Stress-strain analysis of an abutment tooth with rest seat prepared in a composite restoration

Ljiljana Tihaček Šojić (Author), Aleksandra M Lemić (Author), Dragoslav Stamenković (Author), Vojkan Lazić (Author), Rebeka Rudolf (Author), Aleksandar Todorović (Author)

Abstract

Placing a composite restoration on abutments for the removable of partial dentures gives favorable aesthetic results with minimal intervention. The objective of this paper is to analyze the stress distribution of a tooth with occlusal rest-seat preparation in the composite and compare it to the biomechanical behavior of an intact tooth, assuming that the stress and strain distribution throughout the intact tooth provides the control scenario. For this finite-element study two different models were designed. The first model was the three-dimensional (3D) model of an intact tooth, and the other one was a 3D model of a tooth with a composite restoration and an appropriate occlusal rest-seat preparation. Load stimulations were performed when the rest was fully seated on its corresponding rest seat and abutment tooth in order to obtain data about the biomechanical behavior of the abutment tooth compared to the intact toothćs stress-distribution pattern. The results of our analyses are presented and analyzed qualitatively. The occlusal loading effect along the sound tooth exhibits a wider high-stress area, localized in correspondence with the occlusal enamel, than the restored teeth. This is due to the rigidity of the enamel. The reduction in the stress values occurs in the composite restoration, which is less rigid. Its lower rigidity allows larger cusp movements. The stress-distribution pattern of the restored tooth with the rest seat showed that introducing an occlusal restoration does not differ from the intact tooth globally, but locally. Our findings indicate that the composite rest-seat restoration absorbs the loading, so reducing the stresses inside the tooth's structure.

Keywords

composite rest seat;abutment tooth;stress distribution;finite element method;

Data

Language:	English
Year of publishing:	2011
Typology:	1.01 - Original Scientific Article
Organization:	UM FS - Faculty of Mechanical Engineering
Publisher:	Inštitut za kovinske materiale in tehnologije Ljubljana
UDC:	616.31:539.3
COBISS:	15631638
ISSN:	1580-2949
Views:	544
Downloads:	26
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Other data

Secondary language:	Slovenian
Secondary title:	Napetostno-deformacijska analiza opornega zoba z zapornim sedežem, izdelana s kompozitnim popravilom
Secondary abstract:	Postavitev kompozitnega popravila opore za odstranljive dele zobovja daje dobre estetske rezultate z minimalno intervencijo. Cilj tega članka je analizirati porazdelitev napetosti na zobu z zapornim sedežem s kompozitno zaporo in jo primerjati z biomehanskim vedenjem intaktnega zoba s predpostavko, da odloča razdelitev napetosti in deformacije intaktnemu zobu. Za to študijo sta bila na podlagi končnih elementov razvita dva različna modela. Prvi je tridimenzionalen (D) model intaktnega zoba, drugi pa je 3D-model zoba s kompozitno restoracijo in ustrezno pripravo zapornega sedeža, da bi tako dobili podatke o biomehanskem vedenju mostičnega opornika in o porazdelitvi napetosti v intaktnem zobu. Rezutati so prikazanai in analiziranikvalitativno. Zaporna obremenitev povzroči široko področje visoke napetosti v zdravem zobu zaradi stika s sklenino in ne restoriranega zoba. To je posledica velike togosti sklenine. Manjše so napetosti v manj togi kompozitni restoraciji, kar omogoča večje premik opornega vrha. Porazdelitev napetosti restoriranega zoba z opornim sedežem kaže, da uporaba zaporne restoracije ne vpliva globalno, ampak lokalno. Ugotovitve kažejo, da popravilo zob z oporo absorbira obremenitev, ker zmanjša napetosti v strukturi zoba.
Secondary keywords:	kompozitna opora;oporni zob;porazdelitev napetosti;FEM;
URN:	URN:NBN:SI:DOC-XWU27QAY
Type (COBISS):	Scientific work
Pages:	str. 561-566
Volume:	Letn. 45
Issue:	št. 6
Chronology:	2011
ID:	1728566