retrusion 

  1. 名詞
牙齒的後移狀態

    
                        
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例句

                

                    
    
                                                    
  1. 
                                The reversal of protrusion is retrusion .                            
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  2. 
                                The " retrusion " or hypoplasia of the midface is what could be described as a concave or dished in profile.                            
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                                As the skull grows, the upper and lower thirds of the face tend to grow at normal rates, but the middle third of the face grows slower, resulting in a more pronounced retrusion over time.                            
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