• Title/Summary/Keyword: 지르코니아 보철물

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Detachable zirconia prosthesis using Milled bar and ADD-TOC attachment in partial edentulous mandible: A case report (하악 부분 무치악 환자에서 Milled-bar와 ADD-TOC 부착 장치를 이용한 탈착 가능한 지르코니아 보철물 수복 증례)

  • Min-Sung Sohn;Jung-Bo Huh
    • The Journal of Korean Academy of Prosthodontics
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    • v.61 no.1
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    • pp.90-99
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    • 2023
  • Implant overdentures are widely used as a treatment method to restore oral function in completely edentulous or partially edentulous patients with severe bone resorption. Using a milled bar, it is mechanically advantageous as the implant fixtures are splinted. Applying additional attachments to the bar has the advantage of dispersing the stress applied to the implant. In this case, a patient who used implant overdentures using 4 implants wanted to fabricate a new prosthesis due to repeated fractures of the denture and weakened retention. Milled bar with ADD-TOC attachment and zirconia prosthesis were fabricated by CAD-CAM method and mechanically and aesthetically satisfactory results were obtained.

A noninvasive esthetic treatment of isolated microdontia using new high-translucent cubic-phase zirconia (5Y-PSZ) laminate veneers: A case report (고투명도 입방정상 지르코니아(5Y-PSZ) 라미네이트를 이용한 왜소치의 비침습적 심미 수복 증례)

  • Ahn, Min-Zin;Ahn, Do-Gwan;Pyo, Se-Wook;Kim, Hee-Kyung
    • The Journal of Korean Academy of Prosthodontics
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    • v.57 no.3
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    • pp.263-270
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    • 2019
  • Current trends in restorative dentistry focus on improving the esthetics and keeping the sound dental tissues as long as possible. The aims of this case report were to describe the successful outcome of cubic-phase zirconia laminate veneers for a patient with isolated microdontia by using a digital workflow, and to describe their clinical implications. A 15-year-old female who had isolated microdontia in combination with spacing visited Ajou University Dental Hospital for esthetic treatment. In this case, 6 maxillary anterior teeth were restored with cubic-phase zirconia laminate veneers without tooth structure removal by using a digital impression, computer-aided design (CAD) software, and computer-aided manufacturing (CAM) procedures. At 6-month follow-up, no distinct mechanical and biological complications were detected and the prostheses exhibited satisfactory esthetics and functions. Due to its favorable tissue responses and enhanced translucency, cubic-phase zirconia can be a suitable strategy for a noninvasive esthetic approach.

Full mouth rehabilitation using zirconia crown in severe worn dentition: a case report (마모가 심한 환자에서 지르코니아 크라운을 이용하여 전악 수복한 증례)

  • Park, Jung-Hyun;Sohn, Sang-Hyuk;Cho, Sung-Am
    • Journal of Dental Rehabilitation and Applied Science
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    • v.32 no.3
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    • pp.202-208
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    • 2016
  • The progressive attrition of teeth is a normal process by aging. However, excessive tooth wear with decreased vertical dimension of occlusion and collapse of occlusal plane may cause pathologic pulpal condition, occlusal disharmony and functional disorders. In this case, a patient with severely worn dentition was treated. Diagnostic wax-up was performed at the increased vertical dimension. After evaluation of provisional restorations for 12 weeks, final restorations were fabricated with zirconia crown and routine clinical assessments were made. Esthetically and functionally satisfactory results were obtained.

Influence of High Temperature of the Porcelain Firing Process on the Marginal Fit of Zirconia Core (도재 소성 과정에서의 고온이 지르코니아 코어의 변연적합도에 미치는 영향)

  • Kim, Jae-Hong;Kim, Ki-Baek
    • Journal of dental hygiene science
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    • v.13 no.2
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    • pp.135-141
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    • 2013
  • One factor for successful prognosis of finished dental prosthesis is good marginal fit. The purpose of this study in vitro investigation was to compare the marginal fit of all-ceramic crown before and after porcelain veneering, to evaluate the influence of high temperature of the porcelain firing on the fit. For this experiment, model of abutment tooth of maxillary right central incisor was prepared. Ten working models were produced. Ten zirconia cores were made by dental computer aided design/computer aided manufacturing system. The marginal fit of specimens were examined using silicone replica technique. Silicone replicas were sectioned four times and were measured through a digital microscope (${\times}160$). Marginal fit is a distance connected between edge end part of specimen and abutment margin. Each specimens was measured twice, the first measurement was done prior to veneering porcelain firing, while the second measurement was done after the porcelain firing to evaluate this process. Statistical analyses were performed with paired t-test. $Mean{\pm}SD$ marginal fit was $60.8{\pm}14.2{\mu}m$ for zirconia core and $86.1{\pm}13.3{\mu}m$ for all-ceramic crown. They were statistically significant differences (p<0.001). But all specimens showed a marginal fit where the gap widths ranged within the clinical recommendation ($120{\mu}m$), all-ceramic crown production using the zirconia core was adequate.

Potential of monolithic zirconia crown using Ko's coloring (심미 수복 치료의 관점에서 바라본 Ko's Coloring을 이용한 Monolithic zirconia crown의 가능성)

  • Ko, Kyung-Hun
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.25 no.2
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    • pp.109-126
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    • 2016
  • According of the development and spread of CAD/CAM, a number of prostheses we have done had been replaced. Dental technicians have a difficulty reproducing natural color when producing these zirconia crowns. Difficulty reproducing natural color when producing these zirconia crowns. In my case, in the beginning of experimenting with zirconia, I had a hard time dealing with zirconia and I have tried solve these problems. Therefore, I would like to share Ko's coloring technique made of my effort with you.

Implant-supported prosthetic rehabilitation for the edentulous maxilla using the additive manufacturing technology: A case report (레이저 적층 제조 기술을 이용한 상악 무치악 환자의 임플란트 고정성 보철 수복 증례)

  • Kim, Hee-Kyung
    • The Journal of Korean Academy of Prosthodontics
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    • v.56 no.2
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    • pp.173-178
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    • 2018
  • The direct metal laser sintering (DMLS) technique would be promising for the full-arch implant-supported restorations due to reduced cost and manufacturing time without potential human errors and casting defects. The aims of this case report were to describe the successful outcome of an implant-supported fixed dental prosthesis in the edentulous maxilla by using the DMLS technology and computer-aided design and computer-aided manufacturing (CAD/CAM) monolithic zirconia crowns, and to describe its clinical implications. A healthy 51-year-old Korean woman visited Seoul National University Dental Hospital and she was in need of a rehabilitation of her entire maxilla due to severe tooth mobility. In this case, all maxillary teeth were extracted and an implant-supported fixed dental prosthesis was fabricated that involved a cobalt-chromium (Co-Cr) framework with the DMLS technique and CAD/CAM monolithic zirconia crowns. Six months after delivery, no distinct mechanical and biological complications were detected and the prosthesis exhibited satisfactory esthetics and function. In this case report, with the DMLS system, the three-dimensional printed prosthesis was created without additional manual tooling and thus, reliable accuracy and passive fit were obtained.

Effect of Metal Chloride Coloring Liquids on Color and Strength Changes of Tetragonal Zirconia Polycrystals (금속염화물 착색제 침투가 정방정 지르코니아 다결정체의 색조와 강도 변화에 미치는 영향)

  • Oh, Jong-Jin;Noh, Hyeong-Rok
    • Journal of dental hygiene science
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    • v.15 no.5
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    • pp.577-584
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    • 2015
  • The purpose of this study was to evaluate the effect of metal chloride infiltration treatment on color and strength changes of the yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). Fifty disc specimens were prepared with a Y-TZP powder (ZPEX; Tosoh, Japan). Thirty different metal chloride solutions containing 0.03~0.08 wt% chromium and 0.03~0.07 wt% terbium ions were prepared. Presintered Y-TZP specimens were soaked in metal chloride coloring liquids for 3 minutes and sintered in air at $1,450^{\circ}C$ for 2 hours. The color of the specimens was measured with spectrophotometer and color difference (${\Delta}E^*$) was obtained based on the CIE $L^*$, $a^*$, $b^*$ color coordinate values. To evaluate the effect of metal chloride infiltration strength changes, the biaxial flexural test was performed at crosshead speed 0.5 mm/min. Colors of the sintered Y-TZP showed the colors of Vita shade guide A1, A2 and A3 with the infiltration of chromium and terbium chloride solutions. Density of the sintered Y-TZP increased by the infiltration of chromium and terbium chloride solutions. Bi-axial flexural strength of the sintered Y-TZP did not show statistically significant differences by the infiltration of chromium and terbium chloride solutions (p>0.05). Chromium and terbium chloride did not affect the crystal phase of zirconia, and all specimens showed tetragonal phase. Accordingly, this study suggests that chromium and terbium chlorides can make colored zirconia while adding in a liquid form. The color of colored zirconia differ from that of vita shade guide but it can use all ceramic restoration as substructure in dental clinic.

