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

Abstract

This study evaluated “in vitro”, the microstrain around three external hexagon implants linearly placed after static loadings on non-axial points of Co-Cr superstructures. The implants were inserted into a polyurethane block and their microunit prosthetic abutments were screwed with torque of 20 Ncm. Four strain gauges were linked to the block around the implants. Onto the abutments, Co-Cr superstructures (n = 5) were screwed with torque of 10 Ncm. The static vertical loads of 30 kg were applied for 10 s during 3 repetitions in four non-axial points located perpendicularly to the long axis (A and B) and another two points at the extremity of the superstructure (A` and B`). The data were recorded with the aid of a conditioner of electrical signals and the Strain-Smart software. The results obtained were submitted to Analysis of Variance (ANOVA). It could be concluded that there were no significant differences in the effects of the applications of non-axial loads of this present study (p = 0.6464). Also, there were no differences between the displacement means, 3 mm for A and B; 5 mm for A’ and B’ (p = 0.8731). KeywordsBiomechanics, Dental implant, Dental prosthesis.

Influence of Occlusal Loading Location on the Strain Developed Around Implants With Two Different Crest Module Designs (In Vitro Study)

“…In this study two different crest module designs implants were used; micro-threads and wide-groove threads. The overall strains developed around implants of group II ( wide-groove threads crest module design) were higher than those developed around implants of group I (micro threads crest module designs) when vertical loads applied and these differences in the strains were found to be statistically significant Table (2) Figure (4). This is because placing micro-threads on the implant neck greatly increases the surface area of the implant thus decreasing the strain around the implant (Stress= Force/Area) so to reduce stress, the surface area must increase.…”

“…The use of dental implants for oral rehabilitation of either total or partial edentulous arches has been applied to replace lost teeth, depending on the alveolar bone (1). In fixed prosthesis rehabilitation, the occlusal forces are directly applied onto the prosthesis and transmitted to the bone/implant interface and the maintenance of the periimplantar bone tissue should be the primordial fact to achieve long-term treatment success (2).…”

Effect of veneering material on the deformation suffered by implant-supported fixed prosthesis framework

“…Such stresses can lead to bone loss 1 , as well as to other mechanical complications such as the loosening and fracture of the prosthesis screws, fracture of the veneering material, implant fracture, loss of osseointegration, fracture of the framework and fracture or loosening of the abutment 14 , 21 , 28 . The stress is directly related to variables such as the amount of load, incidence of force 20 , size and distribution of implants 9 and extension of the cantilever arm 11 , 17 , which led to search for materials that promote biomechanical balance.…”