Surface detail reproduction and dimensional stability of contemporary irreversible hydrocolloid alternatives after immediate and delayed pouring

Objetivo: O objetivo deste estudo foi realizar uma análise in vitro da estabilidade dimensional de três marcas de hidrocoloides irreversíveis: Jeltrate Plus, Hydrogum 5 e CavexColor Change. Os produtos foram submetidos a sete diferentes tempos de vazamento do molde. Materiais e métodos: Foi confeccionado um modelo padrão de acrílico com base plana e quatro pilares retos: A, B, C e D. Logo após, foram realizadas 105 moldagens, sendo 35 moldes de cada marca comercial subdivididos em sete grupos de acordo com o tempo de vazamento do molde: imediatamente após moldagem; 30 minutos; 2 horas; 24 horas; 48 horas; 120 horas; e 216 horas após a moldagem. Em seguida, os modelos tiveram a distância entre os pontos mensuradas (medidas AB, BC e CD). A análise de variância de dois fatores e o teste post-hoc de Tukey (α = 0,05) foram utilizados como testes estatísticos. Resultados: A estabilidade dimensional foi afetada diretamente em função do tempo de armazenamento e da marca do alginato (p < 0,05). O hidrocoloide Jeltrate Plus apresentou alterações crescentes em suas dimensões após 2 horas de armazenamento, enquanto o Hydrogum 5 e o Cavex Color Change mantiveram-se estáveis por 120 e 48 horas, respectivamente. Conclusão: Desde que armazenados em condições adequadas, as marcas comerciais Hydrogum 5 e Cavex Color Change apresentaram maior estabilidade dimensional.

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Avaliação da estabilidade dimensional de três marcas de hidrocoloides irreversíveis

Júnior

Nobre

Rúbio

et al. 2021

Clin Lab Res Dent

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Accuracy of Master Casts Generated Using Conventional and Digital Impression Modalities: Part 1—The Half-Arch Dimension

et al. 2021

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Accurate impression-making is considered a vital step in the fabrication of fixed dental prostheses. There is a paucity of studies that compare the casts generated by various impression materials and techniques that are commonly used for the fabrication of provisional and definitive fixed prostheses. The aim of this study is to compare the accuracy of casts obtained using conventional impression and digital impression techniques. Thirty impressions were made for the typodont model (10 impressions each of polyvinyl siloxane, alginate, and alginate alternative materials). Ten digital models were printed from the same model using a TRIOS-3 3Shape intraoral scanner. Accuracy was assessed by measuring four dimensions (horizontal anteroposterior straight, horizontal anteroposterior curved, horizontal cross-arch, and vertical). A one-way ANOVA and Tukey’s test (α = 0.05) were used to analyze data. A statistically significant difference in the four dimensions of the stone casts and digital models was observed among the four groups (exception: between alginate alternative and 2-step putty–light body impression in the horizontal anteroposterior straight, horizontal anteroposterior curved, and horizontal cross-arch dimensions; between alginate and alginate alternative in the horizontal anteroposterior curved dimension; between alginate and 2-step putty–light body impression in the horizontal anteroposterior curved dimension; and between alginate alternative and digital in the vertical dimension). Polyvinyl siloxane had the highest accuracy compared to casts obtained from other impression materials and digital impressions.

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Effect of Powder/Water Ratio Variation on Viscosity, Tear Strength and Detail Reproduction of Dental Alginate Impression Material (In Vitro and Clinical Study)

2021

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Background: Alginate impression is a common dental polymeric material, presented as powder to be mixed with water. Aim: 1. To analyze the effect of alginate powder/water ratio variation on viscosity, tear strength and detail reproduction by in vitro tests, and 2. To evaluate this variation’s effect on patients’ impressions. Materials and methods: Two commercial alginate products were mixed in different viscosities. Viscosity was measured by a viscometer. For the tear strength test, V-shaped specimens were used. For detail reproduction, a die with three scribed lines was used. Clinical dental impressions were examined by stereomicroscope. Results: The alginate specimens mixed with a higher powder/water ratio showed a higher viscosity and tear strength compared to those with a lower powder/water ratio. Both alginate mixtures reproduced two scribed lines in a detail reproduction test. On the other hand, no clear clinical difference was detected when examining dental impressions mixed with a different powder/water ratio. Conclusion: Although increasing the powder/water ratio of mixed alginate raised the resultant viscosity and tear strength by an in vitro test, clinically, no clear difference in tearing was detected. Detail reproduction was minimally affected by the variation in powder/water ratio.

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Surface detail reproduction and dimensional stability of contemporary irreversible hydrocolloid alternatives after immediate and delayed pouring

Cited by 4 publications

References 29 publications

Avaliação da estabilidade dimensional de três marcas de hidrocoloides irreversíveis

Avaliação da estabilidade dimensional de três marcas de hidrocoloides irreversíveis

Accuracy of Master Casts Generated Using Conventional and Digital Impression Modalities: Part 1—The Half-Arch Dimension

Effect of Powder/Water Ratio Variation on Viscosity, Tear Strength and Detail Reproduction of Dental Alginate Impression Material (In Vitro and Clinical Study)

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