• Journal of Convergence for Information Technology
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• v.8 no.6
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• pp.9-14
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• 2018

The purpose of this study was to evaluate the relationship between past smoking period and tooth loss in Korean elderly based on the data the Sixth Korea National Health and Nutrition Examination Survey (2013-2015). The study subjects were 4,037 elderly people (1,737 men and 2,300 women) over 65 years old. The statistical analyses were conducted by applying complex sample analysis technique using SPSS/WIN 22.0(${\alpha}=0.05$). The average number of tooth loss in Korean elderly was 11.14. The analysis result of the relationship of the tooth loss according to the past smoking period, the risk of tooth loss was more than twice higher in over 30 years past smoking period group than in under 10 years past smoking period group. In conclusion, the long term past smoking were associated with tooth loss in Korean elderly. Therefore, it seems to need a continuous oral health care through non-smoking policy and education.

• Oral Biology Research
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• v.42 no.4
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• pp.216-221
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• 2018

The purpose of this study was to assess the clinical outcomes of active periodontal therapy (APT) and supportive periodontal therapy (SPT) through loss of teeth in the Korean patients with aggressive periodontitis. The number of missing and residual teeth, probing pocket depth were examined in 33 patients diagnosed with aggressive periodontitis at the baseline and who had participated in APT and SPT for 3 years or more. A 20 and 3 teeth were lost during the APT and SPT, respectively. The mean tooth loss rate of 0.13 per patient and year. There was no significant statistical difference in clinical improvement between the smoker and non-smoker groups. Within the limitation of this study, APT combined with supportive therapy could decrease the risk of tooth loss in patients suffering from aggressive periodontitis.

• Journal of Periodontal and Implant Science
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• v.33 no.3
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• pp.383-393
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• 2003

The aim of this retrospective study was to compare the amount of marginal bone loss between upper anterior area and upper posterior area with 71 upper single-tooth restorations on 2 stage machined $Br{{\aa}}nemark$ implants since Jan 1995. The second aim was to compare the bone defect group which had dehiscence and fenetration and the others in the upper anterior region. The results were as follows. 1. The most frequent reason of missing tooth in the upper anterior region was trauma by 61%. While upper posterior region showed various reasons such as congenital missing, advanced periodontitis, trauma. 2. Peri-implantitis with fistula occurred 1 of 41 implants in the upper anterior group in 1 year after loading and 2 of 32 implants in the upper posterior group failed before loading. The 1 year success rate of upper anterior group was 97.56 %, and 93.75 % for upper posterior group. 3. The mean marginal bone loss in the upper anterior group was 0.44${\pm}$0.25 mm, while 0.57${\pm}$0.32 mm in the upper posterior group. There was statistically significant difference in the amount of mean marginal bone loss (P${\pm}$0.10 mm at one year, and 0.48${\pm}$0.26 mm for the control group. No statistically significant difference of mean marginal bone loss was showen between bone defect group and the others at implantation. According to the results, the upper anterior region showed less marginal bone loss than the upper posterior region. In case of missing single upper tooth, careful consideration on recipient residual ridge to determine proper implant diameter and length, sufficient healing time, proper loading would lead to implant success. Single tooth implants in the maxilla seemed to be an alternative to fixed partial dentures without damage to adjacent teeth.

• Journal of Periodontal and Implant Science
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• v.32 no.1
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• pp.51-59
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• 2002

The aim of the present study was to investigate the distribution of periodontally hopeless teeth in patients who had not been treated. Five hundred nineteen teeth of 163 patients who had visited at the Department of Periodontology, Chonbuk National University Hospital during the period from January 1999 to July 2001 were selected as a periodontally hopeless tooth. Selection criteria were as follows: 1) probing pocket depth more than 8mm, 2) tooth mobility of degree III, 3) radiographic bone loss more than 75%. The contralateral tooth to a hopeless tooth (experimental tooth) was designated as a control tooth. Between the experimental and control tooth, differences in probing pocket depth, tooth mobility and amount of radiographic bone loss were examined as well as correlation. The results showed that hopeless teeth were most frequently found in the maxillary first molar position and least frequently in the maxillary canine position. Differences between experimental and control teeth were 2mm in probing depth, 1 degree in tooth mobility, and 20% in amount of bone loss (p<0.01). The periodontal conditions between the experimental and control teeth showed correlation in general, however, statistical significances were found in posterior teeth positions. Within limitations of this study, it can be concluded that local factors may play a role in deterioration of periodontal disease along with symmetrical character of periodontal disease.

