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2013, Vol.13, No.2

  • 1.

    A study on stress factors in dental hygienists caused by students in clinical practice by pattern of hospital

    Jang Sung Yeon | KWON SOON BOK | 양승경 | 2013, 13(2) | pp.181~191 | number of Cited : 4
    Abstract PDF
    Objectives : The research was performed to be used as basic data for dental hygienists' job satisfaction during clinical practice, and planning and operating effective clinical practice by analyzing stress factors in dental hygienists and the extent of stress caused by students in clinical practice. Methods : The research was aimed at dental hygienists working at college dental hospitals, dental clinic of general hospitals, dental hospitals and dental clinics located in Seoul and Gyeonggi province where clinical practices were conducted for dental hygiene students. For analysis, collected data was analyzed by using SPSS 20.0. Results : Results derived from analysis on characteristic difference by pattern of hospital were observed that there was a significant difference in job satisfaction by pattern of hospital. Results from analysis on correlation among stress factors were observed that there was correlation between behavior and attitude,interpersonal relationships, role and activity, ideal and value, and treatment fields. Results derived from analysis on the effect of stress factors on the job satisfaction were observed that role and activity (p=.002<.01), ideal and value (p=.019<.05),and treatment fields (p=.032<.05) affected the job satisfaction, while behavior and attitude (p=.386>.05), and interpersonal relationships ((p=.421>.05) did not affect the job satisfaction. A stress factor, role and activity (β =.350) affected the job satisfaction the most, followed by ideal and value (β=.242), and treatment fields (β=-.185). For the explanation ability, the stress factors accounted for 20.5% of the job satisfaction. Conclusions : In conclusion, most of the dental hygienists are satisfied with students' clinical practice by pattern of hospital. Positive correlation was shown between stress factors. Behavior and attitude and ideal and value are high in stress in college dental hospitals, role and activity and treatment fields are high in stress in dental hospital, and interpersonal relationships are high in stress in dental clinics.
  • 2.

    Influential factors related to hand washing practice of dental hygienists by health belief model

    Lim Mi Hee | 2013, 13(2) | pp.193~200 | number of Cited : 10
    Abstract PDF
    Objectives : The purpose of this study was to examine influential factors related to hand washing practice in dental hygienists by health belief model, one of the major predictors of health behavior including perceived susceptibility, perceived seriousness, perceived benefits, perceived barriers and cues to action. Methods : The subjects were dental hygienists in dental hospitals, dental clinics,general hospitals and university hospitals in Seoul. A survey was conducted from May 1 to September 30, 2011. Results : Analysis of health belief of dental hygienists in hand washing, they revealed the highest marks of 4.39 to perceived benefits, followed by perceived susceptibility(4.29), perceived seriousness(3.94), cues to action(3.30) and perceived barriers(1.81). The mean was 4.13 in hand washing practice. The senior and well educated dental hygienists in general hospitals had a tendency to wash hands frequently. It is statistically significant(p<0.05). In regard to the correlation among the subfactors of health beliefs, susceptibility had a statistically significant positive correlation to seriousness, benefits and cues to action, and seriousness was positively correlated to benefits and cues to action. Conclusions : It is necessary to develop and implement hand washing education program for dental hygienists focusing on perceived benefits and barriers which are two of the health beliefs affecting the hand washing practice.
  • 3.

    A study on the improvement of the national dental hygienist practical examination

    Nam.y.o | On-Ju Ju | 김민자 | 2013, 13(2) | pp.201~209 | number of Cited : 6
    Abstract PDF
    Objectives : The purpose of this study was to examine the problems with the current practical examination, to suggest some of the right directions for that and to facilitate the improvement of the exam. Methods : The subjects in this study were the selected professors involving professors in charge of practice and the selected clinical dental hygienists who had ever served as the graders of the national practical exam. Results : A direct practical test was required in the national practical exam (77.3%), and educational facilities(79.2%)(p<0.05). They didn't put confidence in the national practical exam(81.0%) nor viewed the items about the removal and detection of dental calculus as appropriate(58.5%), either. Specifically, the items were considered to be more inappropriate by the professors in charge of practice(74.3%) than by the other professors and clinical dental hygienists(p<0.05). Concerning ways of administering the national exam, the largest group preferred that a professional evaluator should evaluate students in person by visiting their colleges(66.8%). Conclusions : The above-mentioned findings illustrated that both of the dental hygiene professors and the clinical dental hygienists thought the current national dental hygienist practical exam would absolutely be necessary since it exerted a great influence on education and educational facilities, and that the national exam should be improved to gain more confidence, to solve comprehensive problems and to ensure the efficiency of administration.
  • 4.

