EVALUATION OF THE ACCURACY OF TWO IMPLANT-GUIDED POSITIONING SYSTEMS AT BONE MARROW AND CORTICAL DENSITIES: AN IN VITRO STUDY

Abstract

Objective: The aim of the present study is to evaluate the accuracy of implant positioning with two different guided systems (milling and installation kits - with and without drill guides) in bone medullary and cortical densities.

Materials and Methods: 40 conical prosthetic junction implants and 20 blocks of 40PFC and 10PFC dual-density polyurethane were used, simulating medullary and cortical bone, respectively, divided into four groups (Group 1 - System 1 with drill/medullary guide; Group 2 - System 1 with drill guide/Cortical; Group 3 - System 2 without drill/medullary guide; Group 4 - System 2 without drill guide/Cortical). The blocks were scanned and tomographed for digital planning. The implants were positioned through digital planning in each center of density, that is, two implants per block and each of the implants was positioned with 17º of inclination. Two different surgical guides were made for each instrumentation kit. After milling and implant installation, the scanbody was installed on the implants and the blocks were scanned again. The 3D image and the STL file generated from each block were superimposed on the initial virtual planning and the coronal, axial and angular deviation was calculated in the software for each implant.