• Journal of Periodontal and Implant Science
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• 제23권1호
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• pp.183-192
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• 1993

The purpose of this epidermiological analysis was to evaluate the periodontal status of Korean young adults(twenties) in order to provide detail & baseline data for frequence of periodontal disease. Two hundred and fifty young adults, aged 20-29 years, were selected by random sampling. Dental visity, scaling treatment, education, income, toothbrushing frequence & method were checked, and plaque index(Loe and silness), calculus index(Ramfjord), gingival index(Loe and silness), attached gingival width, perio probing depth, gingival recession were measured. The obtained results were as follows. 1. Average plaque index(1.96), calculus index(1.43), gingival index(1.7) were higher in mandible than maxillar. It was most prevalent in lst molar. 2. Average attached gingival width(4.0mm) was wider in maxillar than mandible. It was most prominent in lateral incisor. 3. Pocket depth(>4mm) was distributed in 42% subject, it was higher in mandible than maxilla and most prevalent in 1st molar. 4. Gingival recession(>1mm) was distributed in 94% subject, it was higher in mandible than maxilla, and most prevalant in canine. 5. According to unpaired t-test, palque index, calculus index, gingival index were not statistically significant in history of scaling treatment, level of eduction and account of income, but were showed statistically significant in histrory of dental clinic.(PB0.05) 6. According to ANOVA test, correlation between tooth-brushing(frequence, method) and gingival index was showed statistically significant.(P<0.05) 7. There was gingival recessionof 87% subject in only one time brushing, 80% subject in two time, and 68% subject in three times. There was gingival recessionof 68% subject in leftright direction tooth brushing, 73% subject in upper-low method and 77% subject in combination method.

• 치위생과학회지
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• 제10권1호
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• pp.11-16
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• 2010

본 연구는 2008년 3월부터 2008년 6월까지 S대학 치위생과 3학년들의 스케일링 실습환자를 대상으로 하였으며, 남자 138명, 여자 111명으로 총 249명 대상으로 표본은 비확률표본추출법인 편의추출법에 의해 선정하였다. SPSS 12.0 프로그램을 이용하여 분석하였다. 1. 구강위생관리에서 칫솔질 방법은 횡마법이 65.9%(164명)로 나타났으며, 스케일링 경 험은 57.8%(144명)로 나타났다. 칫솔질 횟수는 2회가 53.8%(134명)로 가장 많았고, 칫솔질 시기는 식사 후가 73.1%(182명)로 나타났다. 구강보조용품은 16.1%(40명)만 이 사용하고 있었다. 2. 부위별 치석지수는 하악이 $0.66{\pm}0.21$, 전치부가 $0.58{\pm}0.23$, 구치부가 $0.57{\pm}0.24$, 상악이 $0.49{\pm}0.26$ 순으로 조사되었으며 평균 치석지수는 $0.57{\pm}0.22$로 나타났다. 3. 칫솔질 방법에 따른 치석지수는 상악은 회전법에 비해 종마법으로 칫솔질을 할수록 치석지수가 높은 것으로 나타났으며, 하악의 전치부, 구치부는 횡마법이나 종마법으로 칫솔질을 할수록 치석지수가 높은 것으로 나타났다. 상악과 하악, 전치부와 구치부 모두에서 통계적으로 유의한 차이를 보였다(p<0.05). 4. 칫솔질 횟수에 따른 치석지수는 상악과 하악, 구치부에서 통계적으로 유의한 차이를 보였다(p<0.05). 5. 칫솔질 시기에 따른 치석지수는 상악과 하악, 전치부와 구치부 모두 칫솔질을 식사 전에 하는 사람의 치석지수가 높은 것으로 나타났으며, 상악과 하악, 전치부와 구치부 모두에서 통계적으로 유의한 차이를 보였다(p<0.05). 6. 구강용품 사용여부에 따른 치석지수는 상악과 하악, 전치부와 구치부에서 구강용품을 사용하지 않는 사람의 치석지수가 높은 것으로 나타났으며, 상악과 하악, 전치부와 구치부 모두에서 통계적으로 유의한 차이를 보였다(p<0.01). 7. 치석지수에 영향을 미치는 요인은 유의수준 0.05를 기준으로 stepwise방법을 적용한 결과 나이, 구강보조용품 사용여부, 성별, 칫솔질 시기가 치석지수에 영향을 미치는 것으로 나타났다. 즉 나이가 많을수록, 구강보조용품을 사용하지 않을수록, 성별이 남자 일수록, 칫솔질을 식사 전에 할수록 치석지수가 높은 것으로 나타났다. 최종 회귀모형은 치석지수 = $0.362^*$나이 + $0.216^*$구강보조용품 사용여부 - $0.161^*$성별 - $0.127^*$ 칫솔질 시기이며 모형의 설명력은 23.4%이었다.