    A study on illegal dental treatment

    Kim, Hyeong-Su | Kim Vit Na | 2013, 13(2) | pp.211~220 | number of Cited : 1
    Abstract PDF
    Objectives : This study intended to figure out illegal treatment by unlicensed person in dental area and factors, which were considered as user's position on the basis of the local community investigation of health conditions in chungbuk provinces in 2008. Methods : This study used chi-square test and complex sample design of multi-variate logistic regression analysis to question 12,443 peoples who have experience on illegal dental treatment. Results : Multi-variate logistic regression analysis results showed that factors having related to illegal dental treatment are sex, age, education standards,subjective awareness of oral health condition, drinking experience of lifetime,unmet need of dental treatment, chewing difficulty, use of dentures, experience of scaling and the use of interdental care instrument. Conclusions : As a result of this study, in order to root out illegal dental treatment,we need to expand the breadth of health insurance coverage so that it can reduce the burden of dental expenses. Moreover, we need to set out health service of public oral health to inform the importances of maintaining good oral health and the problems of illegal dental treatment by unlicensed person.
  • 5.

    Associated factors which influence satisfaction of dental implant patients and intention to revisit using structural equation model

    조민숙 | 유성진 | donghyun-yang | 2013, 13(2) | pp.221~230 | number of Cited : 1
    Abstract PDF
    Objectives : This study is to confirm the influencing factors on patients satisfaction and intention to revisit the implant service clinic by structural equation model. Methods : We surveyed 250 implant patients visiting 6 dental clnics(hospitals)in Busan, Changwon, Gimhae city and questionnaire was for four weeks in July 2012, a total 209 patients filled out the questionnaires within July and the complete data were analyzed. we were used structural equation model for analysis to confirm influencing factors on implant patients' satisfaction and intention to revisits. Results : This study finds that factors influencing on implant patients' satisfaction and intention to revisit are reasonable medical fee, medical skill treatment of dentist, dental hygienist and other support staff, administrative procedure, and there existed between influencing factors and the patient's treatment satisfaction as well as intention to revisit. In order to satisfy the implant patients, dentist and hygienists should try to provide high quality of treatment and dental services. Conclusions : The results of this study provide managerially important messages to the managers of dental clinics in order to develope management strategies for new customers.
  • 6.

    A study on factors relevant to the self-perception of halitosis and the correlation between halitosis and obsessive-compulsive disorders

    Lee Mi Ra | Kim,Nam-Song | 심재숙 | 2013, 13(2) | pp.231~237 | number of Cited : 2
    Abstract PDF
    Objectives : The purpose of this study to provide preliminary data to effective halitosis control. Methods : A survey was carried out the self-perception of causative factors of halitosis in 98 female college students in Chungnam province. In addition,the levels of oral gas and breath gas were measured by use of the B&B checker,and an analysis was made of the correlation between halitosis and obsessive-compulsive disorder (OCD). Results : 1. Subjective halitosis awareness degree different degree of dryness,'None', 'some', 'little' people who feel as the 'little fly' (68%), 78.3%, 70% was higher (p<0.05), halitosis interest 'very worried', 'worry', 'normal' person with a' not at all 'to 58.3% higher (p<0.01). 2. In regard to OCD severity, 49.0%, 34.7%and 16.3% were found to be mild, moderate and severe respectively. Halitosis tended to be severe in proportion to OCD severity, which was statistically significant (p<0.05). 3. Oral gas had a positively correlation with breath gas (r=0.329, p<0.01), but had a negative one with OCD severity (r=0.204, p<0.05). Conclusions : Symptoms of oral dryness and halitosis interest were associated with self-perception of halitosis. The levels of oral gas and breath gas were in inverse proportion to OCD severity. Hereat, it needs to analyze psychogenic factors properly as regards the diagnosis or treatment of halitosis.
  • 7.

    A study on some workers' effective oral health behavior and workplace oral examination

    kim young im | 2013, 13(2) | pp.239~247 | number of Cited : 8
    Abstract PDF
    Objectives : The direction for qualitative improvement of our country's workers'by arranging data necessary for improving oral health program and system aiming to promote workers' oral health in the future is suggested in this study. Methods : The questionnaire by self-administrated method, which was selected by convenience sampling method, was carried out from October 4th to December 31th, 2011 targeting 424 workers from 6 working places in Jellabuk-do Province. Results : 1. It was indicated that workers' interest in oral health is higher than moderate and that workers are perceiving oral health as one of critical problems and thinking that the level of their oral health knowledge is low and oral health status is under moderate. 2. It was indicated that the rate of workplace oral screening is high, but the dissatisfaction ratio with workplace oral examination is high. Non-screening of medical treatment was indicated to be the highest after oral examination. 3. Factors of having influence upon the workplace oral examination included age, marital status, appearance, educational level, work-life term, and average monthly household income. Conclusions : It is judged to be likely important to make them have positive attitude toward oral health care through the accurate publicity of workplace oral examination and education on prevention of oral disease by reflecting workers'high interest in oral health.
  • 8.

    A survey of cognition on infection control of the clients in dental hospital

    Lee Jung Hwa | 2013, 13(2) | pp.249~260 | number of Cited : 7
    Abstract PDF
    Objectives : To figure out the status of infection control (IC) in dental healthcare field and to propose the way for improvements through assessment about cognition of the clients. Methods : Study subjects were 151 patients who visited H dental health organization (DHO) of the four DHO in Busan city. The questionnaire survey performed from November 10 to December 7, 2010. Results : 1. 43.0% of consumers were interested in perception and experience in the infection control, and 38.4% were related behavioral changes in the infection control. 2. In the clients survey, the major considerations about the performance for IC were hand washing(73.5%). 3. There was significantly higher in middle-aged to think for ages infection prevention behaviors recognized as important to wear safety glasses. 4. In the confidence for dental care organization according to gender and age, appearance and outfits of staffs was the highest major consideration items. Conclusions : Infection control closely related to the clients' satisfaction and credits, therefor changing of interest, cognition and attitude for the client's IC have to be emphasized.
  • 9.

    PHP index according to toothbrushing behavior and smoke status of some local residents1

    Yoon Sung Uk | Wonho Yang | 2013, 13(2) | pp.261~269 | number of Cited : 7
    Abstract PDF
    Objectives : This research examined the Patient Hygiene Performance(PHP) index according to smoking and tooth brushing behavior, in order to analyze how they influence the oral hygiene. Methods : This research used PHP index and the structured questionnaire. The subjects were 203 men in their 20’s who visited K university’s dental hygiene department for oral prophylaxis from March to July of 2012. For data analysis SPSS WIN 12.0 was used. Results : 1. The average PHP index of all experimented subjects was 2.66, a very poor level. The PHP index according to general characteristics, smoking,drinking, and exercise showed statistical significance(p<0.05). 2. PHP index decreased with more frequencies and longer durations of toothbrushing(p<0.05). 3. The PHP index of smokers is higher than that of non-smokers. In the case of non-smokers, the frequency, method, and duration of tooth brushing had a statistical significance(p<0.05). 4. The PHP index of smokers who smoke less than or equal to ten cigarettes is 2.53 and smokers who smoked more than 10cigarettes is 3.10. 5. The results of multiple regression analysis showed that smoking increased the PHP index, while the increase in tooth brushing frequency and the up and down tooth brushing method decreased the PHP index. All the coefficients were statistically significant (p<0.05). Conclusions : In order to increase Patient Hygiene Performance(PHP) index. there must be a decrease in smoking rate while people increase their tooth brushing frequency and use a proper tooth brushing method.
  • 10.

