title: Microleakage of different sealing materials in access holes of internal connection implant systems.
abstract: BACKGROUND
  Current implant systems cannot completely prevent microleakage from the access holes of screw-retained implant prostheses, which may constitute risks to the clinical success of the implants.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the levels of microleakage through the access holes of screw-retained implant prostheses sealed with different materials.
  
  
  METHODS
  An implant with an internal hexagonal configuration was connected to a temporary abutment with an acrylic resin crown. The apical 6.5 mm of the access hole was filled with 1 of the following materials: cotton pellet, silicone sealing material, vinyl polysiloxane, or gutta-percha. The remaining coronal 3 mm was sealed with composite resin. Cyclic loading with 21 N at 1 Hz was applied 16,000 times to the specimens in 0.5% basic fuchsin solution according to the long axis of the tooth. Basic fuchsin dye which penetrated into the internal wall of the abutment through the access hole was dissolved with methyl alcohol. Then the absorbance was measured by a spectrophotometer at 540 nm to evaluate the degree of microleakage. The results were statistically analyzed with 1-way ANOVA and the Tukey HSD test.
  
  
  RESULTS
  From greatest to least, the levels of microleakage were in the following order: cotton pellet, silicone sealing material, vinyl polysiloxane, and gutta-percha. The microleakage associated with gutta-percha was not significantly different from that of vinyl polysiloxane.
  
  
  CONCLUSIONS
  When sealing the access holes of screw-retained implant prostheses, gutta-percha or vinyl polysiloxane would help reduce microleakage.
authors.affiliation: Department of Prosthodontics, College of Dentistry, Wonkwang University, Iksan, Korea.
authors.forename: Sung-Do
authors.initials: SD
authors.lastname: Park
authors.forename: Yoon
authors.initials: Y
authors.lastname: Lee
authors.forename: Yu-Lee
authors.initials: YL
authors.lastname: Kim
authors.forename: Sang-Hui
authors.initials: SH
authors.lastname: Yu
authors.forename: Ji-Myung
authors.initials: JM
authors.lastname: Bae
authors.forename: Hye-Won
authors.initials: HW
authors.lastname: Cho
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D003738:Dental Cements; D015921:Dental Implants; D003763:Dental Leakage / Q000517:prevention & control; D019094:Dental Prosthesis, Implant-Supported / Q000295:instrumentation; D006171:Gutta-Percha; D006801:Humans; D008963:Molar; D011145:Polyvinyls; D012387:Root Canal Filling Materials; D012828:Silicones; D012833:Siloxanes; D018709:Statistics, Nonparametric
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D015921:Dental Implants; D011145:Polyvinyls; D012387:Root Canal Filling Materials; D012828:Silicones; D012833:Siloxanes; C034183:vinyl polysiloxane; D006171:Gutta-Percha