Finite element analysis studies of an all-ceramic crown on a first premolar.
OBJECTIVE
This study examined the effects of using four different core-ceramic materials on the stresses that developed in a single all-ceramic first premolar crown.


METHODS
This was done by analyzing models constructed in an axisymmetric fashion with finite element analyses. The model had a 600-N vertical load applied uniformly over a circular area on top of the crown. Particular emphasis was placed on the tensile stresses that developed.


RESULTS
For this particular type of model and loading configuration, radial tensile stresses were predominant in magnitude. Peak hoop and axial tensile stresses were approximately 80% and 2% of this value, respectively. The peak radial and hoop tensile stresses were located on the inside of the coping and scaled with the elastic modulus of the coping. For the axial component, the peak was located in the veneer ceramic on its outermost perimeter.


CONCLUSIONS
Under normal loading, a near-uniform tensile stress field developed within the coping, directly beneath the contact area. The magnitude of this stress for realistic bite forces using current design recommendations was significantly lower than the fracture strength of the four ceramic materials investigated. The stresses developed within the porcelain were in all instances well below typical strength values.
Proos
Kaarel A
KA
School of Aerospace, Mechanical and, Mechatronic Engineering, Faculty of Dentistry, Biomaterials Science Research Unit, Suite G11, National Innovation Centre, Australian Technology Park, Eveleigh, New South Wales 1430, Australia. kpro2901@mail.usyd.edu.au
Swain
Michael V
MV
Ironside
Jim
J
Steven
Grant P
GP
D000537:Aluminum Oxide; D001641:Bicuspid; D001732:Bite Force; D003442:Crowns; D003776:Dental Porcelain; D003799:Dental Stress Analysis / Q000379:methods*; D004548:Elasticity; D020342:Finite Element Analysis; D006801:Humans; D008277:Magnesium Oxide; D016876:Metal Ceramic Alloys; D013314:Stress, Mechanical; D013718:Tensile Strength; D015040:Zirconium
D016876:Metal Ceramic Alloys; C111130:spinell; D003776:Dental Porcelain; D008277:Magnesium Oxide; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide