• Title/Summary/Keyword: monolithic zirconia

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Reconstruction of implant prostheses under infraocclusion: a case report (저위교합된 임플란트 보철물 재수복 증례)

  • Kim, Joohyung;Paek, Janghyun;Noh, Kwantae;Kim, Hyeong-Seob;Woo, Yi-Hyung
    • The Journal of Korean Academy of Prosthodontics
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    • v.54 no.1
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    • pp.28-34
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    • 2016
  • Implant has been an effective treatment option for the patients with oligodontia. However, it still remains unclear when the implant should be placed. Skeletal growth that can appear even after the growth period can lead to infraocclusion of the implant which can cause functional or esthetic complications. In order to minimize these problems, definitive restorations should be placed after the functional and esthetic rehabilitation is achieved through the use of provisional restorations. Definitive restorations made with monolithic zirconia were created by replicating provisional restorations by using the latest CAD/CAM technology. These definitive restorations were delivered to the patient and clinical observation after the treatment showed satisfactory result.

The effect of thermo-mechanical fatigue on the retentive force and dimensional changes in polyetheretherketone clasps with different thickness and undercut

  • Guleryuz, Aysegul;Korkmaz, Cumhur;Sener, Ayse;Tas, Mehmet Ozan
    • The Journal of Advanced Prosthodontics
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    • v.13 no.5
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    • pp.304-315
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    • 2021
  • PURPOSE. Esthetic expectations have increased the use of polyetheretherketone (PEEK) clasps as alternatives to Cr-Co in removable partial dentures (RPDs). The objective of this study was to evaluate the retentive force and dimensional change of clasps with different thickness and undercut made from PEEK by the thermo-mechanical fatigue. MATERIALS AND METHODS. PEEK clasps (N = 48) with thicknesses of 1 or 1.50 mm and 48 premolar monolithic zirconia crowns with undercuts of 0.25 mm or 0.50 mm were fabricated. Samples are divided into four groups (C1-C4) and were subjected to 7200 thermal aging cycles (at 5 - 55℃). The changes in the retentive force and dimensions of the clasps were measured by micro-stress testing and micro-CT devices from five measurement points (M1 - M5). One-way ANOVA, paired t-test, two-way repeated ANOVA, and post-hoc tests were used to analyze the data (P < .05). RESULTS. The retentive forces of C1, C2, C3, and C4 groups in initial and final test were found to be 4.389-3.388 N, 4.67 - 3.396 N, 5.161 - 4.096 N, 5.459 - 4.141 N, respectively. The effects of retentive force of all PEEK clasps groups were significant decreased. Thermo-mechanical cycles caused significant dimensional changes at points with M2, M4, and M5, and abraded the clasp corners and increased the distance between the ends of the clasp, resulting in reduced retentive forces (P* = .016, P* = .042, P < .001, respectively). CONCLUSION. Thermo-mechanical aging decreases the retentive forces in PEEK clasps. Increasing the thickness and undercut amount of clasps decreases the amount of dimensional change. The values measured after aging are within the clinically acceptable limits.

Full mouth rehabilitation of the patient with severely worn dentition and limited vertical dimension (심한 치아 마모와 수복공간 부족을 보이는 환자에서의 완전 구강회복 증례)

  • Yang, Min-Seong;Kim, Seong-Kyun;Heo, Seong-Joo;Koak, Jai-Young;Park, Ji-Man;Yi, Yu-Seung
    • The Journal of Korean Academy of Prosthodontics
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    • v.60 no.1
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    • pp.91-99
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    • 2022
  • Severely worn dentition causes various complications such as loss of tooth structure, discoloration, pulp complications and loss of function and aesthetics. In this case, the patient showed particularly severe attrition in the anterior teeth and lack of space for restoration. The amount of vertical dimension was determined based on the diagnostic wax up, and the patient's adaptation was evaluated by using a removable occlusal splint for 6 weeks. Thereafter, the coordination of the muscular nervous system, aesthetics, temporomandibular joint were re-evaluated for 3 months by restoring the fixed provisional restoration. Through the above treatment process, the final restoration was completed with full mouth fixed prosthesis using monolithic zirconia, and functionally and aesthetically stable results were obtained.

