RESPUESTA PULPAR FRENTE A DIFERENTES AGENTES CEMENTANTES

El objetivo de la presente revisión fue evaluar las informaciones histopatológicas sobre la respuesta pulpar frente a la utilización de gerentes agentes cementantes, porque cuando se realiza la cementación de restauraciones indirectas sobre dientes con pulpa vital la biocompatibilidad del cemento es una de las propiedades más importantes para la selección del agente a utilizar La evaluación nos permitió concluir que ionómeros de vidrio y materiales con componente resinoso en su formulación producen una inflamación pulpar leve con tendencia a la resolución, pero si a la toxicidad del material se asocia la infiltración bacteriana, el proceso inflamatorio persiste y se acentúa; también nosotros concluimos que el espesor del remanente dentinario es importante en la protección del complejo dentino-pulpar

Mechanical properties and DIC analyses of CAD/CAM materials

This study compared two well-known computer-aided-design/computer-aided-manufactured (CAD/CAM) blocks (Paradigm MZ100 [3M ESPE] and Vitablocs Mark II [Vita] in terms of fracture toughness (Kic), index of brittleness (BI) and stress/strain distributions. Three-point bending test was used to calculate the fracture toughness, and the relationship between the Kic and the Vickers hardness was used to calculate the index of brittleness. Additionally, digital image correlation (DIC) was used to analyze the stress/strain distribution on both materials. The values for fracture toughness obtained under three-point bending were 1.87Pa√m (±0.69) for Paradigm MZ100 and 1.18Pa√m (±0.17) for Vitablocs Mark II. For the index of brittleness, the values for Paradigm and Vitablocs were 73.13μm-1/2 (±30.72) and 550.22μm-1/2 (±82.46). One-way ANOVA was performed to find differences (α=0.05) and detected deviation between the stress/strain distributions on both materials. Both CAD/CAM materials tested presented similar fracture toughness, but, different strain/stress distributions. Both materials may perform similarly when used in CAD/CAM restorations

Avaliação da Rugosidade Superficial de Resina Composta após a Ação de Agentes Clareadores Imediatos

Ao se realizar o clareamento dental existe uma preocupação quanto aos efeitos dos agentes clareadores sobre os materiais restauradores presentes na cavidade bucal. Este trabalho tem como objetivo avaliar a rugosidade superficial de uma resina composta nanoparticulada submetida à ação do peróxido de hidrogênio a 35% ativado por luz halógena e LED´s com laser de diodo. Os resultados foram obtidos pelo uso de rugosímetro e microscópio eletrônico de varredura

Effect of temporary cements on the shear bond strength of luting cements

OBJECTIVE: The purpose of this study was to evaluate, by shear bond strength (SBS) testing, the influence of different types of temporary cements on the final cementation using conventional and self-etching resin-based luting cements. Material and Methods: Forty human teeth divided in two halves were assigned to 8 groups (n=10): I and V (no temporary cementation); II and VI: Ca(OH)2-based cement; III and VII: zinc oxide (ZO)-based cement; IV and VIII: ZO-eugenol (ZOE)-based cement. Final cementation was done with RelyX ARC cement (groups I to IV) and RelyX Unicem cement (groups V to VIII). Data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. RESULTS: Means were (MPa): I - 3.80 (&plusmn;1.481); II - 5.24 (&plusmn;2.297); III - 6.98 (&plusmn;1.885); IV - 6.54 (&plusmn;1.459); V - 5.22 (&plusmn;2.465); VI - 4.48 (&plusmn;1.705); VII - 6.29 (&plusmn;2.280); VIII - 2.47 (&plusmn;2.076). Comparison of the groups that had the same temporary cementation (Groups II and VI; III and VII; IV and VIII) showed statistically significant difference (p<0.001) only between Groups IV and VIII, in which ZOE-based cements were used. The use of either Ca(OH)2-based (Groups II and VI) or ZO-based (Groups III and VII) cements showed no statistically significant difference (p>0.05) for the different luting cements (RelyX TM ARC and RelyX TM Unicem). The groups that had no temporary cementation (Groups I and V) did not differ significantly from each other either (p>0.05). CONCLUSION: When temporary cementation was done with ZO- or ZOE-based cements and final cementation was done with RelyX ARC, there was an increase in the SBS compared to the control. In the groups cemented with RelyX Unicem, however, the use of a ZOE-based temporary cement affected negatively the SBS of the luting agent used for final cementation

Respuesta pulpar frente a diferentes agentes cementantes

El objetivo de la presente revisión fué evaluar las informaciones histopatológicas sobre larespuesta pulpar frente a la utilización de diferentes agentes cementantes, porque cuando serealiza la cementación de restauraciones indirectas sobre dientes con pulpa vital labiocompatibilidad del cemento es una de las propiedades más importantes para la selección delagente a utilizar. La evaluación nos permitió concluir que ionómeros de vidrio y materiales concomponente resinoso en su formulación, producen una inflamación pulpar leve con tendenciaa la resolución, pero si a la toxicidad del material se asocia la infiltración bacteriana, el procesoinflamatorio persiste y se acentúa; también nosotros concluimos que el espesor del remanentedentinario es importante en la protección del complejo dentino-pulpar

Avaliação da Rugosidade Superficial de Resina Composta após a Ação de Agentes Clareadores Imediatos

Ao se realizar o clareamento dental existe uma preocupação quanto aos efeitos dos agentes clareadores sobre os materiais restauradores presentes na cavidade bucal. Este trabalho tem como objetivo avaliar a rugosidade superficial de uma resina composta nanoparticulada submetida à ação do peróxido de hidrogênio a 35% ativado por luz halógena e LED´s com laser de diodo. Os resultados foram obtidos pelo uso de rugosímetro e microscópio eletrônico de varredura