title: Adhesion to primary dentin: microshear bond strength and scanning electron microscopic observation.
abstract: OBJECTIVE
  To compare the bond strength to human primary dentin of a self-adhesive light-curing resin composite, a self-etch adhesive and a glass-ionomer cement by means of microshear bond strength (pSBS) test and scanning electron microscopic (SEM) observations.
  
  
  METHODS
  75 human primary molars were sectioned to obtain a 2 mm-thick slab of mid-coronal dentin, randomly divided into three groups (n=25). Nine conical frustum-shaped buildups were constructed on the occlusal surface of each dentin slab using a self-adhesive light-curing resin composite (Vertise Flow; Group 1), bonding agent (Optibond All-in-One; Group 2) combined with resin composite (Premise Flow) and a glass-ionomer cement (Ketac-Fil; Group 3). After thermocycling, specimens were subjected to microSBS test. All debonded specimens were observed at SEM. Data were analyzed by a mixed model and chi-square test.
  
  
  RESULTS
  The bond strength measured in Group 1 (9.0 +/- 4.5 MPa) was significantly lower than that one recorded in Group 2 (20.2 +/-12.5 MPa) although it was significantly higher than the one recorded in Group 3 (4.8 +/- 2.3 MPa). Failures were mainly adhesive in all groups.
authors.forename: Daniele
authors.initials: D
authors.lastname: Scaminaci Russo
authors.forename: Valentina
authors.initials: V
authors.lastname: Iuliano
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Franchi
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
authors.forename: Luca
authors.initials: L
authors.lastname: Giachetti
mesh_terms: D000268:Adhesiveness; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D055115:Light-Curing of Dental Adhesives; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014094:Tooth, Deciduous / Q000648:ultrastructure*
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D008298:Maleates; C092987:Optibond; D019279:Resin Cements; C507210:premise composite resin; C581746:vertise flow; C040964:Ketac-Fil