• Imaging Science in Dentistry
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• 제47권3호
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• pp.189-197
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• 2017

Purpose: To quantify artifacts from different root filling materials in cone-beam computed tomography (CBCT) images acquired using different exposure parameters. Materials and Methods: Fifteen single-rooted teeth were scanned using 8 different exposure protocols with 3 different filling materials and once without filling material as a control group. Artifact quantification was performed by a trained observer who made measurements in the central axial slice of all acquired images in a fixed region of interest using ImageJ. Hyperdense artifacts, hypodense artifacts, and the remaining tooth area were identified, and the percentages of hyperdense and hypodense artifacts, remaining tooth area, and tooth area affected by the artifacts were calculated. Artifacts were analyzed qualitatively by 2 observers using the following scores: absence (0), moderate presence (1), and high presence (2) for hypodense halos, hypodense lines, and hyperdense lines. Two-way ANOVA and the post-hoc Tukey test were used for quantitative and qualitative artifact analysis. The Dunnet test was also used for qualitative analysis. The significance level was set at P<.05. Results: There were no significant interactions among the exposure parameters in the quantitative or qualitative analysis. Significant differences were observed among the studied filling materials in all quantitative analyses. In the qualitative analyses, all materials differed from the control group in terms of hypodense and hyperdense lines (P<.05). Fiberglass posts did not differ statistically from the control group in terms of hypodense halos(P>.05). Conclusion: Different exposure parameters did not affect the objective or subjective observations of artifacts in CBCT images; however, the filling materials used in endodontic restorations did affect both types of assessments.

• 대한장애인치과학회지
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• 제9권2호
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• pp.91-97
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• 2013

The objective of this study was to explore perceptions of dental student of patients with special care. Their satisfaction with education, and their professional attitudes and behavioral intentions concerning treating these patients were the issues of this paper. Paper-and-pencil survey data were collected from 289 dental students at the school of dentistry, Seoul National University. Most respondents agreed that it is important to be educated about providing care for patients with special needs at the school. The higher grade students they are, they got the higher degree of understanding about treating these patients and the more satisfaction with the education. However, their intentions to treat these patients in their future professional lives were negatively correlated with degree of students. Based on these findings, it is recommended that school curriculum about treating patients with special care be reconsidered to develop students' comfort level in treating special needs populations.

• 한국임상약학회지
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• 제29권1호
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• pp.33-44
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• 2019

Objective: This study attempts to gauge the necessity of contraceptive education for women defecting from North Korea (NKDWs). Methods: We conducted in-depth interviews with six NKDWs who had lived in the Republic of Korea (ROK) for more than three years, to understand the subjects' perceptions, experiences, and opinions regarding contraception. Thematic analyses were performed using qualitative data provided in the survey results. Results: Before their defections from North Korea, none of the NKDWs had received any sex education. Loop is the only contraceptive method available to married women in ROK. After defection, NKDWs were provided information about contraceptive options available in China, but they could not fully understand this information. Furthermore, the information they received was not accurate. Thus, NKDWs had a high need for contraceptive sex education. As per our survey, their preferred education method was at least 3 lessons plus 1 : 1 counseling, as necessary. Conclusion: This study indicates that a necessity exists for development of a sex education program for NKDWs to enhance their contraceptive knowledge. Thus, government and health managers have a role to play in developing such a program.

• Journal of Yeungnam Medical Science
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• 제21권1호
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• pp.51-59
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• 2004

Background: The objective of this study is to evaluate the relationship between chewing ability and health status in order to provide basic information for the development of program which may lead to an improvement of a the elderly health status in urban areas. Materials and methods: The subjects of this study were 128 elderly urban female over the age of 65 who reside at house. The data were collected from May 21 to August 20, 2001, through questionnaires about nutrient intake status, direct measurement of anthropometrics, and oral examinations. Results: In terms of remaining teeth, there was significant negative relationship between age and number of remained teeth. The average number of remained teeth our subjects was $13.1{\pm}10.6$. About sixty five percent of the subjects were denture users (partial or full dentures) and there was positive relationship between age and the percentage of denture user. There was a significant negative correlation between age and chewing ability. The group that was able to chew had more remained teeth than the other group. Conclusion: This study suggests that there is strong positive relationship between chewing ability (remaining teeth) and elderly health status in urban areas, and the importance of preserving original teeth to improve the elderly health status in the public health program.

