Novel non-invasive reinforcement of MOD cavities on endodontically treated teeth.
To evaluate the biomechanical influence of reconnecting the buccal and lingual walls of endodontically treated lower molar with a large MOD cavity.



3D models were created from a micro-CT scan of an extracted intact lower human molar. Finite element analysis was then used to compare the stress distribution and displacement of the structures between different models: Unrestored MOD on ETT (Unrest), MOD on ETT restored with composite resin (Norm), MOD on ETT reinforced with a non-invasive ring (Ring) and intact tooth as the control (Int).



This study showed that the Unrest model presented the highest stress values at the cervical level. The non-invasive Ring model showed the lowest stress values at the cervical level, and the lowest deflection of the cusps.



Mechanically reconnecting the remaining tooth structures has a direct positive effect on stress distribution and deformation of the remaining structures.



Reinforcing ETT in a non-invasive direct approach is efficient in terms of preserving sound tooth structures, reducing the time of treatment and eliminating the laboratory steps required to create the restorations.
Department of Cariology and Endodontology, University of Geneva, 19 Rue Barthélemy-Menn, CH-1205 Geneva, Switzerland. Electronic address: rene.daher@unige.ch.
René
R
Daher
Department of Dental Materials Sciences, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands. Electronic address: a.feilzer@acta.nl.
Albert J
AJ
Feilzer
Department of Cariology and Endodontology, University of Geneva, 19 Rue Barthélemy-Menn, CH-1205 Geneva, Switzerland. Electronic address: ivo.krejci@unige.ch.
Ivo
I
Krejci
D003188:Composite Resins; D003737:Dental Cavity Preparation; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D014082:Tooth Fractures; D019553:Tooth, Nonvital
D003188:Composite Resins
Conservative; Cuspal deflection; Endodontically treated; Fiber reinforced; MOD cavity; Non-invasive