Three-dimensional finite-element analysis of two ceramic inlay restorations with different cavity designs

Figures & data

Figure 1. Tooth, inlay cavity and filling material model.

Table 1. Materials used to model restoration of molars with porcelain and zirconia ceramic inlays.

Material	Elasticity module (GPa)	Poisson ratio
Enamel	72.7	0.33
Dentin	18.0	0.31
Zirconia ceramic (ICE Zirkon Zirkonzahn SRL, Gais, Italy)	210	0.33
Porcelain ceramic (Empress II, Ivoclar Vivadent Liechtenstein)	103	0.24
Adhesive agent (Optibond FL, Kerr, USA)	1.0	0.3
Luting cement (Variolink II, Ivoclar Vivadent, Liechtenstein)	8.3	0.24

Figure 2. Cavities with rectangular and rounded corners.

Figure 3. Vertical loading force of 250 N. Mesial loading of 250/3 N (A). Central loading of 250/3 N (B). Distal loading of 250/3 N (C).

Figure 4. Stress analysis values for the zirconia ceramic group.

Figure 5. Stress analysis values for the porcelain ceramic group.

Table 2. Maximum and minimum stress values after force application (MPa).

		Cavity with rectangular corner		Cavity with rounded corner
Material	Force application area	(Max.)	(Min.)	(Max.)	(Min.)
Zirconia ceramic	Enamel	10.13	0.74	9.99	0.75
	Dentin	1.88	0.26	3.57	0.26
	Inlay material	9.52	1.47	5.01	1.38
Porcelain ceramic	Enamel	14.50	0.87	14.52	0.87
	Dentin	2.16	0.32	2.14	0.31
	Inlay material	9.81	1.04	4.36	1.08