[The finite element analysis of stress distribution in different size of MO cavities restored with composite resin inlays].
OBJECTIVE
To explore the effect of different depth and width of meiso-occlusal (Class II) cavity type on the tooth tissue resistance stress after restoration with composite resin inlays.


METHODS
The 3-D finite element model of mandibular first molar with meiso-occlusal (Class II) cavity restored with composite resin inlay was established by using CBCT scanning and reverse engineering software Mimics, Geomagic Studio, and finite element analysis software ANSYS. Comparative analysis of restoration with different depth and width meiso-occlusal (Class II) cavity under the same load of perpendicular and 45° deviation was explored, and finally the main stress and Von-mises stress changed as well as stress distribution were analyzed.


RESULTS
The main stress was located in the gingival wall opposite to the inlay, while the major stress concentration area of the tooth was distributed near the canal at the bottom of the cavity. With the increase of the depth and width, the main stress and Von-mises stress distribution areas of tooth were getting larger. The Von-mises stress of tooth was influenced by the width variation of the cavity, while that depth change of cavity was affected by Von Mises stress of the inlay.


CONCLUSIONS
With the increase of the depth and width of the cavity as well as lateral loading force, the peak stress of tooth with inlays increased and the distribution of stress concentration is modified after meiso-occlusal (Class II) cavity being inlayed with composite resin.
Department of Stomatology, First Affiliated Hospital of Xi'an Jiaotong University. Xi'an 710061; China.E-mail:longz.zl@qq.com.
Long
L
Zhang
Yi
Y
Lu
Bo-song
BS
Yang
Yan
Y
Guo
Fang-ping
FP
Li
D003188:Composite Resins; D003198:Computer Simulation; D003731:Dental Caries; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D005881:Gingiva; D006801:Humans; D007284:Inlays; D008963:Molar; D013314:Stress, Mechanical; D014070:Tooth
D003188:Composite Resins; D003776:Dental Porcelain