Evaluation of dimensional stability and details reproduction of alginate molds storage in different times and temperature [Avaliação da estabilidade dimensional e reprodução de detalhes de moldes de alginatos armazenados por diferentes tempos e temperatura]

• Author(s): Penfold, Rafael da Rocha Santos ; Brandt, William Cunha ; Miranda, Milton Edson ; Vitti, Rafael Pino
• Date: 2019
• Origin: Oasisbr
• Subject(s): Dental impression materials; Dimensional measurement accuracy; Shrinkage
• Document Type: Journal article
• Language: English

Description

Made available in DSpace on 2019-09-11T20:51:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2018

Objetivo: O objetivo deste estudo foi avaliar a estabilidade dimensional e a reprodução detalhada de moldes de alginato armazenados em diferentes épocas e temperaturas. Material e Métodos:Três alginatos diferentes disponíveis comercialmente (Cavex Color Change, Jeltrate Plus e Hydrogum 5) foram testados em quatro momentos diferentes (0 - controle, 1, 3 e 5 dias) e duas temperaturas (25ºC e 37ºC) (n = 5). Os alginatos foram manipulados seguindo as instruções do fabricante. Os procedimentos de impressão ocorreram em ambiente com temperatura ambiente controlada (25ºC) e umidade relativa (50 ± 5%). Um modelo metálico (ISO 1563: 1990) foi usado para realizar as impressões. A bandeja contendo alginato permaneceu no modelo metálico sob pressão constante (2 kgf) até o processo de gelificação do alginato. Os moldes foram armazenados (diferentes tempos e temperaturas) e analisados ​​em estereomicroscópio com ampliação de 30x e precisão de 0,5 μm (Olympus Measuring Microscope STM). Os moldes e as medidas do modelo metálico foram comparados,Resultados: Os resultados não mostraram interações duplas (p> 0,05) e os diferentes alginatos apresentaram valores estatisticamente semelhantes de estabilidade dimensional (p = 0,102). Entretanto, 25ºC (temperatura) e grupo controle (tempo) apresentaram os maiores valores de estabilidade dimensional (p <0,05). Jeltrate Plus foi o único material que apresentou imprecisão na reprodução dos detalhes. Conclusão : Recomenda-se que, para os alginatos testados, os moldes de pedra sejam vazados imediatamente, mesmo que os moldes sejam dimensionalmente estáveis ​​por até 5 dias quando armazenados a 25ºC.

Objective: The aim of this study was to evaluate dimensional stability and detail reproduction in alginate molds stored at different times and temperatures. Material and Methods: Three different commercially available alginates (Cavex Color Change, Jeltrate Plus and Hydrogum 5) were tested at four different times (0 - control, 1, 3 and 5 days) and two temperatures (25ºC and 37ºC) (n=5). The alginates were handled following the manufacturer’s instructions. The impression procedures occurred in an environment with controlled room temperature (25ºC) and relative humidity (50±5%). A metallic model (ISO 1563:1990) was used to perform the impressions. The tray containing alginate remained on the metallic model under constant pressure (2 kgf) until the alginate gelation process. The molds were stored (different times and temperatures) and analyzed in stereomicroscope at 30x magnification and 0.5 μm accuracy (Olympus Measuring Microscope STM). The molds and the metallic model measurements were compared, and the data were statistically analyzed by Kolmogorov-Smirnov and three-way ANOVA tests, and the means were compared by Tukey test (5%). Results: The results showed no double interactions (p>0.05) and the different alginates presented statistically similar values of dimensional stability (p=0.102). However, 25ºC (temperature) and control group (time) showed the highest values of dimensional stability (p<0.05). Jeltrate Plus was the only material that presented inaccuracy in details reproduction. Conclusion: It is recommended that, for tested alginates, the stone casts should be poured immediately, even though the molds are dimensionally stable up to 5 days when stored at 25ºC. © 2018, Universidade Estadual Paulista, Institute of Science and Technology of Sao Jose dos Campos. All rights reserved.

Penfold, R.R.S., Department of Prosthodontics, School of Dentistry, São Leopoldo Mandic, Campinas, SP, Brazil

Brandt, W.C., Department of Implantology, School of Dentistry, University of Santo Amaro, São Paulo, Brazil

Miranda, M.E., Department of Prosthodontics, School of Dentistry, São Leopoldo Mandic, Campinas, SP, Brazil

Vitti, R.P., Department of Prosthodontics, School of Dentistry, University of Taubaté, Taubaté, SP, Brazil