Complete mouth rehabilitation with fixed implant-supported prosthesis using temporary denture and dental CAD-CAM (완전 무치악 환자에서 임시 의치와 치과용 CAD-CAM을 활용한 전악 고정성 임플란트 회복 증례)

  • Jeon, Sol;Yoon, Hyung-In;Lee, Jae-Hyun;Yeo, In-Sung Luke;Han, Jung-Suk
    • The Journal of Korean Academy of Prosthodontics
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    • v.60 no.1
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    • pp.100-109
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    • 2022
  • Installation of dental implants at optimal angles and positions is critical in long-term stable implant-supported restorations. Surgery and prosthodontic procedures should be performed accurately as the treatment is planned. In this clinical case, Computer aided design and manufacturing technology was used not only to establish a precise surgical plan, but also to fabricate both provisional and definitive fixed prostheses. A surgical guide was designed to install the implants at proper positions for the definitive prostheses. The patient's esthetic information, which was necessary for the new provisional and definitive fixed prostheses, was obtained from the existing temporary dentures. Finally, the complete mouth fixed implant-supported rehabilitation using monolithic zirconia provided the patient with functionally and esthetically satisfactory prostheses.

Oral rehabilitation of a patient with collapsed occlusal plane resulting from loss of posterior teeth (구치부 상실로 인해 교합 평면이 기울어진 환자에서 임플란트를 이용한 구강 회복 증례)

  • Jinwoo Han;Jae-Seung Chang;Se-Wook Pyo;Sunjai Kim
    • The Journal of Korean Academy of Prosthodontics
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    • v.62 no.2
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    • pp.165-173
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    • 2024
  • Restoring lost teeth is very important in terms of both function and aesthetics. If tooth loss occurs in the posterior region and the loss of support is persistent, it may cause a gradual shift in the position of the mandible and a change in occlusion. This clinical case attempted to restore support for the posterior teeth with a fixed prosthesis using implants in a patient whose opposing teeth were erupted and the occlusal plane collapsed due to long-term loss of the maxillary left posterior teeth and mandibular right first molars. To correct the occlusal plane of remaining dentition, wax-up of maxillary left posterior teeth was duplicated with acrylic resin and placed on maxilla. Surgical template for implant placement were fabricated using digital technology. After the support of the posterior teeth was restored with the placement of the implant, stable occlusion with temporary restorations was observed for a sufficient time. Afterwards, monolithic zirconia prosthesis was placed on the patient to ensure functional and aesthetic improvement.

Influence of crown-to-implant ratio of short vs long implants on implant stability and marginal bone loss in the mandibular single molar implant (하악 구치 단일임플란트 수복에서 임플란트 길이에 따른 치관-임플란트 비율이 임플란트안정성 및 변연골소실에 주는 영향)

  • Baek, Yeon-Wha;Kim, Bongju;Kim, Myung-Joo;Kwon, Ho-Beom;Lim, Young-Jun
    • Journal of Dental Rehabilitation and Applied Science
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    • v.34 no.4
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    • pp.280-289
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    • 2018
  • Purpose: The purpose of this randomized clinical trial is to determine whether implant length and the crown-to-implant (C/I) ratio influence implant stability and peri-implant marginal bone loss (MBL). Materials and Methods: 46 patients with single tooth missing in the posterior molar region of the mandible were included in this study. 19 implants (CMI IS-III $active^{(R)}$ long implant) of 5.0 mm diameter and 10 mm length were installed for the control group, while 27 implants (CMI IS-III $active^{(R)}$ short implant) of 5.5 mm diameter and 6.6, 7.3 or 8.5 mm length were placed for the experimental group. Each implant was inserted and immediately loaded using the digitally pre-fabricated surgical template and provisional restoration. The CAD-CAM monolithic zirconia crown was fabricated at 3 months after the surgery as a definitive restoration. The ISQ value and the MBL was measured at 48 weeks after the surgery. The correlation between the C/I ratio, MBL, and secondary implant stability was analyzed. Results: Successful results in terms of ISQ and MBL were achieved with both groups. There was no significant difference between the groups in terms of ISQ values and MBL at 48 weeks after the surgery (P > 0.05). No significant correlation was found between the C/I ratio and secondary stability as well as the C/I ratio and the MBL (P > 0.05). Conclusion: The influence of C/I ratio in both groups was not shown on the stability nor the marginal bone loss in implants supporting single crown of the mandible. Short implant could be a preferable alternative option in the reduced bone height mandible under the limited condition despite its higher C/I ratio.