• 한국임상수의학회지
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• 제24권2호
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• pp.192-196
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• 2007

Oral malodor in companion animals is noticed by owners at first and it makes owners unpleasant. Therefore oral malodor affects the relationship between pet and owner. Oral malodor is produced by some putrefactive bacteria which putrefy proteins to volatile sulfur compounds (VSC) such as methyl mercaptan, hydrogen sulfide and dimethyl sulfide in the food remnants. And oral malodor is mostly consisted with these VSC. On oral examinations in dogs with oral malodor, it is common that plaque and calculus index were increased than normal dogs'. But organoleptic method is subjective to evaluate halitosis, in this study we measured VSC using organoleptic method and portable sulfide monitor to clarify the relationship between halitosis and periodontal disease in dogs with halitosis. And we found that plaque index and calculus index were significantly related with VSC (P<0.05, P<0.05) in measurement using Halimeter. However there was not significant relationship between gingivitis index and VSC. In conclusion, there was the significant, positive relationship between periodontal disease and halitosis.

• 치위생과학회지
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• 제9권5호
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• pp.497-506
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• 2009

흡연 청소년의 흡연형태 요인과 구강질환과의 관련성을 조사하여 10대 청소년들의 구강건강을 효율적으로 관리하는데 도움이 될 기초자료를 제공하고자 2009년 6월 1일부터 8월 31일까지 서울지역 소재하고 있는 S병원 건강교육원 5일 금연학교 프로그램에 참석한 일부 중 고등학교 학생 흡연자 156명(남자: 103명, 여자: 50명)과 흡연군과 성별, 연령을 고려하여 짝짓기 방식으로 선정한 비흡연군 176명(남자: 64, 여자: 112명)을 분석대상으로 하였다. 설문지를 이용하여 인구 사회학적 특성, 기초구강건강관리, 흡연형태요인, 자기효능감, 구강건강통제위, 구강건강지식, 구강건강증진행위에 관한 지료를 수집하였다. 구강검사를 실시하여 DMFT index, DT index, MT index, FT index, Plaque index, Calculus index를 사용하여 치아 및 구강위생상태를 평가하여 다음과 같은 결과를 얻었다. 1. 치과방문(p < 0.05), 구강건강 자각적도(p < 0.001), 구강건강관심도(p < 0.01)는 모두 흡연군보다 비흡연군에서 높게 나타나 통계적으로 유의한 차이를 보였다. 2. 자기 효능감(p < 0.05), 구강건강통제위, 구강건강증진행위(p < 0.001), 구강건강지식 모두 비흡연군에서 높게 나타났다. 3. 우식치수(p < 0.001), 치태지수(p < 0.001), 치석지수(p < 0.001)는 비흡연군보다 흡연군에서 높게 나타나 통계적으로 유의한 차이를 보였다. 4. 흡연량이 적을수록 우식치수 (p < 0.05), 치태지수(p < 0.01), 치석지수(p < 0.001)가 낮게 나타나 통계적으로 유의한 차이를 보였다. 5. 우식치수와 자기효능감, 구강건강통제위, 구강건강증진행위와는 유의한 상관성이 있었다.(p < 0.01). 6. 흡연량과 치태지수(p < 0.05), 치석지수(p < 0.05)와 유의한 상관성이 있었다. 7. 다변량 분석결과 흡연 청소년의 우식치수와 유의한 관련성이 있는 요인은 구강건강증진행위(p < 0.05), 치태지수(p < 0.01)이었다. 즉 구강건강증진행위가 높을수록, 치태지수가 낮을수록 우식치수가 적었다.

