• Title/Summary/Keyword: dental prosthetic

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Number of implants for mandibular implant overdentures: a systematic review

  • Lee, Jeong-Yol;Kim, Ha-Young;Shin, Sang-Wan;Bryant, S. Ross
    • The Journal of Advanced Prosthodontics
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    • v.4 no.4
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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.

Influence of heat treatment on the microstructure and the physical and mechanical properties of dental highly translucent zirconia

  • Dimitriadis, Konstantinos;Sfikas, Athanasios Konstantinou;Kamnis, Spyros;Tsolka, Pepie;Agathopoulos, Simeon
    • The Journal of Advanced Prosthodontics
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    • v.14 no.2
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    • pp.96-107
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    • 2022
  • PURPOSE. Microstructural and physico-mechanical characterization of highly translucent zirconia, prepared by milling technology (CAD-CAM) and repeated firing cycles, was the main aim of this in vitro study. MATERIALS AND METHODS. Two groups of samples of two commercial highly-translucent yttria-stabilized dental zirconia, VITA YZ-HTWhite (Group A) and Zolid HT + White (Group B), with dimensions according to the ISO 6872 "Dentistry - Ceramic materials", were prepared. The specimens of each group were divided into two subgroups. The specimens of the first subgroups (Group A1 and Group B1) were merely the sintered specimens. The specimens of the second subgroups (Group A2 and Group B2) were subjected to 4 heat treatment cycles. The microstructural features (microstructure, density, grain size, crystalline phases, and crystallite size) and four mechanical properties (flexural strength, modulus of elasticity, Vickers hardness, and fracture toughness) of the subgroups (i.e. before and after heat treatment) were compared. The statistical significance between the subgroups (A1/A2, and B1/B2) was evaluated by the t-test. In all tests, P values smaller than 5% were considered statistically significant. RESULTS. A homogenous microstructure, with no residual porosity and grains sized between 500 and 450 nm for group A and B, respectively, was observed. Crystalline yttria-stabilized tetragonal zirconia was exclusively registered in the X-ray diffractograms. The mechanical properties decreased after the heat treatment procedure, but the differences were not statistically significant. CONCLUSION. The produced zirconia ceramic materials can be safely (i.e., according to the ISO 6872) used in extensive fixed prosthetic restorations, such as substructure ceramics for three-unit prostheses involving the molar restoration and substructure ceramics for prostheses involving four or more units. Consequently, milling technology is an effective manufacturing technology for producing zirconia substructures for dental fixed all-ceramic prosthetic restorations.

The Application of CAD/CAM in Dentistry (임상가를 위한 특집 1 - CAD/CAM 치과적 응용)

  • Choi, Ho-Sik;Moon, Ji-Eun;Kim, Sung-Hun
    • The Journal of the Korean dental association
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    • v.50 no.3
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    • pp.110-117
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    • 2012
  • Dental computer-aided design (CAD) and computer-aided manufacturing (CAM) technology have rapidly progressed over the past 30 years. The technology, which can be used in the dental laboratory, the dental office and the form of production centers, has become more common in recent years. This technology is now applied to inlays, onlays, crowns, fixed partial dentures, removable partial denture frameworks, complete dentures, templates for implant installation, implant abutments, and even maxillofacial prostheses. Dentists and dental technicians, who want to use these techniques, should have certain basic knowledge about that. This article gives an overview of CAD/CAM technologies, histories and how it applies in prosthetic dentistry.

Dental treatments for patients with severe mental challenges (임상가를 위한 특집 2 - 중증 지적 장애인을 위한 효과적인 치과치료)

  • Chang, Ju-Hea
    • The Journal of the Korean dental association
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    • v.49 no.12
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    • pp.739-748
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    • 2011
  • Patients with severe mental challenges are often subjected to extensive dental problems. Their impaired communication and lack of cooperation unable to receive timely dental treatments, which deteriorates their adverse oral conditions. In spite of a limited time frame, well-planned comprehensive treatments can be delivered in an one-day operation setting under general anesthesia. This multidisciplinary treatment regimen primarily comprises of single-visit endodontics, direct bonded restoration, periodontal treatment, and surgical extraction. Further, one or two additional visits for prosthetic procedures are able to accomplish functional reestablishment and esthetic enhancement. This article discusses on clinical managements for severely mentally challenged patients under a single-day operation.

