• 대한치과보철학회지
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• 제30권2호
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• pp.203-224
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• 1992

The purpose of this study was to evaluate the stress distribution developed in supporting structures by distal extension removable partial denture with 4-types of direct retainer. The direct retainers examined were Akers clasp, RPI clasp, RPA clasp and RPL clasp in bilateral & unilateral free end case. 3-dimensional photoelastic stress analysis was used to record the isochromatic fringe patterns and to calculate the compressive stress at measuring points. The results were as follows. 1. In bilateral free end case, RPI clasp exhibited the similar stress distribution on distal and mesial alveolar crest but Akers clasp exhibited higher stress concentration on distal alveolar crest than mesial alveolar crest. 2. In bilateral free end case, RPA clasp and RPL clasp exhibited the similar stress distribution on distal and mesial alveolar crest and RPL clasp exhibited higher stress concentration on buccal alveolar crest than lingual alveolar crest. 3. Akers clasp produced high stress concentration on residual alveolar ridge distally, but RPI clasp, RPA clasp and RPL clasp produced even stress distribution on residual alveolar ridge. 4. Removable partial denture in unilateral free end case exerted higher stress on abutment tooth root apex than bilateral distal extension removable partial denture.

• The Journal of Advanced Prosthodontics
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• 제12권1호
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• pp.15-21
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• 2020

PURPOSE. The aim of the current study was to analyze treatment concepts of a cohort of German dentists for planning, fabrication, and maintenance of implant-supported fixed and removable restorations. MATERIALS AND METHODS. A questionnaire including queries about experiences with implant-supported restorations as well as prosthetic and maintenance treatment concepts for supplying patients with fixed and removable implant-supported prosthetic restorations was developed and sent to 350 dental offices registered in the municipal area of Leipzig, Germany. RESULTS. An overall total of 62 returned questionnaires were included in the analyses, which relates to a response rate of 17.7%. Participating dentists were more involved in the prosthetic aspects of implant dentistry rather than surgery, while prosthetic concepts such as backward planning, digital processing, and application of all-ceramic materials were not commonly performed. Simple attachments were preferred over complex retention systems in removable implant-supported restorations. Tooth/implant-supported fixed denture prostheses as well as removable denture prostheses with supporting posterior implants were not regarded as a favorable treatment option. CONCLUSION. Within the limitations of the study, the data indicate that dentists favor simple and conventional treatment approaches in implant prosthetics. Prosthetic aspects in the planning of implant-supported restorations are often neglected. Prosthetic treatment guidelines and aspects should commonly be considered in the planning phase of implant-supported prosthetic restorations, and awareness should be increased in postgraduate education.

• 구강회복응용과학지
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• 제30권2호
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• pp.152-158
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• 2014

저작기능의 회복과 더불어 환자에게 편안함을 제공하며 잔존치아와 치조점막을 건강하게 유지할 수 있는 가철성 국소의치 제작을 위해서는 구강내의 형태적, 기능적 상태를 재현하는 모형제작이 필수적이다. 국소의치 제작을 위해서는 진단모형과 주모형의 제작이 필요하며 이를 위해서 예비인상과 최종인상 채득 과정을 거치게 된다. 국소의치의 인상채득은 고정성이나 총의치 인상과 다르게 치아부위와 조직부위 모두가 잘 인기되어야 하고 치아 결손 부위에 따라 교합을 지지하는 부위가 달라지므로 증례에 따른 적절한 인상재와 인상채득 방법에 대한 이해를 바탕으로 정확한 임상적 적용이 요구된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.1330-1333
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• 2009

The soil nailing method had used in variable construction field because of construction convenience and reinforcement effect. Especially, the removal soil nailing method is useful support system in vertical excavation. In this study, to develop the wedge type removable soil nailing method for improvement of the removal soil nailing method. Because of the reinforcement materials is most important in soil nailing method, to evaluate the mechanical characteristics during laboratory strength test in this study. To conduct bond strength test of deformed bar combined with a wedged screw inside plastic fixed socket for evaluate the strength characteristics of wedge type removable soil nailing method and evaluate the strength characteristics of fixed socket based on laboratory tests.

• 구강회복응용과학지
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• 제37권1호
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• pp.39-47
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• 2021

의치의 금속구조물을 selective laser melting을 통하여 제작하는 경우 기존의 제작 방식에 비해 여러 기공 과정이 생략되어 시간이 절약되고 간편해진다. 또한 균질한 밀도의 금속구조물을 얻을 수 있어 우수한 기계적 성질, 특히 피로 파절에 대한 높은 저항성을 기대할 수 있다. 본 증례에서는 부분 무치악 환자에서 기존의 방식으로 최종인상을 채득하여 주모형을 제작하였고 이를 스캔하여 데이터화 하였다. 스캔 데이터 상에서 금속구조물을 디자인한 뒤 selective laser melting 방식으로 가철성 국소의치를 제작하였으며 기능적 및 심미적으로 만족스러운 결과를 보였기에 이를 보고하는 바이다.

• 구강회복응용과학지
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• 제32권1호
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• pp.80-86
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• 2016

잔존 지대치의 수가 적은 경우 이중관 가철성 국소의치를 사용한 여러 보고에서 우수한 결과가 나타남을 확인할 수 있다. 특히 치주 상태가 양호하지 않고 고립된 소수 잔존치를 지대치로 이용하여 국소의치로 수복해야 하는 경우에 프릭션핀을 이용한 하이브리드 텔레스코픽 이중관은 적절한 적응증이 될 수 있다. 본 증례는 심한 치주염으로 다수 치아 발치 후 상악은 전치부 고정성 보철 수복과 Kennedy class I 가철성 국소의치로 수복하고 하악은 양측성 고립 지대치만 남아있어 클래스프 국소의치로 수복하기에 예후가 불분명하여 프릭션핀을 이용한 하이브리드 텔레스코픽 이중관 국소의치를 이용하였다. 이중관 가철성 국소의치의 특성과 효용성을 고찰해 보고자 본 증례를 보고한다.

