Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 7 de 7
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
J Prosthet Dent ; 2020 Feb 27.
Artigo em Inglês | MEDLINE | ID: mdl-32115221

RESUMO

STATEMENT OF PROBLEM: Intraoral scanners (IOSs) have some inherent distortions caused by optical and/or software imperfections. However, how other factors such as operator experience, scan time, scanner type, and scan size influence scan accuracy is not clear. PURPOSE: The purpose of this in vitro study was to evaluate the trueness and precision of scans performed by 3 professionals with different levels of experience by using 2 IOSs. MATERIAL AND METHODS: Three operators with low, medium, and high levels of experience scanned a master model 10 times by using 2 IOSs (CEREC Omnicam; Dentsply Sirona and TRIOS 3; 3Shape), resulting in 10 standard tessellation language files for each group (N=60). Each standard tessellation language file was divided into 2 areas (prepared teeth and complete arch). Precision was evaluated by comparing the 10 scans from each examiner for each system. Trueness was evaluated by comparing each scan file with a reference scan obtained from a laboratory scanner (D2000; 3Shape). A 3D analysis software program (Geomagic Control; 3D Systems) was used to perform all the comparisons and superimpositions. The 3-way ANOVA test followed by the Tukey HSD test were used to assess precision and trueness. The 2-way ANOVA followed by the Tukey HSD test was used to assess scan time. The Pearson correlation test was performed between scan time and trueness for both scanners. An additional correlation was performed between scan time and number of images, as well as between number of images and trueness for the TRIOS 3. RESULTS: Statistically significant influences of operator (P<.001), scanner (P<.001), scan size (P<.001), operator and scan size (P<.001), and scanner and scan size (P<.001) were observed. The TRIOS 3 group reported higher precision than the CEREC Omnicam group for complete-arch scans (P<.001), although no difference was observed for scans of the prepared tooth. Medium- (P=.002) and low-experience operators (P<.001) reported lower precision for complete-arch scans performed with CEREC Omnicam when compared with TRIOS 3. The low-experience operator reported significantly worse results for complete-arch scans in comparison with the medium- (P=.008 and P<.001) and high-experience operators (P<.001 and P=.001), by using TRIOS 3 and CEREC Omnicam, respectively. Medium- and high-experience operators reported similar results among themselves. The CEREC Omnicam scanner reported lower trueness for complete-arch scans when compared with the prepared tooth (P<.001); for TRIOS 3, a difference was only observed for the low-experience operator when compared with the high-experience operator (P<.001). The CEREC Omnicam reported lower trueness than the TRIOS 3, except for the medium-experience operator with the prepared tooth scan. Comparing the trueness between operators and considering the same scanner and scan size, all groups were similar. The low-experience operator had a longer scanning time than the medium- and high-experience operators. For TRIOS 3, the low-experience operator obtained the highest number of images during each scan. CONCLUSIONS: The accuracy of intraoral scans was influenced by operator experience, type of IOSs, and scan size. More experienced operators and smaller scan sizes made for more accurate scans. In addition, more experienced operators made faster scans, and the TRIOS 3 was more accurate than the CEREC Omnicam for complete-arch scans.

2.
Prótesenews ; 5(4): 400-411, out.-dez. 2018. ilus
Artigo em Português | BBO - Odontologia | ID: biblio-966444

RESUMO

Paciente apresentava dentes 12 e 22 com formatos conoides e restaurações insatisfatórias, os demais dentes eram hígidos e apresentavam formato natural. Assim, o tratamento adotado foi a remoção das restaurações insatisfatórias associada a preparos minimamente invasivo e laminados confeccionados com cerâmica feldspática nos dentes 12 e 22. As restaurações em resina composta apresentavam proporções e anatomias adequadas, adotando-as como guia para os preparos dentais. Inicialmente, foram utilizadas brocas diamantadas em alta rotação para o preparo inicial e, em seguida, pontas ultrassônicas para remoção da resina composta e finalização dos preparos. Realizou-se a moldagem com silicone de adição e os laminados cerâmicos foram confeccionados pela técnica da aplicação sobre troquel refratário. Clinicamente, realizou-se a prova das cerâmicas e a cimentação após aprovação da paciente. A fase da cimentação seguiu o seguinte protocolo: isolamento absoluto, profilaxia dos preparos dentais, condicionamento ácido e aplicação de sistema adesivo. As superfícies internas dos laminados foram condicionadas e então aplicados silano e sistema adesivo. A resina composta foi aquecida e inserida na superfície dos laminados, que foram posicionados sobre os preparos dentais com o auxílio do instrumento ultrassônico até a sua posição final. Após a remoção dos excessos, realizou-se a fotopolimerização do conjunto, polimento da interface adesiva, ajustes oclusais e polimentos finais. O caso foi realizado com acompanhamento clínico e radiográfico de 12 meses, e favorável prognóstico. (AU)


