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PubMed1980

[Cephalometry: a critical comparative study (author's transl)].

Changes have occurred in the original concepts which led to the current use, either totally or partially, of the various cephalometric tests, and the terminology employed varies from one author to another. A comparative study of the principal measurements used was therefore conducted, based on this acquired knowledge. After discussing the relative values of the reference points and constructions, the authors attempt to establish a relationship between the different evaluation methods used for each element, bony, alveolar, and dental, which are necessary for diagnosis, and for which functional coexistence dominates the prognosis for harmony of the buccodental system.

Cephalometry↗
PubMed1978

Standardization of sonar cephalometry and gestational age.

At present a large number of different charts are used for prediction of gestational age from sonar biparietal diameter (BPD). In this report the reasons for these observed differences are presented. Additionally, the usefulness of all these charts is questioned because a) the mean differences in 7059 BPDs derived by the B-scan from four large fetal population studies are not significantly different from zero and b) BPDs obtained by B scan are statistically comparable to gray-scale or real-time BPDs if medium gain is used. Thus, it is our suggestion that a chart showing the composite mean BPD values of all four studies be used universally for prediction of fetal age. Finally, the guidelines of using sonar BPD as an index of gestational age are presented and the role of the obstetrician in interpreting BPD data is emphasized.

Cephalometry↗
PubMedDate not supplied

Using cephalometry to evaluate maxillomandibular relationships in complete denture construction.

Long-term denture wearers undergo facial changes as a result of occlusal wear of the dentures and residual ridge resorption. This study examined 12 such patients, presenting with a clinical appearance of Angle's Class III occlusal relationships, to evaluate a clinical method of determining the correct mandibular position. Complete dentures were fabricated for each patient using standard clinical procedures, but acrylic resin blocks were left on the mandibular posterior bases instead of denture teeth. Ensuing changes in maxillomandibular relationships were recorded. After the stabilization of the mandibular relationship, the dentures were completed using mandibular posterior teeth. Patients were evaluated using cephalometric analysis before and after treatment. Results show that a careful procedure of denture fabrication allows the determination of the correct mandibular relationship, even in patients who have experienced extreme facial collapse.

Aged↗
PubMed1993

[Cephalometry and digital radiography. Technical note].

Conventional and digital lateral teleradiographs of the skull were performed on 6 consecutive patients (3 men and 3 women). The study was aimed at comparing the diagnostic capabilities of the two imaging techniques to measure points and angles, as derived from different cephalometric analyses (see text for details). These variables were analyzed by three different operators: for both techniques, 18 cephalometric tracings were made, including a total of 414 points and 36 angles. Correlation coefficients between the two types of measurements (points and angles) were calculated; Wilcoxon's non-parametric test was also used. This study demonstrates digital radiography to be superior to conventional radiography to detect cephalometric landmarks, which is especially evident in the evaluation of the so-called "questionable" landmarks: the latter were 15 of 23 with conventional radiography and 9 of 23 with digital radiography. On the other hand, correlation coefficients and significance of the values of the considered angles were in close agreement with the two techniques. Therefore, its simultaneous demonstration of anatomical structures of different thickness--i.e., bone and soft tissues--and its lower exposure dose make digital radiography the diagnostic procedure of choice in cephalometrics, especially in the pediatric age, as well as in monitoring the patients.

Adolescent↗