Facial scanning accuracy depending on the alignment algorithm and digitized surface area location: An in vitro study

2021 ◽  
pp. 103680
Author(s):  
Marta Revilla-León ◽  
Jorge Alonso Pérez-Barquero ◽  
Basir A. Barmak ◽  
Rubén Agustín-Panadero ◽  
Lucía Fernández-Estevan ◽  
...  
Keyword(s):  
Surface Area ◽  
In Vitro Study ◽  
Vitro Study ◽  
Alignment Algorithm ◽  
Facial Scanning

scholarly journals Physicochemical and Biological Characterization of Ti6Al4V Particles Obtained by Implantoplasty: An In Vitro Study. Part I

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6507
Author(s):  
Jorge Toledano-Serrabona ◽  
Francisco Javier Gil ◽  
Octavi Camps-Font ◽  
Eduard Valmaseda-Castellón ◽  
Cosme Gay-Escoda ◽  
...  
Keyword(s):  
Cell Viability ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
In Vitro Study ◽  
Vitro Study ◽  
Equivalent Diameter ◽  
Metal Debris ◽  
Aluminum Ions

Implantoplasty is a mechanical decontamination technique that consists of polishing the supra-osseous component of the dental implant with peri-implantitis. This technique releases metal particles in the form of metal swarf and dust into the peri-implant environment. In the present in vitro study, the following physicochemical characterization tests were carried out: specific surface area, granulometry, contact angle, crystalline structure, morphology, and ion release. Besides, cytotoxicity was in turn evaluated by determining the fibroblastic and osteoblastic cell viability. As a result, the metal debris obtained by implantoplasty presented an equivalent diameter value of 159 µm (range 6–1850 µm) and a specific surface area of 0.3 m2/g on average. The particle had a plate-like shape of different sizes. The release of vanadium ions in Hank’s solution at 37 °C showed no signs of stabilization and was greater than that of titanium and aluminum ions, which means that the alloy suffers from a degradation. The particles exhibited cytotoxic effects upon human osteoblastic and fibroblastic cells in the whole extract. In conclusion, metal debris released by implantoplasty showed different sizes, surface structures and shapes. Vanadium ion levels were higher than that those of the other metal ions, and cell viability assays showed that these particles produce a significant loss of cytocompatibility on osteoblasts and fibroblasts, which means that the main cells of the peri-implant tissues might be injured.

scholarly journals Nyquist limit and orifice area independently affect the accuracy of proximal isovelocity surface area estimation of flow rate:An in vitro study

1990 ◽  
Vol 15 (2) ◽  
pp. A109 ◽  
Author(s):  
Leonardo Rodriquez ◽  
Joseph Anconina ◽  
Pamela Harrigan ◽  
Robert A Levine ◽  
Victor H Monterroso ◽  
...  
Keyword(s):  
Surface Area ◽  
In Vitro Study ◽  
Vitro Study ◽  
Orifice Area ◽  
Area Estimation ◽  
Proximal Isovelocity Surface Area ◽  
Nyquist Limit

scholarly journals Influence of Remineralizing Agents on the Surface Roughness of Eroded Dental Enamel: in Vitro Study

2020 ◽  
Vol 22 (2) ◽  
pp. 127-130
Author(s):  
Cesar Penazzo Lepri ◽  
Rayssa Prado Macedo ◽  
Vanessa Ferreira Marra ◽  
Gabriella Rodovalho Paiva ◽  
Denise Tornavoi de Castro ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Area ◽  
Tooth Enamel ◽  
Dental Enamel ◽  
In Vitro Study ◽  
Laser Scanning Microscopy ◽  
Vitro Study ◽  
Significant Difference ◽  
Kolmogorov Smirnov

The objective of this in vitro study was to evaluate the influence of remineralizing agents on the surface roughness of eroded tooth enamel. Forty incisive bovines were selected and sectioned to obtain specimens of 4mm X 4mm, resulting in a surface area of 16,00mm², with a thickness of 2.50mm. The specimens were immersed in lemon juice, twice a day, over 5 days, and randomly divided into the following 4 groups: G1 = No treatment; G2 = 1.23% APF; G3 = Fluoride Varnish 5% and G4 = Regenerated. The surface roughness of the specimens was analyzed by means of confocal laser scanning microscopy. The obtained data were submitted to ANOVA after attend the homogeneity (Levene´s) and normality tests (Kolmogorov-Smirnov). All tests were statistically significant at 5% (α=0.05). The results showed that there was no statistically significant difference on the enamel roughness surface area between groups in the experimental region and the founded values were higher at the experimental when compared to the control region, however, without differences between the groups in each region. It was concluded that the remineralizing agents were not able to reduce the surface roughness of the studied groups.   Keywords: Tooth Erosion. Dental Enamel. Fluorine. Tooth Remineralization. Resumo O objetivo deste estudo in vitro foi avaliar a influência de agentes remineralizantes na rugosidade da superficial do esmalte dental erodido. Quarenta bovinos incisivos foram selecionados e seccionados para obter espécimes de 4 mm x 4 mm, resultando em uma área superficial de 16,00 mm², com espessura de 2,50 mm. As amostras foram imersas em suco de limão, duas vezes ao dia, durante 5 dias, e divididas aleatoriamente nos 4 grupos seguintes: G1 = Sem tratamento; G2 = Flúor gel 1,23%; G3 = Verniz fluoretado 5% e G4 =Regenerate. A rugosidade superficial das amostras foi analisada por microscopia confocal de varredura a laser. Os dados obtidos foram submetidos à ANOVA após os testes de homogeneidade (Levene) e normalidade (Kolmogorov-Smirnov). Todos os testes foram estatisticamente significantes a 5% (α = 0,05). Os resultados mostraram que não houve diferença estatisticamente significante na rugosidade de área do esmalte entre os grupos na região experimental e os valores encontrados foram maiores na experimental quando comparados à região controle, no entanto, sem diferenças entre os grupos em cada região. Concluiu-se que os remineralizantes não foram capazes de reduzir a rugosidade da superfície dos grupos estudados. Palavras-chave: Erosão Dentária. Esmalte dentário. Flúor. Remineralização Dentária.

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