study was to determine the effect of CO2 laser irradiation in the prevention of pit and fissure caries in immature molars with covering opercula. BACKGROUND DATA: In pediatric dentistry, it is not unusual to find partially erupted immature permanent teeth, especially with opercula. Conventional dental caries prevention is not effective in these cases because of the immaturity of tooth substance and the presence of the opercula, which accumulate a substantial amount of plaque. MATERIALS AND METHODS: The CO2 laser was used on 22 immature erupting molars with opercula. In each case, we first cut the operculum with a CO2 laser in a 2- or 3-watt continuous mode. Then, the occlusal surface was irradiated spot by spot along the pits and fissures of the molar using a CO2 laser in a 2-watt pulsed mode with 0.2 sec of irradiation time (average power, 0.3 watt; pulse width, 10 msec; repetition time, 15 Hz; energy density, 15 J/cm2). Each of the studied teeth was clinically examined for dental caries for 3 years. RESULTS: It took less than 2 min to cut the operculum, and there was no bleeding. The irradiation imparted acid resistance to the teeth without any discomfort to the patients. The patients did not complain of any pain after the procedure. Only two of the studied teeth developed dental caries during the observation period. CONCLUSION: We conclude that a CO2 laser might be an effective mode of treatment in the prevention of pit and fissure caries in partially erupted permanent molars covered with opercula.

Carbon Dioxide↗

PubMed2002

[Application of a CO₂ laser for oral soft tissue surgery in children in Sri Lanka--introduction of a laser through activities of aid to a developing country].

The objective of this study was to clarify the effect of CO2 laser irradiation on oral tissue problems in children in Sri Lanka, through the activities of aid to a developing country by the Japan International Cooperation Agency. This study took about six months, during two times periods: from November 2000 to February 2001, and from July 2001 to October 2001, in the paedodontic clinic of the Faculty of Dental Science, University of Peradeniya, in Sri Lanka. A CO2 laser was used on 48 subjects (51 cases), aged between 1 and 15 years, having main indications for labial frenectomy, frenectomy in ankyloglossia, and excision of mucocele. The results indicated that the CO2 laser had the following advantages. 1. Soft tissue cutting was efficient, with no bleeding, giving a clear operative field during operation. 2. There was no need to use sutures. 3. The surgery itself was simple and less time-consuming. Hence, there was no need for general anesthesia for such cases as tongue tie operation in small children. 4. There was no postsurgical infection. As a result, there was no need for analgesics or antibiotics, as post-surgical pain and infection were prevented. 5. Wound contraction and scarring were decreased or eliminated. Considering the above advantages, the use of a CO2 laser proved to be very safe and effective for soft tissue surgery, especially for children in developing countries such as Sri Lanka.

Adolescent↗