J Adv Prosthodont.  2014 Dec;6(6):444-450. 10.4047/jap.2014.6.6.444.

Effect of anatomic, semi-anatomic and non-anatomic occlusal surface tooth preparations on the adaptation of zirconia copings

• Habib SR
• Asiri W
• Hefne MJ

• KMID: 2284716
• DOI: http://doi.org/10.4047/jap.2014.6.6.444

Abstract

PURPOSE
To compare the accuracy of marginal and internal adaptation of zirconia (Zr) copings fabricated on anatomic (A), semi-anatomic (SA) and non-anatomic (NA) occlusal surface preparations.
MATERIALS AND METHODS
45 extracted bicuspid teeth were prepared for receiving zirconia crowns, with different occlusal preparation designs A=15, SA=15 & NA=15. The Zr copings were fabricated by using CAD4DENT, CAD/CAM. The copings were adjusted, cemented and were cross sectioned centrally from buccal cusp tip to lingual cusp tip into mesial and distal halves. The copings were examined under electron microscope at x200 magnification and the measurements were recorded at 9 predetermined areas in micrometers.
RESULTS
Overall mean gap values for the three groups was found to be 155.93+/-33.98 microm with Anatomical Occlusal preparation design having the least gap value of 139.23+/-30.85 microm showing the best adaptation among the groups. Post Hoc Tukey's test showed a statistically significant difference (P=.007) between the means of gap for A & NA preparation designs. Measurements recorded at 9 predetermined points showed variations for the three groups.
CONCLUSION
Anatomical occlusal preparation designs resulted in better marginal and internal adaptation of Zr copings. There is a considerable variation between the measured marginal and internal gap values for the Zr copings fabricated by the (CAD4DENT-CAD/CAM). This variation may be associated with the lack of standardization of the preparation of teeth, computerized designing of the coping for each tooth, cement used, uniform pressure application during the cementation of the copings, sectioning of the copings and the microscopic measurements.

Keyword

Zirconia copings; Zirconia crowns; Marginal fit of zirconia crowns; Adaptation of zirconia crowns

MeSH Terms

Bicuspid
Cementation
Crowns
Tooth
Tooth Preparation*

Figure

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  Fig. 1 Sectioned copings mounted in acrylic resin.

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  Fig. 2 Sectioned copings coated with fine coat ion sputter JFC-1100.

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  Fig. 3 Cross sectional diagrammatic representation of the 9 measuring areas.

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  Fig. 4 Sample excluded from study.

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  Fig. 5 Comparison of the mean values of gaps for the three groups at 9 measured areas.

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