• 대한소아치과학회지
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• 제26권1호
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• pp.32-37
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• 1999

항시 장착이 가능한 reverse twin block 장치에 기능의 장애를 받지 않고도 lip pad의 효과를 첨가하기 위하여 가철식으로 lip pad를 제작하여 III급 부정교합의 치료에 적용해 본 결과 다음과 같은 결론을 얻었다. 1. Reverse twin block 장치는 장착한 상태에서 lip pad의 착탈을 통하여 정상적인 저작, 발음 등의 기능을 할 수 있으며 심미적이므로 III급 부정교합의 치료에 있어 상하악이 분리되어 있지 않은 다른 기능성 장치가 가진 단점을 극복할 수 있었다. 2. 본 증례에서는 저발육된 상악에 대한 효과적인 작용을 하는 lip pad를 가철식으로 제작하여 기능의 장애를 받지 않고도 양호한 치료효과를 얻을 수 있었다.

• 대한치과보철학회지
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• 제33권3호
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• pp.413-439
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• 1995

The purpose of this study was to evaluate the stress distribution developed in the supporting structures by mandibular distal extension removable partial dentures with 2 different direct retainer designs and with or without indirect retainer and abutment splinting. The examined direct retainers on the second bicuspid abutment tooth were Akers clasp and RPA clasp, the indirect retainer was located on the mesial fossa of the first bicuspid, and the first and second bicuspid were splinted in case of tooth splinting. Total 8 cases were compared and analyzed with 3-dimensional finite element method. 150N were applied vertically on the artificial teeth of the removable partial denture, and then stress distribution patterns were analyzed and compared. The results were as follows : 1. The forces transmitted to the abutment tooth were primarily from the occlusal rests. 2. The abutment tooth was displaced distally when the force was applied. The compressive stress was observed at the distal root surface of the abutment tooth and the tensile stress, at the mesial root surface. 3. The denture base was displaced posteriorly and inferiorly when the force was applied. At the more distal portion of the denture base, the greater displacement was observed.And the anterior portion of the major connector was displaced superiorly. 4. The occlusal rest placed on the distal part of the abutment tooth tended to tip the tooth more posteriorly than did one on the mesial part of that tooth. 5. Severe superior displacement was observed at the anterior portion of the major connector in case of removable partial dentures without indirect retainer. 6. In case of tooth-splinting, the stress was distributed through all the root surface of both abuments. In case of no tooth-splinting, the stress was concentrated on the distal root surface of the primary abutment.

• 대한치과의사협회지
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• 제55권12호
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• pp.842-849
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• 2017

The term, 'crossed occlusion' implies clinical situation in which the residual teeth in one arch have no contact with those in the antagonistic arch, resulting in the collapse of occlusal vertical dimension. The treatment goal of this pathologic condition is restoration of the collapsed vertical dimension and stabilization of abnormal mandibular position. Previously, konus removable prostheses or tooth supported overdentures were suggested to solve crossed occlusion. Nowadays, dental implants have been used for definitive support to solve this problem. In this case report, a 65 years old female patient had a crossed occlusion, in which the maxillary posterior residual teeth and mandibular anterior residual teeth cross. Interim removable and fixed dental prostheses were used to confirm the proper vertical and horizontal jaw relation. After that, the mandibular posterior edentulous region was restored with implant-supported fixed dental prostheses. Computer tomography guided implant surgery was performed according to the concept of the restoration-driven implant placement. The maxillary anterior edentulous region was restored with Kennedy class IV removable prosthesis, considering the patient's economic status. The patient's jaw position and prostheses have been well maintained at the follow-up after 6 months of definitive restoration. The antero-posterior crossed occlusion problems appeared to be effectively solved with the combination of removable in one arch and implant-supported fixed prostheses in the other.

• 대한치과보철학회지
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• 제55권1호
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• pp.94-99
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• 2017

CAD/CAM (computer-aided design/computer-aided manufacturing) 기술을 이용한 인레이 및 여러 고정성 보철물의 제작이 보편화되고 구강내 스캐너가 널리 보급되면서 디지털 치의학의 개념이 치과 보철학 분야 전반에 적용되고 있다. 그러나 가철성 보철 부분에서는 디지털 개념의 적용이 쉽지 않으며 기존의 주조 방식에 많이 의존하고 있다. 따라서 가철성 보철물의 제작 과정에 이런 개념을 적용해보려는 시도는 중요한 의미가 있다. 본 증례에서는 하악 Kennedy class III 무치악 환자에서 보철적, 심미적 요구에 의한 교합고경의 증가와 함께 CAD 및 쾌속조형술(RP, rapid prototyping)을 이용한 가철성 국소의치를 제작하였다. CAD를 이용하여 서베잉 및 국소의치 금속 구조물을 설계하였으며, 쾌속조형술은 금속 구조물을 주조하기 위한 레진 패턴 제작에 이용하였다. 9개월 간의 임상적 관찰 기간 동안 만족스러운 심미적, 기능적 결과를 얻어 이를 보고하고자 한다.