title: In vitro microbiological bacterial seal analysis of the implant/abutment connection in morse taper implants: a comparative study between 2 abutments.
abstract: OBJECTIVE
  The aim of this study was the comparative evaluation between 2 models of morse taper abutments, with regard to their performance in an in vitro bacterial seal analysis.
  
  
  METHODS
  Twenty-two morse taper implants, Titamax (Neodent, Curitiba, Brazil) CM 3, 75 x 13 mm, 11 CM Universal Post 4.5 x 2 x 2.5 mm, and 11 CM Universal Post Passing Bolt 4.5 x 4 x 2.5 mm were used. The implants were inoculated with 0.3 microL of the 10 concentrated Escherichia coli suspension in their internal screws. The solid posts were closed with 20 N/cm closure torque and the passing bolt posts with 10 N/cm. The assembled specimens were incubated aerobically at 37 degrees C for 7 days, with daily control for cloudiness. The broth in which assembled units showed contamination was diluted at 10 and plated. After incubation, the colonies were counted. Nonparametric Mann-Whitney and Fisher's exact tests were performed.
  
  
  RESULTS
  The results showed no statistically significant difference between groups P and S with respect to number of colonies. When the total number of positive assembled units in each group was compared, no significant difference was found in either groups.
  
  
  CONCLUSIONS
  We concluded that there was no statistically significant difference between the 2 models of abutment in an in vitro bacterial seal analysis.
authors.affiliation: Post Graduation Program in Implant Dentistry, São Leopoldo Mandic Dental School, Campinas, Brazil. madeconto@pop.com.br
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Deconto
authors.forename: Alexander D'Alvia
authors.initials: AD
authors.lastname: Salvoni
authors.forename: Thomaz
authors.initials: T
authors.lastname: Wassall
mesh_terms: D015169:Colony Count, Microbial; D000044:Dental Abutments / Q000382:microbiology*; D015921:Dental Implants / Q000382:microbiology*; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design; D004866:Equipment Contamination; D004926:Escherichia coli / Q000254:growth & development; D006801:Humans; D008422:Materials Testing; D013696:Temperature; D013997:Time Factors; D019415:Torque
chemical_list: D015921:Dental Implants