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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

694
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
694

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Morphologic predictors of mandibular changes induced by Sander's Bite Jumping Appliance.

Vincenzo D'Antò1, Giorgio Oliva1, Roberto Rongo1

  • 1Department of Neuroscience, Reproductive Sciences and Oral Sciences, Section of Orthodontics, University of Naples Federico II, Naples, Italy.

Orthodontics & Craniofacial Research
|August 24, 2024
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Summary

Pretreatment Condilion-Gonion-Menton (Co-Go-Me) and Incisor-Mandibular Plane Angle (IMPA) angles predict mandibular length increase in Class II patients treated with the Bite Jumping Appliance (BJA). These cephalometric variables aid in anticipating treatment outcomes.

Keywords:
Class II therapySander's Bite Jumping Appliancemandibular changesprediction model

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Area of Science:

  • Orthodontics
  • Cephalometric analysis
  • Craniofacial growth

Background:

  • Class II malocclusion with mandibular retrusion requires effective treatment strategies.
  • The Bite Jumping Appliance (BJA) is used to correct such discrepancies.
  • Predicting treatment response is crucial for personalized orthodontic care.

Purpose of the Study:

  • To identify pretreatment cephalometric variables predicting mandibular length increase in Class II patients with mandibular retrusion.
  • To evaluate the efficacy of the Bite Jumping Appliance (BJA) in enhancing mandibular growth.
  • To establish correlations between specific craniofacial morphologic features and treatment outcomes.

Main Methods:

  • Retrospective analysis of 43 Class II patients treated with BJA.
  • Measurement of mandibular structural features (symphysis, ramus, angles) from lateral cephalograms at T0 and T1 (15 months).
  • Regression analysis to associate pretreatment variables with mandibular length changes.

Main Results:

  • Significant mandibular length increase (7.1 ± 3.4 mm) observed post-treatment (p < .001).
  • Pretreatment Condilion-Gonion-Menton (Co-Go-Me) angle showed a significant negative association with mandibular length change (p < .05).
  • Incisor-Mandibular Plane Angle (IMPA) was also negatively associated with mandibular length change.

Conclusions:

  • The Co-Go-Me angle and IMPA angle are reliable predictors of mandibular response to BJA treatment.
  • These cephalometric variables can guide treatment planning for Class II patients.
  • Understanding pretreatment morphology enhances the predictability of orthodontic interventions.