Influence of abutment materials on the implant-abutment joint stability in internal conical connection type implant systems

Abstract

PURPOSEThis study evaluated the influence of abutment materials on the stability of the implant-abutment joint in internal conical connection type implant systems.MATERIALS AND METHODSInternal conical connection type implants, cement-retained abutments, and tungsten carbide-coated abutment screws were used. The abutments were fabricated with commercially pure grade 3 titanium (group T3), commercially pure grade 4 titanium (group T4), or Ti-6Al-4V (group TA) (n=5, each). In order to assess the amount of settlement after abutment fixation, a 30-Ncm tightening torque was applied, then the change in length before and after tightening the abutment screw was measured, and the preload exerted was recorded. The compressive bending strength was measured under the ISO14801 conditions. In order to determine whether there were significant changes in settlement, preload, and compressive bending strength before and after abutment fixation depending on abutment materials, one-way ANOVA and Tukey's HSD post-hoc test was performed.RESULTSGroup TA exhibited the smallest mean change in the combined length of the implant and abutment before and after fixation, and no difference was observed between groups T3 and T4 (P>.05). Group TA exhibited the highest preload and compressive bending strength values, followed by T4, then T3 (P<.001).CONCLUSIONThe abutment material can influence the stability of the interface in internal conical connection type implant systems. The strength of the abutment material was inversely correlated with settlement, and positively correlated with compressive bending strength. Preload was inversely proportional to the frictional coefficient of the abutment material.

Effect of Coated Surfaces influencing Screw Loosening in Implants: A Systematic Review and Meta-analysis

“…With an increase in this wear, there is a subsequent decrease in the detorque values, and during further prosthetic loading, the screw loses its threshold limit to engage into the grooves, and it either starts revolving around its own axis or tends to fracture. [7][8][9] Factors related to screw loosening are various, including poor tightening (inadequate preload), inaccurate fit of framework, poor component fit, flexure of framework, settling, debris trapped in screw receptor, screw design, and bone elasticity. 4,10,11, Various methods to combat this potential problem of screw loosening would include ensuring an adequate preload which supersedes the masticatory force, proper fit of the component, a considerably rigid framework, care taken to prevent entrapment of debris at the screw receptor site, choosing an appropriate screw design based on the nature of the bone, and coating of abutment screws.…”

Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

“…On the other hand, some studies support the superiority of the conical connection over the internal and the external hexagon, as the micro‐motions of the prosthetic abutment, the expanding of the micro‐gaps under pressure and the industrial stability are concerned . The conical connection (Figure ) is the type of internal connection that minimizes the gap between implant and prosthetic abutment with a Morse taper fit (conus in conus).…”

Mechanism of and factors associated with the loosening of the implant abutment screw: A review

“…Abutment material could also influence the stability of the implant‐abutment connection. Jo et al compared the stability of the joint of three abutments made of commercially pure grade 3 titanium (group T3), commercially pure grade 4 titanium (group T4), or Ti‐6Al‐4V (group TA). It was found that preload and compressive bending strength values were significantly higher in group TA in contrast to groups T3 and T4.…”