• Journal of Information Processing Systems
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• 제6권3호
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• pp.335-346
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• 2010

The present study investigates the difficulty of solving the mathematical problem, namely the DLP (Discrete Logarithm Problem) for ephemeral keys. The DLP is the basis for many public key cryptosystems. The ephemeral keys are used in such systems to ensure security. The DLP defined on a prime field $Z^*_p of random prime is considered in the present study. The most effective method to solve the DLP is the ICM (Index Calculus Method). In the present study, an efficient way of computing the DLP for ephemeral keys by using a new variant of the ICM when the factors of p-1 are known and small is proposed. The ICM has two steps, a pre-computation and an individual logarithm computation. The pre-computation step is to compute the logarithms of a subset of a group and the individual logarithm step is to find the DLP using the precomputed logarithms. Since the ephemeral keys are dynamic and change for every session, once the logarithms of a subset of a group are known, the DLP for the ephemeral key can be obtained using the individual logarithm step. Therefore, an efficient way of solving the individual logarithm step based on the newly proposed precomputation method is presented and the performance is analyzed using a comprehensive set of experiments. The ephemeral keys are also solved by using other methods, which are efficient on random primes, such as the Pohlig-Hellman method, the Van Oorschot method and the traditional individual logarithm step. The results are compared with the newly proposed individual logarithm step of the ICM. Also, the DLP of ephemeral keys used in a popular password key exchange protocol known as Chang and Chang are computed and reported to launch key recovery attack.

• 한국임상수의학회지
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• 제24권4호
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• pp.573-576
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• 2007

The purpose of this study was to evaluate the relationship between periodontal disease and halitosis, and to develop a detail clinical protocol for assessing halitosis in animals. We measured the periodontal disease parameters, the degree of halitosis using organoleptic scale method and the concentration of volatile sulfur compounds(VSC) using portable sulfide monitor($Halimeter^{TM}$). In this study, VSC levels by $Halimeter^{TM}$ were found to be significantly associated with periodontal disease parameters(plaque index, calculus index)(P<0.05). We also found that conscious sedation did not affect the measurement of VSC levels.

• 한국치위생학회지
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• 제9권1호
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• pp.153-168
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• 2009

This study was executed to find out the outcome of Incremental Dental Care from September to November, 2004. 40 visitors to oral health center were examined on the oral conditions every week, seven times during above-mentioned period. Various tests were practiced in order to check their oral conditions before and after IDC such as tooth-brushing method/frequency/duration, calculus index, PHP index, halitosis and dental caries activity. Question and answer sheets were presented to student dental hygienists and 40 visitors respectively after IDC program. Results obtained are as follows. 1. Rotation method of toothbrushing increased from 27.8% to 88.9%. for men and increased from 27.3% to 95% for women. 2. Toothbrushing frequency increased from 2.8 times to 3.0 times a day for men and increased from 2.6 times to 3.1 times for women. Toothbrushing duration increased from 2.3 minutes to 2.8 minutes for men and increased from 2.1 minutes to 2.9 minutes for women. 3. Calculus index reduced from 0.5 to 0.1 for men and reduced from 0.7 to 0 for women. PHP index reduced from 3.7 to 3.0 for men and reduced 3.2 to 1.7 for women. However, halitosis didn't mark any significant difference before and after IDC. 4. Saliva buffering capacity of medium plus showed no change for men(94.5%), however increased from 95.4% to 100% for women. Dental caries activity of medium plus in S.mutans reduced by 4.3 times(72.2% to 16.7%) for men and reduced by 2 times(36.4% to 18.1%) for women. LB test results reduced by 1.5 times(50% to 33.3%) for men and reduced by 2.5 times(50% to 18.1%) for women. Alban's test results reduced by 1.4 times(83.3% to 61.1%) for men and reduced by 1.2 times(81.8% to 68.2%) for women. 5. All participants including visitors and students realized the importance of IDC and expressed a great satisfaction with IDC program. In conclusion, it is considered very necessary that IDC program should be maintained and extended to whole country so as to enhance the peoples' oral health conditions.

