title: Shear bond strength and enamel fracture behavior of ceramic brackets Fascination® and Fascination®2.
abstract: OBJECTIVE
  The purpose of this study was to compare the shear bond strength and incidence of enamel fractures of the ceramic brackets Fascination® and Fascination®2.
  
  
  METHODS
  A total of 360 teeth (180 first upper bicuspids and 180 lower incisors) were stored in 96% ethanol, while 360 other teeth (180 first upper bicuspids and 180 lower incisors) were stored in 0.1% thymol. All 720 teeth were bonded one-half each with Fascination® and Fascination®2 brackets using three different adhesives and three different light curing units. The teeth were debonded with a debonding-device according to DIN EN ISO 10477 using a universal testing machine with a crosshead speed of 1 mm per minute. The enamel surface was then examined stereomicroscopically (10x and 40x magnification). The non-parametric Mann-Whitney U test was used, since the data were not normally distributed.
  
  
  RESULTS
  The Fascination®2 brackets provided significantly lower shear bond strength than Fascination® brackets (p = 0.003). Fascination® brackets demonstrated significantly fewer, smaller enamel fractures than Fascination®2 brackets (p = 0.012).
  
  
  CONCLUSIONS
  The lower shear bond strength of the Fascination®2 brackets is clinically acceptable, but our study's experimental design did not enable us to prove whether this is clinically associated with a lower risk of enamel fracture.
authors.affiliation: Department of Orthodontics, Dentofacial Orthopedics and Pedodontics, Charité – Universitätsmedizin Berlin, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Gittner
authors.forename: Ralf
authors.initials: R
authors.lastname: Müller-Hartwich
authors.forename: Sylvia
authors.initials: S
authors.lastname: Engel
authors.forename: Paul-Georg
authors.initials: PG
authors.lastname: Jost-Brinkmann
mesh_terms: D000268:Adhesiveness; D002516:Ceramics; D001840:Dental Bonding / Q000009:adverse effects* / Q000379:methods*; D003743:Dental Enamel / Q000293:injuries* / Q000473:pathology; D006244:Hardness; D006801:Humans; D066298:In Vitro Techniques; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets / Q000009:adverse effects*; D033081:Shear Strength; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000209:etiology* / Q000517:prevention & control