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The purpose of this study was to verify cognition of soft drinks intake in university students and to identify correlation between the degree of enamel demineralization and soft drinks intake. The survey study for cognition of soft intake proceeded with 239 university students lived in Pusan. The effect soft drinks to enamel demineralization were investigated using soda drink, 100% orange juice, ion drink, and yoghurt. Bovine enamel specimen which 300-400 Vickers Hardness Number (VHN) were selected and immersed in each soft drink for 24 hours. The difference of micro-hardness was identified with VHN and micro-structure of enamel surface was confirmed with SEM image. University students had a tendency to choice soft drinks with their calorie and spice and hardly consider the content of calcium. In demineralization study, yoghurt group showed the most effect of demineralization (-Δ 357.9 VHN) and the minimum effect was verified in soda drink (-Δ 201.6 VHN). The micro-structure of demineralized samples was decolorized around enamel rods and the loss of their mineral component was observed in SEM images. In conclusion, yoghurt drink had the most influence on demineralization of enamel as compared with soda, orange juice, and ion drink.

In order to observe the rate of error to intraoral standard radiographic techniques, this study analyzed 560 films, and conducted a questionnaire with 20 Dong Pusan College students who have used the bisecting angle technique. Followed are the results of the student. 1. In maxillar, the rate of error was the highest for incorrect film placement and overlap. The most of error rates were identified in cuspid before clinical practice and in premolar after practice. 2. In mandible, the rate of error was the highest for incorrect film placement and elongation. The most of error rates were identified in premolar before clinical practice and in incisor after practice. 3. Clinical practices for standard radiographic techniques improved error rates from 31.5% to 17.9% in maxillar, from 26.0% to 19.3% in mandible. 4. The result of survey with students was that the error of radiography was the most in maxillary cuspid and that vertical angulation was the most difficult.

1. The track of their major made a statistically significant difference to their toothbrushing method(p＜0.01). 37.0% of the health-related majors and 14.6% of the health-unrelated majors used the rolling method, which was the right way of toothbrushing. There was a statistically significant difference between the health-related and health- unrelated majors in tongue cleaning as well(p＜0.01). 86.0% of the former and 48.5% of the latter cleaned their tongues. In addition, there was a statistically significant intergroup gap in scaling experience (p＜0.01). The rates of the health-related and healthunrelated majors who had ever had their teeth scaled respectively stood at 60.0% and 38.8%. 2. As for the question about education experience on oral health care including toothbrushing, 59.0% of the health-related majors and 39.8% of the health-unrelated majors had ever received that education, and the disparity between the two was statistically significant (p＜0.01). In regard to the necessity of oral-health education, 53.0 % of the health-related majors and 52.4% of the health-unrelated majors felt the need for that, and the intergroup gap was statistically significant(p＜0.01). 3. As a result of investigating their needs for oral-health education, 62.0% of the health-related majors found it advisable to receive oral- health education on a regular basis, and that rate of the healthrelated majors was higher than that of the health-unrelated majors who had the same opinion. The largest number of the health-unrelated majors who accounted for 51.5% asked for regular dental checkup, and the gap between the health-related and nonrelated majors was statistically significant in that regard(p＜0.01). The above-mentioned findings showed the strong needs of the college students for oral-health education, and more intensive oral-health education should be provided for college students to promote their oral health.

The purpose of this study was to examine the awareness of people in general about oral health and oral prophylaxis in an attempt to accentuate the importance of oral prophylaxis education, to improve that education and to promote national oral health. The subjects in this study were 318 people who visited the oral prophylaxis practice lab in the department of dental hygiene at this university. The findings of the study were as follows: 1. As for scaling, the largest number of the people investigated never had their teeth scaled, and just a very small group did that on a regular basis. 2. Concerning positive and negative perception about oral prophylaxis before training, the most dominant positive view was that oral prophylaxis would make the mouth clean. The least common negative perspective was that oral prophylaxis provided by the practice lab would lag behind the same service offered by dental hospitals or clinics. 3. As to oral prophylaxis symptoms and feelings after training, the greatest group felt refreshed in the mouth. 4. Regarding any possible differences in their positive views by gender, both of the men and women had a significantly better opinion after training. In terms of negative perspective, there was no statistically significant change, but they took a less negative view after training was provided.

