The effect of marginal preparation type on an all-ceramic anterior crown: A finite element study

Ayşe Gözde TÜRK, Sena ÜNAL
2.159 289


Objectives: The aim of the study was to evaluate and compared the effects of 2 different tooth preparation designs on the stress distribution in tooth, cement, core and two ceramic layers of all ceramic anterior crown using the 3 Dimensional (3D) Finite-Element-Analysis (FEA) method. Anterior tooth-crown configuration composed of both layers of restoration is lacking.

Materials and Methods: One mm circumferential shoulder and chamfer finish line preparations were performed with rounded shoulder and chamfer diamond cylindrical burs with rounded angles on 2 maxillary central teeth. One mm thickness of the frameworks were (IPS e.max Press, Ivoclar-Vivadent, Schaan, Liechtenstein) prepared by pressing technique. After scanning the frameworks for FEA, dentin and enamel ceramics (IPS e.max Ceram, Ivoclar-Vivadent) were applied. Each ceramic layer was scanned for finite-element models. The Variolink II (Ivoclar-Vivadent) was used as a luting material and modeled. A 200 N static load was applied at 45° to the palatal surface. 3D-FEA was performed with I-DEAS software.

Results: Rounded-shoulder model shows higher Von Mises stress values in prepared tooth, core, resin cement, and both two layers of the ceramic than chamfer model. Rounded-shoulder preparation type within all evaluated models had more dispersed stress distribution localization areas than chamfer preparation type’s models. The highest Von-Mises stress values were found within the first ceramic layer of the shoulder model (26.5 MPa) on 1/3 of the buccal surface. Low stress values were found at dentin tooth structures for both chamfer and rounded-shoulder models.

Conclusions: Rounded-shoulder preparation type showed higher Von-Mises stress values at both layers of crown. Minimum Von-Mises stress values were found at dentin regardless of the preparation type.


All-ceramic; finite element analysis; preparation; crown.

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Rafferty BT, Janal MN, Zavanelli RA, Silva NR, Rekow ED, Thompson VP, Coelho PG. Design features of a three-dimensional molar crown and related maximum principal stress. A finite element model study. Dent Mater 2010;26:156-163.

Tang X, Tang C, Su H, Luo H, Nakamura T, Yatani H. The effects of repeated heat-pressing on the mechanical properties and microstructure of IPS e.max Press. J Mech Behav Biomed Mater 2014;40:390-396.

Beschnidt SM, Strub JR. Evaluation of the marginal accuracy of different all-ceramic crown systems after simulation in the artificial mouth. J Oral Rehabil 1999;26:582-593.

Campos RE, Soares CJ, Quagliatto PS, Soares PV, de Oliveira OB Jr, Santos-Filho PC, Salazar-Marocho SM. In vitro study of fracture load and fracture pattern of ceramic crowns: a finite element and fractography analysis. J Prosthodont 2011;20:447-455.

Drummond JL, King TJ, Bapna MS, Koperski RD. Mechanical property evaluation of pressable restorative ceramics. Dent Mater 2000;16:226-233.

Mak M, Qualtrough AJ, Burke FJ. The effect of different ceramic materials on the fracture resistance of dentin-bonded crowns. Quintessence Int 1997;28:197-203.

Raigrodski AJ. Contemporary materials and technologies for all-ceramic fixed partial dentures: A review of the literature. J Prosthet Dent 2004;92:557-562.

Zarone F, Russo S, Sorrentino R. From porcelain-fused-to-metal to zirconia: Clinical and experimental considerations. Dent Mater 2011;27:83-96.

Proos KA, Swain MV, Ironside J. Influence of margin design and taper abutment angle on a restored crown of a first premolar using finite element analysis. Int J Prosthodont 2003;16:442-449.

Coelho PG, Silva NR, Bonfante EA, Guess PC, Rekow ED, Thompson VP. Fatigue testing of two porcelain-zirconia all-ceramic crown systems. Dent Mater 2009;25:1122-1127.

Coelho PG, Bonfante EA, Silva NR, Rekow ED, Thompson VP. Laboratory simulation of Y-TZP all-ceramic crown clinical failures. J Dent Res 2009;88:382-386.

Shinya A, Lassila LVJ, Vallittu PK. The effect of preparation design on the marginal stress of resin-bonded metal-free crowns: a finite element study. Int J Prosthodont 2008;21:445-447.

Jager ND, Pallav P, Feilzer AJ. The influence of design parameters on the FEA-determined stress distribution in CAD–CAM produced all-ceramic dental crowns. Dent Mater 2005;21:242-251.

Oyar P, Ulusoy M, Eskitaşçıoğlu G. Finite element analysis of stress distribution in ceramic crowns fabricated with different tooth preparation designs. J Prosthet Dent 2014;112:871-877.

Zarone F, Apicella D, Sorrentino R, Ferro V, Aversa R, Apicella A. Influence of tooth preparation design on the stress distribution in maxillary central incisors restored by means of alumina porcelain veneers: a 3D-finite element analysis. Dent Mater 2005;21:1178-1188.

Rekow ED, Harsono M, Janal M, Thompson VP, Zhang G. Factorial analysis of variables influencing stress in all-ceramic crowns. Dent Mater 2006;22:125-132.

Seymour KG, Cherukara GP, Samarawickrama DY. Stresses within porcelain veneers and the composite lute using different preparation designs. J Prosthodont 2001;10:16-21.

Shahrbaf S, vanNoort R, Mirzakouchaki B, Ghassemieh E, Martin N. Effect of the crown design and interface lute parameters on the stress-state of a machined crown-tooth system: a finite element analysis. Dent Mater 2013;29:e123-131.

Li Z, Yang Z, Zuo L, Meng Y. A three-dimensional finite element study on anterior laminate veneers with different incisal preparations. J Prosthet Dent 2014;112:325-333.

Contrepois M, Soenen A, Bartala M, Laviole O. Marginal adaptation of ceramic crowns: A systematic review. J Prosthet Dent 2013;110:447-454.

Euán R, Figueras-Álvarez O, Cabratosa-Termes J, Brufau-de Barberà M, Gomes-Azevedo S. Comparison of the marginal adaptation of zirconium dioxide crowns in preparations with two different finish lines. J Prosthodont 2012;21:291-295.

Beuer F, Aggstaller H, Edelhoff D, Gernet W. Effect of preparation design on the fracture resistance of zirconia crown copings. Dent Mater J 2008;27:362-367.

Gehrt M, Wolfart S, Rafai N, Reich S, Edelhoff D. Clinical results of lithium-disilicate crowns after up to 9 years of service. Clin Oral Investig 2013;17:275-284.

Seymour KG, Cherukara GP, Samarawickrama DY. Stresses within porcelain veneers and the composite lute using different preparation designs. J Prosthodont 2001;10:16-21.

Anusavice KJ, Hojjatie B, Dehoff PH. Influence of metal thickness on stress distribution in metal-ceramic crowns. J Dent Res 1986;65:1173-1178.

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