A new retaining method of cement-retained restoration with linguo-horizontal insertion of fiber post / 대한치과보철학회지

The retaining methods of implant prosthesis were classified into a screw-retained and a cement-retained type. A screw-retained prosthesis has many advantages, such as retrievability, preventing residual cement, while their disadvantages include the possibility of screw loosening and fracture, on the contrary advantages of cement-retained prosthesis are relatively low cost, but they are difficult to retrieve. To combine the advantages of both type, screw-cement retained prosthesis (SCRP) type have been introduced. But they still require ideal implant placement. So we introduce fiber post retained prosthesis without residual cement for preventing soft tissue trouble due to excessive cement.

Compressive Resistance of Abutments with Different Diameters and Transmucosal Heights in Morse-Taper Implants

The aim of this study was to evaluate the compressive resistance under oblique loads of abutments with two different diameters and transmucosal heights used for cement-retained implant-supported prostheses in Morse-taper implants. Forty Morse-taper implants were divided into four groups with different abutment sizes for cement-retained prostheses in order to perform the compressive test. The groups were divided by abutment diameter and transmucosal height as follows: Group 1: 4.5 x 2.5 mm; Group 2: 4.5 x 3.5 mm; Group 3: 3.3 x 2.5 mm; and Group 4: 3.3 x 3.5 mm. An oblique compressive loading test was performed on each sample located in a platform at 30° using a universal testing machine with a load cell of 1,000 kgf and 0.5 mm/min speed until achieving the deformation of abutment's neck. The compressive resistance and its mechanical behavior were recorded for each group and the data were analyzed using ANOVA, the Shapiro-Wilk and Scheffé tests. In addition, the detailed damage of all samples was recorded with a conventional camera linked to the endoscopic equipment. Significant differences were observed among the groups, except between Groups 2 and 3 (p>0.005). All the abutments showed permanent deformations in the upper region and at the transmucosal portion, but the threads of the screws were intact. Fractures were only identified in Groups 3 and 4. Stronger mechanical behavior and compressive resistance was observed in the abutments with 4.5 mm diameter and 2.5 mm transmucosal height.

O objetivo deste estudo foi avaliar a resistência compressiva sob carga oblíqua em pilares com dois diferentes diâmetros e alturas de transmucoso usados para prótese implanto-suportada cimentada em implantes de cone Morse. Quarenta implantes de cone morse foram divididos em quatro grupos com diferentes tamanhos de pilares para próteses cimentadas a fim de realizar o teste compressivo. Os grupos foram divididos pelo diâmetro do pilar e altura de transmucoso como segue: 1) 4,5 x 2,5 mm; 2) 4,5 x 3,5 mm; 3) 3,3 x 2,5 mm; e 4) 3,3 x 3,5 mm. Um ensaio de compressão oblíqua foi realizado em cada amostra localizada numa plataforma a 30º utilizando uma máquina de ensaios universal, com célula de carga de 1.000 kgf e 0,5 mm/min de velocidade até atingir a deformação do pescoço do pilar. A resistência compressiva e seu comportamento mecânico foram registrados para cada grupo e os dados foram analisados utilizando os testes Shapiro-Wilk, ANOVA e Scheffé. Além disso, a deformação detalhada de todas as amostras foi registrada com uma câmera convencional conectada ao equipamento endoscópico. Foram observadas diferenças significativas entre os grupos, com exceção dos Grupos 2 e 3 (p>0,005). Todos os pilares mostraram deformação permanente na região superior e na porção transmucosa; porém, as roscas dos parafusos estavam intactas. Fraturas foram apenas identificadas nos Grupos 3 e 4. Foi observado melhor comportamento mecânico e resistência compressiva nos pilares com diâmetro de 4,5mm e altura de transmucoso de 2,5mm.

Submucosal zirconia implant prosthesis fabricated with CAD/CAM / 대한치과보철학회지

They have been recently introduced many aesthetic implant prosthesis using with zirconia and CAD/CAM. However, there are many limitations in their gingival and occlusal region. In this case, submucosal zirconia implant prosthesis were fabricated with CAD/CAM system. The connection of these screw cement retained prosthesis and titanium abutment was designed to 1mm above the fixture. The clinical results were satisfactory on the aesthetics and function.

Maxillary cement retained implant supported monolithic zirconia prosthesis in a full mouth rehabilitation: a clinical report

This clinical report presents the reconstruction of a maxillary arch with a cement retained implant supported fixed prosthesis using a monolithic zirconia generated by CAD/CAM system on eight osseointegrated implants. The prosthesis was copy milled from an interim prosthesis minimizing occlusal adjustments on the definitive prosthesis at the time of delivery. Monolithic zirconia provides high esthetics and reduces the number of metal alloys used in the oral cavity.

Restaurações cimentadas versus parafusadas: parâmetros para seleção em prótese sobre implante / Cement-retained versus screw-retained restorations: selection parameters in implant-supported prosthesis

Com a previsibilidade e longevidade relacionadas à osseointegração, o tratamento com implantes dentários tornou-se uma realidade na clínica odontológica, proporcionando uma significativa melhora no restabelecimento da saúde bucal, da função e da estética nos tratamentos odontológicos. A fim de alcançar um sucesso mais duradouro da restauração protética, é de fundamental importância a seleção adequada do sistema de retenção da prótese sobre implante. Dessa forma, é imprescindível o conhecimento de fatores como a passividade na adaptação da restauração protética, aspectos oclusais, espaço interoclusal, requisitos estéticos, saúde dos tecidos moles peri-implantares, necessidade de manutenção, reversibilidade da restauração e fator financeiro, a fim de fornecer um embasamento científico suficiente aos cirurgiões dentistas para a escolha mais adequada do tipo de sistema de retenção nas mais variadas situações clínicas. Dessa forma, o objetivo do presente estudo foi discorrer, baseado na literatura, as vantagens, desvantagens, indicações, contra-indicações e dificuldades técnicas relacionadas a cada modalidade restauradora sobre implante (parafusada e cimentada).

With the previsibility and longevity related to the osseointegration, the treatment with dental implants became a reality in the dental clinic, providing a significant improvement in the restoration of the buccal health, of the function and of the aesthetics in the dental treatments. In order to reach a prosthetic restoration more successfull, it is very important the appropriate selection of the retention system of the implant-supported prosthesis. By this way, it is indispensable the knowledge of factors as the passivity in the prosthetic restoration adaptation, occlusal aspects, interocclusal space, aesthetic requirements, peri-implant soft tissue health, maintenance necessity, reversibility and financial factor, in order to provide a satisfactory scientific support to the dentists in the most appropriate retention system choice during the several clinical situations. In that way, the aim of the current study was to discourse, based on the literature, the advantages, disadvantages, indications, contraindications and technical difficulties related to each restoring modality implant-supported screwed and cemented.