• Journal of the Korea Convergence Society
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• v.7 no.6
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• pp.133-139
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• 2016

This study was to evaluate the change of mineral loss of fTCP and CPP-ACP in artificial caries lesions using QLF-D to compare the remineralization effect of recently developed fTCP and CPP-ACP, which is widely used as a remineralization cream in current dental clinics. Bovine specimens used in this study formed the artificial caries lesion immersing in demineralization solution for 10 days and were divided randomly into the following two groups; Group 1- Tooth Mousse containing 10% CPP-ACP, Group 2- Clinpro Tooth Creme containing 950ppm NaF and fTCP. Two tooth paste were applied to the artificial caries lesion of specimens and they were immersed in artificial saliva for 1 week. Mineral loss of artificial caries lesion was evaluated by fluorescence loss (${\Delta}F$) values using QLF-D. QLF-D analysis showed that the ${\Delta}F$ and ${\Delta}Fmax$ value increased 2.65 and 6.63, respectively, in the Tooth Mousse group, and the mineral loss decreased statistically significantly(p<0.05). However, Clinpro Tooth Creme group had no statistically significant difference. ${\Delta}Fmax$ value of Tooth Mousse group was statistically significant difference compared to the Clinpro Tooth Creme. Therefore, the Tooth Mousse containing 10% CPP-ACP is more effective than Clinpro Tooth Creme containing fTCP in the treatment of remineralization of artificial caries lesions.

• Journal of Periodontal and Implant Science
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• v.23 no.2
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• pp.331-344
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• 1993

The purpose of this study was to investigate the change of tooth mobility and bite force according to periodontal disease severity. Tooth mobility and biting force due to change of viscoelastic property of periodontium were influenced by inflammation of periodontal tissue. 30 patients participated in this study, the periodontal disease severity is evaluated with SBI and attachment loss. SBI and attachment loss were examined by periodontal probe. Tooth mobility was tested two times to each tooth using periotest (Siemens Co, Germany) and bite force was evaluated with MPM-3000 (Nihon Kohden Co, Japan). Statistical analysis was applied to correlation ($r^2$) and regression analysis. The obtained results were as follows : 1. As the attachment loss increased, tooth mobility increased with significance, and they had highly positive correlation ($r^2=0.68$) on entire dentition. 2. As the SBI increased, tooth mobility increased with significance, and they had positive correlation ($r^2=0.37$) on entire dentition. 3. As the attachment loss increased, bite force decreased with significance, and they had highly negative correlation ($r^2=0.42$) on maxillary anterior dentition but low negative correlation ($r^2=0.20$) on the other portion of dentition. 4. As the SBI increased, bite force decreased with significance, and they had highly negative correlation ($r^2=0.31$) on maxillary anterior dentition but low negative correlation ($r^2=0.16$) on the other portion of dentition. 5. As tooth mobility increased, bite force decreased with significance, and they had highly negative correlation ($r^2=0.32$) on maxillary anterior dentition but low negative correlation ($r^2=0.16$) on the other portion of dentition.

• Journal of dental hygiene science
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• v.19 no.3
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• pp.154-161
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• 2019

Background: The market for vitamin drinks is expanding both in Korea and worldwide. However, it was difficult to find studies regarding the possibility of tooth erosion induction due to vitamin drinks. The purpose of the present in vitro study was to evaluate the effect of tooth erosion caused by a few commercial vitamin beverages on bovine teeth enamel in terms of erosion depth and fluorescence loss. Methods: Three experimental groups (vitamin drinks), a positive control group (Coca-Cola), and a negative control group (mineral water) were established. Each group consisted of 5 specimens obtained from sound bovine teeth. The pH and titratable acidity of beverages were measured. Specimens were immersed in the beverages and artificial saliva for 6 and 18 hours, respectively. This cycle was repeated for 5 days. The depth of the tooth loss caused by tooth erosion (erosion depth) and maximum loss of fluorescence (Max ${\Delta}F$) were measured using the microscope and quantified light-induced fluorescence-digital, respectively. For the statistical analysis, the Kruskal-Wallis test and ANOVA were used to compare the erosion depth and Max ${\Delta}F$ of the enamel surfaces. In addition, Spearman correlations were estimated. Results: The pH of the three vitamin beverages ranged from 2.65 to 3.01, which is similar to that of the positive control group. All beverages, except mineral water, had sugar and acidic ingredients. Vitamin drinks and the positive control, Coca-Cola, caused tooth erosion lesions, and showed significant differences in erosion depth compared to mineral water (p<0.05). The vitamin beverages with low pH were associated with high erosion depth and Max ${\Delta}F$. Conclusion: Vitamin drinks have the potential to cause tooth erosion.

