title: Comparative evaluation of microleakage of newer generation dentin bonding agents: An in vitro study.
abstract: BACKGROUND
  Adhesive dentistry has been progressing with rapid pace over the past decade. Composite resin is the most esthetic restorative material currently available for restoring teeth. In spite of it being in use since a decade, still failure cases are seen which are mainly due to polymerization shrinkage and subsequent inadequate adhesion to cavity walls, leading to microleakage. Various generations of dentin bonding agents have been introduced to overcome the shortcoming of composite resin.
  
  
  OBJECTIVE
  To determine the microleakage of the 6 th , 7 th , and 8 th generation dentin bonding agents.
  
  
  METHODS
  Forty-five extracted human premolars were taken for the study. Standardized Class V cavities were prepared on all the teeth. The samples were divided into three groups according to the generation of bonding agent used. Group I was bonded with the 6 th generation, Group II with the 7 th generation, and Group III with the 8 th generation dentin bonding agent. All the Class V preparations were restored with a nano-ceramic composite restorative (Ceram X). The samples were then thermocycled between 5 and 55 ± 2°C for 100 cycles and immersed in 2% methylene blue for 48 h for evaluation of microleakage under a stereomicroscope.
  
  
  METHODS
  The data was statistically analyzed using Kruskal-Wallis nonparametric analysis, and Mann-Whitney U-test was applied to compare the various groups.
  
  
  RESULTS
  The microleakage value was the highest in Group II (7 th generation bonding agent) followed by Group I (6 th generation bonding agent) and least in Group III (8 th generation bonding agent).
  
  
  CONCLUSIONS
  The 8 th generation dentin bonding showed statistically significant results in terms of lesser microleakage as compared to the 6 th and 7 th generation dentin bonding agents.
authors.affiliation: Department of Paedodontics and Preventive Dentistry, D J College of Dental Sciences and Research, Modinagar, Ghaziabad, Uttar Pradesh, India.
authors.forename: Rani
authors.initials: R
authors.lastname: Somani
authors.forename: Shipra
authors.initials: S
authors.lastname: Jaidka
authors.forename: Sameksha
authors.initials: S
authors.lastname: Arora
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D003763:Dental Leakage; D003793:Dental Restoration, Permanent; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements