Homogeneity of different composite resins used as core build up materials on glass fiber posts: scanning electron microscopy evaluation
| Other(s) | ||
|---|---|---|
Tyrimo grupės vadovas / Research group head |
| Date |
|---|
2020-05-15 |
Dentistry.
ISBN: 978-83-947627-3-5.
Introduction: To restore endodontically treated teeth with significant loss of tooth structure need a post and core in order to retain final restoration. First choice of restoration is glass fiber post in combination with composite resins to directly build-up the core. Composite resins are most popular in core foundation materials due to the biomechanical and physical properties, bonding to the tooth structure and restoration. However, there still occure complications related to the core material. Aim: To compare homogeneity of light cured composite and dual cured resin composite applied on glass fiber post. Materials and methods: 20 intact extracted human maxillary incisors were included and stored in saline water. Specimens were treated endodontically, 2 mm. ferrule and 1 mm butt shoulder were prepared. Guttapercha was removed from the root canals, leaving 4 mm. Root canals were prepared for post insertion. The specimens were divided into 2 groups (n= 10): 1gr-core rebuild with dual cure resin composite, 2gr-core rebuild with light cured composite . Adhesive was applied into the canals and on posts. 1gr-posts were cemented into the canals and core was rebuild using dual cure resin composite in a single step. 2gr-posts were cemented into the canals using dual cure resin composite and cores were build up using light cured composite. Specimens were cut perpendicular to their long axis, processed for SEM observation.SPSS Version 22.0 was used to analyze the data and significance threshold was set to p<0,05 according to Mann-Whitney U, Spearman, Chi- Quadrat tests. Results: 80% of specimens showed absolute homogeneity, while 20% of specimens showed voids. In 1gr 90% of specimens had no voids and in the same group 10% of specimemens had one void smaller than 200μm. In 2gr 70% of the specimens had no voids and 30% of the same group specimens had one void smaller than 200μm.1gr showed greater integrity [...].