Microleakage Of Endodontically Treated Teeth Restored With Polylatic Acid Absorbable Screw Posts And Films

Part 1 Microleakage of endodontically treated teeth restored with polylatic acid absorbable screw posts and different layers of filmsObjective To investigate the sealing capability of endodontically treated teeth restored with polylatic acid absorbable post and different layers of films.Methods Fifty extracted maxillary central incisor were chemomechanically prepared and filled with gutta-percha and sealer. Post-space were prepared by special equipment, then they were randomly divided into five groups. Absorbable screw posts were enwound by different layer of absorbable films and screwed into the root canal. After that, all of the teeth were separately immersed in Indian ink for 72 hours. A buccolingual section was made through the vertical axis of specimens and a stereomicroscope was used to evaluate the deepest length of dye penetration. The one-way ANOVA test was used to determine intergroup difference.Results A statistically significant difference of microleakage was found among the tested groups (P=0.000). The group with three layers of absorbable films had the lowest microleakage(1.30±0.77)mm and the group with no film had the highest microleakage(4.02±1.52)mm.Conclusion The optimum film layer is three layers, used with absorbable post in restoring residual root.Part 2 Sealing capability of polylatic acid absorbable films and luting cement materials commonly used in clinicalObjective To comparison the sealing capability between polylatic acid absorbable films and luting cement materials commonly used in clinical.Methods Thirty-six extracted maxillary central incisor were chemomechanically prepared and filled with gutta-percha and sealer. Then they were randomly divided into five groups, group A were restored with absorbable screw posts enwound by three layers of absorbable films; group B were restored with fiber posts cemented with ResiLute,a kind of dual cure resin cement; group C were restored with metal screw posts cemented with glass ionomer cement (GIC);group D and E were positive and negative controls. After restoring with posts, all of the teeth were separately immersed in Indian ink for 72 hours. A buccolingual section was made through the vertical axis of specimens and a stereomicroscope was used to evaluate the deepest length of dye penetration. The one-way ANOVA test was used to determine intergroup difference.Results A statistically significant difference of microleakage was found among the three tested groups (P=0.001).Group B had the lowest microleakage (0.50±0.45)mm, followed by Group A(1.30±0.77)mm and Group C (1.47±0.41)mm. But no significant difference was observed between Group A and Group C(P=0.511).Conclusion The sealing capability of polylatic acid absorbable films are as better as glass ionomer cement, it can be used to restore primary teeth with screw post.