• The Journal of Advanced Prosthodontics
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• 제4권4호
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• pp.254-258
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• 2012

Implant-supported overdenture is a reliable treatment option for the patients with edentulous mandible when they have difficulty in using complete dentures. Several options have been used for implant-supported overdenture attachments. Among these, bar attachment system has greater retention and better maintainability than others. SFI-Bar$^{(R)}$ is prefabricated and can be adjustable at chairside. Therefore, laboratory procedures such as soldering and welding are unnecessary, which leads to fewer errors and lower costs. A 67-year-old female patient presented, complaining of mobility of lower anterior teeth with old denture. She had been wearing complete denture in the maxilla and removable partial denture in the mandible with severe bone loss. After extracting the teeth, two implants were placed in front of mental foramen, and SFI-Bar$^{(R)}$ was connected. A tube bar was seated to two adapters through large ball joints and fixation screws, connecting each implant. The length of the tube bar was adjusted according to inter-implant distance. Then, a female part was attached to the bar beneath the new denture. This clinical report describes two-implant-supported overdenture using the SFI-Bar$^{(R)}$ system in a mandibular edentulous patient.

• The Journal of Advanced Prosthodontics
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• 제9권3호
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• pp.143-151
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• 2017

PURPOSE. The design of the attachment must provide an optimum stress distribution around the implant. In this study, for implant overdentures with a bar/clip attachment or a locator attachment, the stress transmitted to the implant in accordance with the change in the denture base length and the vertical pressure was measured and analyzed. MATERIALS AND METHODS. Test model was created with epoxy resin. The strain gauges made a tight contact with implant surfaces. A universal testing machine was used to exert a vertical pressure on the mandibular implant overdenture and the strain rate of the implants was measured. RESULTS. Means and standard deviations of the maximum micro-deformation rates were determined. 1) Locator attachment: The implants on the working side generally showed higher strain than those on the non-working side. Tensile force was observed on the mesial surface of the implant on the working side, and the compressive force was applied to the buccal surface and on the surfaces of the implant on the non-working side. 2) Bar/clip attachment: The implants on the both non-working and working sides showed high strain; all surfaces except the mesial surface of the implant on the non-working side showed a compressive force. CONCLUSION. To minimize the strain on implants in mandibular implant overdentures, the attachment of the implant should be carefully selected and the denture base should be extended as much as possible.

• 대한치과기공학회지
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• 제40권4호
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• pp.217-224
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• 2018

Purpose: The aim of this study was to evaluate accuracy of three type complete mandibular denture of before and after polymerization. Methods: Mandibular edentulous model was selected as the master model. 15 study models were made by Type IV stone. Wax complete mandibular dentures were produced by the denture base and artificial teeth. Before and after curing, STL files were obtained using a blue scanner. By superimposing the digitized complete mandibular denture data(after curing) with the CAD-reference(before curing) three-dimensionally, visual fit-discrepancies were drawn by calculating the root mean square (RMS) and visualized on a color-difference map. Each calculated RMS-value was statistically analyzed by 1-way analysis of variance(ANOVA) (${\alpha}=.05$). Results: Mean(SD) RMS-values was OM group $88.98(6.10){\mu}m$, BM group $82.35(13.46){\mu}m$, BDM group $77.83(9.46){\mu}m$. The results of the 1-way ANOVA showed no statistically significant differences in the RMS values of the Three groups for the material (P > .241). Conclusion : Deformation of artificial teeth position was observed in all groups after resin polymerization. But the values, all group were within the clinically acceptable range. The values of BDM group showed the least deformation than the other two groups.

• The Journal of Advanced Prosthodontics
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• 제13권1호
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• pp.55-64
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• 2021

PURPOSE. To investigate the biomechanical effect of marginal bone resorption (MBR) on the mandibular mini implant (MI)-retained overdenture (MI-OD) on the edentulous model. MATERIALS AND METHODS. The experimental mandibular edentulous model was modified from a commercial model with 2 mm thick artificial soft tissue under denture base. Two MIs (Φ2.6 mm × 10 mm) were bilaterally placed between the lateral incisor and the canine area and attached with magnetic attachments. Three groups were set up as follows: 1) alveolar bone around the MI without MBR (normal group), 2) with MBR to 1/2 the length of the implant (resorption group), and 3) complete denture (CD) without MI (CD group). Strain around the MI, pressure near the first molar area, and displacement of denture were simultaneously measured, loading up to 50 N under bilateral/unilateral loading. Statistical analysis was performed using independent-samples t test and one-way ANOVA (α=.05). RESULTS. The strain around the MI with MBR was approximately 1.5 times higher than that without MBR. The pressure in CD was higher than in MI-ODs (P<.05), while there was no statistical difference between the normal and resorption group (P>.05). Similarly, the CD demonstrated a greater displacement of the denture base than did the MI-ODs during bilateral and unilateral loadings (P<.05). CONCLUSION. The strain around the MI with MBR was approximately 1.5 times higher than that without MBR. The pressure on posterior alveolar ridge and denture displacement of MI-ODs significantly decreased compared to CDs, even when MBR occurs. Bilateral balanced occlusion was recommended for MI-ODs, especially when MBR occurred.

