title: Microtensile bond strength of 4 dentin adhesives to primary dentin.
abstract: OBJECTIVE
  This study's purpose was to evaluate the aging effect on the bond strength of 4 adhesive systems on primary dentin 24 hours and 6 months after bonding.
  
  
  METHODS
  The crowns of extracted, caries-free primary molars were grounded and flat surfaces were prepared  and distributed into 4 groups (n=7-9). The adhesives Scotchbond Multi-purpose (SMP), Single Bond (SB), Clearfil SE Bond (CSB), and Adper Prompt L-Pop (APL) were applied with the composite resin Filtek Z-250. Specimens were stored in distilled water (37°C/24h), the crowns were sectioned,  and 0.8-mm² resin-dentin sticks were obtained and divided into 2 groups: (1) 24h; and (2) 6m. Each group's specimens were tested under tensile at 0.5 mm/minute until they fractured. The fractured sticks were examined by scanning electron microscopy. The data were analyzed by 2-way repeated  measures: analysis of variance; Tukey's test (P<.05); and Kruskal-Wallis test (P<.05).
  
  
  RESULTS
  The mTBS (MPa) means values were: SMP=33.28 (2.05), SB=23.27 (4.78), APL=20.64 (10.66), and CSB=18.94 (11.94) for the 24-hour group; and SMP=30.59 (6.29), SB=22.39  (5.9), CSB=21.50 (10.67), and APL=17.19 (6.88) for the 6-month group. The most frequent fracture type found was cohesive failure of the adhesive and mixed, with no statistically significant difference found between the groups.
  
  
  CONCLUSIONS
  Resin bond strength on primary dentin was  not influenced by aging for the adhesive systems tested.
authors: Department of Dental Materials, School of Dentistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil. ca_mirand@yahoo.com.br
authors: Carla
authors: C
authors: Miranda
authors: Luiz Henrique Maykot
authors: LH
authors: Prates
authors: Marcelo Carvalho
authors: MC
authors: Chain
authors: Ricardo de Sousa
authors: Rde S
authors: Vieira
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D066298:In Vitro Techniques; D008855:Microscopy, Electron, Scanning; D008963:Molar; D019279:Resin Cements / Q000737:chemistry*; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength; D014094:Tooth, Deciduous
chemical_list: C438313:Clearfil SE Bond; D017220:Dentin-Bonding Agents; C408584:Prompt L-Pop; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate