Fracture characteristics of fibre reinforced composite bars used to provide rigid orthodontic dental segments
Online veröffentlicht: 13. Dez. 2023
Seitenbereich: 104 - 108
Eingereicht: 01. Juli 2007
Akzeptiert: 07. Sept. 2007
DOI: https://doi.org/10.2478/aoj-2007-0016
© 2007 Soodeh Tahmasbi et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Background
Fibre reinforced composites (FRC) can be used to join teeth as a rigid unit for anchorage purposes and/or for tooth movement. The utility of FRCs for these applications depends on the fracture characteristics and durability of the material under masticatory loads.
Aims
To evaluate the effect of simulated masticatory loads on the fracture characteristics of FRC bars joining two bicuspids.
Methods
Eighty extracted maxillary bicuspids were used. Pairs of bicuspids were joined with FRC bars on the buccal surfaces. The specimens were divided into two equal groups. In group A the fracture loads of the FRC bars were measured, and in group B the specimens were placed in a simulator and subjected to 4x105 chewing cycles, simulating a 2-year period of mastication. At the conclusion of this test the fracture loads of the FRC bars were measured in the intact specimens. All specimens were examined stereomicroscopically to determine the fracture pattern.
Results
There were no bond failures in group B during the simulated masticatory forces. The mean fracture loads in groups A and B were 195.8 N and 190.6 N, respectively. Stereomicroscopic examination showed that most fractures occurred at the enamel-composite interfaces in both groups. There were no significant differences between the groups in the fracture loads and fracture patterns.
Conclusions
Fibre reinforced composite bars bonded to bicuspids had sufficient durability to withstand the loads simulating a 2-year period of function. The fracture loads and fracture patterns of the FRC bars were not affected by the loads exerted by the simulator.