• 구강회복응용과학지
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• 제17권4호
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• pp.257-274
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• 2001

To properly prepare teeth, dentists require a direct view of the working area and are often placed in a difficult position, moreover, a high proportion of dentists suffer from headache and back pain. Dentists who make use of the dental mirror and position their patients carefully to gain a proper view report less headache, pain and discomfort in the shoulders. It is recommended that dentists learn the "Home Position(H.P.)" which among the various "Random Position(R.P.)" methods, enables dentists to approach their patients in a stable posture. The purpose of this study was to compare tooth preparation in the H.P. and the R.P., and evaluate the clinical efficacy of the H.P.. Tooth preparation for a full cast crown was performed on the maxillary left 1st molar using the H.P. and the R.P., and the shapes of the prepared tooth surfaces at the two different operating positions were compared. The amount of occlusal reduction, marginal width, height, and axial taper were measured and analyzed. A T-test was performed separately to compare the results of the H.P. and the R.P. with respect to the accuracy of the corresponding tooth reduction. The results were as follows. ; 1. The amount of occlusal reduction was excessive on the mesiobuccal cusp(P<0.05), and deficient on the lingual cusp in the H.P.(P<0.01). In the R.P., this was excessive on the buccal cusp and deficient on the fossa and distolingual cusp(P<0.01). 2. The amounts of marginal width were excessive in all areas except on the lingual and mesial surfaces in the H.P. and lingual surface in the R.P.(P<0.01). 3. The marginal heights were achieved more accurately in the R.P. than the H.P.(P<0.01). 4. Axial surface taper was excessive in all areas in the H.P.(P<0.01). But the axial taper of measured areas was even, and tooth is more like to retain its original axis after reduction. In the R.P., axial surface taper was excessive on the mesial and buccal area, and deficient on the distolingual area(P<0.01), and therefore, the axis of the prepared teeth was tipped in the distolingual direction. 5. The times needed for preparation were 12 minutes and 49 seconds in the H.P., and 11 minutes and 35 seconds in the R.P., and the R.P. was statistically faster(P<0.01). The tooth preparation in the H.P. achieved its goal, in that it enabled the operator to make even tooth reduction. In conclusion, the H.P. system offers an improved method that can be used in clinic after specific training.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제30권6호
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• pp.455-464
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• 2004

The purpose of this study was to evaluate and compare the influence of Steroid topical irrigation and implant surface on bone healing in the irradiated rabbit tibia. Implant to bone contact surface ratio and the pattern of bone healing around hydroxyapatite(HA) coated implant and pure titanium (Ti) implant which were inserted into the irradiated rabbit tibia were compared. 16 Korean house mature male rabbits were used as experimental animal. Each rabbit received 15 Gy of irradiation. 4 weeks after the irradiation, two holes were prepared in the irradiated tibia of each rabbits, where two surface type of implants were inserted :1) HA coated type and 2) pure Ti type. Right before placing implants, one group of rabbit received steroid irrigation and the other group did saline. After the irrigation, two implants of HA coated type and pure Ti type were inserted into the tibia of each rabbits. Each rabbit were sacrificed at 2nd, 4th, and 8th week after the implantation and the specimens were observed by the light microscope. The pattern of bone healing and histomorphometric analysis of the implant-bone interface were done. The results were as follows. 1. All implants inserted into the irradiated tibia of rabbit did not show any sign of clinical mobility and the bone around implants inserted into the irradiated tibia of rabbit did not show any resorption. 2. The bone to implant contact surface ratio around HA coated implants that received steroid irrigation got more bone to implant contact surface ratio than that of the saline irrigation. This result showed statistically significant(p<0.05). There was no statistically significant difference in 8th week group. 3. Though there was no statistically significant difference HA coated implants had more bone to implant contact surface ratio than pure Ti implant in 2nd and 4th groups, and there was no difference in 8th week group. 4. All implants inserted into the irradiated tibia of rabbit had exhibited successful osseointegraion.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제30권6호
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• pp.504-508
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• 2004

