• 대한구강악안면임플란트학회지
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• 제22권4호
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• pp.220-235
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• 2018

Sinus lift procedure is frequently required for the maxillary molar implant placement. Previous studies have demonstrated alveolar ridge preservation (ARP) can maintain the dimensions of ridge height and width. However, there is a lack of studies which evaluated the effect of ARP to avoid sinus lift procedure. Purpose of this study is to describe a method reducing the need of sinus lift surgery by ARP in maxillary molar areas and to assess the feasibility clinically, radiologically and histologically. Ten maxillary molars in ten patients had severe vertical bone resorption with minimal residual bone height. They were considered having the high possibility of the necessity of sinus lift procedure for dental implant after the extraction. After extraction, open healing ARP with deproteinized bovine bone mineral mixed with 10% collagen and resorbable collagen membranes was performed. After sufficient healing, dental implants were placed, and evaluated clinically and radiologically. Histological observation was conducted just before the implantation in one patient. Implants were successfully placed without sinus lift in all ten cases. All the implants were restored with no sign of complications, and patients are now in a close follow-up up to 20 months post-loading. Histological observation showed minimal inflammatory reaction and newly formed bone was substantially noted. The ARP technique has successfully avoided the sinus lift surgeries. It appears that this procedure may improve the simplicity of the clinical process for the clinicians and reduce the discomfort of patients.

• 대한치과기공학회지
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• 제31권1호
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• pp.55-61
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• 2009

Passive fitting of meso-structure and super-structures is a predominant requirement for the longevity and clinical success of osseointegrated dental implants. However, precision and passive fitting has been unpredictable with conventional methods of casting as well as for corrective techniques. Alternative to conventional techniques, electro discharge machining(EDM) is an advanced method introduced to dental technology to improve the passive fitting of implant prosthesis. In this technique material is removed by melting and vaporization in electric sparks. Regarding the efficacy of EDM, the application of this technique induces severe surface morphological and elemental alterations due to the high temperatures developed during machining, which vary between $10,000{\sim}20,000^{\circ}C$. The aim of this study was to investigate the morphological and elemental alterations induced by EDM process of casting dental gold alloy and non-precious alloy used for the production of implant-supported prosthesis. A conventional clinical dental casting alloys were used for experimental specimens patterns, which were divided in three groups, high fineness gold alloy(Au 75%, HG group), low fineness gold alloy(Au 55%, LG group) and nonprecious metal alloy(Ni-Cr, NP group). The UCLA type plastic abutment patterns were invested with conventional investment material and were cast in a centrifugal casting machine. Castings were sandblasted with $50{\mu}m\;Al_2O_3$. One casting specimen of each group was polished by conventional finishing(HGCON, LGCON, NPCON) and one specimen of each group was subjected to EDM in a system using Cu electrodes, kerosene as dielectric fluid in 10 min for gold alloy and 20 min for Ni-Cr alloy(HGEDM. LGEDM, NOEDM). The surface morphology of all specimens was studied under an energy dispersive X-ray spectrometer (EDS). The quantitative results from EDS analysis are presented on the HGEDM and LGEDM specimens a significant increase in C and Cu concentrations was found after EDM finishing. The different result was documented for C on the NPEDM with a significant uptake of O after EDM finishing, whereas Al, Si showed a significant decrease in their concentrations. EDS analysis showed a serious uptake of C and Cu after the EDM procedure in the alloys studied. The C uptake after the EDM process is a common finding and it is attributed to the decomposition of the dielectric fluid in the plasma column, probably due to the development of extremely high temperatures. The Cu uptake is readily explained from the decomposition of Cu electrodes, something which is also a common finding after the EDM procedure. However, all the aforementioned mechanisms require further research. The clinical implication of these findings is related with the biological and corrosion resistance of surfaces prepared by the EDM process.

