Abstract
ObjectiveUsing 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 and methodsThree 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).ResultsMicrostrain values of each group were: G1= 338.1±223.0 µε; G2= 363.9±190.9 µε; G3= 415.1±53.5 µε; G4= 363.9±190.9 µε. No statistically significant difference was found between EH and IH, regardless of the type of copings (p>0.05). The hypotheses were partially accepted.ConclusionsIt was concluded that the type of hexagonal connection and coping presented similar mechanical behavior under tightening conditions.
Highlights
Osseointegrated dental implants have been a well-accepted and predictable treatment modality for rehabilitation of partially and completely edentulous patients
The hypotheses were that type of hexagonal connection would generate different microstrains and type of copings would produce similar microstrains after prosthetic screws were tightened onto microunit abutments
To ensure the success of a surgical intervention, a factor that must be taken into account is the transfer of stresses and strains occurs around bone3,8,9,10,25,26
Summary
Osseointegrated dental implants have been a well-accepted and predictable treatment modality for rehabilitation of partially and completely edentulous patients. An implant-supported prosthesis may EH XQGHU WKH LQÀXHQFH RI H[WHUQDO IXQFWLRQDO RU parafunctional) and/or internal (preload) forces. The magnitude of this forces affects the amount of induced strains and stresses in all components of bone-implant-prosthesis complex. Torque of the prosthesis-abutment set induces stresses which are transmitted to the supporting bone The aim of this in vitro study was quantify the VWUDLQ GHYHORSPHQW GXULQJ WKH ¿[DWLRQ RI WKUHHXQLW VFUHZ LPSODQWVXSSRUWHG ¿[HG SDUWLDO GHQWXUHV )3'V XVLQJ 6* DQDO\VLV 7KH LQÀXHQFH RI W\SHV of implant-abutment joints (external and internal hexagon) and type of prosthetic coping (machined and plastic) was investigated. The hypotheses were that type of hexagonal connection would generate different microstrains and type of copings would produce similar microstrains after prosthetic screws were tightened onto microunit abutments
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
