• Title/Summary/Keyword: Hybrid crown

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Causes of failed implant attachments and application of double crown implant overdenture in one patient (한 환자에서 실패한 임플란트 부착장치들의 원인과 이중관 임플란트 피개 의치의 적용)

  • Kwon, Jae-Uk;Cho, Jin-Hyun
    • The Journal of Korean Academy of Prosthodontics
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    • v.56 no.4
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    • pp.368-374
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    • 2018
  • In this case, the patient was restored with gold Hader bar mandibular implant overdenture using two implants about 10 years ago, and the retentive force was lost due to severe wear of the bar due to 3.5 years use. The overdenture was repaired using a Locator attachment, but the male part was completely worn after 6.5 years use. Finally, we used a hybrid telescopic double crown with a friction pin to fabricate a new implant overdenture, which was observed for 2 years and showed excellent prognosis. So, we describe the cause of failure of each attachment (Gold Hader bar, Locator) in two implant overdentures and report on the advantages and disadvantages of double crown implant overdenture and the conditions for success.

Assessment of Wear Resistance in Tooth-Colored Materials for Primary Molar Crown Restoration in Pediatric Dentistry

  • Hyun Seok Kang;Yooseok Shin;Chung-Min Kang;Je Seon Song
    • Journal of the korean academy of Pediatric Dentistry
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    • v.51 no.1
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    • pp.22-31
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    • 2024
  • The objective of this study was to assess the wear resistance of tooth-colored materials used in crown restoration for primary molars with a chewing simulator. In this study, four groups-three experimental groups and one control group-were included. They consisted of three-dimensional (3D) printed resin crowns (NextDent and Graphy), milled nano-hybrid ceramic crowns (MAZIC Duro), and prefabricated zirconia crowns (NuSmile). Twelve mandibular second molar specimens were prepared from each group. In the wear experiment, 6.0 × 105 cycles were conducted with a force of 50 N, and a 6 mm-diameter steatite ball was used as an antagonist. The amount of wear was calculated by comparing the scan files before and after the chewing simulation using 3D metrology software, and the worn cross-section was confirmed by scanning electron microscopy (SEM). The resin and ceramic groups did not exhibit any statistically significant differences. However, compared to other crown groups, the zirconia crown group demonstrated notably reduced levels of wear (p < 0.05). In SEM images, layers and cracks were observed in the 3D-printed resin crown groups, which differed from those in the other groups.

Treatment of the cleft lip and palate patient with few remaining posterior teeth using hybrid telescopic crown denture (치주질환에 이환된 소수 잔존치를 가지는 구순구개열 환자에서의 상악 혼성 이중관 의치를 이용한 수복증례)

  • Park, Jin-Wook;Cho, Jin-Hyun
    • Journal of Dental Rehabilitation and Applied Science
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    • v.33 no.4
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    • pp.284-290
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    • 2017
  • For individuals with cleft lip and palate, the removable partial dentures (RPDs) have been an important treatment option. Some modifications from conventional prosthetic treatment may be necessary to achieve satisfactory functional and esthetic results in cleft patients. In case of cleft palate patient with periodontally compromised and only posterior few remaining teeth, removable partial prosthesis connected to telescopic crown can be the alternative treatment option. When connected to the RPD, telescopic crowns increase the prosthetic stability and retention, optimize favorable force transmission to the long dental axis, and improve esthetics. And the cross arch stabilization of double crown denture helps to stabilize both divided maxillary ridges in CLP patient. This case present one adult CLP patient using an RPD connected with hybrid telescopic crowns with friction pins to improve not only retention and stability but also aesthetics.

Prosthetic rehabilitation for patient with hemi-maxillectomy: Obturator combined with a hybrid telescopic double crown using friction pin (편측 절제된 상악골 환자에서 하이브리드 텔레스코픽 이중관 의치를 이용한 구강 폐색기 수복 증례)

  • Seo, Jeong-Gyo;Cho, Jin-Hyun
    • Journal of Dental Rehabilitation and Applied Science
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    • v.34 no.4
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    • pp.317-323
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    • 2018
  • When oral cancer develops in the maxilla, oro-nasal communication occurs after surgical treatment including removal of the primary site. Restoration through an obturator is necessary to prevent food from storing due to non-oral opening, and to ensure proper pronunciation and aesthetic restoration. In this case, the patient was treated with right hemi-maxillectomy due to oral cancer and has residual abutment and poor periodontal support due to the effect of head and neck radiotherapy. The obturator was treated with a hybrid telescopic double crown denture. Reporting a successful prognosis in 18 months of follow-up.

Synthesis of Allyl Functionalized Silacrown Ethers and Their Application - A Review

  • Haque, Md Hasanul;Sohn, Honglae
    • Journal of Integrative Natural Science
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    • v.13 no.2
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    • pp.41-46
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    • 2020
  • A study is reported about the synthesis processes of various silacrown ether by the reaction of alkoxysilanes with polyethylene glycols (PEG) through transesterification. Crown ether-functionalized carbosilane dendrimers and hybrid crown ethers are also discussed. We will also address the solubility enhancement, phase-transfer catalysis of different silacrown as well as their application as Ion-selective electrodes (ISEs) and as active phase of PVC electrodes for the development of potentiometric sensors for detection of alkali-Ions.

A clinical report of hybrid telescopic double crown denture with friction pin in a failed double crown denture case (실패한 이중관 국소의치에서 하이브리드 텔레스코픽 이중관 국소의치를 이용한 임상증례)

  • Park, Jong-Hoon;Cho, Jin-Hyun
    • The Journal of Korean Academy of Prosthodontics
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    • v.59 no.2
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    • pp.201-209
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    • 2021
  • In removable partial dentures, many types of retentive systems have been studied and applied in clinical treatment. One of those systems is the double crown denture system which is widely used in European countries such as Germany and Sweden. Telescopic double crown dentures have several advantages such as convenience in maintaining oral hygiene, enabling to transfer occlusal force along the long axis of the abutment, and secondary splinting effect between the abutments which leads to higher clinical performance compared to conventional removal partial dentures. In this clinical case, the patient was initially restored with a maxillary hybrid telescopic double crown denture with friction pin using remaining natural teeth as abutments. After 7 years, due to lack of recall check-up and poor oral hygiene, the abutment teeth were affected by periodontitis and 4 out of 5 of the abutment teeth had to be extracted. 3 additional implants were placed and the original abutment tooth with the inner crown was maintained. The mandible had fixed prostheses including implants but nevertheless, with strategic implant placement, the patient adapted well and was satisfied with the new maxillary tooth-implant combined double crown denture.

An evaluation of the stress effect of different occlusion concepts on hybrid abutment and implant supported monolithic zirconia fixed prosthesis: A finite element analysis

  • Yesilyurt, Nilgün Gulbahce;Tuncdemir, Ali Riza
    • The Journal of Advanced Prosthodontics
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    • v.13 no.4
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    • pp.216-225
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    • 2021
  • PURPOSE. The aim of this study is to evaluate the effects of canine guidance occlusion and group function occlusion on the degree of stress to the bone, implants, abutments, and crowns using finite element analysis (FEA). MATERIALS AND METHODS. This study included the implant-prosthesis system of a three-unit bridge made of monolithic zirconia and hybrid abutments. Three-dimensional (3D) models of a bone-level implant system and a titanium base abutment were created using the original implant components. Two titanium implants, measuring 4 × 11 mm each, were selected. The loads were applied in two oblique directions of 15° and 30° under two occlusal movement conditions. In the canine guidance condition, loads (100 N) were applied to the canine crown only. In the group function condition, loads were applied to all three teeth. In this loading, a force of 100 N was applied to the canine, and 200-N forces were applied to each premolar. The stress distribution among all the components of the implant-bridge system was assessed using ANSYS SpaceClaim 2020 R2 software and finite element analysis. RESULTS. Maximum stress was found in the group function occlusion. The maximum stress increased with an increase in the angle of occlusal force. CONCLUSION. The canine guidance occlusion with monolithic zirconia crown materials is promising for implant-supported prostheses in the canine and premolar areas.

A FA Intersectional Hybrid Lily 'Orange Crown' with Orange Petals (오렌지색 FA 아속간 잡종나리 '오렌지 크라운' 육성)

  • Rhee, Hye Kyung;Cho, Hae Ryong;Lim, Jin Hee;Kim, Mi Seon;Park, Sang Kun;Shin, Hak Ki;Joung, Hyang Young
    • Korean Journal of Breeding Science
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    • v.42 no.6
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    • pp.654-658
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    • 2010
  • A FA (Lilium formolongi $\times$ Lilium asiatic hybrid) intersectional hybrid lily cultivar 'Orange Crown' was developed in 2007 at National Institute of Horticultural and Herbal Science (NIHHS), Rural Development Administration (RDA) of Korea. The cross and immature embryo rescue was conducted between female parents 'Migreen' (Lilium formolongi 'Raizan' $\times$ Lilium asiatic hybrid 'A61') and male parent 'A01-187' (L. asiatic 'A96-28' $\times$ 'Sanzio') by cut style pollination method at Suwon in 2001. It was preliminarily selected as 'FA04-27' in 2004. Multiplication, bulb production and characteristic tests were conducted from 2004 to 2007. The evaluation of characteristics and preference were surveyed at a lily flower show of NIHHS at Taean in 2007. 'Orange Crown' flowers in the late of June and grows more than 183 cm stem length. Flowers bloom upward-facing, a little spotted and orange (RHS, O24A) petals. The pollen of 'Orange Crown' was sterile.

Prosthetic Treatment Strategies for Improving Denture Retention in Pediatric Patients with Hypohidrotic Ectodermal Dysplasia: a Report of Two Cases (저한성 외배엽 이형성증을 가진 소아 환자에서 의치 유지력 향상을 위한 보철 치료 전략: 두 가지 증례 보고)

  • Hongju Jeon;Seonmi Kim;Namki Choi
    • Journal of the korean academy of Pediatric Dentistry
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    • v.50 no.4
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    • pp.483-494
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    • 2023
  • This report presents two cases concerning strategies for improving denture retention in pediatric patients with oligodontia caused by hypohidrotic ectodermal dysplasia (HED). Both patients presented with multiple missing teeth, conical canines, alveolar bone atrophy, and a skeletal Class III tendency. In the first case, a modified form of conical-crown-retained denture was used to cover the canines. This approach was carried out without tooth extraction or coping. In the second case of severe alveolar bone resorption and a distally tilted lower left canine, the tooth was restored with a hybrid ceramic crown. It was subsequently converted into a clasp-retained removable partial denture, utilizing a suction mechanism. Both patients are currently receiving regular check-ups for the maintenance of their prosthetic appliances and the evaluation of their growth patterns. This study presents innovative prosthetic treatment methods for pediatric patients with HED who have inadequate denture retention.