ULTRASONIC ROOT-END PREPARATION AND SEALING ABILITY OF CONVENTIONALLY-SETTING GLASS IONOMER CEMENTS IN SURGICAL ENDODONTICS

In chapter 1 the integrity of root apices of cadaver and extracted teeth after ultrasonic root-end cavity preparation at medium and low intensity was evaluated. The frequency of cracks and chipping caused by ultrasonic root-end preparation was greater on extracted than on cadaver teeth. Therefore investigation on root-end preparation should preferably be conducted in situ. As it does not result in fewer side effects, lowering the ultrasonic power from medium to low intensity is not recommended. In chapter 2 the root-end sealing ability of IRM, Fuji IX and MTA in small cavities was compared and research on leakage study methodology by means of comparison of the fluid transport method (FTM) and capillary flow porometry (CFP) was performed. The conventionally-setting glass ionomer (GIC) Fuji IX showed least leakage. CFP demonstrated through pores in all teeth, whereas FTM did not. CFP appeared to be a useful method for leakage evaluation. In chapter 3 and 4 the long term sealing ability of root-end filling materials was evaluated in large cavities. Standardized bovine root sections were filled with Gutta Percha, Ketac Fil, Fuji IX, MTA, IRM, Ketac Fil with conditioner (C) or Fuji IX (C) and submitted to CFP at 48 hours, 1 month and 6 months. All materials were associated with capillary flow. The maximum pore diameters will be indicative of the eventual leakage or otherwise of bacteria and their metabolites. IRM root-end fillings had through pores that were smaller than those associated with other materials. GICs had the largest pores, although dentine conditioning improved their performance. The seal of all materials improved after 6 months. In chapter 5 the apical seal of MTA and Fuji IX (C) in root-end cavities with and without cracks and their obturation efficiency were evaluated. The teeth were immersed in Indian ink and cleared. Apical leakage was measured and obturation efficiency was scored. The presence of cracks, originating from the root canal, negatively influenced the seal and seemed to be of more importance than the root-end filling material being used. MTA and Fuji IX showed equal sealing capacity, but MTA showed better obturation efficiency than Fuji IX.

Author dc:creator

• De Bruyne, Mieke

Contributors dc:contributor

• De Moor, R

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

und

Identifier

https://biblio.ugent.be/publication/469700
http://doi.org/1854/5759
https://biblio.ugent.be/publication/469700/file/1878366

OAI identifier oai:identifier

oai:archive.ugent.be:469700