Influence of diameter on mechanical behavior of morse taper narrow implants

Dental implants could give back function, esthetics and quality of life to patients. The correct choice of the implant, especially in borderline cases, is essential for a satisfactory result. Aim: Thus, the objective of this study was to evaluate the mechanical behavior of Morse taper implants with two different prosthetic interfaces. Methods: Twenty self-locking Morse taper implants, 2.9 mm in diameter (FAC), and 20 Morse taper implants, 3.5 mm in diameter (CM) were divided into two groups (n=10), and submitted to strength to failure test, optical microscopic evaluation of fracture, metallographic analysis of the alloy, finite element analysis (FEA) and strain gauge test. A Student's t test (α = 0.05) was made for a statistical analysis. Results: For the strength to failure test, a statistically difference was observed (p <0.001) between FAC (225.0 ± 19.8 N) and CM (397.3 ± 12.5 N). The optical microscopic evaluation demonstrated a fracture pattern that corroborated with FEA ́s results. The metallographic analysis determined that the implants of the FAC group have titanium-aluminum-vanadium alloy in their composition. In the strain gauge test, there was no statistical difference (p = 0.833) between CM (1064.8 ± 575.04 µS) and FAC (1002.2 ± 657.6 µS) groups. Conclusion: Based on the results obtained in this study, ultra-narrow implants (FAC) should ideally be restricted to areas with low masticatory effort

Biomechanical behavior of extra-narrow implants after fatigue and pull-out tests.

STATEMENT OF PROBLEM: Narrow implants have limited indications, and implant fracture may occur when these indications are not followed. PURPOSE: The purpose of this in vitro study was to investigate the mechanical behavior of a 2.9-mm-diameter implant using a fatigue limit test and to investigate the Morse effect of 2 different Morse taper systems, 2.9-mm-diameter (FAC group) and 3.75-mm-diameter (CM group) implants, using a pull-out test. The null hypothesis was that the tensile strengths of the components for both systems would be similar. MATERIAL AND METHODS: The fatigue properties of 13 specimens under 6 loads were determined. The test was performed at 15 Hz and for 5×106 cycles. In the pull-out test, the specimens were divided into 2 groups (n=8), the FAC group (2.9-mm-diameter) and the CM group (3.75-mm-diameter). Statistical analysis for the pull-out test was performed with the Student t test (α=.05). RESULTS: Thirteen specimens underwent the fatigue test. Only 5 did not fail when subjected to the frequency and number of cycles examined. Three of the specimens did not fail under a load of 130 N. The pull-out test showed a significant difference between the FAC and CM groups (P<.001). CONCLUSIONS: According to the fatigue test, the extra-narrow implant (Facility; Neodent) was compatible with the low masticatory effort regions, as indicated by the manufacturer. The better performance of the FAC group in the pull-out test may be due to its design, which promotes the pure Morse effect in the implant-abutment interface, and the angulation of its internal conical portion.

Avaliação da higiene oral em prótese fixa múltipla sobre implantes expostos após necrose óssea ­ relato de caso / Evaluation of oral hygiene in multiple fixed prostheses on implants exposed after bone necrosis ­ case report

Alguns pacientes podem apresentar dificuldades motoras que inviabilizam a adequada higienização de próteses implantossuportadas. No entanto, a utilização de escovas elétricas pode compensar essas dificuldades e melhorar a qualidade de higiene oral. O presente trabalho relata um caso clínico que utilizou escova dental elétrica Philips Sonicar e AirFloss Ultra® como meio de higienização da área de implante osseointegrado exposta pós necrose óssea. Paciente dirigiu-se a um serviço de reabilitação oral com desconforto em prótese implantada ferulizada de três elementos localizada no arco inferior direito. Após análise clínica e diagnóstico, o paciente foi orientado quanto as etapas do tratamento, assim como a necessidade da manutenção dos tecidos peri-implantares através de uma correta higienização. Após um ano é possível verificar uma condição satisfatória da região avaliada e maior satisfação do paciente quanto ao método de limpeza empregado. (AU).

Some patients may present motor difficulties that prevent the adequate hygiene of implanted prosthesis. However, the use of electric toothbrushes can compensate these difficulties and improve the quality of oral hygiene. The present study reported the case of a patient who used Philips Sonicar electric brush and AirFloss Ultra® to clean an osseointegrated implant area exposed after bone necrosis. Patient went to an oral rehabilitation service with discomfort in a three-element splinted implanted prosthesis area, located in the lower right arch. After clinical analysis and diagnosis, the patient was advised on the steps of treatment as well as the necessity of the maintenance of the peri-implant tissues with a correct oral hygiene. After one year, it is still possible to verify a satisfactory condition of the evaluated region and greater satisfaction of the patient regarding the cleaning method employed. (AU).

Recursos de bioinformática aplicados às ciências ômicas como genômica, transcriptômica, proteômica, interatômica e metabolômica / Bioinformatic resources applied on the omic sciences as genomic, transcriptomic, proteomic, interatomic and metabolomic

As ciências ômicas tratam da análise global dos sistemas biológicos, integrando diferentes áreas do conhecimento, como a bioquímica, genética, fisiologia e computação, com o objetivo de isolar e caracterizar genes, proteínas e metabólitos, assim como estudar as interações entre eles, com base em técnicas experimentais, softwares e bancos de dados. A bioinformática por sua vez, propõe novas formas de ciência baseada na experimentação in silico, sendo muito dinâmica na sua atualização e fornecendo a base para geração de novos dados e conhecimentos que podem ser aplicados na pesquisa básica e na aplicada com o desenvolvimento de novos produtos e soluções. Este processo está intimamente relacionado à inovação tecnológica, que é conseguida unindo-se a biotecnologia e a bioinformática. Contudo, o objetivo desta revisão é apresentar uma pequena abordagem dos recursos de bioinformática aplicados às ciências ômicas, como genômica, transcriptômica, proteômica, interatômica, metabolômica, farmacogenômica, dentre outras.

The omic sciences had a wide point of view of the biological systems, integrating different knowledgement areas, as biochemistry, genetics and physiology, with the aim of isolation and characterization of genes, proteins and metabolites as well study their interactions, based on experimental techniques, softwares and data banks. Bioinformatics proposes a new science, which is based on in silico experimentation, being very dynamic in its update and also can provides the basis for generation of new data and knowledge that can be applied in basic research and applied to the development of new products and solutions. This process is closely related to technological innovation, which is achieved joining biotechnology and bioinformatics. However, the objective of this review is to present a small approach of bioinformatics resources applied to the omics science, like genomics, transcriptomics, proteomics, interatomics, metabolomics, pharmacogenomics, among others.