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Table 3 Percentage 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 (100%)

Ref (100%)

Ref (100%)

Ref (100%)

 

Composite resin

+0%

+0.2%

−0.4%

+0%

Bracket

Titanium

Ref (100%)

Ref (100%)

Ref (100%)

Ref (100%)

 

Stainless steel

+10.8%

+2.8%

+3.1%

+29.4%

 

Ceramic

+18.8%

+4.2%

+30.3%

+59.3%

Ligature

Elastomeric

Ref (100%)

Ref (100%)

Ref (100%)

Ref (100%)

 

Stainless steel

+3.0%

+0.8%

−12.9%

+3.7%

Wire

TMA

Ref (100%)

Ref (100%)

Ref (100%)

Ref (100%)

 

Stainless steel

+150.0%

+84.2%

+126.5%

+117.9%

  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