• Journal of Korean society of Dental Hygiene
• /
• v.3 no.2
• /
• pp.157-168
• /
• 2003

The purpose of this study was to examine the relationship of oral state and health condition among elderly people. The subjects in this study were 220 senior citizens who were randomly selected from among dwellers in Eunpyeong-gu and Jongno-gu, Seoul. A survey was conducted by one-on-one interview to find out their oral state and health condition. The collected data were analyzed with SPSS 10.0 program, and variance analysis, correlation analysis and regression procedure were employed. The findings of this study were as follows: First, Regarding subjective oral health state, 52.3 percent of the elderly people, more than the half, considered their mouth to be in good health. The number of their mean remaining permanent teeth was 14.85, which was one of the indexes to indicate their objective oral state. Second, Concerning their abnormal oral health experience, 75 percent didn't feel that their masticatory force was good enough, and 55.9 percent felt pain in their teeth, 70.0 percent suffered from mouth dryness. Those fact showed that a lot of the elderly people felt there was something wrong with their oral cavity, and the unhealthy oral state made it difficult for them to eat food, as their masticatory force weakened and they couldn't get a good taste for food. Third, Those who viewed their oral cavity as healthy thought that they were in good shape, and there was a significant correlational relationship between their subjective oral and overall physical health states. Their own perception of oral state made a difference to their subjective health status, and the subjective oral health was significantly related to ADL as well, which implied that their ADL was different according to the way they looked at their own oral health status.

• Journal of Korean society of Dental Hygiene
• /
• v.15 no.4
• /
• pp.555-563
• /
• 2015

Objectives: The purpose of the study is to investigate the effect of oral health education for the elderly using $Qscan^{TM}$. Methods: This study was a quasi-experiment design of nonequivalent control group pretest-posttest design carried out by oral health education from January 17 to March 7, 2015. The subjects were 64 elderly people over 65 years old who had more than one remaining teeth in the anterior teeth and canines living in Hongseong-gun and assigned to 33 control group and 31 intervention group. The intervention group was measured only by $Qscan^{TM}$. The educational effect between two groups were evaluated using oral health behavior, gingivitis index, and plaque index. After Institutional Review Board from Namseoul N University, the elderly people participated in the study. Results: The intervention group showed lower plaque index of percent reduction than the control group. The two groups showed a significant difference in gingival index after the oral health education(p<0.05), but did not show a significant difference in oral health behavior after the oral health education(p<0.05). Conclusions: The effect of oral health education through the motivation of $Qscan^{TM}$ was very effective in the comparison of oral health behavior, gingival index and plaque index.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.37 no.1
• /
• pp.36-42
• /
• 2011

Introduction: The current study examined the morphological characteristics of maxillary sinus septum by computed tomography (CT). Materials and Methods: Two hundred and four patients (408 maxillary sinuses) who visited dental clinic were evaluated. CT were examined. The height of the septum measured from the sinus floor to the apex of the septum more than 3 mm was defined as "sinus septum". Results: The prevalence of sinus septa was 21.3% (87/408), and 31.4% (64/204) of patients had more than 1 sinus septum. Females showed higher and thinner sinus septa than males. The anatomic location of the septa were distributed in the 2nd molar region (43.7%), 1st molar region (31.0%), 2nd premolar region (21.8%) and 1st premolar region (3.5%). In 57 patients with chronic disease, there was no significant difference between sinus disease and the presence of sinus septa. The loss of remaining teeth and teeth adjacent to the sinus septum area was not related to the presence of sinus septa. Older subjects showed a reduced height and length of the septum, and a thicker septum. Conclusion: These results show that the maxillary sinus septum undergoes atrophy with age.

• Restorative Dentistry and Endodontics
• /
• v.39 no.3
• /
• pp.172-179
• /
• 2014

