Farklı post ve kron materyalleri ile restore edilmiş endodontik tedavili maksiller santral kesici dişlerde stres dağılımı

Year 2015, , 13 - 19, 01.04.2015

Müjde Sevimay Özgün Yusuf Özyılmaz Oğuz Eraslan

https://doi.org/10.15311/1441.272618

Abstract

Amaç: Yapılarında meydana gelebilecek kırılmalardan dolayı endodontik olarak tedavi görmüş dişlerin restorasyonu restoratif diş hekimliğinde yaygın bir problemdir. Oklüzal kuvvetlere dayanabilecek uygun post ve kron materyalinin seçilmesi gereklidir. Bu çalışmanın amacı sonlu elemanlar stres analiz yöntemi kullanarak farklı post ve kron materyallerinin diş restorasyon kompleksindeki stres dağılımını incelemektir.Gereç ve Yöntemler: 2 farklı post materyali (everStick ve cosmopost) ve 2 farklı kron materyali ( IPS Empress e.max ve Cercon) içeren endodontik olarak tedavi edilmiş maksiler santral kesici dişi simüle eden 3-boyutlu sonlu elemanlar modelleri hazırlanmıştır. Sonlu elemanlar modellerinde kök yüzeyindeki tüm noktalar sınır koşulları olarak sabit kabul edilmiştir. 300N’luk statik oklüzal yük kronun palatal yüzeyine 135°’lik bir açıyla uygulanmıştır. Modellerin stres transfer karakteristiklerindeki farklılıklar analiz edilmiştir.Bulgular: Bütün modellerde maksimum stres kuvvet uygulanan alanlarda konsantre olmuştur (10MPa). Cosmopost’ta gözlenen maksimum stresler (2.5MPa) everStick’de gözlenenlerden (1.6 MPa) daha yüksek bulunmuştur. Cercon ve e.max kronların her ikisi için de maksimum stresler kronun bukkal ve lingual marjinlerinde yoğunlaşmıştır (5.8 MPa, 5.0 MPa). Fakat e.max’deki stres değer ve dağılımları Cercon kronla karşılaştırıldığında daha homojen ve daha düşük bulunmuştur.Sonuç: Bu çalışmanın sonuçlarına göre endodontik tedavili bir dişe everStick post uygulanarak e.max seramik ile restore edildiğinde restorasyon-diş kompleksindeki von Mises stresleri azalmaktadır.

Keywords

Post-kor, sonlu elemanlar stres analizi, dental kron

Stress distribution in endodontically treated maxillary central incisor restored with different post and crown materials

Abstract

Background: Restoration of endodontically
treated teeth is a common problem in
restorative dentistry, related to the fractures
occurring in such teeth. It is necessary to obtain
appropriate post and crown material to
withstand occlusal forces. The aim of this study
was to evaluate the influence of different post
and crown materials on the stress distribution of
the restoration tooth complex, using Finite
Element Analysis (FEM).
Methods: 3-D finite element (FE) models
simulating an endodontically treated maxillary
central incisor restored with 2 different post
materials (everstick and cosmopost) and two
different all-ceramic crown materials (IPS
Empress e.max and Cercon) were prepared.
The nodes of the root surfacein the FE models
were fixed in all directions as the boundary
conditions. A 300 N static load was applied to
the palatal surface of the crown with a
135°angle to the long axis of the tooth. The
differences in stress transfer characteristics of
the models were analyzed.
Results: Maximum stress was concentrated on
force application areas for all models (10 MPa).
The stress values observed with cosmopost
(2.5 MPa) were higher than that of everstick (1.6
MPa). Maximum stresses were observed at
buccal and lingual cervical margins of crown for
both Cercon and e.max crowns (5.8 MPa, 5.0
MPa). But the stress values and distribution in
e.max were more homogeneous and lower than
Cercon crown.
Conclusion: The result of this study
demonstrated that use of an everstick post in
endodontically treated teeth restored with e.max
ceramic reduces the values of von Mises
stresses on tooth-restoration complex.

Keywords

Dental crown, finite element analysis, post-core

References

• Akça K, Iplikçioğlu H, 2001. Finite element stress analysis of the influence of staggered versus straight placement of dental implants. Int J Oral Maxillofac Implants, 16, 722–730.
• Akkayan B, Gülmez T, 2002. Resistance to fracture of endodontically treated teethrestored with different post systems. J Prosthet Dent, 87, 431–437.
• Asmussen E, Peutzfeldt A, Sahafi A, 2005. Finite element analysis of stresses in endodontically treated, dowel-restored teeth. J Prosthet Dent, 94, 321–329.
• Assif D, Oren E, Marshak BL, Aviv I, 1989. Photoelastic analysis of stress transfer by endodontically treated teeth to the supporting structure using different restorative materials. J Prosthet Dent, 61, 535–543.
• Ausiello P, Apicella A, Davidson CL, 2002. Effect of adhesive layer properties on stres distribution in composite restorations- a 3D finite element analysis. Dent Mater, 18, 295-303.
• Beer FP, Johnston R, 1993. Chapter6: transformations of stres and strain, mechanics of materials. 2nd SI Metric ed. Singapore: McGraw-Hill International Editions, pp; 367–369.
• Boschian Pest L, Guidotti S, Pietrabissa R, Gagliani M, 2006. Stress distribution in a post-restored tooth using the threedimensional finite element method. J Oral Rehabil, 33,690–697.