title: Comparison of experienced and inexperienced operators on bond strengths of total-etch and self-etch bonding systems.
abstract: OBJECTIVE
  To compare a two-step etch-and-rinse adhesive system and a one-step self-etch adhesive system in order to evaluate the influence of clinical experience on dentin bond strength.
  
  
  METHODS
  24 human molars were sectioned to obtain two 1 mm-thick slabs of mid-coronal dentin. Both surfaces of one of the two slabs that were obtained from each tooth were treated with a two-step etch-and-rinse adhesive (OptiBond Solo Plus), while both surfaces of the other slab were treated with a one-step self-etch adhesive (OptiBond All-In-One). 24 undergraduate, second-year students applied the adhesive on one of the two surfaces of each slab (Student group), while 12 dentists with experience in adhesive restorative dentistry (Expert group) applied the same adhesive on the other surface of the slab. Nine conical frustum-shaped resin composite (Premise Flowable) build-ups, whose smaller base was bonded to the dentin surface, were constructed on both surfaces of each dentin slab using a custom-made device. After thermocycling, specimens were subjected to microshear bond strength test. Data were analyzed by a multilevel statistical model.
  
  
  RESULTS
  The interaction term Experience x Adhesive resulted statistically significant (P < 0.0001). The bond strength (MPa) resulting from the self-etch adhesive was similar in the Student (27.8 +/- 9.0) and in the Expert group (26.5 +/- 7.0). The etch-and-rinse adhesive bond strength within the Student group (23.6 +/- 10.4) was lower than that within the Expert group (28.1 +/- 8.9).
authors.affiliation: Department of Public Health, Dentistry of Florence, Tuscany School of Dental Medicine, University of Florence and Siena, Italy. luca.giachetti@unifi.it
authors.forename: Luca
authors.initials: L
authors.lastname: Giachetti
authors.forename: Daniele
authors.initials: D
authors.lastname: Scaminaci Russo
authors.forename: Edoardo
authors.initials: E
authors.lastname: Rossi Campani
authors.forename: Matteo
authors.initials: M
authors.lastname: Baldini
authors.forename: Michele
authors.initials: M
authors.lastname: Nieri
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D002983:Clinical Competence; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D003815:Dentists; D006801:Humans; D008689:Methacrylates; D008963:Molar; D019279:Resin Cements; D013335:Students, Dental
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C451600:OptiBond Solo Plus; C500960:OptiBond Solo Plus Self-Etch; D019279:Resin Cements