Implant-assisted Removable Prosthetic Rehabilitation of a Patient with Crossed Occlusion

  • Oh, Hyun-Su;Lim, Young-Jun;Kim, Myung-Joo;Kwon, Ho-Beom
    • Journal of Korean Dental Science
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    • v.14 no.1
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    • pp.32-39
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    • 2021
  • 'Crossed occlusion' is the condition in which occlusal intercuspation is lost when several teeth on upper and lower jaw remain. This report describes a clinical case in which a patient had two upper-left posterior teeth and two lower-right posterior teeth; typically known as left-right crossed occlusion. Considering the patient's general condition and financial situation, the treatment plan included placement of two implants on each jaw against the remaining teeth using surgical guide. To find out the ideal position of implants, digital diagnostic wax-up was preceded by superimposing the cast and cone beam computed tomography image, which was aided with radiographic stents. The consequent surveyed implant bridge provided stable vertical stop for fabrication of the implant assisted removable partial dentures. The patient was satisfied with the functionality and esthetics of definitive prosthesis.

Prosthodontic Treatment of Persons with Disabilities Under Dental Sedation and General Anesthesia (치과진정법과 전신마취를 이용한 장애환자의 보철치료)

  • Kim, Yun-Hee;Lee, Jin-Han
    • Journal of The Korean Dental Society of Anesthesiology
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    • v.12 no.3
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    • pp.183-191
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    • 2012
  • In most persons with disabilities had poor oral hygiene because of less attention and ability to perform a dental care. So the increased prevalence and severity of dental disease were common oral state. Although most persons with disabilities need a adequate dental treatment, it is often very difficult to treat because of noncooperativity and involuntary muscle movements. Dental treatments under sedation and general anesthesia were make to provide a high-quality dental service because of decreased anxiety and fear associated dental treatment in persons with disabilities. The dental professionals must be able to select and apply the proper sedation methods in agreement with the characteristics of the disabilities, general conditions, sedation experience and capacity of dentist, type and time of dental treatment, equipments of dental clinic, consent of patient's protector. The proshodontic treatment procedures, such as abutment preparation, dental impression taking process, try-in process of prosthesis and adjustment of occlusion, are difficult even for patients without disabilities. Those procedures are more difficult to patients with disability because it's too hard to control breathing and muscle. In this report, we performed prosthetic dentistry procedures to three patients with disabilities under dental sedation and general anesthesia.

Dental infection control in clinical practice institutions experienced by dental hygiene students in the COVID-19 situation (코로나바이러스감염증-19 상황에서 임상실습 중 치위생(학)과 학생의 감염관리 인식과 치과의료기관의 감염관리 수행정도)

  • Son, Jung-hui;Jeong, Seo-young
    • Journal of Korean Academy of Dental Administration
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    • v.9 no.1
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    • pp.25-31
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    • 2021
  • The aim of this study was to investigate the level of dental infection control experienced by dental hygiene students in clinical practice institutions to identify problems and improve infection control in dental institutions. This study conducted online surveys targeting 269 dental hygiene students from universities that conducted clinical practice to determine the students' level of awareness regarding dental infection control in dental institutions and the reality of infection control in dental institutions. The results showed that dental hygiene students recognized the need for infection control and education about infection control at a high level. However, only 47% of the students were accurately informed about COVID-19. Basic instruments, periodontal instruments, and implant surgical instruments were sterilized after use for each patient, mostly by the institution, but 3-way syringe tips, preservation instruments and prosthetic instruments were more frequently reused without sterilization immediately after use. For dental infection control to be practiced at dental institutions, it is necessary to establish a systematic and safe infection control system, including infection control education, designation of infection managers, and provision of infection control guidelines.

Stability of the prosthetic screws of three types of craniofacial prostheses retention systems

  • Lanata-Flores, Antonio Gabriel;Sigua-Rodriguez, Eder Alberto;Goulart, Douglas Rangel;Bomfim-Azevedo, Veber Luiz;Olate, Sergio;de Albergaria-Barbosa, Jose Ricardo
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.42 no.6
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    • pp.352-357
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    • 2016
  • Objectives: This study aimed to evaluate the stability of prosthetic screws from three types of craniofacial prostheses retention systems (bar-clip, ball/O-ring, and magnet) when submitted to mechanical cycling. Materials and Methods: Twelve models of acrylic resin were used with implants placed 20 mm from each other and separated into three groups: (1) bar-clip (Sistema INP, São Paulo, Brazil), (2) ball/O-ring (Sistema INP), and (3) magnet (Metalmag, São Paulo, Brazil), with four samples in each group. Each sample underwent a mechanical cycling removal and insertion test (f=0.5 Hz) to determine the torque and the detorque values of the retention screws. A servo-hydraulic MTS machine (810-Flextest 40; MTS Systems, Eden Prairie, MN, USA) was used to perform the cycling with 2.5 mm and a displacement of 10 mm/s. The screws of the retention systems received an initial torque of 30 Ncm and the torque values required for loosening the screw values were obtained in three cycles (1,080, 2,160, and 3,240). The screws were retorqued to 30 Ncm before each new cycle. Results: The sample was composed of 24 screws grouped as follows: bar-clip (n=8), ball/O-ring (n=8), and magnet (n=8). There were significant differences between the groups, with greater detorque values observed in the ball/O-ring group when compared to the bar-clip and magnet groups for the first cycle. However, the detorque value was greater in the bar-clip group for the second cycle. Conclusion: The results of this study indicate that all prosthetic screws will loosen slightly after an initial tightening torque, also the bar-clip retention system demonstrated greater loosening of the screws when compared with ball/O-ring and magnet retention systems.

Prosthetic rehabilitation with digital implant planning for a minimally invasive surgery approach (디지털 임플란트 플래닝을 통한 최소침습 보철수복 증례)

  • Jeong, Areum;Lee, Younghoo;Hong, Seoung-Jin;Paek, Janghyun;Noh, Kwantae;Pae, Ahran;Kim, Hyeong-Seob;Kwon, Kung-Rock
    • The Journal of Korean Academy of Prosthodontics
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    • v.60 no.3
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    • pp.283-292
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    • 2022
  • For fixed prosthetic treatment using implants, implants must be placed in a suitable location for prosthetic treatment. During surgery, minimally invasive prosthetic restoration is possible using a flapless method using a surgical guide. The patient in this case was an 86-year-old male patient who wanted treatment due to discomfort when using conventional dentures. Due to systemic disease, the patient had difficulty using removable local dentures, so full dentures for the maxilla and fixed implants for the mandible were restored. Because there is a high risk of bleeding due to systemic disease, the implant was placed in a flapless method using a surgical guide. Finally, prostheses were fabricated with maxillary full denture and mandibular screw-retained zirconia, and this report shows satisfactory esthetic and functional recovery.

Prognosis after treatment with multiple dental implants under general anesthesia and sedation in a cerebral palsy patient with mental retardation: A case report

  • Hong, Young-Joon;Dan, Jung-Bae;Kim, Myung-Jin;Kim, Hyun Jeong;Seo, Kwang-Suk
    • Journal of Dental Anesthesia and Pain Medicine
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    • v.17 no.2
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    • pp.149-155
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    • 2017
  • Cerebral palsy is a non-progressive disorder resulting from central nervous system damage caused by multiple factors. Almost all cerebral palsy patients have a movement disorder that makes dental treatment difficult. Oral hygiene management is difficult and the risks for periodontitis, dental caries and loss of multiple teeth are high. Placement of dental implants for multiple missing teeth in cerebral palsy patients needs multiple rounds of general anesthesia, and the prognosis is poor despite the expense. Therefore, making the decision to perform multiple dental implant treatments on cerebral palsy patients is difficult. A 33-year-old female patient with cerebral palsy and mental retardation was scheduled for multiple implant treatments. She underwent computed tomography (CT) under sedation and the operation of nine dental implants under general anesthesia. Implant-supported fixed prosthesis treatment was completed. During follow-up, she had the anterior incisors extracted and underwent the surgery of 3 additional dental implants, completing the prosthetic treatment. Although oral parafunctions existed due to cerebral palsy, no implant failure was observed 9 years after the first implant surgery.