Open AccessLoad-Application Devices: A Comparative Strain Gauge Analysis
Author(s) -
Renato Sussumu Nishioka,
Luis Gustavo Oliveira de Vasconcellos,
Renata Pilli Jóias,
Sigmar de Mello Rode
Publication year - 2015
Publication title -
brazilian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.616
H-Index - 50
eISSN - 1806-4760
pISSN - 0103-6440
DOI - 10.1590/0103-6440201300321
Subject(s) - universal testing machine , strain gauge , abutment , materials science , acrylic resin , crown (dentistry) , load cell , implant , load testing , composite material , biomedical engineering , structural engineering , surgery , engineering , medicine , ultimate tensile strength , coating
In view of the low loading values commonly employed in dentistry, a load-application device (LAD) was developed as option to the universal testing machine (UTM), using strain gauge analysis. The aim of this study was to develop a load-application device (LAD) and compare the LAD with the UTM apparatus under axial and non-axial loads. An external hexagonal implant was inserted into a polyurethane block and one EsthetiCone abutment was connected to the implant. A plastic prosthetic cylinder was screwed onto the abutment and a conical pattern crown was fabricated using acrylic resin. An impression was made and ten identical standard acrylic resin patterns were obtained from the crown impression, which were cast in nickel-chromium alloy (n=10). Four strain gauges were bonded diametrically around the implant. The specimens were subjected to central (C) and lateral (L) axial loads of 30 kgf, on both devices: G1: LAD/C; G2: LAD/L; G3: UTM/C; G4: UTM/L. The data (με) were statistically analyzed by repeated measures ANOVA and Tukey's test (p<0.05). No statistically significant difference was found between the UTM and LAD devices, regardless of the type of load. It was concluded that the LAD is a reliable alternative, which induces microstrains to implants similar to those obtained with the UTM.