Resumo

REIS, Andréa Candido dos; AGNELLI, José Augusto Marcondes; NICOLUZZI, Alexandro  e  MAZZO, Carla Rodrigues. Análise do comportamento superficial de resinas compostas polidas e não polidas submetidas a envelhecimento artificial acelerado. RGO, Rev. gaúch. odontol. (Online) [online]. 2013, vol.61, n.1, pp. 07-11. ISSN 1981-8637.

Objective This study aimed to evaluate the occurrence of surface changes in composite resins, when subjected to surface treatment by polishing and artificial accelerated aging. Methods The changes were quantified through rugosimetric analysis and Scanning Electron Microscopy. Five composite resins were used (Charisma, Herculite, TPH, Z-250 and Supreme) and for each one, 32 samples were made, which were subdivided into four groups according to the surface treatment received: polished and aged, polished not aged, unpolished and aged and unpolished but not aged (control). The samples were obtained through a Teflon matrix with a diameter of 9 mm and height of 2 mm. For the polishing, the Sof-Lex Pop-On system (3M) was used and to execute the artificial accelerated aging, the Artificial Aging Machine (Comexim) was used, in which a 192 hours cycle was established, corresponding to an aging of five years. The Scanning Electron Microscopy analyses were performed under magnifications of 250x, 500x, 1000x and 2000x. All 120 samples were subjected to rugosimetric analysis through three parallel readings of each sample surface. Results The Kruskal Wallis statistical test showed statistically significant differences (p <0.05) only between the type TPH composite resins, polished and either with or without aging, for the average surface roughness. Conclusion The results showed that, for surface roughness, only the polished TPH resin showed significant differences when comparing aged and non- aged specimens. In addition, all the composite resins showed lower measurements of surface roughness when subjected to polishing treatment and higher when subjected to Artificial Aging.

Palavras-chave : tratamento endodôntico; necrose pulpar; controle da infecção.