Objectives: This study aimed to assess the effect of 38% carbamide peroxide on the microleakage of class V cavities restored with either a silorane-based composite or two methacrylate-based composites. Materials and Methods: A total of 96 class V cavities were prepared on the buccal surface of extracted human teeth with both enamel and dentin margins and were randomly assigned into three groups of Filtek P90 (3M-ESPE) + P90 system adhesive (3M-ESPE)(group A), Filtek Z250 (3M-ESPE) + Adper Prompt L-Pop (3M-ESPE)(group B) and Filtek Z350XT (3M-ESPE) + Adper Prompt L-Pop (group C). Half of the teeth were randomly underwent bleaching (38% carbamide peroxide, Day White, Discus Dental, applying for 15 min, twice a day for 14 day) while the remaining half (control) were not bleached. Dye penetration was measured following immersion in basic fuchsine. Data were statistically analyzed using Kruskal-Wallis and Mann-Whitney U tests at a level of 0.05. Results: No significant differences were found between composites in the control groups in enamel (p = 0.171) or dentin (p = 0.094) margins. After bleaching, microleakage of Z250 (in enamel [p = 0.867] or dentin [p = 0.590] margins) and Z350 (in enamel [p = 0.445] or dentin [p = 0.591]margins) did not change significantly, but the microleakage of P90 significantly increased in both enamel (p = 0.042) and dentin (p = 0.002) margins. Conclusions: No significant differences were noted between the bleached and control subgroups of two methacrylate-based composites in enamel or dentin margins. Microleakage of silorane-based composite significantly increased after bleaching.

• Journal of Dental Rehabilitation and Applied Science
• /
• v.27 no.2
• /
• pp.223-231
• /
• 2011

The purpose of this case report is to introduce new attachment system(milled titanium bar with $Locator^{(R)}$ attachment) for implant supported overdenture in maxillary edentulous patients. A 56-years-old male patient visited the hospital due to the mobility of his maxillary fixed partial dentures(10-unit bridge). Including temporomandibular joint(TMJ), there was no specific PMHs to influence dental treatment. In radiographic and clinical evaluation, there was a severe bone resorption and mobility in maxillary teeth. Accordingly all the remaining maxillary teeth was extracted and fabrication of implant supported overdenture was planned. The milled titanium bar with $Locator^{(R)}$ was designed as an attachment system, considering the stability and retention of denture, masticatory efficiency, oral hygiene care, esthetics, pronunciation, and patient's financial state. The milled titanium bar was manufactured using CAD/CAM technology, and $Locator^{(R)}$ attachment connected to the bar by tap & drill method. For over 1-year, in terms of function and esthetics, satisfactory result was obtained.

• Journal of Dental Rehabilitation and Applied Science
• /
• v.32 no.4
• /
• pp.307-313
• /
• 2016

Overdenture is one of the methods of patients with severely worn dentition. Remaining natural teeth help preserve alveolar bone and proprioception and provide rigid support. Also, overdenture distributes the concentrated stress applied to the abutment tooth and denture supporting tissues. There is an advantage that it can provide long-term stability to denture. In this case, the patient with only a few teeth due to severe wear and caries was satisfied with good function and favorable esthetics by using overdenture.

• Journal of Korean society of Dental Hygiene
• /
• v.4 no.1
• /
• pp.81-91
• /
• 2004

The ultimate purpose of this study is to provide the basic data for effective intervention of the patients complaining of their aspects and themselves and to help dental hygienists of keep them remaining healthy effectively. The data was collected by questions from 269 people including the outpatients requiring regular care from dental clinic from December 10, 2003 to January 10, 2004. Secord & Jourard's apparatus which measures the degree of self-satisfaction to the body image and Rosenberg's equipment measuring the degree of self-respect were used for this study. The data were analysed using a computerized program named statistical package for social science including t-test, ANOVA and Pearson-correlation coefficient. The result's of this study were summarized as follows: 1. The body image and the sense of self-respect were decided by the various characters of the inquired person. Comparing the inquired person's body image in terms of general background, they showed a big difference in sociability(p=0.004), age(p=0.003), sex(p=0.043). However the experience accident any and the frequency of visiting dental clinic had little effect on deciding their body image. Comparing the self-respect. in terms of the general background, they showed a significant. difference in sociability(p=0.002), age(p=0.041), experience of any accident(p=0.012), whereas age, sex, religion, the frequency of having treatment didn't show any difference with them. 2. The relationship between the score of their body image and the sense of self-respect was positively correlated(r=0.391, p=0.000).

