• Journal of the korean academy of Pediatric Dentistry
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• v.37 no.2
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• pp.186-192
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• 2010

Streptococcus mutans, one of the major causal agents of dental caries, is component of the dental plaque. It produces various organic acids such as lactic acid which is the end-product of glycolysis, and this leads to dental caries. A new system using species-specific monoclonal antibodies was developed to detect Streptococcus mutans in saliva. The system quickly detects salivary Streptococcus mutans in 30min and classifies the result into two levels. The purpose of this study was to investigate correlation between monoclonal antibody-based detecting system and selective medium-based detecting methods. Children's deft indices were also compared with Streptococcus mutans counts in MSB agar plate. Subjects consisted of 15 children in the age of 3 to 6 years. They were assigned to three groups : Group I(deft index = 3), Group II(deft index $\leqq$3), Group III(deft index $\geqq$4). The results are as follows : 1. The rate of children with positive response was 13.3% and with negative response was 86.7% in the result of Saliva-checkTM Mutans test kit. 2. There was a positive correlation between monoclonal antibody-based detecting system and selective medium-based detecting methods(p<0.05). 3. Streptococcus mutans counts in MSB agar plate were irrelevant to deft of children(p=0.34).

• Journal of Oral Medicine and Pain
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• v.35 no.4
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• pp.265-273
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• 2010

Understanding patients' expectation for health visits and providing appropriate care may increase patients' satisfaction with health care, leading to more positive treatment outcome. The study aimed to investigate expectations of the patients with temporomandibular disorders (TMD) at their first visit to university-based orofacial pain clinic and to evaluate any relation with duration of pain, presence of previous treatment, pain severity and pain interference. Inclusion criterion was patients aged over and 18 years old and diagnosed as TMD during 3 months' period from Aug to Nov 2010. They were asked to complete the questionnaires for patients' expectation and the Brief Pain Inventory (BPI) at waiting room prior to consultation. 322 TMD patients participated in the study(M:F=1:1.5, mean age=36 years old). The study indicated that the most important top 3 expectations were 'cure of pain', 'understanding their problem' and 'doctor-patient communication' in order. This finding was not affected by gender, duration and previous treatment history but affected by sub-category of TMD and BPI pain severity and pain interference. 'Pain relief' and 'understanding their problems' were relatively highlighted in the patients with muscle disorders and combination (joint-muscle) disorders of TMD than those with joint disorders who wanted communication and further investigation relatively more (p=0.000). While expectation for pain relief was expected more with increase of pain severity and interference, patients with mild level of pain severity and interference expected communication and further investigation relatively more (p=0.000, 0.017, respectively). Based on the results of the study, though pain relief was the primary concern for TMD patients suffering from pain, their satisfaction with care may be increased by explanation for etiology and mechanism of TMD to make them understand their problems better and doctor-patient communication and collaborative decision-making for treatment. Importance of patient-centered consultations and availability of written material or web sites for patient information should be stressed out.

• The Journal of Korean Academy of Prosthodontics
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• v.46 no.1
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• pp.42-52
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• 2008

Purpose: Resonance Frequency Analysis(RFA) technique can be used as an effective method in measuring the implant stability and documenting the clinical results. This technique also determines how stable the implant is before performing a prosthetic practice. Having become one the guidelines of the implant therapy whose final objective is the immediate loading, the $Osstell^{TM}$ mentor is giving a lot of information to the clinicians recently. In this communication, experiments were performed to investigate how reliable the measured ISQ values by $Osstell^{TM}$ mentor are, and to see if those are also stable even after sterilization. As five objectives: 1) How stable measured ISQ values after fixation $Smartpeg^{TM}s$ for 400 times. 2) How stable measured ISQ values after 'attach-detach'$Smartpeg^{TM}'s$ for 400 times. 3) How stable measured ISQ values after clinical sterilization methods. 4) How stable measured ISQ values after repeatedly sterilization in autoclave for 10 times. 5) What is the critical temperature which is lost the magnetism of $Smartpeg^{TM}$. Materials and Methods: Clinical sterilization methods(Autoclave sterilization, Dentistar sterilization, Ultra violet sterilization, Vacuum dry unit sterilization, Boiling water sterilization, combined $H_{2}O_{2}$ and Alcohol sterilization).$Smartpeg^{TM}s$. D3 Block bone($3{\times}9{\times}2cm$). Osstem implant(${\emptyset}4.1$-10mm).$Osstell^{TM}$ mentor. Individual experiment was used 8 number of $Smartpeg^{TM}s$ and they had measured to ISQ values of before experiment and after experiment. Results: 1. The measured ISQ values did not change after fixation $Smartpeg^{TM}s$ for 400 times. 2. There was no significant changes in the measured ISQ values of 'attach-detach $Smartpeg^{TM}s'$ for 400 times. 3. The measured ISQ values did not change after the usual clinical sterilization methods. 4. The measured ISQ values did not change after sterilization in autoclave for 10 times. 5. It was impossible to exactly measure the critical temperature which is lost the magnetism of $Smartpeg^{TM}s$. But, the results was resulted to lost its magnetism in higher temperature than $150^{\circ}C$/10 minute. Conclusion: The measured ISQ values showed insignificant differences in case of no changes in the magnetism of the $Smartpeg^{TM}s$. It seems that the $Smartpeg^{TM}s$ can be used repeatedly in every measurement if the original magnetisms of the $Smartpeg^{TM}s$ can be recognized. There seems to be no significant changes in the measured ISQ values of 'attach-detach $Smartpeg^{TM}s'$ only if the screw pitches were unimpaired. The clinical sterilization methods seems acceptable because the result was resulted to lost its magnetism in higher temperature than $150^{\circ}C$/10minute.

• Journal of Dental Rehabilitation and Applied Science
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• v.31 no.4
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• pp.316-328
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• 2015

Purpose: The objects of this study was to evaluate the accuracy of the dental stone casts made from alginate impressions according to storage condition and stone pouring time. Materials and Methods: Each of upper and lower impressions of dental model was taken. The dental stone models were made immediately, 10, 30, 60, 180, 360 minutes after the impressions were taken at each storage condition. 3D models were constructed by scanning the stone model using 3D laser scanner. With Reference points, positioned on digital models, linear measurements of the dimensional change were compared by 3D metrology software, 3D average models were made and superimposition to identify the specific site of dimensional change and to measure surface deviation (mm). Results: Dental stone models which were made immediately after taking the impression showed the smallest linear dimensional change. As the stone pouring time was prolonged, the linear dimensional change was increased. More than 180 minutes after impression taking, linear dimensional change and surface distortion increased in the posterior molar region, regardless of the storage condition. Conclusion: For the optimum accuracy of the dental stone casts, alginate impression should be poured as soon as possible. If there were a need for storing, a humidor with 100% relative humidity must be used and be stored less than 180 minutes to fabricate the accurate dental model.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.4
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• pp.917-924
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• 2012

This study was attempted in order to grasp the influence of smoking upon periodontal disease by analyzing relationship between the smoking realities and the periodontal disease risk in adults aged over 19 in our country. In the findings, the mean in CPI of the whole subjects was 1.92. Among 6989 whole subjects, the group whose CPI is 0-2 included 4707 people(67.3%). The group whose CPI is 3-4 included 2282 people(32.7%). As for the group whose CPI is more than 3 when confounder wasn't corrected, the risk on incidence of periodontal disease in the group with smoking in the past increased by 1.78 times(95% CI:1.56-2.02), compared to the group with no smoking. In the group with the current smoking, it increased by 1.75 times(95% CI:1.55-1.82). Even with correcting gender, age, educational level, and diabetes appearance, the risk on incidence of periodontal disease was higher by 1.28 times(95% CI:1.08-1.53) in the group with smoking in the past and by 1.82 times(95% CI:1.54-2.16) in the group with the current smoking than the group without smoking at all. Accordingly, smoking was indicated to be related to periodontal disease. Thus, the positive publicity needs to allow patients themselves to establish firm consciousness. In addition, dental hygienists need to perform systematic non-smoking educational guidance within doctor's office. Thus, it is thought to necessarily contribute to improving periodontal health.

• Restorative Dentistry and Endodontics
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• v.33 no.6
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• pp.560-569
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• 2008

Microorganism survived in the root canal after root canal cleaning and shaping procedure is a main cause of root canal treatment failure. There are several mechanisms for the bacteria to survive in the root canal after chemomechanical preparation and root canal irrigation. Bacteria organized as biofilm has been suggested as an etiology of persistent periapical lesion. Recent studies were focus on removal of Enterococcus faecalis biofilm due to the report that the persistence of this bacteria after root canal treatment may be associated with its ability to form biofilm. Several investigations demonstrated that current root canal treatment protocol including use of NaOCl, EDTA and Chlorhexidine as irrigants is quite effective in eliminating E. faecalis biofilm. However, this microorganism still can survive in inaccessible areas of root canal system and evade host immune response, suppress immune activity and produce biofilm. Up to date, there is no possible clinical method to completely get rid of bacteria from the root canal. Once the root canal treatment failure occurred, and conventional treatment incorporating current therapeutic protocol has failed, periapical surgery or extraction should be considered rather than prolong the in effected retreatment procedure.

