Primary Stability of Dental Implants in Low-Density (10 and 20 pcf) Polyurethane Foam Blocks: Conical vs Cylindrical Implants.

Luca Comuzzi,Margherita Tumedei,Ana Emilia Pontes,Adriano Piattelli,Giovanna Iezzi

doi:10.3390/ijerph17082617

Abstract

Background: The aim of the present study was to compare, in low-density polyurethane blocks, the primary implant stability values (micromobility) and removal torque values of three different implant geometries in two different bone densities representing the structure of the human posterior jaws. Methods: A total of 60 implants were used in the present investigation: twenty implants for each of three groups (group A, group B, and group C), in both polyurethane 10 pcf and 20 pcf densities. The insertion torque, pull-out torque, and implant stability quotient (ISQ) values were obtained. Results: No differences were found in the values of Group A and Group B implants. In both these groups, the insertion torques were quite low in the 10 pcf blocks. Better results were found in the 20 pcf blocks, which showed very good stability of the implants. The pull-out values were slightly lower than the insertion torque values. High ISQ values were found in Group A and B implants. Lower values were present in Group C implants. Conclusions: The present investigation evaluated implants with different geometries that are available on the market, and not experimental implants specifically created for the study. The authors aimed to simulate real clinical conditions (poor-density bone or immediate post-extraction implants) in which knowledge of dental implant features, which may be useful in increasing the primary stability, may help the oral surgeon during the surgery planning.

Highlights

Oral rehabilitation with dental implants represents a highly predictable procedure for partial and full edentulism, characterized by a success rate of over 90% [1]
Regarding the implants for both were of these groups, thevalues insertion torque values were quiteBlow in the 10 pcf blocksthe
Implants for(Figure both of the insertion torque values were quite low in the 10 pcf blocks

Summary

Introduction

Oral rehabilitation with dental implants represents a highly predictable procedure for partial and full edentulism, characterized by a success rate of over 90% [1]. The osseointegration of dental implants is determined by two different processes: the primary stability obtained with the mechanical engagement of the screw with the bone wall of the preparation site, and the secondary stability, due to new bone formation during the healing period [2,3]. The relationship between these two conditions is influenced by the absence of micromovements of the implant after its placement into the preparation site [3]. The authors aimed to simulate real clinical conditions (poor-density bone or immediate post-extraction implants) in which knowledge of dental implant features, which may be useful in increasing the primary stability, may help the oral surgeon during the surgery planning

Objectives

Methods

Discussion

Conclusion