Применение методов математического моделирования для решения задач клинической медицины. Скрипаль А.В. - 68 стр.

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Several methods have been used to analyze the effect of the post-core system on

the stress distribution in the dentine. Experimental and finite element methods are

commonly used.

Experimental methods have included:

1) tensile test,

2) shear loading test and,

3) photoelastic analysis.

In a nutshell, restorations involving endodontical posts have been investigated

clinically, experimentally and theoretically.

It is a clinical observation that endodontically treated teeth are more fragile

than teeth with vital pulp. A few clinical studies (Sorensen & Martinoff, 1984;

Lewis & Smith, 1988; Mentink, Meeuwissen & Ka¨ yser, 1993; Morgano &Milot,

1993) show that the main causes of failure have been identified as: post-distortion,

caries, loss of retention of the post, root fracture, loss of retention of the crown

and post-distortion. Although several factors are involved, some of these failures

are related to the mechanical properties of the posts. Asmussen, Peutzfeldt &

Heitmann (1999) measured the stiffness, the elastic limit, and the strength of a

selection of endodontic posts recently introduced in to the market. The posts under

investigation differed significantly with respect to their mechanical properties.

The dentin in endodontically treated molars was found to be weaker and more