• Journal of Oral Medicine and Pain
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• v.22 no.1
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• pp.31-44
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• 1997

저자들은 악관절내장증의 증상과 징후의 객관적 평가법을 개발하기 위하여 서울대학교치과 병원 구강진단과 악안면동통진료실을 내원한 환자중 좌우 양 관절중 한 관절 이상의 관절에 악관절내장이 있는 남자 8명(평균연령 19.9$\pm$2.9세), 여자 34명(평균연령:32.8$\pm$11.8세) 총 42명(84개 관절)에 대하여 VAS 및 압통역치 측정, 악관절조영술, 골신티그래피 검사 및 악관절 활액의 분석을 시행하였다. 악관절 동통의 심도는 VAS로 측정을 하였으며 PPT는 electronic algometer로 평가를 하였다. 악관절조영사진을 얻기 직전 활액을 채취하였으며 그 성분중 Hyaluronic acid, 총단백질, IgG, IgM과 albumin을 분석하여 그 상관관계를 분석한 결과 다음과 같은 결론을 얻었다. 1. 악관절 내장증으로 내원한 환자 42명, 총 84개 관절중, 무통성이고 관절잡음이 없는 경우가 7개 관절, 무통성이고 단순관절음만 존재하는 경우가 18개 관절, 동통 및 단순관절음이 존재하는 경우가 18개 관절, 간헐적인 폐구 과두걸림이 있는 경우가 11개 관절, 급성 폐구성 과두걸림의 경우가 11개 관절, 만성 폐구성 과두걸림의 경우가 3개 관절, 퇴행성 관절질환이 존재하는 경우가 16개 관절이었다. 2. 연구대상중 18명의 환자, 총 36개 관절에 대한 골 신티그래피 검사 결과, 활동성으로 나타난 경우가 33개 관절이었고 이중 23개 관절이 동통성이었으며, 활동 상태 관절의 VAS 항목과 압통역치 항목 및 여러 검사 항목들은 비활동 상태 관절의 항목과 유의한 차이를 나타내지 않았다. 3. 악관절내장의 진행정도에 따른 악관절부위의 동통의 측정에 있어서는 압통역치의 측정보다는 VAS에 의한 방법이 더 유용하며 특히, 후방부의 촉진시에 유의한 정보를 얻을 수 있었다. 4. 악관절 내장즈으이 진행 단계에 따라, VAS항목과 압통역치 항목을 비교해 본 결고, 주기적인 과두걸림(II) 단계에서 가장 높은 VAS 수치와 가장 낮은 압통역치를 나타내었으며 상방 촉진시 VAS 항목에서 주기적인 과두걸림(II) 단계와 증상 및 징후가 없는(0) 단계 사이와 후방 촉진시 VAS 항목에서 주기적인 과두걸림(II) 단계 및 퇴행성 관절 질환(V) 단계와 증상 및 징후가 없는(0) 단계 사이에서만 유의성을 나타내었다. 5. 활액내 총단백질량, albumin 량, IgG 및 IgM 농도는 악과？ㄹ 내장증의 진행에 따라 유의성을 나타내지는 않았으나 퇴행성 관절 질환(V) 단계에서 증가되는 양상을 나타내었다. 6. 활액내 hyaluronic acid의 농도는 악관절 내장증의 진행에 따라 유의성을 나타내지는 않았으나 만성 폐구성 과두걸림(IV) 단계에서 감소되는 양상을 나타내었다.

• The korean journal of orthodontics
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• v.28 no.2 s.67
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• pp.329-341
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• 1998

