Related Experiment Video
Updated: Jul 14, 2026
07:16
Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
Analysis of sutural strain in maxillary protraction therapy
Christof Holberg1, Luai Mahaini, Ingrid Rudzki
1Department of Orthodontics, University of Munich, Munich, Germany. christof.holberg@kfo.med.uni-muenchen.de
The Angle Orthodontist
|July 4, 2007
Summary
Maxillary protraction therapy shows minimal strain on sutures, suggesting limited skeletal effects. The therapy
Area of Science:
- Orthodontics and craniofacial research.
- Biomechanical analysis of orthodontic forces.
Background:
- Maxillary protraction therapy is used to advance the midface.
- Understanding the biomechanical response of craniofacial sutures to orthodontic forces is crucial.
Purpose of the Study:
- To quantify strain in midface and cranial base sutures during maxillary protraction therapy.
- To determine if observed strains indicate a significant skeletal response.
Main Methods:
- A finite element model simulating maxillary protraction was developed.
- Simulations included varying force levels (2x3N, 2x5N) and vectors (anterior, anterior-caudal).
- Strain measurements (microstrain) were recorded at midface and cranial base sutures.
Main Results:
- Average measured strains were below 10 microstrain.
- Higher strains (up to 26.4 microstrain) occurred at the nasal bone and cranial base with anterior forces.
- Anterior-caudal forces generally resulted in lower measured strains.
Conclusions:
- Measured strains are significantly lower than known thresholds for bone growth stimulation (Frost thresholds).
- The strains generated by maxillary protraction therapy are unlikely to stimulate substantial bone growth.
- The clinical effectiveness of maxillary protraction therapy likely stems primarily from dental effects rather than skeletal changes.
Related Concept Videos
01:29Three-Dimensional Analysis of Strain
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
01:22Sutures of the Skull
The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
01:20Normal Strain under Axial Loading
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...