• 대한치과교정학회지
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• 제44권2호
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• pp.69-76
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• 2014

Objective: This study aimed to evaluate the accuracy and precision of polyurethane (PUT) dental arch models fabricated using a three-dimensional (3D) subtractive rapid prototyping (RP) method with an intraoral scanning technique by comparing linear measurements obtained from PUT models and conventional plaster models. Methods: Ten plaster models were duplicated using a selected standard master model and conventional impression, and 10 PUT models were duplicated using the 3D subtractive RP technique with an oral scanner. Six linear measurements were evaluated in terms of x, y, and z-axes using a non-contact white light scanner. Accuracy was assessed using mean differences between two measurements, and precision was examined using four quantitative methods and the Bland-Altman graphical method. Repeatability was evaluated in terms of intra-examiner variability, and reproducibility was assessed in terms of interexaminer and inter-method variability. Results: The mean difference between plaster models and PUT models ranged from 0.07 mm to 0.33 mm. Relative measurement errors ranged from 2.2% to 7.6% and intraclass correlation coefficients ranged from 0.93 to 0.96, when comparing plaster models and PUT models. The Bland-Altman plot showed good agreement. Conclusions: The accuracy and precision of PUT dental models for evaluating the performance of oral scanner and subtractive RP technology was acceptable. Because of the recent improvements in block material and computerized numeric control milling machines, the subtractive RP method may be a good choice for dental arch models.

• 대한치과의사협회지
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• 제53권4호
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• pp.238-248
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• 2015

Sleep related breathing disorders(SRBDs) are a group of diseases accompanied by difficulties in respiration and ventilation during sleep. Central sleep apnea, obstructive sleep apnea(OSA), sleep-related hypoventilation, and hypoxemia disorder are included in this disease entity. OSA is known to be the most common SRBDs and studies show its significant correlation with general health problems including hypertension, arrhythmia, diabetes, and metabolic syndrome. The diagnostic process of OSA is composed of physical examinations of the head and neck area and also the oral cavity. Radiologic studies including cephalography, CT, MRI, and fluoroscopy assist in identifying the site of obstruction. However, polysomnography(PSG) is still considered the gold standard for the diagnosis of OSA since it offers both qualitative and quantitative recording of the events during a whole night's sleep. The dentist who is trained in sleep medicine can easily identify patients with the risk of OSA starting from simple questions and screening questionnaires. Diagnosis is the first step to treatment and considering the high rate of under-diagnosis for OSA the dentist may play a substantial role in the diagnosis and treatment of OSA which will eventually lead to the well-being of the patient as a whole person. So the objective of this article is to assist dental professionals in gaining knowledge and insight of the diagnostic measures for OSA including PSG.

• 대한치과교정학회지
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• 제49권1호
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• pp.3-11
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• 2019

Objective: The purpose of this study was to investigate the influence of heritability on the craniofacial soft tissue cephalometric characteristics of monozygotic (MZ) twins, dizygotic (DZ) twins, and their siblings (SIB). Methods: The samples comprised Korean adult twins and their siblings (mean age, 39.8 years; MZ group, n = 36 pairs; DZ group, n = 13 pairs of the same gender; and SIB group, n = 26 pairs of the same gender). Thirty cephalometric variables were measured to characterize facial profile, facial height, soft-tissue thickness, and projection of nose and lip. Falconer's method was used to calculate heritability (low heritability, $h^2$ < 0.2; high heritability, $h^2$ > 0.9). After principal components analysis (PCA) was performed to extract the models, we calculated the intraclass correlation coefficient (ICC) value and heritability of each component. Results: The MZ group exhibited higher ICC values for all cephalometric variables than DZ and SIB groups. Among cephalometric variables, the highest ${h^2}_{(MZ-DZ)}$ and ${h^2}_{(MZ-SIB)}$ values were observed for the nasolabial angle (NLA, 1.544 and 2.036), chin angle (1.342 and 1.112), soft tissue chin thickness (2.872 and 1.226), and upper lip thickness ratio (1.592 and 1.026). PCA derived eight components with 84.5% of a cumulative explanation. The components that exhibited higher values of ${h^2}_{(MZ-DZ)}$ and ${h^2}_{(MZ-SIB)}$ were PCA2, which includes facial convexity, NLA, and nose projection (1.026 and 0.972), and PCA7, which includes chin angle and soft tissue chin thickness (2.107 and 1.169). Conclusions: The nose and soft tissue chin were more influenced by genetic factors than other soft tissues.

• 대한감각통합치료학회지
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• 제17권3호
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• pp.1-13
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• 2019

목적 : 본 연구는 능동적 구강놀이 병행한 Ayres Sensory Integration^®(ASI^®) 적용이 아동의 구강 민감도와 섭식행동의 문제에 미치는 영향에 대해 알아보고자 하였다. 연구방법 : 발달지연으로 진단받은 만 3세 6개월의 남자 아동을 대상으로 2018년 8월부터 2018년 9월까지 능동적 구강놀이 병행한 Ayres Sensory Integration^®(ASI^®)를 실시하였다. 실험설계는 단일사례연구(single-subject design) 중 ABA'설계를 사용하였고 15회기의 중재를 시행하였다. 중재기간 동안 아동의 구강민감도 변화를 측정하기 위해 임상 구강민감도 측정(Measuring Oral Sensitivity in Practice)을 실시하였다. 구강감각처리 어려움으로 섭식활동에 영향을 주는 행동은 한국형 섭취 행동 검사(Korean Children's Eating Behavior Inventory; K-CEBI), 식품 섭취 빈도 체크리스트를 중재 전후로 실시하였다. 결과 : 능동적 구강놀이와 ASI 중재기간 동안 임상 구강민감도와 섭취행동의 문제는 감소하였고 편식행동에는 변화가 없었다. 결론 : 능동적 구강놀이 병행한 ASI 중재는 아동의 구강민감도와 섭취행동의 문제를 감소하는데 긍정적인 효과가 있었다.