Sterilization has received much attention in orthodontic practices over the past several years. The present study was undertaken to investigate the effects of sterilization on the physical properties of orthodontic pliers-AEZ, Unitek, and Dentronix ligature cutters. This study was designed to examine the tips of ligature cutters before and after 200 and 400 sterilization cycles using the Bowmar RHT-1000, the Dentronix DDS-5000, and the Eschmann SES-2000. The tip surface and the fracture surface were observed with a scanning electron microscope. The microstructure was observed with an optical microscope. The hardness test was carried out with the mic개-Vickers hardness tester and the Rockwell C Scale hardness tester. The chemical composition was analyzed by energy dispersive X-ray spectrometer. The results of this study were as follows : 1. The number and the size of corrosion products on the tip surface and the proportion of cleavage planes in fractured specimen increased, but the hardness of the tip decreased in proportion to sterilization cycles. From these observations, it was considered that mechanical properities decreased in proportion to sterilization cycles. 2. The number and the size of chromium carbides increased in proportion to sterilization cycles. Coarse microstructure decreased mechanical properities. 3. The AEZ and Unitek ligature cutters were Fe-Cr stainless steels, but the Dentronix ligature cutter was Co-Cr alloy. There were many differences among manufactures, but the chemical composition was .not changed after sterilization cycles. 4. The tip edge of ligature cutter used in a clinic revealed microcracks with the SEM observation. Clinical experience confirmed that ligature cutters were gradually degraded by sterilization.

• Journal of Oral Medicine and Pain
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• v.34 no.4
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• pp.397-407
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• 2009

The aim of the study was to evaluate psychosocial impact of non-dental chronic orofacial pain (OFP) on daily living using the graded chronic pain (GCP) scale. It is also investigated the clinical profile such as demographics, event related to initiation of OFP and prior treatments for patients. During previous 6 months since September 2008, 572 patients (M:F=1:1.5, mean age=34.7 years) with non-dental OFP attended university-based specialist orofacial pain clinic (Dankook University Dental Hospital, Cheonan) to seek care although 63% of them already experienced related treatment for their OFP problem. They visited the most frequently general dental practitioner and orthopedic doctors due to their pain problem and medication was the most commonly employed modality. Most of the patients (89.2%) had TMD and the most common related event to initiation of their pain was trauma, followed by dental treatment. Almost half of the patients (46%) suffered from chronic pain(${\geq}6\;M$) and 40% of them exhibited relatively high disability due to chronic OFP. GCP pain intensity and disability days were significantly different for age and diagnosis (p<0.05) but not for gender and duration. GCP grades were affected by all the factors including gender, age, pain duration and diagnosis.(p=0.000) Female gender, elders, and long lasting pain were closely related to high disability. The patients with neuropathic Pain and mixed OFP rather than TMD were graded as being highly disabled. Conclusively, a considerable percentage of chronic OFP patients reports high pain-related disability in their daily, social and work activity, which suggest a need for psychosocial support and importance of earlier referral for appropriate diagnosis and tailored management.

• Journal of Oral Medicine and Pain
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• v.34 no.2
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• pp.217-225
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• 2009

As Pain is a comprehensive, biopsy chosocial phenomenon, improved understanding and successful management of pain need assessment of health-related quality of life and psychological states. The purpose of this study was to evaluate pain severity and pain-related interference to daily lives for patients with non-dental, orofacial pain(OFP) and a possible relation of OFP with psychological morbidity. Relation with such factors as gender, age, pain duration and diagnosis was also assessed. Inclusion criteria was all new patients with non-dental OFP attending the oral medicine.orofacial pain clinic of Dankook University Dental Hospital over 3 months' period, who completed the questionnaires of the Brief Pain Inventory (BPI) and Hospital Anxiety and Depression Scale (HADS). Prior to the first consultation, the patients were asked to fill out the questionnaire in the waiting room and were diagnosed through consultation and clinical examination. Total subjects were 163 with M:F ratio of 1:1.5 and mean age of 34.6${\pm}$17.7 years. Mean duration of pain was 13.3${\pm}$26.2 months and all patients were divided into; Trigeminal Neuralgia group (TN, N=8), Neuropathic Pain group (NeP, N=9), Persistent Idiopathic Facial Pain group (PIFP, N=8), and Temporomandibular Disorders group (TMD, N=138), subdivided into muscle problem (TMD-m, N=73), joint problem (TMD-j, N=24) and muscle-joint combined problem (TMD-c, N=41). OFP patients showed moderate pain severity and moderate pain-related interference. There was no gender difference in overall pain severity and interference and levels of anxiety and depression. Elderly patients aged ${\geq}$ 60 years showed higher pain severity (p<0.05). Patients with chronic pain ${\geq}$ 3 months reported more increased level of anxiety and depression than those with acute pain (p<0.05). Compared to TMD patients, patients with TN, NeP and PIFP suffered from higher level of pain and pain-related interference and reported higher level of anxiety and depression (p<0.05). Pain interference was closely correlated with their pain severity and with psychometric properties such as anxiety and depression. Pain severity was weakly correlated with levels of anxiety and depression. The results suggest a need for psychosocial assessment and support for successful management of OFP in addition to control of pain itself.