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At least 1,369 records · Page 76Linked to original sources
PubMed1984

An application of the moiré method to three-dimensional measurements of the occlusal aspects of molars.

Moiré photographs of the occlusal surface of human molars were made by means of a specially designed apparatus for moiré contourography. Since molars show contour lines with equal intervals, three-dimensional measurement of the complicated relief of the occlusal surface is possible. The positioning of molar teeth for making the photographs and the technique of the moiré photography for small objects were presented. The three-dimensional measuring method of the molar surface and its use for anthropological purpose were discussed.

Dental Occlusion↗
PubMed1981

Computer graphics in facial morphology analysis.

Stereophotogrammetry is an attractive technique for mapping changes in facial form and contour following surgery. The need for trained personnel, however, has prevented the technique from gaining wide use. We report the development of a stereophotogrammetric system in combination with an inter-graphics computer system which overcomes this and other limitations. An interactive computer graphics system is used to record, present and manipulate the three-dimensional data obtained from a digitized stereophotogrammetric picture. The system also permits measurement of morphological changes following surgery as well as volume changes and has the potential for use in indicating the order in which multistage procedures should be undertaken and the time delay before such surgeries.

Cephalometry↗
PubMed1980

Movement of the cleft maxilla in infants relative to the frontal bone. A roentgen stereophotogrammetric study with the aid of metallic implants.

Four implants (tantalum balls 0.5 mm in diameter) were inserted in the frontal bone, and three implants (tantalum pins 1.5 x 0.5 mm) were inserted in each lateral segment of the cleft maxilla of ten infants aged 13 to 42 months. Motion of the maxillary segments was studied relative to the frontal bone by means of roentgen stereophotogrammetry during observation periods from 371 to 868 days. The results were presented by means of computer drawings of the implant triangles projected on the three cardinal planes. With this technique, movement of the maxillary segments could be visualized with a high degree of accuracy. No pattern of movement related to time or type of surgery, to type of cleft (UCLP/BCLP), or to cleft or non-cleft segment could be found.

Cephalometry↗
PubMed1981

Growth in hemifacial microsomia studied with the aid of roentgen stereophotogrammetry and metallic implants.

Displacement of the mandible and of the maxillary bones with growth was studied in 11 children with hemifacial microsomia. The subjects were from three to 14 years of age at the initial examination and were observed over a period of 350 to 1218 days. Roentgen stereophotogrammetry with the aid of metallic implants proved to be an efficient method for highly accurate recordings of growth relative to the frontal bone. Complicated movements of the jaws occurred and either increased or decreased the degree of facial asymmetry. No correlation could be found between the extent of the mandibular deformity as seen on orthopantomograms and the displacement of the mandible with growth. Generally, the displacement of the maxillary bones corresponded with the displacement of the mandible.

Adolescent↗
PubMed1982

An optical profilometer-a new instrument for the three dimensional measurement of cleft palate casts.

A technique is described for obtaining spatial characterization of three dimensional cleft palate surfaces using a noncontact optical profilometer. The operational design is discussed and an evaluation of the system is presented to demonstrate the feasibility of its use for the measurement of cleft palate casts. Measurement results are presented for several test surfaces and cleft palate casts. Accuracy in the X axis is +/- .79 mm., in the Y axis it is +/- 1.3 mm and in the Z axis +/- .46 mm.

Calibration↗