The effect of pouring time on the dimensional stability of casts made from conventional and extended-pour irreversible hydrocolloids by 3D modelling

Gümüş, Hasan; Dinçel, Mehmet; Büyük, Süleyman Kutalmış; Kılınç, Halil İbrahim; Bilgin, Mehmet Selim; Zortuk, Mustafa

doi:10.1016/j.jds.2014.05.003

Cited by 10 publications

(12 citation statements)

References 37 publications

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“…Os grupos 48 h, 72 h, 96 h e 120 h, embora dimensionalmente mais instáveis que o grupo controle 0 h e o grupo 24 h, apresentaram valores dentro da margem preconizada pela ISO 21563:2013 12 , indicando que os mesmos podem ser armazenados por cinco dias desde que a umidade esteja controlada, corroborando com os achados de diversos estudos [19][20][21][22] .…”

Section: Discussionunclassified

Estabilidade dimensional de moldes obtidos com alginato de armazenamento tardio

Calmon

Relvas

Lefrançois

et al. 2019

Rev. odontol. UNESP

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Resumo Introdução Recentemente, vêm surgindo no mercado alguns alginatos de armazenamento prolongado. Não há, no entanto, um consenso na literatura a respeito da estabilidade dimensional destes materiais durante este armazenamento Objetivo Avaliar, por meio de método prático experimental, a estabilidade dimensional de um alginato de armazenamento tardio. Material e método O material de moldagem utilizado foi o alginato Hydrogum 5 (Zhermack). Uma matriz metálica cilíndrica foi utilizada para a realização das moldagens, com 38 mm de diâmetro externo, 30 mm de diâmetro interno e cuja superfície superior apresenta três linhas paralelas entre si com 25 mm de comprimento e 20, 50 e 75 µm de largura. Após o tempo de geleificação do material de moldagem, 16 moldes foram colocados em um umidificador e essas amostras foram fotografadas utilizando-se uma câmera digital (Canon EOS Rebel 3Ti, Canon) associada a um software para análise das imagens obtidas (ImageJ 1.52a, U.S. National Institutes of Health; DI). A calibragem da régua foi 10 cm e, posteriormente, três linhas foram medidas três vezes, para se obter uma média dos comprimentos das linhas. As amostras foram fotografadas nos seguintes intervalos: imediatamente, 24, 48, 72, 96 e 120 horas. Resultado Os dados mostraram diferenças estatisticamente significantes para o fator tempo quando comparada a leitura imediata com os demais períodos de tempo de leitura (p<0,001) e quando comparada a leitura após 24 h de armazenagem com os demais períodos de tempo (p<0,001). Não houve diferença estatística (p>0,05) quando os tempos de armazenamento de 48 h, 72 h, 96 h e 120 h foram comparados entre si. Todos os valores encontravam-se dentro dos valores preconizados pela ISO 21563:2013. Conclusão Os moldes dos alginatos testados podem ser armazenados por até cinco dias em 100% de umidade relativa.

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Section: Discussionunclassified

Estabilidade dimensional de moldes obtidos com alginato de armazenamento tardio

Calmon

Relvas

Lefrançois

et al. 2019

Rev. odontol. UNESP

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“…Thus, it is difficult to compare the results of this study with other studies. Despite the lack of standardization in the storage temperatures of the molds, there is a consensus that thermal change is a relevant factor in the evaluation of the dimensional stability of impression materials [1,4,5,[8][9][10]20].…”

Section: Discussionmentioning

confidence: 99%

“…In this way, it would be ideal that the alginate molds presented adequate dimensional stability even with the extended-pour of the stone casts. Extended-storage alginates have become commercially available and the mold could be stored for up to 5 days [2,4,6,[8][9][10]. However, there is still not a consensus in the scientific literature whether these molds can be stored for a period of 5 days without any problem in dimensional stability or details reproduction, according to the International Organization for Standardization (ISO 1563:1990) [11].…”

Section: O R I G I N a L A R T I C L Ementioning

confidence: 99%

Evaluation of dimensional stability and details reproduction of alginate molds storage in different times and temperature

Penfold

Brandt

Miranda

et al. 2018

BDS

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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. KeywordsDental impression materials; Dimensional measurement accuracy; Shrinkage.

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“…Several studies have been conducted to measure the accuracy of these devices, and the measurement of working models with calipers is assumed to be the standard. These measurements have been compared with digital measurements …”

Section: Discussionmentioning

confidence: 99%

Fabricating Complete Dentures with CAD/CAM and RP Technologies

Bilgin

Erdem

Ağlarcı

et al. 2015

Journal of Prosthodontics

100

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Two techological approaches for fabricating dentures; computer-aided design and computer-aided manufacturing (CAD/CAM) and rapid prototyping (RP), are combined with the conventional techniques of impression and jaw relation recording to determine their feasibility and applicability. Maxillary and mandibular edentulous jaw models were produced using silicone molds. After obtaining a gypsum working model, acrylic bases were crafted, and occlusal rims for each model were fabricated with previously determined standard vertical and centric relationships. The maxillary and mandibular relationships were recorded with guides. The occlusal rims were then scanned with a digital scanner. The alignment of the maxillary and mandibular teeth was verified. The teeth in each arch were fabricated in one piece, or set, either by CAM or RP. Conventional waxing and flasking was then performed for both methods. These techniques obviate a practitioner's need for technicians during design and provide the patient with an opportunity to participate in esthetic design with the dentist. In addition, CAD/CAM and RP reduce chair time; however, the materials and techniques need further improvements. Both CAD/CAM and RP techniques seem promising for reducing chair time and allowing the patient to participate in esthetics design. Furthermore, the one-set aligned artificial tooth design may increase the acrylic's durability.

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The effect of pouring time on the dimensional stability of casts made from conventional and extended-pour irreversible hydrocolloids by 3D modelling

Cited by 10 publications

References 37 publications

Estabilidade dimensional de moldes obtidos com alginato de armazenamento tardio

Estabilidade dimensional de moldes obtidos com alginato de armazenamento tardio

Evaluation of dimensional stability and details reproduction of alginate molds storage in different times and temperature

Fabricating Complete Dentures with CAD/CAM and RP Technologies

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