Evaluation of impression accuracy for implant at various angulations.
OBJECTIVE
The purpose of this study was to compare 2 splinted impression transfer techniques for implant-supported prostheses.


METHODS
A metal matrix (control) with 4 implants was used. The implants were positioned at 90, 80, 75, and 65 degrees in relation to the surface of the matrix. Squared impression copings were splinted with self-curing acrylic resin in group 1 (n = 10) and with condensation silicone in group 2 (n = 10). A computer software was used to measure the implants/analogs inclinations. Data were analyzed by 2-way analysis of variance and Tukey test (alpha <0.05).


RESULTS
There was significant difference between groups, implant/analog inclinations, and interaction between them (P < 0.05). Group 1 had no significant difference from the control (P > 0.05) nor from group 2 (P > 0.05) regardless implant/analog inclinations. Considering implant/analog inclinations, both techniques did not differ from control group (P > 0.05), except for 75 degrees implant/analog inclinations (P < 0.05).


CONCLUSIONS
The results suggest that condensation silicone may not be used as an alternative splinting material. Furthermore, implant inclination may affect master cast accuracy.
Assunção
Wirley Gonçalves
WG
Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Araçatuba Dental School, São Paulo, Brazil 16015-050. wirley@foa.unesp.br
Britto
Rebeca Cavalcante
RC
Ricardo Barão
Valentim Adelino
VA
Delben
Juliana Aparecida
JA
dos Santos
Paulo Henrique
PH
D000180:Acrylic Resins / Q000737:chemistry; D002133:Calcium Sulfate / Q000737:chemistry; D015921:Dental Implants; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000592:standards*; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D006801:Humans; D006813:Humidity; D003765:Models, Dental; D012828:Silicones / Q000737:chemistry; D012984:Software; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
D000180:Acrylic Resins; D015921:Dental Implants; D003760:Dental Impression Materials; D003764:Dental Materials; D012828:Silicones; D002133:Calcium Sulfate