• 치위생과학회지
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• 제16권1호
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• pp.53-61
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• 2016

이번 연구는 2009년 4월부터 9월까지 대전 동구보건소에서 실시하는 노인 스케일링-불소도포 사업에 참여한 노인 503명을 대상으로 잔존치아수와 강도별 30가지 음식섭취 능력, 구강건강관련 삶의 질(OHIP-14)의 관계를 조사하였다. 그 결과, 음식섭취능력에 따른 총 잔존치아수는 모든 음식을 섭취할 수 있는 1군 $21.78{\pm}8.27$개, 26가지 음식을 섭취할 수 있는 2군 $16.75{\pm}7.87$개, 16가지 음식을 섭취할 수 있는 3군 $14.68{\pm}9.77$개, 8가지 음식을 섭취할 수 있는 4군 $9.93{\pm}8.13$개, 모든 음식을 섭취할 수 없는 5군 $10.18{\pm}8.37$개로 1군, 2~3군, 4~5군 간의 유의한 차이가 있었다. 보철 포함 대합구치수는 1군 $2.80{\pm}2.63$개, 2군 $2.16{\pm}2.44$개, 3군 $1.73{\pm}2.30$개, 4군 $0.78{\pm}1.68$개, 5군은 $0.51{\pm}1.22$개으로 1, 2군과 5군의 유의한 차이가 있어서 고정성 보철물을 포함한 대합구치는 음식섭취능력에 유의한 영향을 미쳤다. OHIP-14는 1군 $2.16{\pm}3.37$, 2군 $4.35{\pm}6.09$, 3군 $7.23{\pm}7.53$, 4군 $11.20{\pm}3.40$, 5군 $18.15{\pm}8.55$으로 모든 군 간 유의한 차이가 있고 음식섭취능력이 좋을수록 구강건강관련 삶의 질이 양호하였다. 강도별 음식섭취능력과 잔존치아수가 OHIP-14에 미치는 영향을 분석한 결과, 단단한 음식 섭취능력은 OHIP-14에 유의한 영향이 없었으며 중강도 음식섭취능력, 무른 음식 섭취능력 총 잔존치아수 순으로 OHIP-14에 영향을 미쳤다. OHIP-14와 음식의 상관관계는 참외(-0.701), 삶은 닭(-0.664), 사과(-0.659), 우엉조림(-0.632), 배추김치(-0.626), 양갱(-0.624), 오이소박이(-0.618), 삼겹살(-0.618), 갈비찜(-0.615), 생선조림(-0.603) 순으로 강한 음의 관계를 나타내었다. 따라서, 노인의 구강건강 삶의 질 유지와 향상을 위해 21개 이상의 자연치아를 유지하고 자연치아가 상실된 경우 육류와 채소, 과일류를 충분히 섭취할 수 있도록 고정성 보철물 수복이 필요하며 이를 위한 적절한 노인 구강보건사업과 치과 건강보험정책이 고려되어야 할 것이다.

• 대한치과교정학회지
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• 제50권2호
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• pp.108-119
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• 2020

Objective: The primary objective of this study was to quantitatively analyze the bone parameters (thickness and density) at four different interdental areas from the distal region of the canine to the mesial region of the second molar in the maxilla and the mandible. The secondary aim was to compare and contrast the bone parameters at these specific locations in terms of sex, growth status, and facial type. Methods: This retrospective cone-beam computed tomography (CBCT) study reviewed 290 CBCT images of patients seeking orthodontic treatment. Cortical bone thickness in millimeters (mm) and density in pixel intensity value were measured for the regions (1) between the canine and first premolar, (2) between the first and second premolars, (3) between the second premolar and first molar, and (4) between the first and second molars. At each location, the bone thickness and density were measured at distances of 2, 6, and 10 mm from the alveolar crest. Results: The sex comparison (male vs. female) in cortical bone thickness showed no significant difference (p > 0.001). The bone density in growing subjects was significantly (p < 0.001) lower than that in non-growing subjects for most locations. There was no significant difference (p > 0.001) in bone parameters in relation to facial pattern in the maxilla and mandible for most sites. Conclusions: There was no significant sex-related difference in cortical bone thickness. The buccal cortical bone density was higher in females than in males. Bone parameters were similar for subjects with hyperdivergent, hypodivergent, and normodivergent facial patterns.