Análise fotoelástica da tensão de contração da polimerização de compósitos resinosos sob influência de técnicas restauradoras / Photoelastic analysis of polymerization shrinkage stress of composites under the influence of restorative techniques

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

20/06/2011

RESUMO

Polymerization shrinkage stress is an undesirable and inevitable characteristic of adhesive restorations. It is important to understand the stress distribution to improve the clinical effectiveness of resin composite restoration. Chapter 1: The aim was to evaluate the polymerization shrinkage stress and degree of conversion of a resin composite material submitted to different photoactivation protocols. A bulk increment of composite Filtek Z350 was placed in the central perforation of photoelastic disc and photoactivated using LED-based curing unit (BluePhase II) with energy density of 12, 24 or 36 J/cm2 using the following photopolymerization protocols: continuous high intensity (HI: 1200 mW/cm2 during 10, 20 or 30 s), continuous low intensity (LI: 650 mW/cm2 during 18, 36 or 54 s) and soft-start (SS: 150 mW/cm2 during 5 s + 1200 mW/cm2 during 9, 19 or 29 s) (n=5). Photoelastic analysis was used to evaluate polymerization shrinkage stress of composite and FTIR was performed to access the degree of conversion of composite according to the curing modes. Statistical test ANOVA 3-way was used to determine the main effects and the corresponding interactions, then ANOVA 2 way was performed for each time (p<0.05). The images showed that polymerization shrinkage stress increases with higher values of power density. No significant differences should be noticed on polymerization shrinkage stress between high and low intensity modes of activation. Soft-start method generates stresses that were statistically lower than continuous modes except when 12 J/cm2 was applied. Similar degree of conversion was observed for photoactivation modes used, except for soft-start mode with 12, 24 and 36 J/cm2 that showed lowest levels of conversion. It could be concluded that polymerization shrinkage stress was significantly influenced by energy density and the curing protocol. No benefits on degree of conversion were observed by increasing the energy density. Chapter 2: The aim was to evaluate the polymerization shrinkage stress created in tooth photoelastic models using different filling techniques. Twenty class II tooth models were obtained. They were distributed into four experimental groups (n=5) according to the following restorative techniques: resin composite with horizontal insertion (H), resin composite with oblique insertion (O), flowable composite + resin composite with horizontal insertion (F + H) and flowable composite + resin composite with oblique insertion (F + O). Restored photoelastic models were analyzed using a plane polariscope. The stress along seven points of adhesive interface was analyzed from images of each insertion, at the baseline (immediately) and 24 h after polymerization. Maximum shear stress data was obtained and submitted to ANOVA 2-way, followed by Tukey s post hoc test at p = 0.05. Horizontal and oblique techniques have shown differences in stress patterns. No difference between horizontal and oblique techniques was found. Groups restored with flow composite showed significant higher stress levels than those restored only with regular composite. In conclusion, the use of flow composite created higher polymerization stress effects on the class II restoration than does the conventional restoration technique.

ASSUNTO(S)

resinas materiais dentários resins dental materials

ACESSO AO ARTIGO

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