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1.
Annals of Dentistry ; : 25-34, 2010.
Artigo em Inglês | WPRIM | ID: wpr-627586

RESUMO

The widespread use of aesthetic fillings has highlighted their advantages and disadvantages. One of the most troublesome features of earlier aesthetic materials was the difficulty of finishing the restoration surface to decrease adherence of food debris. The rougher the finished surface, the greater the possibility of bacterial accumulation and discolouration of restoration along the restoration margin with secondary caries formation. Aside from these clinical implications, patients are highly discerning and could detect roughness of 0.30 μm with their tongue. The aesthetic restoration should mimic the appearance of natural dentition and should have an enamel-like appearance. An increased demand for superior aesthetics from composite resin has increased the demand for more eff icient and simple polishing techniques. The development of nanocomposites has given a new perspective to the polishing of composite resins. Nanocomposites claim the advantage of improved gloss, optical characteristics and reduced wear. To date, results of in vitro studies have been equivocal regarding the most efficient and effective polishing system. There is variation in the effects of different finishing and polishing instruments on the surface roughness due to great diversity in size, shape, composition and distribution of the filler particles of composite resins, type of resin and a wide variety of finishing and polishing instruments. This paper will review the different factors that affect polishing techniques used in achieving the desired polish on composite resin restorations.

2.
Pakistan Oral and Dental Journal. 2009; 29 (1): 123-130
em Inglês | IMEMR | ID: emr-123338

RESUMO

This in-vitro study was conducted to investigate the stain resistance of direct composite resin restorative materials with different polishing systems [diamond finishing and polishing burs, aluminium oxide disks and abrasive impregnated disks] in comparison to the material cured against a mylar strip. The composite resin materials investigated included Clearfil AP-X [hybrid], Filtek Z-250 [hybrid], Definite [Ormocer], and Silux Plus [microfill]. Forty disk specimens [10mm x 2mm] of each composite resin were prepared. Ten mylar cured specimens were assigned for each polishing system and ten were used as controls with no further treatment after curing. A spectrophotometer [Spectraflash 500] was used to determine the initial colour and the colour change after one week immersion. All specimens were stored in tea separately for one week at 39[degree sign] C. Post immersion colour measurements were undertaken to assess colour change [delta E]. One way ANOVA showed that there was statistically significant difference between the different composites and the polish groups for discoloration at p<0.05. All the composites tested showed significant discoloration when polished with Diamond burs. The least discoloration was found when specimens were polished with soflex except with Z-250 which discoloured less under mylar than soflex but the difference was not significant. Among the materials tested AP-X showed the least discoloration


Assuntos
Materiais Dentários , Restauração Dentária Permanente , Descoloração de Dente
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