Deformation of implant abutments after framework connection - a study with strain gauges

Effect of Framework Soldering on the Deformation of Implant Abutments After Framework Seating

“…(Implant Dent 2013; 22:193-198) Key Words: passive fit, dental implants, casting other can affect the fit of a framework, it is expected that the abutments will present different levels of deformation, as a result of framework connection. 7,12,14,17 Even in the presence of a minimum misfit, nonaxial tension forces are generated on the implant components upon tightening of the screws. These generated tension forces are called external preload.…”

“…23,26,[29][30][31][32] Previous strain gauge studies have demonstrated that multiple retainer frameworks cast in one piece produce uneven deformations among the abutments and that the absence of a microgap, per se, is not necessarily an indication of passivity. 7,33 This study aimed at comparing the results of the deformation obtained when framework superstructures were cast in one piece, whereas others were severed, sectioned, and then soldered, after which they were seated to implant abutments.…”

“…[1][2][3] When fit is unsatisfactory, tensile, compressive, and bending forces may be introduced into the system that may result in the loosening of the prosthesis, loosening of abutment screws, 2,4-6 distortion or breakage of the restoration, and microfractures of the implant body. 7 Even the loss of osseointegration may occur. 8 In the tightening process, the screw elongates, bringing the implant/abutment and/or abutment/prosthetic cylinder together, creating a clamping force, [9][10][11][12] also known as preload, which is generated by the rotational torque force.…”

“…11 The deformation resultant of this compression should be measurable and uniform along the periphery of the abutment and is influenced by the fit between the abutment and cylinder. 7 Considering that multiple retainers connected to each Introduction: Passive fit has been considered an important requirement for the longevity of implantsupported prostheses. Among the different steps of prostheses construction, casting is a feature that can influence the precision of fit and consequently the uniformity of possible deformation among abutments upon the framework connection.…”

Strain Gauge analysis of non-axial loads in three-element implant-supported prostheses

“…The use of superstructures in implantsupported prostheses casted in Co-Cr alloy is equally acceptable to the employment of Pd-Ag alloy because of its low cost, biocompatibility and durability so that it was the alloy type chosen by this present study [41].…”