• Journal of Korean society of Dental Hygiene
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• v.20 no.5
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• pp.545-559
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• 2020

Objectives: The purpose of this study was to systematically analyze and examine the relationship between the number of lost teeth and quality of life (QoL) among elderly. Methods: Papers published in Korean and English between 2000 and 2020 were searched. Relevant papers were selected by two independent readers according to predefined exclusion criteria. Quality assessment and consistency tests were conducted using ROBIS. Results: Twelve of the 854 studies were targeted, and the analysis confirmed that tooth loss was related to a decrease in the QoL in 11 studies. Tooth loss negatively affected the QoL among the elderly. However, one study indicated that the QoL and number of teeth were not related. Rather, dry mouth affected the QoL, and cavities caused by oral dryness led to tooth loss. Most of the selected studies indicated that the QoL of elderly individuals with a single tooth was higher than that of those with no teeth. Conclusions: This study provides strong evidence that tooth loss in the elderly is associated with impairment of QoL.

• Journal of Periodontal and Implant Science
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• v.34 no.3
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• pp.535-541
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• 2004

The aims of the present study are firstly to investigate the amount of bone loss around non-submerged implants placed in the posterior region and secondly to investigate the relationship between inter-implant and implant-tooth distance and peri-implant bone loss. Thirty-one subjects with 60 implants were selected consecutively from the implant patient pool at the department of Chonbuk National University Hospital. To be included in the study subject, the implant should have been functioned more than 6 months after loading. Inter-implant and implant-tooth distance, distance between implant shoulder and the first bone contact with the implant(DIB) were measured from the scanning image of the radiograph of each implant. The result showed that; 1. inter-implant distance has a statistically significant relationship with DIB in Pearson correlation analysis. 2. the DIB at the implant facing surface of the implant was greater than that of tooth facing surface of the implant. Within limitation of this study, it is suggested to place an implant not too closely to adjacent implants, and the presence of a tooth adjacent to an implant may keep the level of tooth-facing surface of the implant. Further studies with a prospective design are needed to elucidate the relationship between bone changes and various dimensions around implants.

• Journal of Trauma and Injury
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• v.36 no.1
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• pp.15-21
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• 2023

Purpose: Dental avulsion injuries have a poor prognosis that largely depends on the immediate steps taken to manage the avulsed tooth. A lack of knowledge about the initial management can lead to tooth loss, with further adverse implications for esthetics, phonetics, and overall growth and function. Hence, the present study aimed to assess parents' knowledge regarding dental avulsion and the variables associated with their knowledge of avulsion injuries. Methods: A series of closed-ended questions on parents' knowledge regarding avulsion, such as immediate management, storage media, handling, and urgency of visiting the dentist, was asked. Univariate associations between the outcomes were assessed using the Pearson chi-square test. The chisquare goodness-of-fit test was used to check whether the sample data were representative of the population. Results: In total, 211 mothers and 149 fathers were included, of whom 46.7% had experienced dental trauma during their own childhood. Sixty-one percent of mothers believed that they knew everything necessary about tooth avulsion and its management. A significant number of participants who thought that they had a good level of knowledge about avulsion chose water, tissue, or paper wrap to transport the tooth, and preferred tap water, alcohol, or antiseptic to clean the avulsed tooth. Conclusions: Both mothers and fathers had poor knowledge about tooth avulsion, indicating that there is an immediate need for educational programs focusing on this issue. Since a substantial proportion of participants believed incorrect information, it is vital to disseminate accurate information.