An extended life span has made people in general pay more attention to the importance of oral health as what affects the quality of life, and that also has contributed to having their health-related financial burden and pain compounded. The purpose of this study was to assess the quality of the oral healthrelated lives of adults in an attempt to help formulate more efficient health-care policies and programs, to improve the general and oral health care of adults and ultimately to further their quality of life. The subjects in this study were adults who were under 65 across the nation in Western age. They were selected by using a table of random numbers from a KTF directory, and a self-administered survey was conducted by mail from March through June, 2006. Their answer sheets were gathered by mail, too. Dental hospitals and clinics that the selected people used were asked to provide information on their oral health status. Those who didn’t use any dental hospitals or clinics were helped by this researcher to be tested by dentists or by dental hygienists under the supervision of dentists after dental institutions that were accessible to them were selected. 1,500 questionnaires were handed out, and the answer sheets from 586 people were gathered(response rate 39%). The collected data were analyzed with SPSS/PC WIN 12.0 program. The major findings of the study were as follows: 1. As for the reliability of OHIP-49, an inventory of evaluating the quality of health-related life, Cronbach’s alpha of it ranged from 0.8 to 0.9. 2. Concerning relations between their oral health state and the quality of life related to oral health, a higher quality of life was led by those whose occlusal conditions were normal, whose dental calculus was less and who had a less number of missing teeth and prosthetic tooth. And the gap between them and the others was statistically significant. Missing teeth made a difference to the quality of life related to oral health by approximately 12 to 15 scores when the rate of missing teeth accounted for 30 percent or less. The number of prosthetic teeth made little difference to the quality of life, but the denture wearers were different from the others in the quality of life related to oral health by about 17 to 29 scores. 3. Regarding connections between the general characteristics of the subjects and their quality of life related to oral health, those who were male, who were younger, who were better educated and who had a larger monthly mean income, led a higher-quality of life in association with oral health. The above-mentioned findings lent credibility to the reliability of the Korean versions of and OHIP-49. One’s health cannot be complete without a good oral health, and the quality of life definitely hinge on oral health status. So the importance of existing teeth shouldn’t be overlooked. Intensive research efforts should be directed into providing successful health education for different group of learners to improve their quality of life, and a larger number of subjects from different backgrounds should be examined to prepare more valid instruments. Improved health education is expected to promote the health of people, to let them stay away from diseases and to help them live a better quality of life, and efficient health-care policies should be prepared to urge them to keep taking care of themselves.

This study considered correlation by oral malodor components and examined the amount and activities of oral microorganisms within dental plaque and saliva and their correlation with occurrence of oral malodor in 127 adult volunteers (74 males and 53 females) in their twenties to forties who agreed on the purport of this study among those who visited the preventive dental clinic of D University Dental Clinic from October 23, 2006 to August 30, 2007. As for correlation among oral malodor components, there was correlation between sulfureted hydrogen and methyl mercaptan, between methyl mercaptan and dimethyl sulfide, and between hydrogen sulfide and ammonia (r=0.1923, p=0.03), with relatively high correlation between methyl mercaptan and dimethyl sulfide (r=0.2476, p=0.005). As for correlation between the amount of bacteria observed in 100 magnifications and each of oral malodor gas components, there was significantly high correlation between soil bacilli and ammonia gas (r=0.4131, p=0.003). As for correlation between the amount of oral microorganisms by shapes and each of oral malodor gases observed in 600 magnifications, there was correlation between the amount of soil bacilli and ammonia gas (r=0.3261, p=0.022) and between the amount of spirilla and sulfureted hydrogen (r=0.3119. p=0.029). As for correlation between activities of oral microorganisms by shapes and oral malodor components observed in 100 magnifications by a phase-contrast microscope, there was very remarkable correlation between activities of soil bacilli and occurrence of ammonia gas (r=0.4813, p=0.000). To put together the general amount and activities of oral microorganisms, correlation between bacterial activities and ammonia gas was recognized only when observed in 100 magnifications (r=0.4181, p=0.003). Of oral microorganism factors, in general, the amount and activities of soil bacilli and the amount of sulfureted hydrogen were found to make great contributions to occurrence of sulfureted hydrogen and ammonia.

The purpose of this study was to examine the relationship between the awareness of dental hygiene students in G college about the department and their occupational choice factors. The subjects in this study were 166 sophomores and juniors at G college, on whom a self- administered survey was conducted from December 1 to 10, 2007. The answer sheets from 142 students were analyzed except 24 incomplete ones. The findings of the study were as follows: 1. Concerning connections between awareness of the characteristics of the department and the goal of getting a job, the students who were not cognizant of the characteristics of the department wanted a job more to get a living and economic stability than the others who were. By academic standing, the students who were in the middle tiers and who didn’t find the major and college education to right up with their alley wanted a job more to get a living and economic stability, and those who were dissatisfied with the occupation of their parents did that more than the others who were satisfied. 2. Regarding awareness of the characteristics of the department and priority for occupational choice, the students who were aware of the characteristics of the department attached more importance to job stability. The job stability was also considered important by the students in the upper middle and lower middle tiers, by those who didn’t find the major and education to right up with their alley and by those who were gratified with the occupation of their parents. 3. As for awareness of the characteristics of the department and on what part of job they put stress, those who were cognizant of the characteristics of the department took welfare benefits seriously, and welfare benefits were also considered important by the upper-tiered students, by those who found the major and education to right up with their alley and by those who were contented with the occupation of their parents. 4. As to awareness of the characteristics of the department and what they worried about in relation to occupational choice, those who were cognizant of the characteristics of the department were more concerned about their future place of abode, and those who excelled and who found the major and education to right up with their alley were concerned about that as well. The students who were satisfied with the occupation of their parents worried about their poor capabilities. 5. As for awareness of the characteristics of the department and what an employee should be like, the students who were aware of the characteristics of the department believed that a truthful and hardworking employee was preferred, and the same opinion was expressed by the students who were in the middle tiers, who found the major and education to right up with their alley and who were dissatisfied with the occupation of their parents. 6. In regard to awareness of the characteristics of the department and primary qualifications for employment, superb expertise and knowhow were stressed by those who were in the middle tiers, who didn’t find the major and education to right up with their alley and who were dissatisfied with the occupation of their parents.