Stiklo pluošto kaiščių ir "movos" efekto biomechanikos analizė baigtinių elementų metodu. Sisteminė literatūros apžvalga.

Summary Objectives: The aim of this study is to present a review of the contemporary literature regarding the finite element method used in dentistry, the positive effect of ferrule and glass fiber restoration and type of software that was used to create 3D models. Material and Methods: Three different databases were investigated during literature search. A total amount of 407 articles from PubMed (2009-2018), ScienceDirect (2009-2018) and Google Scholar (2014-2018) were investigated by title and abstract as shown in study flow below. (Fig. 1) In addition to the electronic search, a hand search of reference lists, of full articles was made. Results: This study compared glass fibre posts with other types of posts, usually metal and the positive effect of ferrule preparation over the restored tooth. The final results show that GFP and ferrule effect have positive influence on stress distribution. The only exception were mandibular lateral incisors which show worse fracture resistance properties when additional preparation of the endodontically treated tooth was performed. Conclusions: Ferrule effect seem to have very good prognosis for teeth restored with glass fibre posts. Endodontically treated teeth with higher and uniform ferrule show lower stresses at adhesive interfaces, that may lead to decrease the chance of clinical failure. Restorations with glass fiber posts without ferrule effect had much higher Maximum principal stress values (Mpa) compared to teeth restored with ferrule effect. Teeth restored without ferrule were more prone to increased stresses and risk of fracture. The absence of a ferrule was directly related with increased strain values on buccal and proximal surfaces for cast post and core. Post length did not have influence for stress distribution in the dental tissues. So far we can terminate that there are several correct ways to perform the FEA if the results obtained are reliable. It can be suggested to create a protocol to follow when analysing tissues with FEA, this would provide more transparent and understandable records