Surgical process of oral and maxillofacial area as well as dental treatment are stressful situations to the patients. It is well known that serum level of stress hormones including adrenocorticotropic hormone(ACTH) and cortisol increase when the body is exposed to stress. However, there have been few studies on demographic and clinical factors related with stress. Therefore, the purpose of this study was to supply data to cope with stress more comprehensively and efficiently by analyzing the effect of factors related with stress in addition to surgical procedure. Prospective cohort study method was selected. Serum levels of ACTH and cortisol were measured by sampling bloods pre-operatively and post-operatively from 45 patients who had been operated at the Bundang Jesaeng Hospital department of oral and maxillofacial surgery. To evaluate factors associated with stress, patients were classified according to gender, age, method of payment(insurance or self), experiences of operation, kind of operations(expected operations or unexpected operations). Relative risk was calculated to assess relationships between changes of serum level of ACTH and cortisol and factors related with stress, whereas Chi-square analysis was executed to evaluate statistical significance. With regard to serum level of ACTH, relative risk was 1.3 in the group of the patients who were less than 40 years old. With regard to serum level of cortisol, relative risk was 1.8 for women compared with men, 1.4 in the group of the patients who were less than 40 years old and 1.6 in the group of the patients who had not experienced any other operations. In addition to surgical procedure, factors related with stress included gender, age, method of payments, experiences of operation and kind of operations. Therefore, we should provide comprehensive schemes to reduce stress of the patients going through oral and maxillofacial surgery.

• 한국산학기술학회논문지
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• 제20권11호
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• pp.273-281
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• 2019

본 연구는 성인 남성의 흡연 영향요인, 흡연이 구강건강과 삶의 질에 미치는 영향을 분석하고 치과의료기관의 금연지원 필요성을 제안하고자 하였다. 연구는 2018년 10-12월 기간 중 J시 치과의료기관에 내원한 흡연경험이 있는 성인 남성 165명을 대상으로 흡연영향요인, 흡연이 구강건강에 미치는 영향에 관한 지식, 구강건강 관련 삶의 질, 치과 금연지원 인식을 자기기입식 설문조사하였다. 분석은 SPSS18.0 통계 프로그램을 이용하였다. 흡연집단은 스트레스지수가 13.0으로 비흡연집단 9.97보다 높았고 음주회수가 주 2회 이상으로 비흡연자 0.96회보다 높았으며(p<0.05) 구강보건지식은 상대적으로 낮았다(p>0.05). 흡연은 스트레스(r= .283, p<0.001)와 구강건강관련 삶의 질(r= -.263, p<0.001)과 유의한 상관관계가 있었다. 국가 금연지원 서비스 인식은 32.9 % 이었으나 금연서비스 경험은 19.4 %로 이용율이 낮았다. 치과의료기관의 금연 지원은 65.5 %가 긍정적으로 응답하여 치과금연서비스 이용의 증가를 기대할 수 있었다. 흡연자의 금연지원을 위해 스트레스와 음주 조절 및 구강건강 영향에 대한 교육이 필요하고, 금연서비스 이용을 높이기 위한 금연정책으로 구강보건전문가들의 금연지원 활성화가 요구되었다

• Toxicological Research
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• 제34권2호
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• pp.173-182
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• 2018

Valproic acid (VPA) plays a role in histone modifications that eventually inhibit the activity of histone deacetylase (HDAC), and will affect the expressions of genes Pdx1, Nkx6.1, and Ngn3 during pancreatic organogenesis. This experiment was designed to study the effect of VPA exposure in pregnant rats on the activity of HDAC that controls the expression of genes regulating the development of beta cells in the pancreas to synthesize and secrete insulin. This study used 30 pregnant Sprague-Dawley rats, divided into 4 groups, as follows: (1) a control group of pregnant rats without VPA administration, (2) pregnant rats administered with 250 mg VPA on day 10 of pregnancy, (3) pregnant rats administered with 250 mg VPA on day 13 of pregnancy, and (4) pregnant rats administered with 250 mg VPA on day 16 of pregnancy. Eighty-four newborn rats born to control rats and rats administered with VPA on days 10, 13, and 16 of pregnancy were used to measure serum glucose, insulin, DNA, RNA, and ratio of RNA/DNA concentrations in the pancreas and to observe the microscopical condition of the pancreas at the ages of 4 to 32 weeks postpartum with 4-week intervals. The results showed that at the age of 32 weeks, the offspring of pregnant rats administered with 250 mg VPA on days 10, 13, and 16 of pregnancy had higher serum glucose concentrations and lower serum insulin concentrations, followed by decreased concentrations of RNA, and the ratio of RNA/DNA in the pancreas. Microscopical observations showed that the pancreas of the rats born to pregnant rats administered with VPA during pregnancy had low immunoreaction to insulin. The exposure of pregnant rats to VPA during pregnancy disturbs organogenesis of the pancreas of the embryos that eventually disturb the insulin production in the beta cells indicated by the decreased insulin secretion during postnatal life.

