The effect of simulated oral and clinical conditions on the fracture strength of ceramic bracket tie-wings

This study examined the effect of simulated oral and clinical conditions on the tie-wing fracture strength of a polycrystalline and a monocrystalline bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a two-factor ANOVA and Dunnett's post hoc test ( = 0.05), monocrystalline bracket tie-wing fracture strength was significantly decreased as a function of PBS storage over time with and without ligation, while there was no significant effect on the polycrystalline bracket tie-wing fracture strength. With monocrystalline brackets, tie-wing fracture origin appeared to differ between brackets exposed to repetitive ligation and those with no ligation. The results suggest that monocrystalline bracket tie-wing fracture strength is more susceptible to degradation in the oral environment.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Oral Biology (UMKC)

Grantor dc:publisher

University of Missouri--Kansas City

Year dc:date.issued

2011

Author dc:creator

• Darmitzel, Stephen Edward, 1981-

Advisor dc:contributor.advisor

• Nickel, Jeffrey C. (Jeffrey Charles), 1957-

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/10355/11361

OAI identifier oai:identifier

oai:mospace.umsystem.edu:10355/11361