title: The Impact of Conical and Nonconical Abutments on Bacterial Infiltration at the Implant-Abutment Interface.
abstract: This study evaluated the in vitro bacterial microleakage at the implant-abutment interface of three prosthetic connections: external (EH) and internal hexagon (IH) and taper connection (TC: solid [ST], taper with internal hexagon [IT], and short taper [OT]). Escherichia coli (E coli) and Streptococcus sanguinis (S sanguinus) were inoculated in the apical portion of the abutment screw, which was immersed in sterile brain-heart infusion broth for 14 days. There were no differences between the percentages of bacterial infiltration for IH (9.09%), ST (21.74%), IT (22.73%), and OT (11.11%). EH did not present viable bacteria. There were no significant differences in the counts of connections inoculated and not infiltrated by E coli or S sanguinis nor in those infiltrated by both bacteria (one-way analysis of variance, P < .05). Except for EH, all implant designs and abutments showed bacteria that were capable of surviving and causing infiltration.
authors.forename: Elen
authors.initials: E
authors.lastname: Guerra
authors.forename: Cristiane
authors.initials: C
authors.lastname: Pereira
authors.forename: Renata
authors.initials: R
authors.lastname: Faria
authors.forename: Antonio Olavo
authors.initials: AO
authors.lastname: Jorge
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
authors.forename: Renata Marques
authors.initials: RM
authors.lastname: de Melo
mesh_terms: D000044:Dental Abutments / Q000382:microbiology*; D059605:Dental Implant-Abutment Design; D015921:Dental Implants / Q000382:microbiology*; D003763:Dental Leakage; D004866:Equipment Contamination; D004926:Escherichia coli; D066298:In Vitro Techniques; D008422:Materials Testing; D013298:Streptococcus sanguis; D013499:Surface Properties
chemical_list: D015921:Dental Implants