• Environmental Analysis Health and Toxicology
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• 제24권2호
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• pp.149-157
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• 2009

In this study, recognized building-related health symptoms of various workers in dental college hospitals are surveyed and analyzed in order to improve indoor environment at dental college hospitals. We conducted a questionnaire survey for 682 workers in three dental college hospitals located in Seoul from Sep. 20 to Oct. 8, 2004. Most workers at dental hospitals complained about noise, poor ventilation, dusty environment, and air dryness. SBS symptoms score for subjects was 1.43${\pm}$0.74 (often feel) and major symptoms was throat, CNS, eye, and nose symptoms. Recognized Building-related health symptoms are significantly related to tasks, working experience, job-satisfaction, indoor environment recognition index, medical history, used to special material, and number of dental unit chair. Also working places and ventilation are significantly related to the symptom. Based on the results, it can be said that special dental treatment causes undesirable environment such as noise, dust, and bad odor. It is also related to recognized building related health symptoms reported by workers at dental hospitals. So managemental efforts are needed to improve indoor environment which is related by dental treatment.

• Asian Pacific Journal of Cancer Prevention
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• 제17권8호
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• pp.3687-3696
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• 2016

Cancer registration, an important component of cancer surveillance, is essential to a unified, scientific and public health approach to cancer prevention and control. India has one of the highest cancer incidence and mortality rates in the world. A good surveillance system in the form of cancer registries is important for planning and evaluating cancer-control activities. Cancer registration in India was initiated in 1964 and expanded since 1982, through initiation of the National Cancer Registry Program (NCRP) by the Indian Council of Medical Research. NCRP currently has twenty-six population based registries and seven hospital based registries. Yet, Indian cancer registries, mostly in urban areas, cover less than 15% of the population. Other potential concerns about some Indian registries include accuracy and detail of information on cancer diagnosis, and timeliness in updating the registry databases. It is also important that necessary data collection related quality assurance measures be undertaken rigorously by the registries to ensure reliable and valid information availability. This paper reviews the current status of cancer registration in India and discusses some of the important pitfalls and issues related to cancer registration. Cancer registration in India should be complemented with a nationwide effort to foster systematic investigations of cancer patterns and trends by states, regions and sub populations and allow a continuous cycle of measurement, communication and action.

• 한국임상약학회지
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• 제19권2호
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• pp.75-80
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• 2009

The preventive effect of Salvia miltiorrhiza extracts (SM) with or without high molecular weight soluble kitosan (K) on the progress of bone loss induced by ovariectomized (OVX) was studied in rats. From light microscopic analyses in histochemistry data, trabecular bone area in OVX rats was significantly decreased compared with that in sham rats. The decrease was regulated by administration of SM and especially the combination of SM and K (SM + K) for 7 weeks. In addition, the numbers of osteoblasts and osteoclasts were regulated in SM + K-administered rats but not different from those in either SM or K-administered rats. In OVX rats, free Triiodothyronine ($T_3$) and Thyroxine ($T_4$) were similar to control, ruling out the involvement of abnormal thyroid hormone. Although serum calcium is similar among all the groups, estrogen level was higher especially in SM+K-administered rats. These results strongly suggest that SM+K are effective in preventing the development of bone loss induced by OVX in rats.

• 대한치과기공학회지
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• 제31권3호
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• pp.27-34
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• 2009

This study compared and analyzed changes to the mechanical characteristics to nonprecious metal alloy for porcelain fused to metal crowns when it's repetitively used without the addition of new alloy. Metal samples were made with the Verabond V nonprecious metal alloy. Those samples to measure tensile and yield strength were made in the standardized design(ISO 22674), those to measure bond strength in the $25mm{\times}3mm{\times}0.5mm$ format, and those to measure hardness in the $10mm{\times}10mm{\times}1mm$ format. A ceramic to measure bond strength was made at the center of the metal sample in the length of $8{\ss}{\AE}$ by using Noritaker Super Porcelain EX-3. Ten samples were prepared for one, three and five repetitions of casting each. The test results were as follows: 1. The more casting was repeated, the more significantly tensile strength dropped. 2. The more casting was repeated, the more significantly yield strength dropped. 3. Repetitive casting didn't cause significant changes to bond strength. 4. The Vickers hardness significantly fell with increasing repetitions of casting. There were no changes to bond strength observed with the increasing number of repeating casting. But tensile strength, yield strength, and Vickers hardness decreased. Those results indicate that repeated casting can affect durability and that careful attention should be paid by avoiding repetitive use or excessive increase of uses when no new alloy is added.

