Machined and plastic copings in three-element prostheses with different types of implantabutment joints: a strain gauge comparative analysis
J. appl. oral sci
;
18(3): 225-230, May-June 2010. ilus
Artigo
em Inglês
| LILACS
| ID: lil-557084
ABSTRACT
OBJECTIVE:
Using strain gauge (SG) analysis, the aim of this in vitro study was quantify the strain development during the fixation of three-unit screw implant-supported fixed partial dentures, varying the types of implant-abutment joints and the type of prosthetic coping. The hypotheses were that the type of hexagonal connection would generate different microstrains and the type of copings would produce similar microstrains after prosthetic screws had been tightened onto microunit abutments. MATERIALS ANDMETHODS:
Three dental implants with external (EH) and internal (IH) hexagonal configurations were inserted into two polyurethane blocks. Microunit abutments were screwed onto their respective implant groups, applying a torque of 20 Ncm. Machined Co-Cr copings (M) and plastic prosthetic copings (P) were screwed onto the abutments, which received standard wax patterns. The wax patterns were cast in Co-Cr alloy (n=5), forming four groups G1) EH/M; G2) EH/P; G3) IH/M and G4) IH/P. Four SGs were bonded onto the surface of the block tangentially to the implants, SG 1 mesially to implant 1, SG 2 and SG 3 mesially and distally to implant 2, respectively, and SG 4 distally to implant 3. The superstructure's occlusal screws were tightened onto microunit abutments with 10 Ncm torque using a manual torque driver. The magnitude of microstrain on each SG was recorded in units of microstrain (µε). The data were analyzed statistically by ANOVA and Tukey's test (p<0.05).RESULTS:
Microstrain values of each group were G1= 338.1±223.0 µε; G2= 363.9±190.9 µε; G3= 415.1±53.5 IE; G4= 363.9±190.9 µε. No statistically signifcant difference was found between EH and IH, regardless of the type of copings (p>0.05). The hypotheses were partially accepted.CONCLUSIONS:
It was concluded that the type of hexagonal connection and coping presented similar mechanical behavior under tightening conditions.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Implantes Dentários
/
Dente Suporte
/
Planejamento de Prótese Dentária
/
Prótese Dentária Fixada por Implante
/
Materiais Dentários
/
Prótese Parcial Fixa
Limite:
Humanos
Idioma:
Inglês
Revista:
J. appl. oral sci
Assunto da revista:
Odontologia
Ano de publicação:
2010
Tipo de documento:
Artigo
/
Documento de projeto
País de afiliação:
Brasil
Instituição/País de afiliação:
CETEC/BR
/
São Paulo State University/BR
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