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At least 37 records · Page 2Linked to original sources
PubMed1975

Ultrasonic cephalometry: Its use in estimating fetal weight.

Data on 100 consecutive patients delivering within 1 week after ultrasonic cephalometry measurement were reviewed to assess the weight-predicting potential of three known formulas. With Thompson's formula, 78% of infant weights fell within a range of 350 g, the absolute mean error for the 100 cases being 267 g. Excluding cases of fetal malnutrition, when the biparietal diameter (BPD) obtained was 8.3 cm or more, all newborn babies weighed more than 2000 g, and with a BPD of 8.7 cm or more they all exceeded 2500 g. Ninety percent of newborn babies in whom the in utero BPD was 9.1 cm or more weighed more than 3000 g. These values compared very favorably with those from other series and, thus, demonstrate the usefulness of this type of assessment.

Birth Weight↗
PubMed1975

[The importance of ultra-sound cephalometry for the prediction of the date of delivery--a contribution to the assessment of duration of pregnancy (author's transl)].

On the basis of some statistical data ultrasound cephalometry for the prediction of term is discussed. These data should be considered when providing socalled test-graphs. The usefulness of the author's own standard graph is examined. Prediction with the biparietal diameter is not much less exact than after the rule of Naegele. Accuracy of prediction can be much improved by using both methods together, starting from the averages of both.

Cephalometry↗
PubMed1986

[Processing of cephalometry: Delaire's architectural and structural analysis].

This work purpose a performing system for the Cephalometry: Cephor a software for Delaire's analysis. From a radiography, we draw outlines on graphic tablet. Following in a short time, we obtain results: precise diagnosis permitting to establish a care plan. This care plan is indicated on the screen where we can simulate correction from a choised therapeutic (osteotomy for example). Moreover, this soft ware allows to survey numerically and graphically a treatment, allows to use others methods (Tweed, Ricketts, Steiner). Technological advantages rest on a hard gain of time and a precision gain. The large handiness of this system allows reproducible measures easily. Therefore, we own with this software an improvement and a performing system.

Cephalometry↗
PubMed1995

The reproducibility and the validity of landmarks for the antero-inferior part of the maxilla in radiographic cephalometry.

Two possible landmarks, C1 and C2, were evaluated as alternatives to the A point (subspinale), in lateral radiographic cephalometry. The landmarks were determined on tracings of 25 straight lateral radiographs. Horizontal and vertical coordinates were recorded for C1 and C2, and also for point A, and the incisor edge and apex. The reproducibilities of the landmarks were determined by statistical analyses of the differences between landmark determinations on repeated tracings. Regression analyses were used to evaluate the validity of measurements on C1 and C2 in relation to corresponding measurements on the A point. In addition, the influences of upper incisor inclinations and of alveolar process inclinations on validity were investigated by regression analyses and analytical geometry, respectively. The reproducibility of all landmarks including C1 and C2 was high (correlation coefficients above 0.985). Both C1 and C2 were strongly correlated with point A (adjusted R2 values from 82 to 85 per cent). The inclination of the lingual aspect of the alveolar process may change from an alteration of the incisor inclination. When this happens, the positional change of C2 horizontally is smaller than the change of C1. Therefore, C2 appears to be the more valid landmark for horizontal measurements. The designation suggested for this landmark is C.

Alveolar Process↗
PubMed1979

Sonar cephalometry in twins: a table of biparietal diameters for normal twin fetuses and a comparison with singletons.

In 123 normal twin pregnancies, 589 biparietal diameter (BPD) measurements were obtained between 16 and 40 weeks' gestation and mean values for each week were computed. A table of BPDs for normal twin pregnancies based on these data is proposed. Mean twin BPDs were consistently smaller than those of singletons, the difference averaging 3.5 mm between 16 and 40 weeks' gestation. The development of a twin BPD table now permits a more accurate assessment of twin gestational age and fetal growth.

Cephalometry↗
PubMed1980

Sonar fetal cephalometry: comparison of bistable with gray scale and real-time techniques.

The fetal biparietal diameter was measured simultaneously with B-scan bistable and gray scale techniques and subsequently with real-time ultrasonography. Measurements were made from outer table to outer table with the bistable technique, which has been proven to be accurate and reliable. With the gray scale and real-time modalities, distances were measured between several landmarks from the same image. Off all measurements taken from gray scale and realtime images, those between the centers of each band outlining the fetal skull showed the best correlation and the closest values to measurements using the standard bistable technique. Discrepancies exceeded 2 mm in only 5% with the gray scale and in 2% with the real-time technique. Using the measurement between outer and inner aspects of the cephalic band, the percentages of discrepancies exceeding 2 mm were 7% with gray scale and 6% with real time.

Cephalometry↗
PubMed1975

Variability of the craniofacial skeleton. III. Radiographic cephalometry of juvenile Macaca mulatta.

The variability of the craniofacial skeleton of the juvenile Macaca mulatta was studied from lateral radiographic cephalograms of twenty-three animals, using a previously described method based on fourteen lines depicting certain anatomic features. The findings, when compared to corresponding human data, revealed that a number of angular relationships are similar in this monkey and in human childrena and adults. The same is true regarding the variability of individual lines. These similarities suggest that biologic similarities exist in the cranio-facial skeletal architecture in these species. Specifically, the findings in the Macaca mulatta were in agreement with previous findings in human children and adults as regards the parallelism between the anterior parts of the neurovascular canals of the upper and lower jaws and the apparently adaptive role of the ramus and the condyle.

Age Factors↗
PubMed1978

Landmark identification accuracy in xeroradiographic cephalometry.

Identification accuracy of fourteen cephalometric landmarks was compared between xeroradiographic cephalograms and conventional cephalograms. Four landmarks--point A, upper incisor tip, infradentale, and menton--were more accurately determined on the xeroradiograph, while two landmarks--point B and condylion--were more accurately determined on the conventional cephalogram. Although not conclusively demonstrated in this study, the xeroradiograph does appear to offer more clarity and detail than the conventional cephalogram. Further investigation of this new diagnostic medium will be necessary before its true significance to dentistry can be evaluated.

Cephalometry↗
PubMed1979

Interobserver reliability in xeroradiographic cephalometry.

Observer agreement on cephalometric landmarks was compared between xeroradiographs and conventional radiographs of twenty-nine patients. Of fourteen landmarks evaluated, four (condylion, infradentale, Ptm, and ANS) demonstrated clinical significance in favor of the xeroradiograph. In addition, six other landmarks favored the xeroradiograph but not to the degree of statistical significance.

Adolescent↗