Schwartz-Korkhaus Analysis

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Dr. Derek Mahony
Schwartz-Korkhaus
Model Analysis

Doctor Name

Patient Name

Phone with Area Code Age Sex Date

	Actual	Ideal	Discrepancy
A
B
C
D
C1
B1

Arch Symmetry-Symmetroscope Check
Collapse of buccal quadrant:	Upper Left	Upper Right
	Lower Left	Lower Right
Forward shift: molars	Upper Left	Upper Right
	Lower Left	Lower Right
Upper midline shift:	Left____ mm	Right____ mm
Lower midline shift:	Left____ mm	Left_____ mm

	Class I		Open Bite
	Class II Division 1		Closed Bite
	Class II Division 2		Unilateral
	Class III		Bilateral
			Other ________

Subdivision:		Left		Right
Skeletal Midline:		Left		Right		OK

MANDIBULAR PLANE ANGLE
	Flat		Normal		Steep

A	B, B1	C	C1	D
27	34	43.5	42.5	18
27.5	34.5	44.3	43.3	18.3
28	35	45	44	18.5
28.5	35.5	45.8	44.8	18.8
29	36	46.5	45.5	19
29.5	36.7	47.3	46.3	19.3
30	37.5	48	47	19.5
30.5	38	48.8	47.8	19.8
31	38.5	49.5	48.5	20
31.5	39	50.5	49.5	20.3
32	39.5	51	50	20.5
32.5	40.2	52	51	20.8
33	41	53	52	21
33.5	41.5	53.5	52.5	21.3
34	42	54.5	53.5	21.5
34.5	42.5	55	54	21.8
35	43.2	56	55	22
35.5	44	56.5	55.5	22.5
36	44.5	57.5	56.5	23

Step by Step
Schwartz-Korkhaus Analysis

Take the Boley Gauge and measures the width of the four Maxillary incisors. The sum total of the incisors is the S. I. Value. Locate the Value under A.

Value A gives you the genetic potential values for the 4 x 4 and 6 x 6 measurements on both upper and lower arches when measurements are taken using the circles as shown on the top left side of the Schwartz-Korkhaus card. The upper 4 x 4 genetic potential is indicated as B, the lower is indicated as B¹; (values are the same). The upper 6 x 6 is indicated as C. The lower 6 x 6 is indicated as C¹. Record the genetic potential values and measures the patient's models for comparison. The difference between those values will give us guidelines for determining the arch development needed and for choosing appliances. The mandibular 6 x 6 is always developed 1 mm less than the Maxillary 6 x 6 to prevent the accidental formation of a cross bite.

Example A Value = 32 mm

Genetic Potential Patients Difference

Max 4 x 4 = 39.5 mm 33.0 mm -6.5 mm under

Max 6 x 6 = 51.0 mm 46.0 mm -5.0 mm under

Man 4 x 4 = 39.5 mm 36.0 mm -3.5 mm under

Man 6 x 6 = 50.0 mm 51.5 mm +1.5 mm over

The number indicated above as D gives you a ideal measurement for determining the severity of Division II cases. To measure the actual D, take the millimeter symmetry grid and place a horizontal reference line on the central fosse of the first bicuspids of deciduous first molars as shown by the line between the circles on the card. The length of the perpendicular line to the mesial - labial contact point between the centrals will be the patient's actual measurement. The difference between ideal D and patient's actual D measurement will show you the positioning needed for the Maxillary incisors.

Example A=32 mm
               Div. II (D)
               Gen. Potential        = 20.5 mm
               i.e. Actual              = 14.5
               Difference 6.0 mm = Sagittal suggested

Symmetry Grid

The Symmetry Grid is used for determining asymmetries in the arch by placing the grid on the model using the skeletal mid lines as a base for a reference. The measurements can be made both transversely and sagittally. (by lining up on the mesial of a molar you can check for the asymmetrical shift of the opposite molar)

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