    The effects of incremental dental care(IDC) on kindergarten children

    Ha,Myung-Ok | 조민정 | 김은미 | 2013, 13(2) | pp.271~277 | number of Cited : 12
    Abstract PDF
    Objectives : The purpose of this study was to evaluate the effects of incremental dental care(IDC) program on kindergarten children. Methods : The subjects were 46 kindergarten children aged 6 who wished participation in IDC program during 5 weeks at oral health center in G-college from March to May, 2012. The data of subjects were examined into oral conditions such as toothbrushing method and frequency, modified O'leary plaque index and dental caries activity before and after IDC program. The collected data were analyzed by SPSS statistical package version 19.0. Results : 1. The rolling and fones methods of toothbrushing increased from 10.8%to 91.3% after IDC program(p<.001). The change of toothbrushing frequency showed that over 3 times a day increased from 52.2% to 76.0% after IDC program(p<.01). 2. The modified O'leary plaque index of before toothbrushing education increased from 1st visit(score 32.19) to 5th visit(score 57.14) and after toothbrushing education increased from 1st visit(score 64.45) to 5th visit(score 78.27) during IDC program(p<.001). 3. As a results of dental caries activity test before and after IDC program, it was found that the bacterial numbers in S.mutans and Latobacillus reduced from 0.74, 0.70 to 0.28, 0.41 (p<.01) and the saliva buffering capacity increased from 1.50 to 2.02(p<.001). Conclusions : It is considered very necessary that IDC program should be maintained and extended to dental clinic so as to enhance the oral health state of kindergarten children.
  • 11.

    The factors affecting oral health behavior of elementary-school students in Gyeonggi province

    SOMIHYUN | Yeonhee Kim | 2013, 13(2) | pp.279~286 | number of Cited : 4
    Abstract PDF
    Objectives : The purpose of this study is to provide resources to develop oral health education programs to make schoolchildren be able to do oral care behaviors voluntarily by analyzing the factors affecting elementary school students's oral health behaviors. Methods : A self administered questionnaire based survey was conducted with 233 students (117 boys, 116 girls) of sixth graders at Gyeonggi Province from September 1st to October 2nd, 2012. Researchers explained to willing participants the purpose of this study and then, asked respondents to complete their own questionnaire. A total of 233 questionnaires were properly completed while 7questionnaires had insincere sections and were thus excepted. Results : 1. Children's higher level of oral health-related knowledge have more positive oral health attitudes(p=0.000) and oral health behaviors(p=0.001). 2. The higher oral health behavior mothers have, the more students have oral health knowledge and better oral health attitude, the higher the oral health behavior children have(p<0.01). 3. Students' positive attitude towards oral health(β=0.548,p=0.000) and Mother's more attention to Oral check after tooth-brushing(β=-0.149, p=0.005) were associated with children's sound dental health behaviors. Conclusions : The findings of this study suggest that the oral health knowledge,attitude and behaviors are associated with students' oral health behavior. Thus,effective support in oral health education, is need to be enhanced among the elementary school students rather than only focus on conveying knowledge to them. Since, mother's oral health-related knowledge and attitudes on the tooth-brushing behaviour and dental health of their children influence on child's oral health, the development of Comprehensive oral health education program into the mother and child needs to be carried out.
  • 12.

    Factors influencing oral health behaviors in high school students

    Jang Kyeung Ae | 2013, 13(2) | pp.287~295 | number of Cited : 1
    Abstract PDF
    Objectives : This study was to infectify variable the factors influencing oral health behaviors in high school students. Methods : Data were collected from 241 high school students Busan and Kyungnam Province for four weeks in July 2012. The SPSS 18.0 program was used for data analysis, which included t-test, correlation analysis, multiple logistic regression analysis. Results : Positive correlation in the order of social support(r=.381), selfefficiency(r=.309) with perceived benefit of oral health behavior and social support with total heal index(r=.298) are shown. In the contrary, the relation between social support(r=-.400), subjective oral health status(r=-.222) with impairments of oral health behavior have negative one. Experience in three or more tooth brushing has an effect on social support and subjective oral health status(p<.05). Perceived benefit(p<.001) of oral health life and subjective oral health status(p<.05)are affected by recognition of correct tooth brushing. Intake of harmful food on tooth has an effects on perceived benefit, self-efficiency, total health index and subjective oral health status(p<.05). Conclusions : In conclusion, systematic activation of oral health education in school and correct self-activity of oral health will promote oral health of youth.
  • 13.

