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. 2022 Dec 1;22(1):550.
doi: 10.1186/s12903-022-02596-2.

Stress distribution in pediatric zirconia crowns depending on different tooth preparation and cement type: a finite element analysis

Sang-Yeop Chung #  1 , Hyeonjong Lee #  2 , Yong Kwon Chae  3   4 , Yun Sun Jung  3   4 , Su-Sung Jo  1 , Ko Eun Lee  3   4 , Sung Chul Choi  3   4 , Ok Hyung Nam  5   6
Affiliations

Stress distribution in pediatric zirconia crowns depending on different tooth preparation and cement type: a finite element analysis

Sang-Yeop Chung et al. BMC Oral Health. .

Abstract

Background: In clinical settings, tooth preparation for prefabricated zirconia crowns (PZCs) in the primary dentition varies widely. However, knowledge about the biomechanical behavior of PZCs in various clinical settings is limited. This study was conducted to evaluate the biomechanical behavior of PZCs in different clinical settings using 3-dimensional finite element analysis.

Methods: 3-dimensional models of the PZC, cement, and tooth with six different conditions were simulated in primary molar teeth, incorporating cement thickness (100, 500, and 1000 μm) and cement type (resin-modified glass ionomer cement and resin cement). A total of 200 N of occlusal force was applied to the models, both vertically and obliquely as representative cases. A general linear model univariate analysis with partial eta-squared (ηp2) was performed to evaluate the relative effects of the variables.

Results: The overall stress of tooth was increased as the cement space increases under oblique loading. The von Mises stress values of the resin cements were significantly higher than those of the resin-modified glass ionomer cements for all cement thicknesses (p < .05). The effect size of the cement type (ηp2 = .519) was more dominant than the cement thickness (ηp2 = .132) in the cement layer.

Conclusions: Within the limits of this study, cement type has a greater influence on the biomechanical behavior of PZCs than cement thickness.

Keywords: Finite element analysis; Prefabricated zirconia crown; Primary teeth; Tooth preparation.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Fig. 1
Fig. 1
Establishment of finite element mesh model and loading conditions. a Geometric models of prefabricated zirconia crown, cement, and tooth part, and their combined finite element (FE) mesh model (cement 500 case). Note that blue, gray, and red parts in the FE mesh are crown, cement, and tooth, respectively. b Loading conditions for simulating mastication of children. For both vertical and angular forces, three points on the fossa and two points on the cusps were considered, and 40 N of force was applied to each node (200 N in total)
Fig. 2
Fig. 2
Stress distribution (MPa) at crown level for each model. Stress level was presented as color-coded map. Red color represents to high stress concentration and blue color represents less stress concentration
Fig. 3
Fig. 3
Stress distribution (MPa) at cement level for each model. Stress level was presented as color-coded map. Red color represents to high stress concentration and blue color represents less stress concentration
Fig. 4
Fig. 4
Stress distribution (MPa) at tooth level for each model. Stress level was presented as color-coded map. Red color represents high stress concentration and blue color represents less stress concentration
Fig. 5
Fig. 5
von Mises stress values (MPa) in each model according to loading conditions. a Crown layer, b cement layer, c tooth layer. Within vertical and oblique forces, different case letters represent statistically significant (p < .05)
Fig. 6
Fig. 6
Strain distribution of whole layers in each model. Strain level was presented as color-coded map. Red color represents high stress concentration and blue color represents less stress concentration
See this image and copyright information in PMC

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