Fracture resistance of prepared teeth restored with bonded inlay restorations
Section snippets
Selection and preparation of teeth
Fifty recently extracted human premolar teeth were immersed in 0.5% chloramine solution for disinfection and stored for 1 week in distilled water before the experiment was begun. Any calculus and soft tissue deposits were removed from the selected teeth by use of a hand scaler (Gracey curette SG 17/18; Hu-Friedy, Chicago, Ill.). The teeth were mounted with their roots imbedded in autopolymerized acrylic blocks with the cementoenamel junction (CEJ) 2 mm above the surface of the acrylic resin
Results
The mean peak fracture load (N) for each group is reported in Table II. Analysis of the results revealed that prepared maxillary premolars with large MOD lose 59% of their strength when tested occlusally with a compressive load. Intact teeth were more resistant to fracture than prepared but unrestored teeth (P<.0001) and all restored groups (P<.0001). Restored teeth were not more resistant to fracture than prepared but unrestored teeth (P>.05), but the average strength for each group restored
Discussion
Preparing maxillary premolars with large and deep MOD preparations weakened the teeth by 59%. In a recent study, Cotert et al20 confirmed the weakening effect of preparation and that there is partial reinforcement when teeth are restored with acid etching, bonding agents, and different types of restorations. In this study, the restored teeth showed a slight increase in fracture resistance varying between 4% and 15% when compared with unrestored teeth, but bonded ceramic and composite inlays did
Conclusions
Within the limitations of this study, the results suggest that the use of large MOD preparations severely weakens maxillary premolars. Under compressive load testing, composite and ceramic bonded inlay restorations do not restore the original strength of the teeth. Clinical extrapolation of these experimental results must be made carefully, since at this time no experimental method truly imitates the conditions under which the teeth function in the oral environment.
References (36)
- et al.
Fracture strength of human teeth with cavity preparations
J Prosthet Dent
(1980) - et al.
Fracture strength of molars containing three surface amalgam restorations
J Prosthet Dent
(1982) - et al.
Internal enamel reinforcement through micromechanical bonding
J Prosthet Dent
(1976) - et al.
Resistance to cusp fracture in class II prepared and restored premolars
J Prosthet Dent
(1986) - et al.
Mechanical properties of a new mica-based machinable glass ceramic for CAD/CAM restorations
J Prosthet Dent
(1996) - et al.
Clinical performance of CEREC ceramic inlaysa systematic review
Dent Mater
(1999) - et al.
Fractures of posterior teeth in adults
J Am Dent Assoc
(1986) - et al.
Fracture resistance of posterior teeth restored with glass ionomer-composite resin systems
J Prosthet Dent
(1989) - et al.
Effect of bonded amalgam on the fracture resistance of teeth
J Prosthet Dent
(1992) - et al.
Fracture resistance of teeth with resin-bonded restorations
J Prosthet Dent
(1986)
Clinically relevant approach to failure testing of all-ceramic restorations
J Prosthet Dent
Posterior resin-based composite restorationsclinical recommendations for optimal success
J Esthet Restor Dent
Biomechanics of the intact, prepared and restored toothsome clinical implications
Int Dent J
Cavity preparation
Irish Dent Rev
Effect of designs of class 2 preparations on resistance of teeth to fracture
Oper Dent
Effect of prepared cavities on the strength of teeth
Oper Dent
Multifactorial analysis of an MOD restored human premolar using auto-mesh finite element approach
J Oral Rehabil
Parameters of MOD cavity preparationsa 3-D FEM study, Part II
Oper Dent
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