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Table 2 Absolute changes in the various models according to the material of each component

From: Torque differences due to the material variation of the orthodontic appliance: a finite element study

Factor

Group

Absolute crown displacement (mm)

Absolute apex displacement (mm)

Equivalent elastic strain in PDL

Von Mises stress in bracket (MPa)

Adhesive

RMGI

Ref (0.0102)

Ref (0.0513)

Ref (0.2405)

Ref (397.1245)

 

Composite resin

+0.0000

+0.0001

−0.0010

+0.0555

Bracket

Titanium

Ref (0.0093)

Ref (0.0501)

Ref (0.2159)

Ref (305.7099)

 

Stainless steel

+0.0010

+0.0014

+0.0068

+90.0031

 

Ceramic

+0.0018

+0.0021

+0.0655

+181.3240

Ligature

Elastomeric

Ref (0.0100)

Ref (0.0511)

Ref (0.2565)

Ref (389.9210)

 

Stainless steel

+0.0003

+0.0004

−0.0331

+14.4625

Wire

TMA

Ref (0.0058)

Ref (0.0361)

Ref (0.1470)

Ref (249.8552)

 

Stainless steel

+0.0087

+0.0304

+0.1859

+294.5942

  1. PDL periodontal ligament, TMA titanium molybdenum alloy, RMGI resin-modified glass ionomer cement, Ref reference category consisting of the average across models with this material