Download - 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)
Dr NIDESH MDS PEDODONTICS
Theories Of Growth:
Genetic TheorySutural Theory Cartilagenous TheoryFunctional Matrix TheoryVan Limborgh’s TheoryEnlows Expanding ‘V’principalEnlow’s Couterpart PrincipalNeurotropic Process In Orofacial Growth
Dr NIDESH MDS PEDODONTICS
Genetic Theory
Van Limborgh’s Theory
Intrinsic genetic factorsLocal,general epigenetic factorsLocal,general environmental factors
Dr NIDESH MDS PEDODONTICS
Functional matrix theory(Melvin Moss)
Relation between form and fuction
skeletal unit-microskeletal unit -macroskeletal unit(endocranial surface of calvarium)
Dr NIDESH MDS PEDODONTICS
Factors affectig physical growth:
GeneticNutritionSocio economis factorsFamily size and birth orderPsychological disturbances
Dr NIDESH MDS PEDODONTICS
Concepts of growth:
Concept of normality
Rhythm of growth(Hooton)
Growth spurts
Dr NIDESH MDS PEDODONTICS
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
Dr NIDESH MDS PEDODONTICS
Methods Of Studying Growth:
Bimetric TestsVital Staining(Belchier)Radio IsotopesImplantsRadiographic TechniquesNatural Markers
Dr NIDESH MDS PEDODONTICS
Vital staining:
Madder plants stain red-alizarin
Alizarin redAcid alizarin blueTrypton blueTetracyclineLead acetate
Dr NIDESH MDS PEDODONTICS
Radioisotopes:
Technetium-33Calcium-45Potassium-32
Implants:(Bjork):
1.5mm in Length ,0.5mm in diameter-Tantalum metal
Dr NIDESH MDS PEDODONTICS
Natural markers:
Nutrient canals
Lines of arrested growth
Prominent trabeculae
Dr NIDESH MDS PEDODONTICS
Mechanisms of bone growth:
Bone deposition and resorption
Cortical drift
Displacement-primary displacement -Secondary displacement
Dr NIDESH MDS PEDODONTICS
Post natal growth of cranial vault
Post natal growth of cranial base
Post natal growth of nasomaxillary complex
Post natal growth of mandible
Dr NIDESH MDS PEDODONTICS
Increases in size at sutures:
Coronal LamboidalInterparietalparietosphenoidaaalParietotemporal
Height of bone-
Activity of –OccipitalTemporalsphenoidal
Dr NIDESH MDS PEDODONTICS
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%
Dr NIDESH MDS PEDODONTICS
Post Natal Growth Of Cranial Base
Cortical Drift And Remodeling
Elongation At Synchondroses
Sutural Growth
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%
Dr NIDESH MDS PEDODONTICS
Post Natal Growth Of Nasomaxillary Complex
Displacement
Growth At Sutures
Surface Remodeling
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
Dr NIDESH MDS PEDODONTICS
Post natal growth of mandible:
RamusCorpus or the body of the mandileAngle of the mandibleThe lingual tuberosityThe alveolar processThe chinThe condyleThe coronoid process
Dr NIDESH MDS PEDODONTICS
Linear tuberosity: Deposition-posteriorly and medially
Resorption –below lingual fossa
Dr NIDESH MDS PEDODONTICS
Referrences:
Text book of orthodontics-Bishara.P,samir.E
Craniofacial embryogenetics and development-Sperber
Orthodontics current principles and techniques-graber