Three-dimensional finite element analysis of strain and stress distributions in endodontically treated maxillary central incisors restored with different post, core and crown materials.
OBJECTIVE
The present comparative analysis aimed at evaluating which combination of restorative materials resulted in the most homogeneous stress and strain distributions.


METHODS
A three-dimensional finite element analysis was performed. All the nodes on the external surface of the root were constrained in all directions. Eighteen experimental models with different material properties and configurations were simulated. An arbitrary load of 10N was applied at 60 degrees angle with tooth longitudinal axis on the palatal surface of the crown. Von Mises (equivalent stresses) energetic criterion was chosen.


RESULTS
In all the models the values of both strain and stress recorded at the middle third of the buccal aspect of the root surface were at their maxima. On the contrary, the minimum values were noticed at level of both the apical portion of the post and the root apex. The maximum stresses were evidenced at level of the cemento-enamel junction (CEJ) on both the buccal and palatal aspects of root cement and dentin. Stress progressively decreased from the outer to the inner part of the root and from the CEJ towards the incisal margin of the crown as well.


CONCLUSIONS
The results of the present study would allow clinicians to make an informed choice from among available materials to restore endodontically treated teeth.
Sorrentino
Roberto
R
Department of Restorative Dentistry and Dental Materials, University of Siena, Siena, Italy.
Aversa
Raffaella
R
Ferro
Valeria
V
Auriemma
Tommaso
T
Zarone
Fernando
F
Ferrari
Marco
M
Apicella
Antonio
A
D002484:Cementation; D003188:Composite Resins / Q000737:chemistry*; D003198:Computer Simulation; D003442:Crowns; D003799:Dental Stress Analysis / Q000379:methods*; D003804:Dentin / Q000502:physiology; D004548:Elasticity; D020342:Finite Element Analysis; D005898:Glass; D006801:Humans; D007180:Incisor; D008437:Maxilla; D018583:Pliability; D011176:Post and Core Technique; D033081:Shear Strength; D019237:Tooth Cervix / Q000503:physiopathology*; D014092:Tooth Root / Q000503:physiopathology; D019553:Tooth, Nonvital / Q000503:physiopathology
D003188:Composite Resins; C009753:fiberglass