• 대한치과교정학회지
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• 제48권5호
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• pp.326-332
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• 2018

Objective: This study was performed to compare the perception of pain between patients treated with passive self-ligating fixed appliances and those treated with Invisalign aligners. Methods: This prospective study conducted in Saudi Arabia used an estimated sample of 64 patients from a private dental clinic. After obtaining written informed consent, the patients were divided into two groups; one group (n = 32) was treated using passive self-ligating fixed appliances and the other group (n = 32) using $Invisalign^{(R)}$ aligners. Immediately after fitting the appliances, the patients' perception of pain was evaluated through a close-ended and coded self-administrated questionnaire by using a visual analog scale (VAS). Their responses were recorded at 4 hours, 24 hours, day 3, and day 7. Mann-Whitney U-test, Kruskal-Wallis test, and Pearson's chi-square test were performed for statistical analysis. Results: A lower percentage of patients treated with Invisalign aligners reported pain than did patients treated with passive self-ligating fixed appliances, and these differences were statistically significant (p = 0.001). Similarly, the mean VAS score for the Invisalign group was significantly lower than that for the passive self-ligating fixed appliance group at different intervals during the first week of treatment. The intensity of pain with both appliances peaked at 24 hours (mean VAS score, 3.87) and was lowest (mean VAS score, 1.62) on day 7. Conclusions: During the first week of orthodontic treatment, patients treated with Invisalign aligners reported lower pain than did those treated with passive self-ligating fixed appliances.

• 구강회복응용과학지
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• 제27권4호
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• pp.449-454
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• 2011

근래에 비스포스포테이트(bisphosphonate) 투약의 부작용으로 악골괴사에 관한 보고들이 점차적으로 증가하고 있다. 최근에 보고된 유병율은 대략 0.8% - 12 % 정도이다. 하악은 상악보다 2배 정도 호발하는 것으로 보고되었고 이의 60 - 70 %는 치과진료와 연관성이 거론되었다. 임상적으로 골괴사 현상이 일어나기 전에 건강한 치주조직에 변화가 일어나는데 치유지연 점막궤양, 치아동요와 원인을 알 수 없는 연조직 감염등이 관찰되었다. 치아발거가 치과영역에서 가장 흔한 사전 처치행위로 알려져 있다. 장기적인 비스포스포네이트 투약시 세심한 예방적 치과진료가 이러한 심각한 괴사로 이어지지 않도록 하는데 절대적이다.

• Journal of Periodontal and Implant Science
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• 제43권3호
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• pp.121-129
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• 2013

Purpose: The present study has two aims; firstly, it attempts to verify the presence of oxidative stress by estimating the reactive oxygen species (ROS) levels in periodontal pockets ${\geq}5$ mm as compared to controls. The second aim is to evaluate the effect of lycopene as a locally delivered antioxidant gel on periodontal health and on the gingival crevicular fluid (GCF) levels of 8-hydroxydeoxyguanosine (8-OHdG), a marker of oxidative injury. Methods: Thirty-one subjects participated in this study. In the pretreatment phase, the ROS levels in pockets ${\geq}5$ mm were measured by flow cytometry. Three sites in each subject were randomly assigned into each of the following experimental groups: sham group, only scaling and root planing (SRP) was done; placebo group, local delivery of placebo gel after SRP; and lycopene group, local delivery of lycopene gel after SRP. Clinical parameters included recording site-specific measures of GCF 8-OHdG, plaque, gingivitis, probing depth, and clinical attachment level. Results: The gel, when delivered to the sites with oxidative stress, was effective in increasing clinical attachment and in reducing gingival inflammation, probing depth, and 8-OHdG levels as compared to the placebo and sham sites. Conclusions: From this trial conducted over a period of 6 months, it was found that locally delivered lycopene seems to be effective in reducing the measures of oxidative stress and periodontal disease.

