title: Hydrostatic pulpal pressure effect upon microleakage.
abstract: OBJECTIVE
  To evaluate if hydrostatic pulpal pressure plays a role in reducing microleakage.
  
  
  METHODS
  Uniform Class 5 preparations were accomplished on human molars with one margin on root dentin. Prepared teeth were randomly placed in one of three groups: (1) Hydrostatic pressure simulation at 20 cm pulpal pressure; (2) Hydrostatic pressure simulation but no pressure applied (positive control); and (3) Conventional microleakage method. Specimens were subjected to 24 hours methylene blue dye, sectioned, and microleakage assessed as a function of microleakage length versus entire preparation wall length using a traveling microscope.
  
  
  RESULTS
  Hydrostatic pressure specimens demonstrated less gingival wall microleakage than the control groups while no difference was found between occlusal preparation walls.
authors.affiliation: 81 DS/SGD, 606 Fisher Street, Keesler AFB, MS 39534, USA. howard.roberts@us.af.mil
authors.forename: Howard W
authors.initials: HW
authors.lastname: Roberts
authors.forename: David H
authors.initials: DH
authors.lastname: Pashley
mesh_terms: D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000473:pathology; D003763:Dental Leakage / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry; D003782:Dental Pulp / Q000502:physiology*; D003793:Dental Restoration, Permanent; D003804:Dentin / Q000473:pathology; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D006874:Hydrostatic Pressure; D008751:Methylene Blue; D008964:Molar, Third / Q000473:pathology; D013499:Surface Properties; D013997:Time Factors; D014092:Tooth Root / Q000473:pathology
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C501891:Tetric EvoCeram; D008751:Methylene Blue