    Evaluation of oral health service program for disabled persons in Ulsan, Korea

    Min-Ji Kim | 전은주 | Dong-Hun Han and 2other persons | 2013, 13(2) | pp.297~303 | number of Cited : 2
    Abstract PDF
    Objectives : The purpose of this study was to evaluate the oral health status of the disabled people in Ulsan. Methods : Two dentists taken a calibration training for national oral health survey examined the Oral health status on 110 disabled people in Ulsan, in 2009. The surveyed disabled people, 6 to 19 years old, have been supplied with the oral health care services by dentists, oral hygienists and volunteers at dental clinics of schools and a dental clinic supported from Ulsan Metropolitan City Nam-Gu Health Center since 1997. The obtained data from these surveys were analyzed with the SPSS statistical package. Results : Among subjects aged 12-14 years, DMF rate was 38.2%; Active D rate,17.6%; DMFT index, 1.15; DT rate, 33.33%; MT rate, 0.00%; FT rate, 66.67%. Oral heath status of disabled people in Ulsan were evaluated to be a similar level to the Ulsan non-disabled citizens from 2010 Korean National Survey. Conclusions : The oral health care programs for disabled people using voluntary dentists, oral hygienists and other workers in Ulsan are evaluated to be effective for the disabled people.
  • 14.

    Oral health–related quality of life according to oral health behavior and awareness of middle school students in some regions

    박정희 | LEE MYEONG JU | Goo Hyo Jin | 2013, 13(2) | pp.305~313 | number of Cited : 8
    Abstract PDF
    Objectives : This study has attempted to investigate subjective oral health awareness, oral health behavior and analyze how the results are correlated with oral health-related quality of life against middle school students. Methods : A self-administered questionnaire survey was performed against 552students from three middle schools in Changwon. A frequent analysis was conducted on research subjects’ general characteristics, oral health awareness,oral health behavior. In addition, t-test and ANOVA were carried out to analyze oral health-related quality of life by the general characteristics, oral health awareness and oral health behavior. Results : In terms of oral health-related quality of life by general characteristics,the quality of life on oral symptoms was higher at lower school grades (p〈0.05). In terms of social welfare, oral health-related quality of life was higher as parents’ monthly income increased (p〈0.05). Oral health-related quality of life was high in oral symptoms when there was no interest in oral health, in functional limitation, emotional welfare and social welfare when there is some oral health-related knowledge (p〈0.05) and in all sub categories when oral conditions are healthy (p〈0.05). Conclusions : The results of this study has come up with important information for improvement of oral health-related quality of life in middle school students by investigating the correlations between oral health awareness and oral health-related quality of life.
  • 15.

    A study on the relationship between perceived family support and satisfaction of clinical practice by dental hygiene students

    Choi, Jeonghee | 고은경 | Lee, Sunglim | 2013, 13(2) | pp.315~322 | number of Cited : 3
    Abstract PDF
    Objectives : The purpose of this study was to investigate the relationship between the degree of family support and the degree of satisfaction in clinical practice by dental hygiene students. Methods : In this study, convenience sampling was conducted in 272 dental hygiene students from 3 dental hygiene colleges in South Jeolla Province, from October 4 through 15, 2010. A survey was conducted by using structured questionnaires. The data was analyzed by t-test, a one way ANOVA, and Pearson correlation coefficient. Results : Family support according to general characteristics showed a significant difference by economic status(p<0.001), satisfaction of major(p<0.01), and interpersonal relationship(p<0.05). Satisfaction degree on clinical practice according to general characteristics showed a significant difference by satisfaction of major(p<0.05) and interpersonal relationship(p<0.05). The relationship between generally perceived family support correlated with the degree of satisfaction in clinical practice(r=.154, p<0.05). Conclusions : It was found that a higher degree of satisfaction in clinical practice depends on a higher degree of family support. Therefore it is required to program development to improve satisfaction level of clinical practice by family support.
  • 16.

    Development proposal of oral health educational media based on the oral health care and educational needs of college students

    임지나 | Jung Young Ran | 2013, 13(2) | pp.323~334 | number of Cited : 21
    Abstract PDF
    Objectives : The purpose of this study was to examine the oral health care and educational needs of college students in an effort to give some suggestions on the development of oral health educational media. It's basically meant to boost the efficiency of oral health education geared toward college students. Methods : The subjects in this study were 500 students at seven different colleges located in Daejeon and South Choongcheong Province. After a survey was conducted,frequency analysis and ANOVA were utilized to analyze the collected data. And the records of the in-depth interviews of 10 students were analyzed as well. Results : The gender of the students and whether their major was linked to health or not made differences to their knowledge of dental caries. And there was nothing to affect their knowledge of periodontal diseases except whether their major was related to health or not. They didn't have a good knowledge of periodontal diseases,and they just regarded toothbrushing as a means to prevent dental caries and periodontal diseases. They preferred to acquire knowledge over the Internet. Conclusions : College students who don't know well about periodontal diseases should be given an opportunity to learn about periodontal diseases and diverse ways of preventing dental caries and periodontal diseases other than toothbrushing. As the college students preferred to surf the Internet, educational programs should be developed in the form of video clips that can be found over the Internet, and more aggressive publicity is required via SNS, etc
  • 17.

    A study on motivation for major choice and major adaptation among some dental hygiene students

    Jang Gye Won | Lee Ji Young | Jung | 2013, 13(2) | pp.335~342 | number of Cited : 8
    Abstract PDF
    Objectives : The purpose of this study was to examine the satisfaction level of students with a job tour program and their major and their adaptation to their major in an effort to provide some information on student guidance and the improvement of dental hygiene education. Methods : The subjects in this study were 269 freshmen to find out their views of job tour and the relationship of their general characteristics and motivation of major choice to satisfaction level with their major and adaptation to the department, t-test and one-way ANOVA were carried out. And correlation analysis was made to look for connections among major satisfaction, major adaptation and satisfaction with job tour. Results : 1. As for the choice of major, the biggest group of 128 students (47.6%)made a decision on their own. 2. In regard to satisfaction level with their major,the freshmen got 3.55±0.67, and the sophomores got 3.36±0.66. There was a significant difference according to academic year(p<0.05). 3. Concerning the links between motivation for major choice and major satisfaction, the students who chose their major in consideration of their own aptitude or personality got the highest marks of 3.96±0.64(p<0.05). 4. As to satisfaction level with the job tour program, they were most satisfied with field trip(4.03±0.74). 5. Regarding the correlation among major satisfaction, major adaptation and satisfaction with the job tour program, there was a significant correlation among all the variables(p<0.01). Conclusions : The students who gave priority to their own aptitude and personality in choosing their major were more satisfied with their major and were better adapted to that. Therefore it's required to consider how to boost the satisfaction level of students with their major and their adaptation to that.
  • 18.

    Kolb learning styles and self-regulated learning strategies of dental hygiene students

    Mi-Jeong Kim | LIM CHA YOUNG | 2013, 13(2) | pp.343~350 | number of Cited : 5
    Abstract PDF
    Objectives : The objective of this study is to analyze about learning styles and self-regulated learning strategies of dental hygiene students and to find methods that may increase learning outcomes by selecting effective learning methods. Methods : The subjects of this study are 524 dental hygiene students in region of chonbuk from May, 2012 to June, 2012. collected informations are analyzed with SPSS. Results : 1. 38.1%, assimilator is most of learning styles of dental hygiene students,followed by 29.7%, converger, 16.2%, diverger, 15.8%, accommodator. 2. 28.0%,converger and diverger are most of subjects whose grade score is between 2.0-2.9,41.50%, accommodator is most of 3.0-3.4, and 41.61% accommodator is most of 3.5-3.9, and 28.0%, converger is most of subjects whose grade score is more than 4.0. this results has statistically signification(p<0.01). 3. 8.71±1.78,assimilation strategy is most self-regulated learning strategies of dental hygiene students, followed by 8.26±1.94, control strategy, 7.52±2.00, memorization strategy. accommodator is most showed 7.82±2.24, 9.13±1.74, 8.71±2.20 in memorization strategy, assimilation strategy, control strategy. 4. It is showed that assimilator is significantly related with satisfaction for major(p<0.01),accommodator is significantly related with academic records(p<0.05), and diverger is significantly negative related with academic records, through the results of the analysis of factors that affects learning styles. Conclusions : Organizing above results, It is considered that instructor needs to acknowledge learning styles of students through understanding about various learning styles of students, and may has to develop suitable teaching method for students based on that.
  • 19.

    The effect of tooth bleaching agent contained 15% carbamide peroxide on the color, microhardness and surface roughness of tooth-colored restorative materials by using pH cycling model

    박소영 | 송민지 | 전수영 and 2other persons | 2013, 13(2) | pp.351~360 | number of Cited : 1
    Abstract PDF
    Objectives : The purpose of this study was to evaluate the effects of tooth bleaching agent contained 15% carbamide peroxide on the color, microhardness and surface roughness of tooth-colored restorative materials by using pH cycling model. Methods : Four types of tooth-colored restorative materials, including a composite resin(Filtek Z350 ; Z350), a flowable composite resin(Filtek P60 : P60), a compomer(DyractⓇ AP ; DY), and a glass-ionomer cement(KetacTM Molar Easymix ; KM). were used in the study. Eighty-eight specimens of each material were fabricated,randomly divided into two groups(n=44): experimental group(15% carbamide peroxide)and control group(distilled water). These groups were then divided into four subgroups(n=11). All groups were bleached 4 hours per day for 14 days using pH cycling model. The authors measured the color, microhardness, and roughness of the specimens before and after bleaching. The data were analyzed with ANOVA and T-test. Results : Z350 and P60 showed a slight color change(△E*), whereas DY and KM showed significantly color change(p<0.05). Among them, the greatest color change was observed in DY. Percentage microhardness loss(PML) of the distilled water group was 1.8 to 5.1%, and 15% peroxide peroxide group was 5.0 to 25.2%. Microhardness of DY and KM showed a statistically significant decrease(p<0.05). Roughness was increased in all groups after bleaching. Z350 and P60 does not have a significant difference(p>0.05), however DY and KM significantly increased more than the 0.2 ㎛(p<0.05). Conclusions : The effects of bleaching on restorative materials were material dependent. It is necessary to consider the type of the material before starting the treatment.
  • 20.

    Evaluation of fitness of metal-ceramic crown fabricated by cobalt-chrome alloy

    Kim, Jae-Hong | Kim won-Soo | 김기백 | 2013, 13(2) | pp.361~368 | number of Cited : 4
    Abstract PDF
    Objectives : The purpose of this in vitro study was to evaluate the effect of firing cycles on the marginal and internal fit of metal ceramic crown. Methods : Ten same cases of stone models (abutment teeth 11) were manufactured. Ten cobalt-chrome cores were made per each models and the marginal and internal fit was evaluated through a silicone replica technique. The marginal and internal fit of specimens was measured twice. The first measurement was done after manufacturing cobalt-chrome alloy core and the second measurement was done after porcelain firing. T-test of paired sample for statistical analysis was executed with SPSS 12.0K for Windows (α=0.05). Results : Mean(SD) marginal and internal fit were 77.1(23.3) ㎛ for the cobalt-chrome alloy core group and 84.4(21.9) ㎛ for the metal-ceramic crown group. They were statistically significant differences between groups for marginal and internal fit (p<.05). Conclusions : All metal ceramic crowns showed marginal and internal fit ranged within the current clinical recommendations.