Use of base metal casting alloys for implant framework: marginal accuracy analysis

Kano, Stefania Carvalho; Bonfante, Gérson; Hussne, Raquel; Siqueira, Aline Franco

doi:10.1590/s1678-77572004000400016

Cited by 22 publications

(15 citation statements)

References 7 publications

(5 reference statements)

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“…Various authors have studied the fit of machined titanium abutments and others cast from different materials such as zirconia, concluding that machined titanium and zirconium oxide produce the best fit (11-13). For this reason, machined titanium components were chosen for this study.…”

Section: Discussionmentioning

confidence: 99%

Accuracy combining different brands of implants and abutments

Solá-Ruíz¹,

Selva-Otaolaurruchi²,

Senent-Vicente³

et al. 2013

Med Oral

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Objective: To evaluate the vertical misfit between different brands of dental implants and prosthetic abutments, with or without mechanical torque, and to study their possible combination. Study design: Five different brands of implant were used in the study: Biofit (Castemaggiore, Italy), Bioner S.A. (Barcelona, Spain), 3i Biomet (Palm Beach, U.S.A.), BTI (Alava, Spain) and Nobel Biocare (Göteborg, Sweden), with standard 4.1 mm heads and external hexagons, and their respective machined prosthetic abutments. The implant-to-abutment fit/misfit was evaluated at four points (vestibular, lingual/palatine, mesial and distal) between implants and abutments of the same brand and different brands, with or without mechanical torque, using SEM micrographs at 5000X. Image analysis was performed using NIS-Elements software (Nikon Instruments Europe B.V.). Results: Before applying torque, vertical misfit (microgaps) of the different combinations tested varied between 1.6 and 5.4 microns and after applying torque, between 0.9 and 5.9 microns, an overall average of 3.46±2.96 microns. For manual assembly without the use of mechanical torque, the best results were obtained with the combination of the 3i implant and the BTI abutment. The Nobel implant and Nobel abutment, 3i-3i and BTI-BTI and the combination of 3i implant with BTI or Nobel abutment provided the best vertical fit when mechanical torque was applied. Conclusions: The vertical fits obtained were within the limits considered clinically acceptable. The application of mechanical torque improved outcomes. There is compatibility between implants and abutments of different brand and so their combination is a clinical possibility. Key words:Vertical fit, implant, prosthetic abutment, combination.

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Section: Discussionmentioning

confidence: 99%

Accuracy combining different brands of implants and abutments

Solá-Ruíz¹,

Selva-Otaolaurruchi²,

Senent-Vicente³

et al. 2013

Med Oral

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“…The procedure that attempts to compensate for shrinkage or deformation, the one-piece casting method, waxing was performed directly on the abutment in polyurethane block 8 . Studies to evaluate the fit of the abutment/prosthesis interface have demonstrated that the precision of unitary metallic structures obtained with prefabricated cylinders is better than that obtained with plastic cylinders 2,14 . However, it should be noted that the care involved in handling multiple prostheses is very different from that involved in handling single ones, and the complexity of the laboratory procedures increases proportionally to the number of fixations involved.…”

Section: Discussionmentioning

confidence: 99%

Effect of axial loads on implant-supported partial fixed prostheses by strain gauge analysis

et al. 2011

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ObjectivesThe present study used strain gauge analysis to perform an in vitro evaluation of the effect of axial loading on 3 elements of implant-supported partial fixed prostheses, varying the type of prosthetic cylinder and the loading points. Material and methodsThree internal hexagon implants were linearly embedded in a polyurethane block. Microunit abutments were connected to the implants applying a torque of 20 Ncm, and prefabricated Co-Cr cylinders and plastic prosthetic cylinders were screwed onto the abutments, which received standard patterns cast in Co-Cr alloy (n=5). Four strain gauges (SG) were bonded onto the surface of the block tangentially to the implants, SG 01 mesially to implant 1, SG 02 and SG 03 mesially and distally to implant 2, respectively, and SG 04 distally to implant 3. Each metallic structure was screwed onto the abutments with a 10 Ncm torque and an axial load of 30 kg was applied at five predetermined points (A, B, C, D, E). The data obtained from the strain gauge analyses were analyzed statistically by RM ANOVA and Tukey's test, with a level of significance of p<0.05. ResultsThere was a significant difference for the loading point (p=0.0001), with point B generating the smallest microdeformation (239.49 με) and point D the highest (442.77 με). No significant difference was found for the cylinder type (p=0.748). ConclusionsIt was concluded that the type of cylinder did not affect in the magnitude of microdeformation, but the axial loading location influenced this magnitude.

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“…They found values of 5.6±6.4; 11.1±8.2; 8.0±9.3 and 7.0±3.8 respectively. In a similar previous work, Kano, et al 21 (2004) have measured the vertical misfit at interface of premachined standard abutments and plastic burnout abutments cast with NiCr or CoCr alloys and found values ranging from 4.13±4.29 for the former group to 23,18±6.96 to CoCr group and 25,06±7.75 for NiCr group. Their results are in accordance with this work, when suggest that the laboratory procedures can influence implant/ abutment interface.…”

Section: Discussionmentioning

confidence: 72%

“…Among the factors that contribute to screw instability are misfit of the prosthesis 21 , insufficient tightening force 13,14,26 , screw settling 25 biomechanical overload 26 , and differences in screw material or design 19 .…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclic load on vertical misfit of prefabricated and cast implant single abutment

2011

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ObjectiveThe purpose of this in vitro study was to evaluate misfit alterations at the implant/abutment interface of external and internal connection implant systems when subjected to cyclic loading.Material and MethodsStandard metal crowns were fabricated for 5 groups (n=10) of implant/abutment assemblies: Group 1, external hexagon implant and UCLA cast-on premachined abutment; Group 2, internal hexagon implant and premachined abutment; Group 3, internal octagon implant and prefabricated abutment; Group 4, external hexagon implant and UCLA cast-on premachined abutment; and Group 5, external hexagon implant and Ceraone abutment. For groups 1, 2, 3 and 5, the crowns were cemented on the abutments and in group 4 crowns were screwed directly on the implant. The specimens were subjected to 500,000 cycles at 19.1 Hz of frequency and non-axial load of 133 N in a MTS 810 machine. The vertical misfit (μm) at the implant/abutment interface was evaluated before (B) and after (A) application of the cyclic loading. Data were analyzed statistically by using two-away ANOVA and Tukey’s post-hoc test (p<0.05).ResultsBefore loading values showed no difference among groups 2 (4.33±3.13), 3 (4.79±3.43) and 5 (3.86±4.60); between groups 1 (12.88±6.43) and 4 (9.67±3.08), and among groups 2, 3 and 4. However, groups 1 and 4 were significantly different from groups 2, 3 and 5. After loading values of groups 1 (17.28±8.77) and 4 (17.78±10.99) were significantly different from those of groups 2 (4.83±4.50), 3 (8.07±4.31) and 5 (3.81±4.84). There was a significant increase in misfit values of groups 1, 3 and 4 after cyclic loading, but not for groups 2 and 5.ConclusionThe cyclic loading and type of implant/abutment connection may develop a role on the vertical misfit at the implant/abutment interface.

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Use of base metal casting alloys for implant framework: marginal accuracy analysis

Cited by 22 publications

References 7 publications

Accuracy combining different brands of implants and abutments

Accuracy combining different brands of implants and abutments

Effect of axial loads on implant-supported partial fixed prostheses by strain gauge analysis

Effect of cyclic load on vertical misfit of prefabricated and cast implant single abutment

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