Evaluation of color stability of different temporary restorative materials

Abstract

ResumoIntrodução: Os materiais restauradores provisórios são amplamente utilizados, porém pouco se sabe a respeito de sua estabilidade de cor. Objetivo: Avaliar a estabilidade de cor de materiais restauradores provisórios: resina acrílica e resinas bisacrílicas, após a imersão em soluções pigmentantes, durante diferentes períodos de armazenamento. Material e método: Quatro materiais foram testados (Dêncor/Clássico, Protemp 4/3M ESPE; Structur 2 SC/Voco; Luxatemp AM Plus/DMG) sendo confeccionadas 30 amostras (15 mm de diâmetro e 2 mm de espessura) por material. Estes foram divididos de acordo com o meio de imersão (saliva artificial, saliva + refrigerante tipo cola e saliva + café) e período de armazenamento (2, 5, 7 e 15 dias). As mensurações de cor foram realizadas antes e após as imersões, com auxílio de um espectrofotômetro, através do sistema CIE L*a*b*. Os dados foram analisados com análise de variância (ANOVA) e Tukey, com nível de significância à 5%. Resultado: A resina acrílica apresentou maior estabilidade de cor quando comparada às resinas bisacrílicas (p<0,001). Comparando as resinas bisacrílicas, não foi observado diferença significativa entre as resinas Structur e Luxatemp (p=0,767). Em relação as soluções testadas, o café apresentou os maiores valores de alteração de cor (p<0,001), sendo que quanto maior o período de armazenamento, maior foi a alteração de cor de todos os materiais provisórios analisados (p<0,001). Conclusão: A resina acrílica apresentou maior estabilidade de cor, quando comparada às bisacrílicas. O café causou a maior alteração de cor, e o tempo de imersão foi determinante na estabilidade de cor dos materiais provisórios analisados. Descritores:Restauração dentária temporária; cor; prótese dentária. AbstractIntroduction: Temporary restorative materials are widely used, however, little is know about their color stability. Objective: to evaluate the color stability of the following temporary restorative materials: acrylic and bis-acrylic resins after immersion in pigmenting solutions for different periods of storage. Material and method: Four materials were tested (Dêncor/Clássico, Protemp 4/3M ESPE; Structur 2 SC/Voco; Luxatemp AM Plus/DMG) and 30 test specimens (15 mm in diameter and 2 mm thick) per material were fabricated. They were divided according to the storage medium (artificial saliva, saliva + cola type soda, and saliva + coffee) and storage time intervals (2, 5, 7 and 15 days). Color measurements were made before and after immersions, with use of a spectrophotometer, by means of the CIE L*a*b* system. The data were analyzed by the analysis of variance and the Tukey Test, at a level of significance of 5%. Result: Acrylic resin presented greater color stability in comparison with bis-acrylic resins (p<0.001). When bis-acrylic resins were compared no significant difference was observed between the resins Structur and Luxatemp (p=0.767). As regards solutions tested, coffee showed the highest color change values (p<0.001), and the longer the storage time interval, the greater...

Surface roughness and color stability of 3D printed temporary crown material in different oral media (In vitro study)

“…Adjusting the printing process parameters also was carried out (Build height: 10 mm, layer count: 296). The STL file was sent to the Rapidshape D30 printer figure (1).…”

“…It is important to select a temporary material with greater color stability and resistance to different pigmenting liquids to which they are subjected, with the purpose of optimizing the esthetics of the restorations made. Even during the time when temporary restorations are being present in the mouth, esthetics is important [1] . Discoloration of temporary materials for fixed prosthodontics ay result in patient dissatisfaction and additional expense for replacement.…”

Effect of different polishing time on the color stability of provisional materials: An In vitro study

“…[15] The need for a design protocol of polishing is required because there is no consensus regarding time and color stability after polishing. [7,16] Most studies [11,12] recommended the diamond polishing paste with a goat hairbrush on a constant rotation of 18,000 rpm for 1 min. Şen, [12] in 2002, recommended polishing at a rotational speed of 5000 rpm for 30 s with rag wheels [12] and a moist muslin wheel for 2 min.…”

Coloration of provisional restoration materials: a comparison of the effects of mouth rinses and green tea

“…Discoloration in the provisional restorations that have been used for very long in the anterior region, where aesthetics is of paramount importance, is known to adversely affect both quality of the restoration and patient satisfaction (8). Provisional restorative materials to be used should possess colour stability and resistance to discoloration in the oral cavity as far as diverse drinks and teeth-cleansing solutions are concerned (9, 10). Today, polyvinyl methacrylate, urethane dimethacrylate, polymethyl methacrylate, polyethylene methacrylate, Bis-acrylic resin and resin composites are used as temporary restorative materials.…”

“…Acrylic resin restorations that are polymerised with heat are widely preferred due to their high resistance and durability merits (13). However, Bis-acrylic resins are increasingly used due to such properties as being practical, having minimal polymerization shrinkage and low exothermic reaction apart from providing remarkably satisfactory aesthetic results (10).…”