Fracture Resistance And Clinical Practice Of Endodontically Treated Residual Root Restored With Polylatic Acid Absorbable Intracanal Post And Film

Part1Fracture resistance of endodontically treated residual root restoredwith polylactic acid absorbable intracanal post and filmObjective To investigate the fracture resistance of endodontically treatedteeth, restored with polylatic acid absorbable intracanal post and film.Methods Twenty-four extracted human mandibular premolars weredivided into3groups randomly, with8samples in each group. Group A: Teethrestored with polylatic acid absorbable intracanal posts. Group B: Teeth restoredwith glass fiber posts. Group C: Teeth restored with short composite resin posts.All teeth were no dentine ferrule and restored with composite resin crowns.Each specimen was subjected to a load on INSTRON5567material testingmachine until failure. Fracture resistance was recorded, and fracture modes werevisually examined. Then fracture resistance was compared statistically byone-way ANOVA at a significance level of0.05to determine the differencesamong groups, and followed by LSD test for multiple comparisons.Results There were statistically significant differences of fractureresistance among the3groups (P<0.05). No significant difference was found between group A and group B (P>0.05), and fracture resistance of group A andB was significantly lower than that of group C (P<0.05). The fracture modes ofall the teeth were favorable.Conclusion Fracture resistance of residual roots endodontically treatedwith polylatic acid intracanal posts and film, might meet the needs of clinicalpractice.Part2Case analysis of polylatic acid absorbable intracanal post and filmin restoring primary anterior residual roots of early chidhood childrenObjective To evaluate the restoration effects in residual roots of maxillaryprimary anterior teeth treated by polylatic acid absorbable intracanal posts andfilm.Methods Nineteen residual roots of maxillary primary anterior teeth fromseven early childhood children were selected as the clinical samples. All thedental treatments were finished under general anesthesia. Firstly, the residualroots were treated with root canal therapy, and then polylatic acid posts wereimplanted into root canals fixed assistantly by polylatic acid absorbable film,and finally teeth crowns were restored with composite resin. During the followup period of every3months, the children were examined by clinical test toevaluate clinical effects of the restoration by polylatic acid posts and film.Meanwhile, they were examined by periapical radiograph examination to detectthe absorption of the restored residual root and the development of permanentsuccessor.Results During the12-month follow-up period,13residual roots restoredwith polylatic acid posts and film were remained, the success rate of which was68.42%. Over the same period, periapical radiograph examination showed that polylatic acid posts and the roots of primary teeth showed synchrotronresorption. Also, the permanent successor was observed normal development.Conclusion The short-term effects of the restoration of residual roots bypolylatic acid absorbable post and film in early childhood children werefavorable, but long-term effects need further research.