• 대한장애인치과학회지
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• 제14권1호
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• pp.36-40
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• 2018

CATCH 22 증후군(CATCH 22 Syndrome)은 선천성 심장기형, 비정상적인 안모, 흉선 형성부전, 구개열, 저칼슘혈증을 특징으로 하나 임상양상은 다양하게 나타난다. 본 증례는 치과 검진에 비협조적이고 다수의 치아 우식을 보이는 4세 5개월의 CATCH 22 증후군 환자를 전신마취 하에 효과적으로 치료하였기에 이를 보고하는 바이다. CATCH 22 증후군 환아는 선천적 심장기형을 동반하는 경우가 많아 의과적 자문 하에 치과 치료를 시행해야 한다. 간단한 치료의 경우 의과적 자문 하에 진정법 시행을 고려해 볼 수 있으나 불안정한 생징후를 보일 수 있어 보다 면밀한 모니터링을 요한다. CATCH22 환아의 전신상태에 대한 충분한 이해 및 술전 평가를 바탕으로 한 주의깊게 시행된 전신마취 술식은 다발성 치아우식의 치료에 있어서 보다 안전하고 효과적인 방법이 될 수 있을 것으로 사료된다.

• 대한치과보철학회지
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• 제46권1호
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• pp.83-91
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• 2008

문제제기 : 2007년 4월 '노인장기요양보험법'이 국회를 통과하였고 노인수발행위에 치과의사의 참여가 확정되어 2008년 7월부터 법이 시행되면서, 고령화가 급속이 진행되고 있는 한국사회에서 치과분야가 담당해야 할 역할은 커질 수밖에 없다. 목적 : 본 논문은 한국의 두 노인시설에 대한 설문조사를 바탕으로 일본의 노인요양보험법과 비교를 통해 앞으로 시행되는 노인장기요양법의 구강위생서비스의 역할 및 방향을 수립하는데 기여하고자 한다. 연구재료 및 방법 : 2005년 한국의 두 노인요양시설에서 책임 있는 직무자 또는 실제 간호의 내용을 파악하고 있는 분을 대상으로 15개 항목의 설문조사를 시행하였다. 결과 : 두 시설 모두 각각의 특징을 살려 매우 기능을 잘 하고 있었으나, 구강위생 및 이에 대한 직원의 인지도는 낮았으며 정기적인 진료나 관리는 소홀했다. 고찰 : 일본에서는 2000년 노인요양보험이 도입 후 체계화된 방법론을 기초로 시행되고 있다. 현재 '노인장기요양' 법안에 치과의사 참여가 보장된 것과 관련하여 앞으로 치과의사의 적극적인 참여가 필요하고, 시설 및 재택 방문 진료가 가능하도록 하는 법정비용을 통해 치과분야의 진료영역을 넓힐 수 있는 움직임이 필요하다고 볼 수 있다.

• 대한치과보철학회지
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• 제39권4호
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• pp.433-443
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• 2001

The aim of this study was to evaluate the dental specialty system from the viewpoint of korean constitution. An attempt to introduce a dental specialty system has been repeated many times, but it was interrupted by the dispute of the interested parties, especially general practice dentists, trained dentists and the authorites concerned. The korean constitutional court decided on July 16th 1998 that the lack of the examination to be a dental specialist was against the korean constitutional law and the authority concerned should prepare the legal procedure for the dental specialist examination in proper time. Though the dental specialty system may be discussed in a variety of view, it should be established on the ground of the korean constitutionalism. According to the korean constitution, all the people can develop their abilities at the maximum and have their dignity, preciousness and right to seek their happiness. With the view of spirits of the constitution, dental specialty system should be more open widely to those who want to be a specialist. It should be also allowed to the dental specialists that they reveal their specialty and creativity. However, the representatives of the korean dental association(KDA) decided at the 50th annual meeting that the dental specialists should not reveal or annonce their specialties at the first step of the dental care and all the present dentists give up to be specialists. As conclusion of this study the proposals of the KDA seems to be against the korean constitution and hardly fulfills the needs of the times.

• Journal of Dental Anesthesia and Pain Medicine
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• 제16권3호
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• pp.203-208
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• 2016

Background: In South Korea, the number of cases of dental treatment for the disabled is gradually increasing, primarily at regional dental clinics for the disabled. This study investigated pediatric patients at a treatment clinic for the disabled within a university hospital who received dental treatment under general anesthesia. This data could assist those that provide dental treatment for the disabled and guide future treatment directions and new policies. Methods: This study was a retrospective analysis of 263 cases in which patients received dental treatment under general anesthesia from January 2011 to May 2016. The variables examined were gender, age, reason for anesthesia, type of disability, time under anesthesia, duration of treatment, type of procedure, treatment details, and annual trends in the use of general anesthesia. Results: Among pediatric patients with disabilities who received dental treatment under general anesthesia, the most prevalent age group was 5-8 years old (124 patients, 47.1%), and the primary reason for administering anesthesia was dental anxiety or phobia. The mean time under anesthesia was $132.7{\pm}77.6min$, and the mean duration of treatment was $101.9{\pm}71.2min$. The most common type of treatment was restoration, accounting for 158 of the 380 treatments performed. Conclusions: Due to increasing demand, the number of cases of dental treatment performed under general anesthesia is expected to continue increasing, and it can be a useful method of treatment in patients with dental anxiety or phobia.

• 대한장애인치과학회지
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• 제6권2호
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• pp.77-83
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• 2010

This article discusses the issues of benefit and risk associated with outpatient general anesthesia and deep sedation for the special need dental patients. The purpose of administering anesthesia for patients with special needs is to provide effect dental treatment. But there are many complications such as sore throat, nausea and vomiting, airway trauma, airway obstruction and hypoxic brain damages, etc. In order to decrease incidence of complication, before general anesthesia meticulous patient evaluation is much important. But, there are a number of factors that make it difficult to accurately assess the anesthetic risk for many people with special needs. These include limited medical workups, uncooperative behavior, and difficulties in postoperative cares, etc. But Judging from several years experience of many contries, it appears that the incidence of mortalities for people with special needs in dental setting is minimal and the incidence of morbidity is limited. In the long run, the delivery of general anesthesia and deep sedation for people with special needs can be considered a very safe and successful procedure.

• Imaging Science in Dentistry
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• 제41권2호
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• pp.59-62
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• 2011

Purpose : This study was performed to evaluate the changes of jaw bone density around the dental implant after placement using computed tomography scan (CT-Scan). Materials and Methods : This retrospective study consisted of 30 patients who had lost 1 posterior tooth in maxilla or mandible and installed dental implant. The patients took CT-Scan before and after implant placement. Hounsfield Unit (HU) was measured around the implants and evaluated the difference of HU before and after implant installation. Results : The mean HU of jaw bone was 542.436 HU and 764.9 HU before and after implant placement, respectively (p<0.05). The means HUs for male were 632.3 HU and 932.2 HU and those for female 478.2 HU and 645.5 HU before and after implant placement, respectively (p<0.05). Also, the jaw bone with lower density needed longer period for implant procedure and the increased change of HU of jaw bone was less in the cases which needed longer period for osseointegration. Conclusion : CT-Scan could be used to assess the change of bone density around dental implants. Bone density around dental implant was increased after placement. The increased rate of bone density could be determined by the quality of jaw bone before implant placement.

• Restorative Dentistry and Endodontics
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• 제26권1호
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• pp.1-8
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• 2001

Dental Caries which has high prevalence rate, accounts for majority of dental diseases. Many treatment and preventive treatment has been developed, thereby reducing the prevalence rate, but in our country, fluoridization has not spread widely yet, so prevention has not been done satisfactorily. When dental caries progresses, irreversible damage of tooth structure occurs. In initial dental caries, demineralizing tooth structure can be remineralized, so restorative treatment is unnecessary. In this study, 20 teeth restored with composite resin without fluoride release were used and divided into two groups. Incipient dental caries were artificially made and demineralization procedure was done for 1 and 2 weeks, for each group. Changes in mineral contents around the margins were analysed with confocal laser scanning microscope. The results were as follow. 1. Both total fluorescence of the lesion and average fluorescence of the lesion of remineralized samples decreased compared to demineralizing state. (p＜0.01) 2. Confocal laser scanning microscopy can be used in quantitative analysis of mineral change. In result, confocal laser scanning microscopy can be used in quantitative analysis of mineral change and it could be used in many different fields of dentistry in the future.

• 대한치과마취과학회지
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• 제11권1호
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• pp.32-37
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• 2011

Pulsus paradoxus has been defined as a decrease in systolic blood pressure (SBP) of 10 mmHg or more during inspiration. This report describes pulsus paradoxus detected by pulse oximetry during dental procedure. Case: A 10 years old boy who had impacted mandibular premolar with malformation scheduled for extraction under intravenous sedation with Fentanyl and Propofol. The patient showed upper airway obstruction with stridor and pulsus paradoxus. Though pulsus paradoxus is generally critical condition, in this case, respiration and other vital sign was maintained comparatively well with care in administering oxygen and considerate monitoring of pulse oximetry and capnography. Discussion: Noninvasive continuous monitoring of pulse oximetry allows recognition of pulsus paradoxus which can lead to serious problems. Clinicians should know very well about it and be able to manage of this kind of situation.