J Adv Prosthodont.  2019 Dec;11(6):324-330. 10.4047/jap.2019.11.6.324.

Influence of preparation design on fracture resistance of different monolithic zirconia crowns: A comparative study

Affiliations
  • 1Department of Conservative Dentistry, College of Dentistry, Mustansiriyah University, Baghdad, Iraq. meelad_06@yahoo.com

Abstract

PURPOSE
The aim of the study was to evaluate and compare the fracture resistance and modes of fracture of monolithic zirconia crowns with two preparation designs.
MATERIALS AND METHODS
Forty human maxillary first premolar teeth were extracted for orthodontic purposes and divided into two main groups (n=20): Group A: monolithic traditional zirconia; Group B: monolithic translucent zirconia. The groups were further subdivided into two subgroups (n=10): (A1, B1) shoulder margin design; (A2, B2) feather-edge margin design. Teeth were prepared with either a 1 mm shoulder margin design or a feather-edge margin design. The prepared teeth were scanned using a digital intraoral scanner. The crowns were cemented using self-adhesive resin cement. All cemented teeth were stored in water for 7 days and thermocycling was done before testing. All samples were subjected to compressive axial loading until fracture. The fractographic analysis was done to assess the modes of fracture of the tested samples.
RESULTS
The highest mean values of fracture resistance were recorded in kilo-newton and were in the order of subgroup A1 (2.903); subgroup A2 (2.3); subgroup B1 (1.854) and subgroup B2 (1.523). One-way ANOVA showed a statistically significant difference among the 4 subgroups. Concerning modes of fracture, the majority of samples in subgroups A1 and B1 were fracture of restoration and/or tooth, while in subgroups A2 and B2, the majority of samples fractured through the central fossa.
CONCLUSION
Even though all the tested crowns fractured at a higher level than the maximum occlusal forces, the shoulder margin design was better than the feather-edge margin design and the monolithic traditional zirconia was better than the monolithic translucent zirconia in terms of fracture strength.

Keyword

Monolithic zirconia; Translucent; Ceramic; Feather-edge; Shoulder

MeSH Terms

Bicuspid
Bite Force
Ceramics
Crowns*
Humans
Resin Cements
Shoulder
Tooth
Water
Resin Cements
Water

Figure

  • Fig. 1 Samples of prepared teeth. (A) Shoulder margin design, (B) Feather-edge margin design.

  • Fig. 2 Irreparable fracture of the monolithic zirconia crown and the tooth under a digital stereomicroscope (40×) for the shoulder margin design (Code V).

  • Fig. 3 Fracture of monolithic zirconia crown under a digital stereomicroscope (40×) for feather-edge margin design (Code III).

  • Fig. 4 Fractographic analysis. SEM for the shoulder subgroups revealed the crack origin (star) and the crack propagation direction (CPD) (arrow) which was started from the occlusal surface of the crown toward the shoulder margin. (A) Non-approximated view (19×), (B) Closer view (94×).

  • Fig. 5 Fractographic analysis. SEM for the feather-edge subgroups revealed the crack origin (star) and the crack propagation direction (CPD) (arrow) which was started from the occlusal surface of the crown toward the tooth. (A) Non-approximated view (25×), (B) Closer view (99×).


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