• 한국치위생학회지
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• 제8권2호
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• pp.13-22
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• 2008

The purpose of this study is to analyze the correlation between cause and the element of mouth odor through measurement and identification of mouth odor and is to apply to effective method for elimination of halitosis, Subjects were 150 people who visited Dong Pusan College and lived in Pusan Cross-sectional survey was used and mouth odor was measured by Oralchroma. Oral examination proceeded with status of tongue plaque distribution and calculus index, Statistical analysis was performed with SPSS version 13.0 for window Among 150 people, 67.3% subjects thought they had halitosis, 89.3% people felt that their mouth odor were the severest as soon as wake-up, Tongue was serious place for halitosis by 53.3% subjects Methylmercaptan and dimethyl sulfide showed the highest correlation by 0.549 index score, Moreover, methyl mercaptan was observed the correlation with brushing time in 0.190 index score and with food intake in 0.177(P<0.05). In conclusion, brushing time and food intake were correlated with mouth odor.

• 한국치위생학회지
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• 제22권3호
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• pp.161-170
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• 2022

Objectives: This study aims to conduct in-depth research on the effect of non-surgical periodontal therapy (NSPT) with the application of a comprehensive dental hygiene care (CDHC) process, and provide basic data for the wide application of CDHC. Methods: From May 8, 2021 to September 24, 2021, mixed-methods research was conducted in 36 patients with periodontal diseases. A paired samples t-test was used to analyze the quantitative research data using IBM SPSS program(ver. 22.0; IBM Corp., Armonk, NY, USA) and qualitative research data were analyzed using the thematic analysis method. Results: With NSPT applying the CDHC process, the perception of periodontal health and self-efficacy of periodontal healthcare were increased (p<0.001). Presence of gingivitis, probing pocket depth, bleeding on probing rate, presence of subgingival calculus, and dental plaque index were reduced (p<0.001). Based on 195 meaningful statements, 26 concepts, 12 sub-themes, and 5 themes , , , and were drawn. Conclusions: The perception of periodontal health and the self-efficacy were improved, and substantial change in the clinical index. The CDHC application allowed the study participants to perceive the importance of dental care and professionalism of dental hygienists.

• Journal of Periodontal and Implant Science
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• 제50권2호
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• pp.83-96
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• 2020

Purpose: The present study aimed to evaluate the clinical benefit of additional toothbrushing accompanying non-surgical periodontal treatment on oral and general health in patients with type 2 diabetes mellitus (T2DM). Methods: We conducted a doubled-blind randomized controlled trial in 60 T2DM patients between June 2013 and June 2014. The patients were randomly assigned to the scaling and root planing (SRP) group; the scaling and root planing with additional toothbrushing (SRPAT) group, in which additional toothbrushing was performed by toothpick methods; or the control group. Microbiological and oral examinations were performed for up to 12 weeks following treatment. Non-surgical treatment was conducted in the experimental groups. The SRP group received scaling and root planing and the SRPAT group received additional toothbrushing with the Watanabe method once a week from the first visit through the fifth visit. The primary outcomes were changes in haemoglobin A1c (or glycated haemoglobin; HbA1c) levels, serum endotoxin levels, and interleukin-1 beta levels. Periodontal health status was measured by periodontal pocket depth, the calculus index, and bleeding on probing (BOP). Results: Both the SRP and SRPAT groups showed improvements in periodontal health and HbA1c, but the SRPAT group showed significantly less BOP than the SRP group. Furthermore, only the SRPAT group showed a statistically significant decrease in serum endotoxin levels. Conclusions: Non-surgical periodontal treatment was effective in improving HbA1c and serum endotoxin levels in T2DM patients. Furthermore, non-surgical treatment with additional tooth brushing had a more favourable effect on gingival bleeding management. Trial RegistrationClinical Research Information Service Identifier: KCT000416.