This patient had conoid teeth at the 12 and 22 positions with unsatisfactory restorations. The remaining teeth were healthy. Thus, the treatment adopted was the removal of the restorations associated with minimally invasive preparations and feldspathic ceramics on tooth numbers 12 and 22. The restorations in composite resin had adequate proportions and anatomy, adopting them as a guide for dental preparations. Initially, diamond burs were used in high-rotation speed for the initial preparation, and then ultrasonic tips for removal of the composite resin and finalization. An impression was carried out with addition silicone and the ceramic laminates made using the refractory die technique. Clinically, the ceramics were tried-in and cemented after patient approval. The cementation phase was made as the following: rubber dam isolation, prophylaxis, acid etching and adhesive application. The inner laminate surfaces were conditioned, silanated, and received the adhesive system. The composite resin was heated and inserted into the laminates, which were placed on the dental preparations with the the ultrasonic instrument to their final position. After excess removal, photactivation was made and the adhesive interface was polished, followed by occlusal adjustments and fi nal polishing. After clinical and radiographic follow-up of 12 months, a favorable prognosis was observed. (AU)


Assuntos
Adulto , Resinas Compostas , Preparo do Dente , Facetas Dentárias , Estética Dentária , Preparo do Dente/métodos
3.
Prótesenews ; 5(1): 42-56, jan.-mar. 2018. ilus
Artigo em Português | BBO - Odontologia | ID: biblio-906306

RESUMO

Procedimentos como aumento de coroa clínica e/ou laminados cerâmicos são utilizados para reabilitação de pacientes que possuem coroa clínica curta, espaços interdentais na região anterior e situações que prejudiquem a estética do sorriso. O objetivo deste trabalho é apresentar uma sequência clínica para a reabilitação estética na região anterior por meio de aumento de coroa clínica associado a laminados cerâmicos, utilizando um protocolo previsível para o planejamento reabilitador. Foi realizada a anamnese, a confecção de modelos de gesso e a sequência fotográfica para o planejamento digital. Foram utilizadas as ferramentas do Digital Smile Design e transferido para o modelo de gesso por meio do enceramento progressivo. Guias de silicone para prova em boca foram confeccionados, e após a aprovação do paciente foi realizado o aumento de coroa clínica seguindo o mock-up como guia cirúrgico. Após a cicatrização, novos modelos de gesso foram confeccionados para o planejamento dos laminados cerâmicos. O mock-up foi testado novamente em boca e, após a aprovação do paciente, os mínimos desgastes necessários foram realizados. A arcada superior foi moldada com silicone de adição para obtenção de modelos de trabalho e confecção dos laminados cerâmicos, que foram cimentados após a aprovação do paciente. Este trabalho apresenta uma sequência simples para a reabilitação estética anterior, utilizando o planejamento digital e o aumento de coroa clínica associados com laminados cerâmicos.


Procedures such as clinical crown augmentation and ceramic laminate products are used for rehabilitation of patients who have short clinical crown, interdental spaces in the anterior region, or are dissatisfied with the aesthetics of their smile. The objective of this clinical work is to present an esthetic rehabilitation in the anterior region by means of increase of clinical crown surgery and ceramic laminates, using a preventive protocol for the planning of the clinical case. Patient anamnesis, dental casts, and photo analysis were made for digital planning. The DSD tools were transferred to the dental casts through the progressive waxing technique. Also, silicone keys were fabricated, and upon patient approval, clinical crown lengthening was performed with the mock-up as the surgical guide. After tissue healing, new dental casts were made to plan the ceramic laminates. Again, the mock-up was tried in the mouth and after patient approval, minimal tooth preparations were made. An impression of the maxillary arch was made with addition silicone to obtain the working casts and to fabricate the ceramic restorations, which were delivered and cemented after patient approval. This paper presents a simple and easy sequence to rehabilitate the esthetic aspect in the anterior upper region using the digital planning and crown lengthening associated to the ceramic laminates.


Assuntos
Humanos , Feminino , Adulto , Desenho Assistido por Computador , Facetas Dentárias , Estética Dentária , Técnicas de Retração Gengival , Coroa do Dente/cirurgia
4.
Braz. j. oral sci ; 16: e17058, jan.-dez. 2017. ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-883731

RESUMO

Abstract: Microscopic measurements are widely used in scientific research and the correct equipment to perform these evaluations could be critical to determine study results. Regarding microscopic measurements, three of the most used methods are: Optical Microscopy (OM), Scanning Electron Microscopy (SEM), and Micro-computed Tomography (MCT). It is important to select the best method for assessing diverse parameters, considering operational characteristics of the method, the equipment efficiency, and the machinery cost. Aim: Therefore, the main objective of this study was to define which is the most useful measurement method for assessing magnitudes below 0.4 mm. Methods: Ten dental implants, with known dimensions as defined by the manufacturer were randomly distributed. Two blinded observers assessed the distance between the second and the third screw vortex of the implants using three suggested methods. The true distance was defined to be 0.5 mm. Results: The assessed distances were: 0.597±0.007mm for OM, 0.578±0.017mm for SEM, and 0.613±0.006mm for MCT. The assessed distances were significantly different when the methods were compared (P>0.01). All measurements were into the CAD tolerances. Conclusion: It was possible to conclude that linear easurements between 595 and 605 µm could be performed by any of the described technologies (AU)


Assuntos
Implantes Dentários , Medidas, Métodos e Teorias , Microscopia Eletroquímica de Varredura/métodos , Microscopia/métodos , Microtomografia por Raio-X/métodos
5.
Gen Dent ; 65(1): e14-e16, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28068275

RESUMO

The aim of this study was to evaluate the influence of abutments with a prosthetic index on the fracture resistance of Morse taper dental implants. Morse taper implants were divided into 2 groups (n = 5 per group): a group with an indexed implant and a nonindexed abutment (solid Morse taper universal post; WIS group), and a group with an indexed implant and an indexed abutment (WIP group). Both groups were subjected to bending tests for fracture strength until 5 mm of displacement or implant fracture occurred. Statistical analysis was performed using the Student t test (α = 0.05). There was no statistically significant difference between the mean fracture values, which were 305.8 N and 318.6 N for the WIS group and WIP group, respectively. The presence of a prosthetic index on Morse taper abutments did not influence the resistance to fracture.


Assuntos
Dente Suporte , Implantes Dentários , Falha de Restauração Dentária , Dente Suporte/normas , Projeto do Implante Dentário-Pivô/normas , Implantes Dentários/normas , Análise do Estresse Dentário , Humanos
6.
Prosthes. Lab. Sci ; 6(21): 52-57, 2016. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: biblio-837403

RESUMO

Os componentes dinâmicos surgiram como alternativa para reabilitar implantes inclinados em até 20°, possibilitando o restabelecimento da estética, função e reduzindo os custos do procedimento. Sendo assim, o objetivo deste trabalho é apresentar um relato de caso utilizando esses componentes. Durante o exame clínico foi diagnosticado que os implantes apresentavam profundidade gengival rasa, inclinação e paralelismo desfavoráveis. Dessa forma, foi optado pela utilização de pilares retos com componentes dinâmicos, que irão corrigir a inclinação do orifício de acesso do parafuso da prótese definitiva.


Dynamic components were created as an alternative to rehabilitate tilted implants until 20º angled. This component allows aesthetic and function rehabilitation with lower cost comparing to angled abutments. The aim of this study was to present a case report us-ing these dynamic components. The patient presented tilted implants with gingival shallow depth, with unfavourable parallelism. Thus, straight abutment and dynamic components were concomitantly used to correct the access screw hole inclination of final the prosthesis.


Assuntos
Humanos , Pessoa de Meia-Idade , Implantes Dentários , Prótese Dentária Fixada por Implante , Estética Dentária , Reabilitação Bucal/métodos , Ajuste Oclusal/métodos , Dimensão Vertical
7.
Implant Dent ; 24(5): 547-51, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26068320

RESUMO

PURPOSE: To evaluate the influence of Morse taper implant index on microleakage. MATERIALS AND METHODS: Thirty implants and abutments were divided into 3 groups (n = 10): CM1 (universal post and implant without index), CM2 (universal post and implant with index), and CM3 (abutment and implant with index). To evaluate the microleakage from the implant inner part, the implants were inoculated with Streptococcus sanguinis solution at a 0.5 McFarland and incubated for 7 days at 37°C in Eppendorf tubes with sterile broth. To evaluate the microleakage into the inner part of implant, these were inoculated with sterile Schaedler broth and immersed in a Fusobacterium nucleatum solution at a 0.5 McFarland. The samples were incubated for 30 days in an anaerobic chamber. RESULTS: Nine samples of each group of the first methodology showed no presented bacterial contamination. No samples of the second methodology demonstrated turbidity of the broth. CONCLUSION: The presence of the prosthetic internal index had no influence on bacterial microleakage of Morse taper implants under static conditions, for both methodologies.


Assuntos
Projeto do Implante Dentário-Pivô/efeitos adversos , Implantes Dentários/microbiologia , Infiltração Dentária/microbiologia , Contaminação de Equipamentos , Fusobacterium nucleatum/metabolismo , Humanos , Técnicas In Vitro , Streptococcus sanguis/metabolismo , Microtomografia por Raio-X
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA