Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Acknowledgments
- Part one Theoretical considerations
- Part two Applications of Fourier descriptors
- 6 Closed-form Fourier analysis: A procedure for extraction of ecological information about foraminiferal test morphology
- 7 Fourier descriptors and shape differences: Studies on the upper vertebral column of the mouse
- 8 Application of the Fourier method on genetic studies of dentofacial morphology
- 9 Fourier analysis of size and shape changes in the Japanese skull
- 10 Craniofacial variability in the hominoidea
- 11 Heuristic adequacy of Fourier descriptors: Methodologic aspects and applications in Morphological
- 12 Analyzing human gait with Fourier descriptors
- 13 Elliptic Fourier descriptors of cell and nuclear shapes
- 14 Cranial base changes in shunt-treated hydrocephalics: Fourier descriptors
- 15 A numerical and visual approach for measuring the effects of functional appliance therapy: Fourier descriptors
- 16 Size and shape of the rabbit orbit: 3-D Fourier descriptors
- 17 From optical to computational Fourier transforms: The natural history of an investigation of the cancellous structure of bone
- 18 Epilogue: Fourier methods and shape analysis
- Appendix
- Glossary
- Index
15 - A numerical and visual approach for measuring the effects of functional appliance therapy: Fourier descriptors
Published online by Cambridge University Press: 14 September 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- Acknowledgments
- Part one Theoretical considerations
- Part two Applications of Fourier descriptors
- 6 Closed-form Fourier analysis: A procedure for extraction of ecological information about foraminiferal test morphology
- 7 Fourier descriptors and shape differences: Studies on the upper vertebral column of the mouse
- 8 Application of the Fourier method on genetic studies of dentofacial morphology
- 9 Fourier analysis of size and shape changes in the Japanese skull
- 10 Craniofacial variability in the hominoidea
- 11 Heuristic adequacy of Fourier descriptors: Methodologic aspects and applications in Morphological
- 12 Analyzing human gait with Fourier descriptors
- 13 Elliptic Fourier descriptors of cell and nuclear shapes
- 14 Cranial base changes in shunt-treated hydrocephalics: Fourier descriptors
- 15 A numerical and visual approach for measuring the effects of functional appliance therapy: Fourier descriptors
- 16 Size and shape of the rabbit orbit: 3-D Fourier descriptors
- 17 From optical to computational Fourier transforms: The natural history of an investigation of the cancellous structure of bone
- 18 Epilogue: Fourier methods and shape analysis
- Appendix
- Glossary
- Index
Summary
Introduction
Functional appliances (FAs) are orthodontic/orthopedic appliances designed to treat patients with dental malocclusions and skeletal imbalances (e.g., retrognathia and prognathia). Despite the relatively long history of FA treatment, there continues to be controversy as to their mode of action, due in part to conflicting findings between investigators.
These appliances have been more commonly used in Europe than in the United States. American orthodontists were more likely to treat with fixed appliances or braces, whereas Europeans have been more interested in altering masticatory function to correct malocclusions, usually with the use of removable appliances. There are numerous designs all generally known as “functional appliances.” Some of these include specialized features for dental arch expansion, altering the facial vertical dimension, myofunctional therapy, and so on. The theoretical basis of FA treatment is in general the principle that a “new pattern of function,” dictated by the appliance, leads to the development of a “new morphological pattern” (Ricci, 1983). This new functional pattern is, presumably, generated by the sagittal and vertical alteration of the mandibular position in young patients (usually in early mixed dentition stages), resulting in orthodontic (primarily affecting dental units) and orthopedic (structural alterations affecting bone) adaptations to a new jaw position (Figure 15.1).
- Type
- Chapter
- Information
- Fourier Descriptors and their Applications in Biology , pp. 340 - 358Publisher: Cambridge University PressPrint publication year: 1997