• 한국치위생학회지
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• 제8권1호
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• pp.93-105
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• 2008

In order to provide basic information to help dental medical service with supplying gratifying service for patients. the survey is conducted on the patients who frequently visited dental clinics located in the areas such as Seoul, Kyoungi, and Incheon from May of 2006 to June. The survey results are as following : 1. Judged from the factors to make patients choose one dental clinic over another. the low cost of treatment accounts for 32.8%. and followed by physician's academic background / career experiences with 20.5%. In case of recommending to their acquaintances, physician's proficiency in treatment is ranked high as 56.7%. 2. For most desirable facilities for dental hospitals. the results indicate that cutting-edge medical equipment holds 46.7% and followed by a comfortable waiting room with 32.8%. 3. Examined the questions of what patients are most satisfied with dental clinics. 43.1% of respondents point out kind and detailed explanation. 14.1% also responds to constant care after the treatment. This result suggests that after-care and detailed explanation also play an important role in dental care as well as the treatment itself. 4. For desirable services in the waiting room. 28.5% of the respondents choose a selection of magazines and newspaper and 18.7% say that they want to converse with the staff. As to how long can wait with patience. 38.2% of the participants agree on as long as 20 minutes. 5. Among unsatisfactory sources against dental clinics while visiting, the high cost of the treatment is scored high as 34.1% and followed by a long waiting time with 22.1%. The figure points to the fact that dental medical clinics should consider these two factors to solve in the future. In case where patients find the treatment discontent and they are asked what to do, 36.4% of the respondents respond that they go to a different hospital without saying anything. As to the enquiry about how the complains should be dealt, 46.% wishes that the matter should be taken care immediately upon complaining, 21.8% suggests that they like to feel understood and acceptable when presenting complaints.

• 대한치과교정학회지
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• 제31권4호
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• pp.393-401
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• 2001

교정치료의 결과를 평가하는 방법에는 두부방사선계측이나 석고모형을 이용하는 방법등이 있다. 교합지수는 석고 모형을 이용한 평가방법 중 하나로, 교합 상태를 하나의 수치로 표현하기 때문에 정량적으로 평가할 수 있고 계측이 객관적이며 교정치료의 결과를 평가하는데 있어서 표준화가 가능하다는 장점이 있다. 이 연구는 PAR지수를 이용하여 경희대학교 치과대학 교정과에서 시행되는 교정치료의 결과를 평가하고, 교정치료 증례들의 교정치료 전과 추적 관찰기의 교합 변화를 평가하며, 교정치료 전후의 결과가 치료 전 증례의 Angle 분류와 상관성이 있는지를 평가하기 위해 시행되었다. 영구치열기에 교정치료를 시작하여 고정식 교정장치로 치료하였고, 교정장치를 제거한 후 최소 24개월이 경과한 I급 부정교합 9 증례, II급 1류 부정교합 8 증례, III급 부정교합 8 증례 등 총 25 증례의 교정치료 전, 교정치료 종료 시, 추적 관찰기의 석고모형을 대상으로 PAR (Peer Assessment Rating) 지수를 이용한 교정치료의 결과 및 재발에 관한 연구를 시행하여 다음의 결론을 얻었다. 1. 교정치료 종료 시 평균 85.05%의 가중된 PAR 점수의 개선을 보였으며, 이는 'high standard of treatment'에 해당된다. 2. 추적 관찰기에는 교정치료 전과 비교하여 평균 75.40%의 가중된 PAR점수 개선을 보였으며 교정치료 종료 시와 비교하여 추적 관찰 기간동안 9.65%의 가중된 PAR 점수의 증가가 있었다. 3. 교정치료 전 Angle 분류와 치료 전후의 PAR 지수 변화량 간에는 상관관계가 없었다.

• Journal of Oral Medicine and Pain
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• 제33권2호
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• pp.167-176
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• 2008

2000년 1월부터 2007년 12월까지 전북대학교병원 치과진료처 구강내과에 의뢰된 연령추정 121례를 분석 및 평가하여 다음과 같은 결론을 얻었다. 1. 연령추정 의뢰인의 성별 분포는 남성(58.7%)이 여성(41.3%)보다 많았으며, 연령별로는 50대 이상이 전체의 과반수(55.4%)를 차지하였다. 2. 호적 연령과 주장 연령의 차이는 5세 이상(34.1%) 차이가 가장 많았고, 이는 50대 이상이 대부분이었다. 3. 연령을 늘리려는 의뢰인(64.2%)이 줄이려는 의뢰인(35.8%)보다 많았으며, 이는 남녀 모두 유사하게 나타났다. 10세 미만과 20대는 나이를 줄이려는 경우가, 10대, 30대이상에서는 나이를 늘리려는 경우가 많았다. 4. 복지를 이유로 연령정정을 원하는 경우가 가장 많았다. 복지혜택과 관련해서는 50대 이상이, 직장과 관련해서는 40대와 50대가, 교우관계와 관련해서는 30대와 40대가, 가족 관계와 관련해서는 50대가, 취업과 관련해서는 10대와 20대가 가장 많았다. 5. 연령추정 방법은 20세 이상에서는 영구치의 교모도와 치수강 퇴축도를 사용하였으며, 10세 이상 20세 미만에서는 치근단공 폐쇄시기를, 10세 미만에서는 영구치 석회화 정도를 각각 사용하였다. 20세 이상에서 영구치 교모도와 치수강 퇴축도를 사용하기 어려운 경우, 영구치의 상실시기와 하악각의 증령적 변화를 이용하여 연령을 추정하였다. 6. 각 방법에 의해 추정된 연령의 77.7%는 의뢰인이 주장하는 연령에 근접하였으나, 22.3%는 호적상의 연령에 근접하여 의뢰인의 주장과 일치하지 않았다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제26권4호
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• pp.373-382
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• 2000

