Fracture strength of ceramic bracket tie wings subjected to tension

Gerald Johnson, Mary P. Walker, Katherine Kula

Research output: Contribution to journalArticle

17 Scopus citations


One of the most common areas of ceramic bracket fracture is within the tie-wing complex. When an archwire is ligated into position, tensile forces are placed under the tie wing. However, no study, to date, has focused specifically on the fracture resistance of the tie-wing complex. The aim of this study is to compare the tensile fracture strength of seven currently available ceramic brackets (Inspire, Fascination, Mystique, InVu, Clarity, Virage, and Luxi) as a function of bracket brand and bracket configuration, semitwin vs true-twin. Based on a power analysis of pilot data, 10 maxillary central incisor brackets per group were tested to failure with a tensile load placed directly under the distoincisal tie wing. The results ranged from a maximum mean fracture strength of 147.71 (5.87) MPa with Fascination brackets to a minimum mean fracture strength of 84.28 (7.01) MPa with Luxi brackets. The statistical analysis indicated a significant effect on fracture strength as a function of bracket brand (P < .05) and that semitwin brackets, Fascination, Mystique, and Virage, had significantly higher fracture strength than true-twin brackets, Clarity, InVu, and Luxi (P < .05). Interestingly, the only monocrystalline bracket in the study, Inspire, could not be fractured using the investigation protocol. In fact, the steel ligature fixture wire would break before tie-wing fracture at a mean fixture failure of 198.65 MPa.

Original languageEnglish (US)
Pages (from-to)95-100
Number of pages6
JournalAngle Orthodontist
Issue number1
StatePublished - Jan 1 2005


  • Ceramic brackets
  • Fracture resistance

ASJC Scopus subject areas

  • Orthodontics

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    Johnson, G., Walker, M. P., & Kula, K. (2005). Fracture strength of ceramic bracket tie wings subjected to tension. Angle Orthodontist, 75(1), 95-100.