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 How is growth velocity affected by variations in maturational level?

                   

                   The maturational level ( advanced vs. average vs. delayed ) is
                    especially important to consider in order to understand the
                    the variations in the timing and amounts of future growth that 
                    different children exhibit.  The timing and nature of clinical 
                    treatment depends on these factors.
                    
                    Growing individuals who demonstrate the same stage ( SMI ) of 
                    maturation can exhibit significantly different amounts of facial
                    growth.  The following conceptual charts illustrate this.
            
                    During the rapidly accelerating ( SMI 1-3 ) and very high velocity 
                    ( SMI 4-7 ) periods of adolescent growth, advanced maturers 
                    exhibit significantly more maxillary and mandibular growth than
                    average and particularly delayed maturers.

                   

                  
                   
                    During the later period of adolescence when maxillary growth
                    velocity and the amounts of maxillary growth are significantly
                    decreasing, delayed maturers exhibit more incremental growth
                    than average and particularly advanced maturers.  The maxilla
                    completes a greater percentage of full growth at an earlier 
                    stage of development than the mandible.

                      

                 During the later portion of adolescence when mandibular growth
                    velocity is rapidly decelerating, delayed maturers exhibit a very
                    significant amount of additional incremental growth as compared
                    to average and particularly advanced maturers.  Delayed maturers
                    demonstrate 'catch-up' growth and take a longer time to accomplish
                    it.  This has very significant implications relative to treatment
                    timing.  The termination of growth is at a later chronologic age.
                    The mandible grows a lot more incrementally during late
                    adolescence compared to the maxilla.

                   
    

                All of the above factors vary relative to the 23 stages and 
                   14 levels of maturation. The GrowthTek Patient Report                 
                   evaluates the specific developmental factors regarding your 

                patient's unique maturational profile.

            Note: refer to the 'Clinical Applications' section of this web site
                            for pertinent information regarding rational timing of treatment
                            relative to growth velocity.

    selected reference: Silveira AM, Fishman LS, Subtelny JD, Kassebauum DK.
                                       Facial growth during adolescence in early, average,
                          
          and late maturers.  Angle Orthod 1992:62:185-189.

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