• Title/Summary/Keyword: 정출

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Complications of implants confronting the extruded posterior teeth (정출된 구치와 대합되는 임플란트의 합병증)

  • Jung, Yeon-Wook;Lee, Su-Yeon;Kim, Hee-Jung
    • Journal of Dental Rehabilitation and Applied Science
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    • v.36 no.4
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    • pp.232-241
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    • 2020
  • Purpose: This study investigated the complications and patterns of implants that confronted with the extruded natural teeth. Materials and Methods: Among patients who received implant treatment between 2006 and 2018 at Chosun University Dental Hospital, only implants that had a maintenance period of at least 5 years and that both implants and confronting natural teeth could be measured and compared on a radiograph were selected. They were divided into two groups. Group 1, experimental group consisted of Implants confronting the extruded natural posterior teeth (n = 167: maxilla (Group 1max) = 92, mandible (Group 1man) = 75) and Group 2, control group consisted of Implants confronting the normal natural posterior teeth (n = 656: maxilla (Group 2max) = 272, mandible (Group 2man) = 384). Results: The incidence of complications between Group 1 and Group 2 was statistically significant. In particular, there was a statistically significant difference between the frequency of marginal bone loss and the amount of marginal bone loss. Conclusion: The extruded natural tooth may cause more frequent complications including bone resorption in the opposing implant.

Fixed Prosthodontic Restorations after Forced Eruption of Traumatised Anterior Teeth (치아 정출술을 이용한 고정성 보철 수복)

  • Kim, Dae-Gon;Cho, Lee-Ra;Park, Chan-Jin
    • Journal of Dental Rehabilitation and Applied Science
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    • v.24 no.3
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    • pp.243-251
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    • 2008
  • A subgingival crown-root fracture presents a restorative problem to the clinician because restoration is complicated by the need to maintain the sound tooth structures. Forced eruption offers a method of treatment of teeth fractured close to the alveolar crest. Extrusion of such teeth allows elevating the fracture line above the epitherial attachment and so the proper finishing margins can be prepared. The purpose of this case is to report successful tooth restoration using forced eruption in case of crown-root fractures.

Forced orthodontic eruption for augmentation of soft tissue prior to implant placement (임플란트 식립 전 연조직 증대를 위한 교정적 정출술)

  • Park, Chul-Wan
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.29 no.1
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    • pp.54-61
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    • 2020
  • Forced orthodontic eruption(FOE) is a non-surgical treatment approach that allows augmenting both soft- and hard-tissue profiles of potential implant sites, by forced orthodontic extrusion of "hopeless" teeth and their periodontal apparatus. By stretching the gingival and periodontal ligament fibers during extrusion, tension is imparted to the entire alveolar socket, stimulating osseous apposition at the alveolar crest. FOE increases the width of the attached gingiva, and the mucogingival junction remains stable when the gingival margin migrates coronally. Based on these effects, FOE of non-restorable teeth prior to implant placement is a viable alternative to conventional surgical augmentative procedures in implant site development. The aim of this case report is to describes coronal soft-tissue augmentation around fractured teeth, which was achieved by FOE before implant placement.

Intentional Passive Eruption Combined with Scaling and Root Planing of Teeth with Moderate Periodontitis (중등도 만성 치주염에 이환된 치아의 의도적 수동 정출을 동반한 비외과적 치료)

  • Lee, Ju-Youn
    • Journal of Dental Rehabilitation and Applied Science
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    • v.29 no.2
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    • pp.195-202
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    • 2013
  • The relationship between occlusion and periodontal health has been studied extensively. Despite this, there are few reports on the effects of intentional passive eruption (IPE) using an occlusal reduction. The aim of this clinical report was to present the favorable long-term results of IPE using an occlusal reduction combined with scaling and root planing. After periodontal examination, teeth were diagnosed as moderate chronic periodontitis with intrabony defects and mobility. IPE was performed using periodic occlusal reduction combined with initial periodontal therapy. All teeth examined healed uneventfully and the patients did not complain of discomfort. It has been clinically well maintained during 8 years after completion of IPE. Overall, these results suggest that the IPE would be helpful in improving periodontal health.

EFFECT OF CANAL PREPARATION METHODS ON THE APICAL EXTRUSION OF DEBRIS (근관형성법이 근관잔Δ사의 치근단 정출에 미치는 영향)

  • Park, Ju-Myong;Kim, Sung-Kyo
    • Restorative Dentistry and Endodontics
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    • v.24 no.2
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    • pp.399-407
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    • 1999
  • Apical extrusion of canal debris is occurred inadvertently during root canal preparation and this could produce interappointment discomfort or postinstrumentation pain. The purpose of this study was to investigate the influence of canal preparation methods on the apical extrusion of canal debris by means of comparing the amounts of apically extruded debris with several kinds of instrumentation methods. In the first experiment, 40 incisors were divided into four groups of 10 each. They were instrumented using one of the four techniques: Step-back, crown-down pressureless technique with stainless steel K-files, engine-driven instrumentation with Quantec series 2000, and Profile .04 taper series 29. Root canal irrigation was done with 2.52% sodium hypochlorite solution. In the second experiment, 80 incisors were divided into five groups of 16 each and instrumented using step-back, crown-down pressureless technique with stainless steel K-files, engine-driven instrumentation such as Quantec SC, Quantec LX, and Profile .04 taper series 29 No irrigation procedure was performed in this second experiment. Extruded debris from each tooth was collected in a container and weighed by the use of an electronic balance after desiccation. With or without canal irrigation, step-back technique produced significantly more amount of apical debris than the other groups (p<0.05). However, there was no significant difference among crown-down pressureless technique, engine-driven instrumentation with Quantec LX, Quantec SC, or Profile. Therefore, either by hand or engine-driven instrumentation, it is concluded that to minimize apical debris, techniques using reaming motion of files should be applied rather than filing motion.

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A Novel Slury-Making Process for AZ91-Alloy Rheocasting

  • Byun, Ji-Young;Kwon, Soon-Il;Yoon, Jin-Kook;Kim, Seon-Jin
    • Journal of Korea Foundry Society
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    • v.23 no.3
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    • pp.153-157
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    • 2003
  • 본 논문은 레오캐스팅용 AZ91 합금 슬러리를 제조하는 새로운 방법에 관한 것이다. 그 원리는 AZ91 합금 액상에서 Mn의 용해도차에 의해 생성되는 $Al_8(Mn,Fe)_5$ 정출물을 ${\alpha}-Mg$ 초정 생성을 위한 불균일 핵생성 자리로 사용하고자 하는 것이다. 제조된 슬러리의 미세조직 분석결과 $Al_8(Mn,Fe)_5$ 정출물이 ${\alpha}-Mg$ 내에 위치하고 있어, 이로부터 정출물이 효과적으로 불균일 핵생성 자리로 작용하고 있음을 알 수 있었다. 또한 Mn 함량의 증가는 $Al_8(Mn,Fe)_5$ 정출물 수를 증가시켜 고상분율이 일정할 때 슬러리 내 ${\alpha}-Mg$ 고상의 크기를 감소시키고 구형도를 향상시킨다. 이외에도 냉각속도 및 유지시간이 슬러리 미세조직에 미치는 영향에 대해서도 보고하였다.

A case of unexpected adjacent tooth extrusion after implant fixed prosthetic treatment, who had undergone mandibular resection and reconstruction due to ameloblastoma (법랑모세포종으로 하악골 절제 및 재건술 시행한 환자에서 임플란트 고정성 보철물 수복 후 원인 미상의 인접 치아 정출이 발생한 증례 및 고찰)

  • Kim, Su-Jin;Ha, Tae-Wook;Kim, Hyung Jun;Kim, Jee Hwan
    • The Journal of Korean Academy of Prosthodontics
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    • v.57 no.4
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    • pp.448-455
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    • 2019
  • Ameloblastoma is a benign odontogenic epithelial tumor with high recurrence rate and requires extensive resection of the surrounding tissue and reconstruction of defect site. Because of the anatomical limitation of the reconstruction site, prosthetic treatment with implants is the first recommendation. This is a case of prosthetic restoration of the reconstruction site with implant fixed prosthesis in patient who underwent mandibular resection and iliac bone reconstruction due to ameloblastoma. However 14 months after completion of implant prosthesis, adjacent natural tooth erupted unexpectedly, resulting in 1mm infra-occlusion occurred including posterior implant prosthesis and anterior natural teeth. In adults, implant infra-occlusion may occur due to residual growth after placement of the maxillary anterior implant. But this case, hypo-occlusion of molar implant and open bite of anterior natural teeth is occurred due to extrusion of adjacent tooth, is rare. Thus we report the treatment process including orthodontic treatment with intrusion of the posterior tooth, and investigate the causes of sudden, unexpected tooth extrusion.

A multidisciplinary approach to restore crown-root fractured maxillary central incisors: orthodontic extrusion and surgical extrusion (치관-치근 파절이 발생한 상악 중절치를 수복하기 위한 다각적 접근법: 교정적 정출술과 외과적 정출술)

  • Kwon, Eun-Young;Kim, So-Yeun;Jung, Kyoung-Hwa;Choi, Youn-Kyung;Kim, Hyun-Joo;Joo, Ji-Young
    • Journal of Dental Rehabilitation and Applied Science
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    • v.36 no.4
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    • pp.262-271
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    • 2020
  • To restore a tooth with a fracture line extending below the marginal bone level, a surgical crown lengthening procedure accompanied by ostectomy could be considered to expose the fracture line and reestablish the biologic width. However, this procedure could lead to esthetic failure, especially in the anterior teeth. Therefore, orthodontic extrusion, which elevates the fracture line from within the alveolar socket without sacrificing the supporting bone and gingiva, is recommended. This technique allows for the proper placement of the crown on a sound tooth structure, with the reestablishment of the biologic width. Alternatively, surgical extrusion is an one-step procedure that is simpler and less time-consuming than orthodontic extrusion; placing and adjusting the orthodontic appliance does not require multiple visits. This study presents successful restoration in 2 cases with a crown-tooth root fracture of the maxillary central incisor treated using a multidisciplinary approach through orthodontic extrusion or surgical extrusion followed by successful restoration.

Full mouth rehabilitation of class III patient with disharmonious occlusal plane: A case report (Class III 악간관계와 교합평면 부조화를 보이는 환자의 전악수복증례)

  • Kim, Hayeong;Paek, Janghyun;Kwon, Kung-Rock;Pae, Ahran
    • The Journal of Korean Academy of Prosthodontics
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    • v.54 no.4
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    • pp.451-457
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    • 2016
  • Prosthodontic decision-making process is done through analysis of clinical information and mutual communication between patient and dentist. When opposing teeth are extruded due to missing tooth or tooth defects, selection of appropriate treatment plan and predictory prognosis can be complicated in functional rehabilitation. In case of severely disharmonious occlusal plane result from extruded teeth, re-establishment of the occlusal plane is required, if necessary via prudent evaluation. In this case, class III patient had unesthetic appearance and mastication discomfort caused by disharmonious occlusal plane due to severe extrusion. Through a structured diagnostic process, appropriate treatment plan was selected. Esthetic and functional results were obtained through from full mouth rehabilitation with re-establishment of the occlusal plane.