title: A comparison of three resin bonding agents to primary tooth dentin.
abstract: This study determined the shear bond strength of resin composites to primary dentin using three dentin adhesives and the presence or absence of a hybrid zone. The buccal and lingual surfaces of 40 recently extracted noncarious primary teeth were ground flat with SiC paper ending with the 600 grit. The teeth were divided at randomly into eight groups of five teeth (10 surfaces) each: 1) Unetched dentin, dry dentin, All-Bond 2/Bis-Fil P; 2) Unetched dentin, moist dentin, All-Bond 2/Bis-Fil P; 3) Dentin etched for 15 sec with 10% phosphoric acid, dry dentin, All-Bond 2/Bis-Fil P; 4) Dentin etched for 15 sec with 10% phosphoric acid, moist dentin, All-Bond 2/Bis-Fil P; 5) Dentin etched with 10% maleic acid for 15 sec, dry dentin, Scotchbond Multi-Purpose/Z100; 6) Dentin etched with 10% maleic acid for 15 sec, moist dentin, Scotchbond Multi-Purpose/Z100; 7) Dentin etched with 10 citric acid/3% ferric chloride, dry dentin, Amalgambond Plus/Z100; 8) Dentin etched with 10 citric acid/3% ferric chloride, moist dentin, Amalgambond Plus/Z100. All teeth were thermocycled 1000x (5 and 55 degrees C, 30-sec dwell time), and shear bond strength testing was conducted using an Instron (crosshead speed 0.5 mm/min). Failure sites after debonding were examined with the SEM. For each group, one additional tooth was used to prepare two class V cavities (one facial and one lingual) restored according to the specification in each group, sectioned buccolingually and examined with the SEM. The results, in MPa, were: 1) 12.55 +/- 5.97; 2) 10.41 +/- 6.16; 3) 9.94 +/- 7.26; 4) 12.25 +/- 4.70; 5) 13.02 +/- 8.01; 6) 16.51 +/- 8.62; 7) 12.51 +/- 8.95; 8) 17.93 +/- 6.44. ANOVA and Student-Newman-Keuls tests showed no statistically significant differences. SEM evaluation showed that the smear layer was removed in all groups exposing primary dentin tubules infiltrated by resin. A resin-reinforced hybrid layer was readily seen in all specimens.
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: F B
authors.initials: FB
authors.lastname: de Araujo
authors.forename: F
authors.initials: F
authors.lastname: García-Godoy
authors.forename: M
authors.initials: M
authors.lastname: Issáo
mesh_terms: D000134:Acid Etching, Dental; D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D002244:Carbon; D017554:Carbon Compounds, Inorganic; D002712:Chlorides; D019343:Citric Acid / Q000008:administration & dosage; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005290:Ferric Compounds / Q000008:administration & dosage; D006801:Humans; D008298:Maleates / Q000008:administration & dosage; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids / Q000008:administration & dosage; D019279:Resin Cements; D017655:Silicon Compounds; D012822:Silicon Dioxide / Q000737:chemistry; D016369:Smear Layer; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D014094:Tooth, Deciduous / Q000648:ultrastructure*; D015040:Zirconium / Q000737:chemistry
chemical_list: D000269:Adhesives; C070606:Amalgambond; D017554:Carbon Compounds, Inorganic; D002712:Chlorides; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005290:Ferric Compounds; D008298:Maleates; D008689:Methacrylates; D010756:Phosphoric Acids; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D017655:Silicon Compounds; C083568:Z100 composite resin; C078905:Bisfil; C100742:All-Bond 2; D019343:Citric Acid; D002244:Carbon; D012822:Silicon Dioxide; C030272:maleic acid; D015040:Zirconium; C024555:ferric chloride; C022088:silicon carbide