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. 2012 Sep;82(5):799-805.
doi: 10.2319/083111-560.1. Epub 2012 Feb 6.

Stress distribution pattern in a root of maxillary central incisor having various root morphologies: a finite element study

Ranjit H Kamble  1 , Sameer Lohkare, Pushpa V Hararey, Ram D Mundada
Affiliations

Stress distribution pattern in a root of maxillary central incisor having various root morphologies: a finite element study

Ranjit H Kamble et al. Angle Orthod. 2012 Sep.

Abstract

Objective: To investigate stress distribution in the roots of maxillary central incisors bearing various types of root morphologies with regard to application of different types of orthodontic forces using the finite element model (FEM).

Materials and methods: FEMs of maxillary central incisors with different root morphologies (normal, short, blunt, dilacerated, and pipette) were constructed, and orthodontic forces in various directions (intrusion, extrusion, tipping, and rotational) were applied to the tooth axis at the bracket level.

Result: On application of various forces, significantly increased stress was seen at the apex of the root with dilacerated morphology and at the cervical one-third region of the tooth with the short root. Increased stress was observed at the middle one-third region in the tooth with the pipette-shaped root during intrusion and extrusion.

Conclusions: In the present study, the stress distribution pattern indicates that the maxillary central incisors with deviated root morphology are at higher risk of root resorption.

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Figures

Figure 1
Figure 1
Various root morphologies. (A) Normal root morphology. (B) Short root morphology. (C) Blunt root morphology. (D) Dilacerated root morphology. (E) Pipette root morphology.
Figure 2
Figure 2
Area of force application.
Figure 3
Figure 3
Effect on application of intrusion force on various root morphologies. (A) Intrusion force on normal root. (B) Intrusion force on short root. (C) Intrusion force on blunt root. (D) Intrusion force on dilacerated root. (E) Intrusion force on pipette root.
Figure 4
Figure 4
Effect on application of extrusive force on various root morphologies. (A) Extrusion force on normal root. (B) Extrusion force on short root. (C) Extrusion force on blunt root. (D) Extrusion force on dilacerated root. (E) Extrusion force on pipette root.
Figure 5
Figure 5
Effect on application of tipping force on various root morphologies. (A) Tipping force on normal root. (B) Tipping force on short root. (C) Tipping force on blunt root. (D) Tipping force on dilacerated root. (E) Tipping force on pipette root.
Figure 6
Figure 6
Effect on application of rotational force on various root morphologies. (A) Rotational force on normal root. (B) Rotational force on short root. (C) Rotational force on blunt root. (D) Rotational force on dilacerated root. (E) Rotational force on pipette root.
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