Experimental Research on Zirconia Resistance to Occlusal Stresses

Abstract

FEM studies were made on a zirconia dental bridge of 4 elements with supports on 2.4 and 2.7, and edentation on 2.5 and 2.6. Appling a compressive force of 350N on Z direction, quite normal for mastication, was analyzed the behavior of the dental bridge. Zirconia, although having a high mechanical strength, is fragile when rotation or bending movements occur. The analysis reveals some bridge deficiencies, which may be due either to inaccuracies in the prosthetic abutment construction (especially in relation to their inclination), to the technique of realization or to insufficient dental support. In our study, the most vulnerable elements are the crowns on teeth 2.4 and 2.7. Finite element analysis, highlighting possible structural and design deficiencies, may be a solution to improve dental bridges. The only disadvantage of the finite element analysis that was performed before the actual restoration is related to the fact that performing the simulations involves a time-consuming phase.

Experimental Studies Regarding the Distribution of the Masticatory Pressures According to the Turn�s Length of the Dental Implants

“…Finite element analysis is an currently experimental method used more and more frequently in the field of dental medicine [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] to estimate the behaviour of biomaterials and human tissues. The use of engineering expertise in dentistry has partly helped to understand the biomechanical aspects related to the osseointegration of the implants [1].…”

In vitro Comparative Tests About the Biocompatibility of Some Dental Alloys

“…A material is considered as biocompatible when it does not harm nor create toxic reactions or systemic side effects. For saliva and dental tissues media, which a dental restoration comes into contact it is of extremely importance the proper knowledge of the changes which can occur in time at the materials level [4]. Interactions of dental cast alloys with the oral tissues take place by different mechanisms leading to bacterial adherence promotion, toxic and subtoxic effects and allergy.…”

Variation of Static Frictional Forces in the Fixed Orthodontic System

“…Consequently, this has led to an increased demand for fixed orthodontic appliances that are both aesthetic and efficient in terms of treatment duration. Dental materials used in the treatment of oral pathology have to fulfill several properties, such as biocompatibility [3,4], homogeneity [5][6][7][8][9][10], strength [2,[11][12][13][14][15][16][17][18][19][20][21], aesthetics [1], corrosion and degradation resistance [22][23][24][25] indifferent of the general status health of the patient [26,27].…”