• 한국치위생학회지
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• 제15권4호
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• pp.695-703
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• 2015

Objectives: The purpose of the study is to investigate the relationship between dental fear and subjective oral health-related quality of life. Methods: A self-reported questionnaire was filled out by 320 subjects in Seoul and Gyeonggido from June to August, 2014 after permission from Institutional Review Board (IRB). Except incomplete 9 copies, 311 data were analyzed using SPSS WIN 19.0 program. The questionnaire consisted of five questions of the general characteristics of the subjects, twelve questions of oral health related quality of life, eighteen questions of dental fear, and one question of awareness toward subjective health status. Results: The explanation power of subjective oral health-related quality of life on dental fear was 26.2 percent. As the subjective oral health-related quality of life increased by 1 point, the dental fear decreased at the rate of 0.645 (p<0.001). Conclusions: Higher subjective oral health-related quality of life will diminish the dental fear. Regular dental checkups and preventive treatment are very important to enhance the oral health-related quality of life in those who visit the dental clinic.

• 대한치과기공학회지
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• 제24권1호
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• pp.83-93
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• 2002

This study was performed to evaluate the importance of parents, knowledge, cognition and behaviour about dental health care on the development of dental caries in preschoolers. Subjects were comprised of 170 preschoolers collected from three preschoolers placed in Pusan and Kimhae area and study period were 6 months from January, 2000. Examination on the preschoolers' dental health and questionnarie survey on parents' knowledge, cognition and behaviour about dental health care were conducted. Collected data were analyzed by chi-square test and t-test using SAS program. Dental caries was so prevalent as the rate of 73.5%. And, the rate was different by the area(p=0.001), and increased with preschooler's age(P=0.004). The parents gain the knowledge about dental health care mainly from dentist or dental hygienist(32.9%), newspaper, magazine booklets(26.5%), TV and VTR tape(20.0%), etc, but rarely from school health education(4.7%). Caries prevalence was significantly lower in case of regular brushing than that of insufficient brushing(p=0.002) and in case of consistently informing brushing time to their children(p=0.014). This results showed that the dental health care for preschoolers is insufficient and the most important factor for caries prevention is regular brushing. And it seemed that the parent's concern and knowledge play an important role for the prevention of preschooler's dental caries. Dental health education would be focused on the parents, especially for the practice of preventive behavior by preschoolers themselves.

• Journal of Periodontal and Implant Science
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• 제48권5호
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• pp.274-283
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• 2018

Purpose: Numerous indices have been proposed to analyse wound healing in oral soft tissues, but each has specific shortcomings. A new method of analysis, the Early Wound Healing Score (EHS), was evaluated in the present study. The aim was to assess more accurately early healing by primary intention of surgical incisions in periodontal soft tissues. Methods: Twenty-one patients were treated with different surgical procedures comprising 1 or 2 vertical releasing incisions as part of a surgical access flap. Twenty-four hours after surgery, early wound healing at the vertical releasing incisions was assessed using the EHS. This score assessed clinical signs of re-epithelialization (CSR), clinical signs of haemostasis (CSH), and clinical signs of inflammation (CSI). Since complete wound epithelialization was the main outcome, the CSR score was weighted to be 60% of the total final score. Accordingly, a score of 0, 3, or 6 points was possible for the assessment of CSR, whereas scores of 0, 1, or 2 points were possible for CSH and CSI. Higher values indicated better healing. Accordingly, the score for ideal early wound healing was 10. Results: Thirty vertical releasing incisions were assessed in 21 patients. At 24 hours after incision, 16 vertical releasing incisions (53.33%) received the maximum score of CSR, while 6 cases (20%) received an EHS of 10. None of the cases received 0 points. Conclusion: The EHS system may be a useful tool for assessing early wound healing in periodontal soft tissue by primary intention after surgery.