title: Shear Bond Strength and Microleakage of a New Self-etching/Self-adhesive Pit and Fissure Sealant.
abstract: OBJECTIVE
  To evaluate shear bond strength and microleakage of a new self-etching/self-adhesive fissure sealant on prismless enamel compared with conventional fissure sealing.
  
  
  METHODS
  A total of 90 extracted third molars were assigned to 3 main groups: group 1: self-etching/self-adhesive sealant, without acid etching; group 2: self-etching/self-adhesive sealant, with prior acid etching; group 3: conventional fissure sealing (control group). After specimen preparation, each group was divided into 3 subgroups according to storage time (1-day water storage, 3-month water storage, and 1-day water storage followed by 5000x thermocycling). The shear bond strength was determined with a universal testing machine, according to ISO standard 29022. Afterwards, the failure mode was analyzed. An additional 24 third molars were used for microleakage assessment. The fissure pattern was sealed in strict accordance with the manufacturers' instructions. After thermocycling, the dye penetration was examined. Data were analyzed using the Mann-Whitney U-Test at a significance level of 0.05.
  
  
  RESULTS
  The shear bond strength of the self-etching/self-adhesive fissure sealant without prior acid etching was significantly lower (4.3 MPa) than that of the self-etching/self-adhesive fissure sealant with prior acid etching (17.1 MPa) and the conventional fissure sealing (19.1 MPa). Microleakage was significantly lower in the control group (1.1%) and in the group with the self-etching/self-adhesive sealant with prior acid etching (0.8%) compared to the group that used the self-etching/self-adhesive material alone (49.4%).
  
  
  CONCLUSIONS
  The self-etching/self-adhesive fissure sealant can be recommended for clinical use when enamel is etched with phosphoric acid. The self-etching/self-adhesive sealant without prior acid etching showed significantly inferior results.
authors.forename: Christoph
authors.initials: C
authors.lastname: Schuldt
authors.forename: Sebastian
authors.initials: S
authors.lastname: Birlbauer
authors.forename: Vinay
authors.initials: V
authors.lastname: Pitchika
authors.forename: Alexander
authors.initials: A
authors.lastname: Crispin
authors.forename: Reinhard
authors.initials: R
authors.lastname: Hickel
authors.forename: Nicoleta
authors.initials: N
authors.lastname: Ilie
authors.forename: Jan
authors.initials: J
authors.lastname: Kühnisch
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000268:Adhesiveness; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry; D055117:Curing Lights, Dental / Q000145:classification; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification*; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D010756:Phosphoric Acids / Q000737:chemistry; D010895:Pit and Fissure Sealants / Q000737:chemistry*; D058105:Polymerization; D011897:Random Allocation; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D010756:Phosphoric Acids; D010895:Pit and Fissure Sealants; D014867:Water; C059908:Helioseal; C030242:phosphoric acid