• 대한치과보철학회지
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• 제62권2호
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• pp.174-182
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• 2024

다수의 구치를 상실한 환자에서는 전방부 치아들의 마모나 변위, 교합평면의 붕괴와 교합수직고경의 감소가 일어날 수 있다. 특히 편측으로 소수의 치아만 가진 경우 국소의치는 생역학적으로 불리하므로, 소수의 임플란트 서베이드 크라운을 추가한 임플란트 보조 국소의치가 대안이 될 수 있다. 본 증례의 환자는 하악 우측 구치부 상실로 인해 전방부 치아들이 심하게 마모되고, 교합평면이 붕괴되어 있었다. 최소한의 교합 수직고경 거상과 함께 상악 고정성 보철 및 하악 임플란트 보조 국소의치로 수복을 진행하였고, 기능적 및 심미적으로 양호한 임상 결과를 얻을 수 있었다.

• 대한치과보철학회지
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• 제57권4호
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• pp.389-396
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• 2019

심하게 흡수된 치조제에서 의치의 유지력을 얻기 어려운 경우, 의치가 불안정하게 되어 의치 사용이 어렵다. 흡착 의치는 의치상 변연부를 가동 점막으로 봉쇄하여 폐구 시에 의치상 내면에 생기는 음압 형성을 통해 더 높은 유지와 안정을 목표로 한다. 본 증례에서는 4명의 환자들이 의치가 헐겁다는 주소로 내원하였다. 의치의 유지력에 대한 높은 요구도를 반영하여 흡착 의치의 개념을 이용하여 유지와 안정을 얻고자 하였다. 무치악 환자들에서 흡착의치를 이용한 보철 수복 시 고려할 사항들에 대하여 비교 분석하여 보고하고자 한다.

• 대한치과의사협회지
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• 제54권12호
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• pp.996-1023
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• 2016

There are many kinds of maintenance care services for removable denture patient. Adjustment of the denture base and occlusion should be performed regularly not only for pain relief but also for maintaining the denture function. Direct and indirect relining are needed frequently in specific cases including mandibular distal extension case or non-symmetric residual teeth situation. Surface treatments for metal and resin are essential in the relining procedure. Clinical process for the denture repair is similar to indirect relining which needs inter-occlusal registration. Especially, the peridontal maintenance care and caries prevention are most important way to preserve the abutment teeth in partial edentulism. Moreover, the caring method for the denture and the tissue should be instructed to the denture patient.

• The Journal of Advanced Prosthodontics
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• 제4권4호
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• pp.204-209
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• 2012

PURPOSE. The aim of this systematic review is to address treatment outcomes of Mandibular implant overdentures relative to implant survival rate, maintenance and complications, and patient satisfaction. MATERIALS AND METHODS. A systematic literature search was conducted by a PubMed search strategy and hand-searching of relevant journals from included studies. Randomized Clinical Trials (RCT) and comparative clinical trial studies on mandibular implant overdentures until August, 2010 were selected. Eleven studies from 1098 studies were finally selected and data were analyzed relative to number of implants. RESULTS. Six studies presented the data of the implant survival rate which ranged from 95% to 100% for 2 and 4 implant group and from 81.8% to 96.1% for 1 and 2 implant group. One study, which statistically compared implant survival rate showed no significant differences relative to the number of implants. The most common type of prosthetic maintenance and complications were replacement or reattaching of loose clips for 2 and 4 implant group, and denture repair due to the fracture around an implant for 1 and 2 implant groups. Most studies showed no significant differences in the rate of prosthetic maintenance and complication, and patient satisfaction regardless the number of implants. CONCLUSION. The implant survival rate of mandibular overdentures is high regardless of the number of implants. Denture maintenance is likely not inflenced substantially by the number of implants and patient satisfaction is typically high again regardless os the number of implants.

• 대한치과보철학회지
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• 제52권4호
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• pp.346-351
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• 2014

흡착 의치는 의치상연 주위 전체를 가동 점막으로 봉쇄하여 연하나 교합 시 의치상 내면에 일시적으로 음압을 형성하여 의치의 유지와 안정을 강화한다. 본 증례의 환자는 81세의 남자 환자로 새로운 의치를 제작하고 싶다는 주소로 내원하였다. 의치의 유지와 저작 효율에 대한 환자의 높은 요구도를 고려하여 흡착 의치를 통한 총의치 제작을 계획하였다. 하악 후구치 융기 부위를 가압하지 않은 채로 예비 인상을 채득 후 상하악 진단모형을 제작하였다. 이후 개인 트레이 제작 후 최종 인상 채득과 동시에 고딕 아치 기록을 시행하여 중심위 및 수직 고경을 채득하였으며, 상악에는 해부학적 치아, 하악에는 비해부학적 치아를 배열하여 설측 교합을 형성하였다. 이상과 같이 완전 무치악 환자에서 하악 흡착 의치를 통한 총의치 수복은 만족스러운 유지와 기능을 회복할 수 있었기에 본 증례를 보고하고자 한다.

• 대한치과보철학회지
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• 제58권2호
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• pp.145-152
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• 2020

심미와 기능이 조화를 이루는 총의치 제작을 위해서는 상하악 관계를 정확히 기록하는 것이 필수적이다. 고딕아치 묘기법은 하악의 운동을 시각적으로 보여주며, 정확하고 반복재현성 있는 중심위를 확립하는데 유용하다. 또한, 고도의 치조제 흡수를 갖는 환자에서는 총의치의 적절한 유지 및 안정을 얻기가 어려운데, 이런 경우 환자의 생리적인 동작으로 변연을 형성하여 의치상연 주위가 가동점막으로 봉쇄되도록 하는 폐구 인상법이 유용할 수 있다. 본 증례에서는 우측 하악과두골절 병력과 고도의 하악 치조제 흡수를 보이는 환자에서 폐구인상법과 고딕아치 묘기법을 이용한 총의치로 수복하였고 만족할 만한 결과를 얻어 보고하는 바이다.