Oral rehabilitation of a patient with severely worn dentition using monolithic zirconia (단일구조 지르코니아 보철물을 이용한 심한 마모 환자의 전악 수복 증례)

  • Park, Jun-Seo;Ryu, Jae-Jun
    • The Journal of Korean Academy of Prosthodontics
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    • v.54 no.3
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    • pp.273-279
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    • 2016
  • Severe tooth wear may lead to pathological changes of pulp, imbalance in occlusion as well as functional and esthetic problems. In this case, 34-year-old male came to the hospital because of generally worn dentition due to attrition and erosion. After evaluation, a full mouth restoration with elevation of the vertical dimension of occlusion was planned. After occlusion was stabilized by an occlusal stabilization appliance, centric relation position was recorded and subsequent provisional restorations were fabricated. After evaluation, a CAD-CAM (computer aided design-computer aided manufacturing) prosthetic restoration was carried out using monolithic zirconia. After 12 months of follow up observation, the patient was satisfied with function and esthetic appearance.

The effet of cooling rate on the residual stresses in the veneer ceramics of zirconia-ceramic restorations: a literature review (냉각속도가 지르코니아-도재 수복물의 전장도재 내 잔류응력에 미치는 효과에 관한 문헌고찰)

  • Chang, Jea-Seung;Kim, Sunjai
    • The Journal of Korean Academy of Prosthodontics
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    • v.52 no.2
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    • pp.136-142
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    • 2014
  • Nowadays, dental zirconia is widely used as a framework material for a fixed dental prosthesis as well as a single restoration. However, clinical studies have reported high incidence of veneer chipping of zirconia-ceramic restorations compared to that of metal-ceramics. Several factors were raised as the possible causes of veneer ceramic chipping, however, it is still in debate. Recently, residual stresses in the veneer ceramics after cooling process gathers attention as one possible cause of chipping and many studies reported that the rate of cooling significantly influenced the types and the amount of residual stress. The purpose of current review was to briefly describe the effect of cooling rate on the residual stress in zirconia-ceramics. It was also described that the different behavior of residual stress between zirconia-ceramics and metal-ceramics following different cooling rate.

Maxillary complete denture with posterior zirconia occlusion and mandibular implant support fixed prostheses in completely edentulous patients with orofacial dystonia (구강안면 근긴장이상을 가진 완전 무치악 환자에서 구치부 지르코니아 교합면을 갖는 상악 총의치와 하악 임플란트 지지 고정성 보철물의 수복)

  • Jong-Min Seo;Chang-Mo Jeong;So-Hyoun Lee
    • Journal of Dental Rehabilitation and Applied Science
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    • v.39 no.4
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    • pp.237-249
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    • 2023
  • Orofacial dystonia is a neuromotor disorder that causes irregular or repetitive movements of the face, lips, tongue, and jaw involuntarily, also called tic disorder. Edentulous patients with these symptoms experience functional and aesthetic problems, including difficulty using complete dentures, speech and swallowing difficulties, and orofacial pain. In this case, for a patient with orofacial dystonia who experienced complete edentulism at a relatively young age, restorative treatment was performed with a maxillary complete denture with bilateral posterior zirconia occlusal surfaces and a mandibular implant-supported fixed prosthesis, and continuous smile training was performed. The aim was to improve the aesthetics of facial muscles. As a result of the treatment, the patient was very satisfied with not only improved chewing function and aesthetics, but also regained psychological stability and was able to lead a normal daily life, so we would like to report this.