• Restorative Dentistry and Endodontics
• /
• v.40 no.1
• /
• pp.44-49
• /
• 2015

Objectives: This study compared the ability of several techniques to remove calcium hydroxide (CH) from the root canal and determined the influence of CH residues on the accuracy of the electronic apex locator. Materials and Methods: Root canals of 90 human maxillary lateral incisors with confirmed true working length (TWL) were prepared and filled with CH. The teeth were randomly assigned to one of the experimental groups according to the CH removal technique (n = 14): 0.9% saline; 0.9% saline + master apical file (MAF); 17% ethylenediamine tetraacetic acid (EDTA); 17% EDTA + MAF; 5.25% sodium hypochlorite (NaOCl); 5.25% NaOCl + MAF. Six teeth were used as negative control. After CH removal, the electronic working length was measured using Root-ZX (Morita Corp.) and compared with TWL to evaluate Root-ZX accuracy. All specimens were sectioned longitudinally, and the area of remaining CH (CH) and total canal area were measured using imaging software. Results: The EDTA + MAF and NaOCl + MAF groups showed better CH removal than other groups (p < 0.05). Root-ZX reliability to prevent overestimated working length to be > 85% within a tolerance of ${\pm}1.0mm$ (p < 0.05). There was strong negative correlation between amount of CH residues and EAL accuracy (r = -0.800 for ${\pm}0.5mm$; r = -0.940 for ${\pm}1.0mm$). Conclusions: The mechanical instrumentation improves the CH removal of irrigation solutions although none of the techniques removed the dressing completely. Residues of CH medication in root canals affected the accuracy of Root-ZX adversely.

• Restorative Dentistry and Endodontics
• /
• v.40 no.1
• /
• pp.37-43
• /
• 2015

Objectives: Some antioxidants are believed to restore dentin bond strength after dental bleaching. This study was done to evaluate the influence of antioxidants on the bond strength of bleached bovine dentin. Materials and Methods: Thirty incisors were randomly assigned to 10 groups (two unbleached control and eight bleached groups:immediate bonding IB, 4 wk delayed bonding DB, 10% sodium ascorbate treated SA, 10% ${\alpha}$-tocopherol treated TP groups). Teeth in half of groups were subjected to thermal stress, whereas the remaining groups were not. Resin-dentin rods with a cross-sectional area of $2.25mm^2$ were obtained and microtensile bond strength was determined at a crosshead speed of 1 mm/min. Fifteen specimens were prepared for SEM to compare the surface characteristics of each group. The change in dentin bond strength from thermal stress and antioxidant treatment was evaluated using two-way analysis of variance (ANOVA) and Sheffe's post hoc test at a significance level of 95%. Results: The control group exhibited the highest bond strength values, whereas IB group showed the lowest value before and after thermocycling. The DB group recovered its bond strength similar to that of the control group. The SA and TP groups exhibited similar bond strength values with those of the control and DB groups before thermocycling. However, The TP group did not maintain bond strength with thermal stress, whereas the SA group did. Conclusions: Applying a 10% sodium ascorbate solution rather than 10% ${\alpha}$-tocopherol solution for 60 sec is recommended to maintain dentin bond strength when restoring non-vitally bleached teeth.

• Imaging Science in Dentistry
• /
• v.48 no.4
• /
• pp.245-254
• /
• 2018

Purpose: To assess the effects of object position in the field of view (FOV) and application of a metal artifact reduction (MAR) algorithm on the diagnostic accuracy of cone-beam computed tomography (CBCT) for the detection of vertical root fractures(VRFs). Materials and Methods: Sixty human single-canal premolars received root canal treatment. VRFs were induced in 30 endodontically treated teeth. The teeth were then divided into 4 groups, with 2 groups receiving metal posts and the remaining 2 only having an empty post space. The roots from different groups were mounted in a phantom made of cow rib bone, and CBCT scans were obtained for the 4 different groups. Three observers evaluated the images independently. Results: The highest frequency of correct diagnoses of VRFs was obtained with the object positioned centrally in the FOV, using the MAR algorithm. Peripheral positioning of the object without the MAR algorithm yielded the highest sensitivity for the first observer (66.7%). For the second and third observers, a central position improved sensitivity, with or without the MAR algorithm. In the presence of metal posts, central positioning of the object in the FOV significantly increased the diagnostic sensitivity and accuracy compared to peripheral positioning. Conclusion: Diagnostic accuracy was higher with central positioning than with peripheral positioning, irrespective of whether the MAR algorithm was applied. However, the effect of the MAR algorithm was more significant with central positioning than with peripheral positioning of the object in the FOV. The clinical experience and expertise of the observers may serve as a confounder in this respect.