post natal growth and development
TRANSCRIPT
Dr NIDESH MDS PEDODONTICS
Dr NIDESH MDS PEDODONTICS
Post Natal Growth And Development
Dr NIDESH MDS PEDODONTICS
Contents:
Introduction
Factors affecting growth
Mechanism
Theories
Post natal growth
Dr NIDESH MDS PEDODONTICS
Growth:
Change in any morphological parameter which is measurable.(Moss)
Development:
Progress towards maturity(todd)
All the naturally occuring unidirectional changes in the life of an individual from its existence as a single cell to its eloboration as a multifunctional unit terminating in death.(Moyers)
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Theories Of Growth:
Genetic TheorySutural Theory Cartilagenous TheoryFunctional Matrix TheoryVan Limborgh’s TheoryEnlows Expanding ‘V’principalEnlow’s Couterpart PrincipalNeurotropic Process In Orofacial Growth
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Genetic Theory
Van Limborgh’s Theory
Intrinsic genetic factorsLocal,general epigenetic factorsLocal,general environmental factors
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Cartilaginous Theory(Scott)
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Functional matrix theory(Melvin Moss)
Relation between form and fuction
skeletal unit-microskeletal unit -macroskeletal unit(endocranial surface of calvarium)
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Dr NIDESH MDS PEDODONTICS
Enlows Expanding ‘V’principal
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Enlow’s Couterpart Principal
Neurotropic Process In Orofacial Growth
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Factors affectig physical growth:
GeneticNutritionSocio economis factorsFamily size and birth orderPsychological disturbances
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Concepts of growth:
Concept of normality
Rhythm of growth(Hooton)
Growth spurts
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a) Just before birthb) One year after birthc) mixed dentition growth spurt Boys: 8 to 11 years Girls: 7 to 9 yearsd) Adolescent growth spurt Boys: 14 to 16 years Girls: 11 to 13 years
Growth Spurts
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Differential Growth:
Scammon’s Curve Of Growth
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Dr NIDESH MDS PEDODONTICS
Methods Of Studying Growth:
Bimetric TestsVital Staining(Belchier)Radio IsotopesImplantsRadiographic TechniquesNatural Markers
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Vital staining:
Madder plants stain red-alizarin
Alizarin redAcid alizarin blueTrypton blueTetracyclineLead acetate
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Radioisotopes:
Technetium-33Calcium-45Potassium-32
Implants:(Bjork):
1.5mm in Length ,0.5mm in diameter-Tantalum metal
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Natural markers:
Nutrient canals
Lines of arrested growth
Prominent trabeculae
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Mechanisms of bone growth:
Bone deposition and resorption
Cortical drift
Displacement-primary displacement -Secondary displacement
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Dr NIDESH MDS PEDODONTICS
Dr NIDESH MDS PEDODONTICS
Osteogenesis:
Endochondral Bone Formation
Intra Membranous Bone Formation
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Post natal growth of cranial vault
Post natal growth of cranial base
Post natal growth of nasomaxillary complex
Post natal growth of mandible
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Post Natal Growth Of Cranial Vault
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Increases in size at sutures:
Coronal LamboidalInterparietalparietosphenoidaaalParietotemporal
Height of bone-
Activity of –OccipitalTemporalsphenoidal
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Percentage of growth:
Birth-63%6 months-76%1 year-82%2 years-87%3 years-89%5 years-91%10 years-95%15 years-98%
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Post Natal Growth Of Cranial Base
Cortical Drift And Remodeling
Elongation At Synchondroses
Sutural Growth
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Dr NIDESH MDS PEDODONTICS
Dr NIDESH MDS PEDODONTICS
Sutural Growth:
Spheno-frontalFronto-temporalSpheno-ethmoidalFronto-ethomoidalFronto-zygomatic
Timing of cranial base growth:
Birth-55to60%4-7years:94%8-13years-98%
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Post Natal Growth Of Nasomaxillary Complex
Displacement
Growth At Sutures
Surface Remodeling
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Bone Remodelling At Midfacial Region
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Bone Remodeling Of Palate
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Bone Remodeling Of Zygomatic Process
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Dr NIDESH MDS PEDODONTICS
Changes with compensations for passive motions by primary expansion of orofacial capsule
Changes in bone morphology-alterations in volume size shape or spatial position
Bone changes associated-form of bone itself
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Post natal growth of mandible:
RamusCorpus or the body of the mandileAngle of the mandibleThe lingual tuberosityThe alveolar processThe chinThe condyleThe coronoid process
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POST NATAL DEVELOPMENT OF MANDIBLE
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Growth of ramus
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Growth of corpus or body of the mandible
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Linear tuberosity: Deposition-posteriorly and medially
Resorption –below lingual fossa
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Chin :
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Coronoid process:
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Referrences:
Text book of orthodontics-Bishara.P,samir.E
Craniofacial embryogenetics and development-Sperber
Orthodontics current principles and techniques-graber
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