Crowding
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牙列拥挤 Crowding PowerPoint PPT Presentation


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牙列拥挤 Crowding. 龚昕 上海第二医科大学 口腔医学院 口腔正畸科. 牙 列 拥 挤. 病因 (etiology) 诊断 (diagnosis) 治疗 (treatment). 病因 : 牙量、骨量不调 ( tooth size and arch length disproportion ). 种族演化 遗传 环境因素 ( 替牙障碍 ; 不良习惯等 ). 诊断: 拥挤度的确定 牙弓 应有弧形长度 与牙弓 现有弧形长度 之差. 轻度 ( I ) 中度 ( II ) 重度 ( III )

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牙列拥挤 Crowding

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Crowding


  • (etiology)

  • (diagnosis)

  • (treatment)


( tooth size and arch length disproportion

  • ( ; )


( I ) ( II ) ( III )

2 -- 4 mm 4 --8 mm > 8 mm


14161.5mm


  • 1mm1mm

  • 1mm2mm

  • Speec 1mmSpeec1mm


1/4

1/4~1/2

1/2


SN-MP>40

FH-MP>32

SN-MP<29

FH-MP<22






    • 1~2



serial extraction )


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------

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  • 2~3mm

  • 300~500g.

  • 12-14


(acrylic cervical ocipital appliance, ACCO)

Pendulum)


  • III



Lip bumper)




    • III

    • 8~14


    • 2~4/1/40.5~1.0mm/2~33

    • 41/41mm/2~3

    • 1


    • 10mm50%50%

    • 4mm




    • 1mm2mm


    • X



    • III

    • BoltonIII



    • 0.25mm

    • 5~6mm




  • 0.2~0.3mm

  • 6~12



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