J Korean Acad Prosthodont.  2014 Jul;52(3):202-210. 10.4047/jkap.2014.52.3.202.

Effect of the marginal position of prosthesis on stress distribution of teeth with abfraction lesion using finite element analysis

• Kim MH
• Lee CH

• KMID: 2195428
• DOI: http://doi.org/10.4047/jkap.2014.52.3.202

Abstract

PURPOSE
The aim of this study was to evaluate the stress concentration and distribution whether restoring the cavity or not while restoring with metal ceramic crown on tooth with abfraction lesion using finite element analysis.
MATERIALS AND METHODS
Maxillary first premolar was selected and made a total of 10 finite element model. Model 1 was natural tooth; Model 2 was tooth with metal ceramic crown restoration which margin was positioned above 2 mm from CEJ; Model 3 was tooth with metal ceramic crown restoration which margin was positioned on CEJ; Model 4 was natural tooth which has abfraction lesion; Model 5 and 6 had abfraction lesion and the other condition was same as model 2 and 3, respectively; Model 7 was natural tooth which had abfraction lesion restored with composite resin; Model 8 and 9 was tooth with metal ceramic crown after restoring on abfraction lesion with composite resin; Model 10 was restored tooth on abfraction lesion with composite resin and metal ceramic crown restoration which margin is positioned on lower border of abfraction lesion. Load A and Load B was also designed. Von Mises value was evaluated on each point.
RESULTS
Under load A or load B, on tooth with abfraction lesion, stress was concentrated on the apex of lesion. Under load A or load B, on tooth that abfraction lesion was restored with composite resin, the stress value was reduced on the apex.
CONCLUSION
In case of abfraction lesion was restored with composite resin, the stress was concentrated on the apical border of restored cavity regardless of marginal position. It was favorable to place crown margin on the enamel for restoring with metal ceramic crown.

Keyword

Dental stress analysis; Finite element analysis

MeSH Terms

Bicuspid
Ceramics
Crowns
Dental Enamel
Dental Stress Analysis
Finite Element Analysis*
Prostheses and Implants*
Tooth Cervix
Tooth*
Ceramics

Figure

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  Fig. 1. Finite element model used in this study.

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  Fig. 2. Analysis models were designed according to the experimental conditions (Parts shown with the yellow represent composite resin restorations).

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  Fig. 3. Reference points for comparison of stress value and the direction and application point of Load A and B (A: buccalcemento-enamel junction, B: palatal cemen-to-enamel junction, C: the apex of abfraction lesion, D: the apical border of abfraction lesion, E: the buccal margin of metal ceramic crown which is positioned 2 mm above from buccal CEJ, The red arrow means Load A & the blue arrow means Load B).

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  Fig. 4. Stress distribution pattern under Load A.

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  Fig. 5. Stress distribution pattern under Load B.

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