Indirect miniscrew anchorage: biomechanical loading of the dental anchorage during mandibular molar protraction-an FEM analysis.
J Orofac Orthop
; 75(1): 16-24, 2014 Jan.
Article
em En
| MEDLINE
| ID: mdl-24448924
ABSTRACT
AIMS:
While there are many studies in the literature addressing direct miniscrew anchorage, the biomechanical effects of indirect miniscrew anchorage remain unknown. The aim of the present study was to biomechanically analyze the load on the anchor teeth during mandibular molar protraction using different types of anchorage. MATERIALS ANDMETHODS:
Four finite element method (FEM) models of the right mandible were created using the morphological CT data of a 21-year-old male. All models were morphologically identical, but they differed in anchorage type (dental anchorage, direct miniscrew anchorage, indirect miniscrew anchorage with one anchor tooth, indirect miniscrew anchorage with two anchor teeth). To analyze the load on the dental anchorage during mandibular molar protraction, we measured the induced effective strain (µstrain) at specific control points on the alveolar bone.RESULTS:
With indirect miniscrew anchorage, we observed that the effective strain at an average of 7.21 µstrain (one anchor tooth) or 6.57 µstrain (two anchor teeth) was almost as high as in pure dental anchorage where no miniscrew was used (mean 8.38 µstrain). In contrast, we noted significantly lower strain values in conjunction with direct miniscrew anchorage. We observed highly significant differences between direct and indirect simulated miniscrew anchorage (p=0.008).CONCLUSION:
Our FEM results reveal relatively high loads on the dental anchorage when using indirect miniscrew anchorage. This may carry an increased risk of anchorage loss during mandibular molar protraction; however, further studies are necessary to confirm this.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Técnicas de Movimentação Dentária
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Parafusos Ósseos
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Análise do Estresse Dentário
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Procedimentos de Ancoragem Ortodôntica
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Mandíbula
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Modelos Biológicos
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Dente Molar
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
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Humans
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Male
Idioma:
En
Revista:
J Orofac Orthop
Ano de publicação:
2014
Tipo de documento:
Article