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. 2017 Dec;18(1):2.
doi: 10.1186/s40510-016-0155-8. Epub 2017 Jan 9.

Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices-a FEM study

Monica Namburi  1 , Sleevaraju Nagothu  2 , Chetan S Kumar  2 , N Chakrapani  2 , C H Hanumantharao  2 , Supradeep K Kumar  2
Affiliations

Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices-a FEM study

Monica Namburi et al. Prog Orthod. 2017 Dec.

Abstract

Background: Extraction of premolars and retracting the anterior teeth using mini-implants and anterior retraction hooks became advent now a day. In such treatments, consolidation of arches is not done in regular practice. So, the present study is concentrated on effects of consolidation in two implant and three implant combinations of retraction and intrusion.

Methods: A three-dimensional FEM model of maxillary teeth and periodontal ligament housed in the alveolar bone with the first premolars extracted is generated with appropriate number of elements and nodes. The models were broadly divided into two groups according to the no. of implants. Mini-implants were placed bilaterally between the second premolar and molar at varying heights (7, 10, 13 mm) in group I, and along with bilateral implants, an additional mid-implant is placed between the central incisors as group II. Brackets with 0.022 slot were placed on the teeth, 19 × 25 SS wire is placed in the brackets, an anterior retraction hook was placed at 9 mm height, and analysis was done to evaluate the stresses and displacement patterns in consolidation and non-consolidation models.

Results: The results showed that consolidation of the anterior teeth during intrusion and retraction shows various advantages such as less stresses on the bone, PDL, implant, teeth, and no labial flaring of the anterior teeth and three implant system, i.e., two bilateral implant at 10 mm and a mid-implant at 12 mm between the centrals has shown to be better than other models as bodily movement is observed.

Conclusion: Consolidation is better than non consolidation during enmasse retraction and intrusion.

Keywords: Bilateral implants; Consolidation; FEM; Initial displacements; Intrusion; Mini-screws; PDL; Retraction; Stress distribution; Three implants.

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Figures

Fig. 1
Fig. 1
Bilateral implant model
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Fig. 2
Three implant model
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Fig. 3
Implant heights
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Anterio-posterior displacement pattern
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Fig. 5
Vertical displacement patterns
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Fig 6
Stress distribution patterns in PDL
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Fig. 7
Stress distribution patterns in the hard bone and soft bone
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Fig. 8
Stress distribution patterns on the teeth
See this image and copyright information in PMC

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