Microimplant stability

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with permission AJODO: Hee-Jin, Kim et al, S. Korea: V 130, n 2., Aug 2006 Soft tissue and cortical-bon thickness at orthodontic implant sites)

See explanation below

  Sample: the Maxillary sections from 23 cadavers: 16 men and 7 woman age Mean age 439.5 years

Regarding the top picture

Below you can read the thickness on the buccal side of the soft tissue at points A,B,C,D, and E (SOFT) (each point is 2 mm more superior than the one below it and points A,B,C,D,E (CORTICAL)

Measurements were made at the interdental  area:

Group1: Between the first and second premolars
    A1   1.39 SOFT
    B2   1.09 SOFT
    C3   0.86 SOFT
    D4   1.09 SOFT
    E5   1.38 SOFT

    A1 1.55 CORT
    B2 1.18 CORT
    C3 1.09 CORT
    D4 1.07 CORT
    E5 1.16 CORT

Group 2: Between the second premolar and the first molar:
    A1 1.43 SOFT
    B2 1.07 SOFT
    C3 0.34 SOFT
    D4 0.60 SOFT
    E5 0.74 SOFT

    A1 0.40 CORT
    B2 0.39 CORT
    C3 0.46 CORT
    D4 0.41 CORT
    E5 0.40 CORT  

 

Group: Between the first and second molars.
    A1 1.58 SOFT
    B2 0.78 SOFT
    C3 0.77 SOFT
    D4 0.82 SOFT
    E5 1.07 SOFT

    A1 0.85 CORT
    B2 0.94 CORT
    C3 0.85 CORT
    D4 0.82 CORT
    E5 0.87 CORT

Regarding the bottom picture  (mid-sagittal view of the palate where the first point is the Incisive papilla)

Below you can read the  buccal thickness of the soft tissue A',B',C',D', and E' SOFT (each point is 2 mm more distal than the one before it below it and points A'B'C'D'E'  CORTICAL  thickeness representing corresponding points on the palatal side of the maxillary alveolus.

Measurements were made at the interdental  area:

Group1: Between the first and second premolars:

    A'6   2.56 SOFT
    B'7   2.72 SOFT
    C'8   3.01 SOFT
    D'9   3.28 SOFT
    E'10   3.06 SOFT

    A'6 1.73 CORT
    B'7 1.76 CORT
    C'8 1.85 CORT
    D'9 1.73 CORT
    E'10 1.68 CORT

Group 2: Between the second premolar and the first molar
    A'6   2.81 SOFT
    B'7   2.59 SOFT
    C'8   2.88 SOFT
    D'9   3.07 SOFT
    E'10   2.74 SOFT

    A'6 1.81 CORT
    B'7 1.72 CORT
    C'8 1.73 CORT
    D'9 1.70 CORT
    E'10 1.54 CORT

Group: Between the first and second molars

    A'6   2.67 SOFT
    B'7   2.44 SOFT
    C'8   3.57 SOFT
    D'9   4.30 SOFT
    E'10   5.40 SOFT

    A'6 1.27 CORT
    B'7 1.66 CORT
    C'8 1.91 CORT
    D'9 1.79 CORT
    E'10 1.56 CORT

Regarding the bottom picture  (mid-sagittal view of the palate where the first point is the Incisive papilla)

Below you can read the thickness of the soft tissue (each point is 4 mm farther backthan the one before it below it at points at 7,8,9,10,11 and 12).

7. 1.95 (Incisive Papilla)

8. 2.93

9. 1.01

10 0.97

11 0.97

12 0.90

CONCLUSIONS:

Buccal soft  tissue was thickest closest to and farthest from the CEJ. and thinnest in the middle in al groups.

Palatal soft tissue thickness increased gradually from the CEJ toward the apical region.

Buccal cortical bone was thickest closest to and farthest from from the CEJ and thinnest in the middle in groups 1 and group2; in group 3 the thickest area was 4mm apical to the CEJ.

Palatal cortical bone was thickest 6mm apical to the CEJ in groups 1 and 2  in groups one and 3, and 2mm apical to the CEJ in group 2

Along the midpalatal suture the palatal mucosa was thickest at a point 4mm from the Incisive Papilla and remained uniformly thick 1 mm posterior to this point

The author suggests:

Placing the implant is thin soft tissue reduces the likelihood of inflammation; Because the main objective of placing an orthodontic screw to to gain maximum retention by placing the screw in an area with the thinnest soft tissue and the thinnest soft tissue and the thickest cortical bone, positioning the screw 6 mm from the the line connecting the the buccal and palatal CEJ and angulating the screw placement path might be a good procedure.

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