Temporomandibular disorders arised from joint itself was caused by inflammation or mechanical irritation of the retrodiskal tissues. Histologic changes of the retrodiskal tissues of temporomandibular joint(TMJ) internal derangement, such as inflammatory cell infiltration, hyalinization, myxoid change, fatty change, arterial obliteration, and so on, were reported, but relationships between magnetic resonance imaging(MRI) findings and histologic findings of the retrodiskal tissue were few reported. The purpose of this study was to find histologic changes of the retrodiskal tissues for status of joint and joint effusion in MRI of the temporomandibular joint which had surgical treatment. Materials were surgically treated 52 temporomandibular joints with internal derangement or osteoarthritis in TMJ clinic, Yongdong Severance Hospital. All joints were confirmed by magnetic resonance T1- and T2-weighted imagings bofere surgery. Status of joint was categorized by normal position, disc displacement with reduction, disc displacement without reduction, disc displacement without reduction associated with osteoarthrosis using preoperative MR T1-weighted images. Magnetic resonance evidence of joint effusion was observed in T2-weighted images and classified by its amount; degree 0(not observed), degree 1(small amount), degree 2(moderate amount), degree 3(large amount). Histologic features were observed whether the retrodiskal tissue has inflammatory cell infiltration, myxoid change, hyalinization, chondroid metaplasia and arterial obliteration. The distribution of elastic fibers were also observed. The results were as follows; 1. Inflammatory cell infiltration was not observed in any retrodiskal tissues. 2. MRI findings such as status of joint and evidence of joint effusion did not have significant relationship with myxoid change, hyalinization, chondroid metaplasia, arterial obliteration of the retrodiskal tissues. 3. Hyalinization and chondroid metaplasia were found in 8 joints(15.4%) and 5 joints(9.6%). All of them were found in disc displacement without reduction and disc displacement without reduction associated with osteoarthrosis. 4. Arterial obliteration was observed more frequently in disc displacement without reduction(55.6%) than disc displacement without reduction associated with osteoarthrosis(28.6%). Further studies with proper controls and more materials will be necessary.

• 대한치과교정학회지
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• 제32권2호통권91호
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• pp.91-105
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• 2002

일반적으로 교정 환자의 문제점을 파악하고 치료 계획을 수립할 때에 여러 분석법의 정상치를 기준으로 하는 경우가 많다. 하지만 다양한 악골관계 하에서 정상적인 악궁관계를 유지하기 위해 3차원적으로 발생하는 치아치조부 보상 기전을 고려한다면 좀 더 개별화된 치료 목표와 치료계획을 수립하는데 도움이 될 수 있을 것이다. 이에 본 연구에서는 정상교합자 125명의 측모 두부계측방사선사진을 계측하여 정상교합자의 골격양상의 다양성을 살펴보았다. 또한 여러 골격계측 기준을 이용한 군집분석을 적용하여 정상교합자의 골격형을 전후방으로 세 군, 수직적으로 세 군으로 분류하고 각 골격형에 따른 치아치조부 보상양상을 조사하여 다음과 같은 결과를 얻었다. 1. 정상교합자의 전후방적, 수직적 악골관계는 매우 다양하였다. 2. 하악골이 상악골에 비해 전방 위치할수록 상악 전치는 순측으로 경사 되고 하악 전치는 설측으로 경사 되며 교합평면의 경사도는 완만해졌다. 3. 수직적인 골격양상일수록 상악 전치부의 치아치조 고경이 증가하고, 하악 구치부의 치아치조 고경이 감소하였으며 구개평면에 대한 상악 구치와 하악평면에 대한 하악 전치 및 하악 구치는 직립 하였고 교합평면과 하악평면사이의 각(OMA)은 증가하였다. 4. 상악 전치보다 하악 전치에서 전후방 및 수직적인 악골관계에 대해 더 많은 치아치조부 보상양상을 보였다.