Seymour H. Yale

Laminagraphic cephalometry in the analysis of mandibular condyle morphology: A preliminary report

Abstract 1. Using two fixed reference planes, the vertical and horizontal angles of fifty mandibular condyles were measured. All condyles were found to fall into one of three groups. 2. Each condyle was roentgenographed by techniques of standard cephalometric pantomography, conventional cephalometric laminagraphy, and corrected cephalometric laminagraphy. In the latter method, the correction in condylar position was made to conform with the measured vertical and horizontal angles of each condyle. 3. Condylar image distortion and geometric condylar image enlargement were analyzed for each roentgenographic method. Corrected cephalometric laminagraphy was found to produce the most accurate lateral roentgenographic image of the mandibular condyle.

Some observations on the classification of mandibular condyle types

Abstract Four types of mandibular condyle were described, encompassing 97.1% of the condyles in two collections. While condylar Types B and A predominated in the Terry collection, Types C and B occurred most frequently in the pre-Hispanic group. In the Terry material there appeared to be a relationship between incidence of condylar type and state of the dentition. Although no apparent sex dependence was demonstrated in this group, a limited relationship between condylar type and race seemed to occur. In the combined collections, 78.5 per cent of the mandibles showed symmetry of condylar type.

Oral Changes in Normal and Scorbutic Guinea Pigs Injected with Ascorbic Acid-1-C 14

HE USE of various vitamins in the treatment of some oral pathologic conditions has been recognized. One of the vitamins that has long held the interest of the dental profession is ascorbic acid since scurvy and some forms of gingivitis have been known to respond to the oral administration of the vitamin. It should be borne in mind that this vitamin is used in practice in spite of the fact that our knowledge of its role in the metabolism of oral tissues is not understood. In scientific investigations to determine the function of ascorbic acid in oral tissues, it has been customary to utilize the research technics of a single basic science. However, in combining the efforts of the separate research disciplines in radiology, histology, and biochemistry, as we have attempted in our study, a novel, more comprehensive approach has been provided for the analysis of the basic mechanisms in ascorbic acid metabolism by oral tissues. In our studies utilizing normal and scorbutic guinea pigs injected intraperitoneally with radioactive ascorbic acid, radioautographid methods localized radioactive uptake in pulp, periodontal membrane, alveolar periosteum, cortical and supporting bone. By histochemical staining technics, the vitamin was identified and localized adjacent to the odontoblastic layer of the pulp, in the interlobar and interlobular connective tissue of the submaxillary gland and within the adrenals. By biochemical analysis, we were able to correlate the radioautographic and histochemical findings by identifying the same pattern of distribution of radioactivity in the tissues described. Neither radioautography, histochemical staining for ascorbic acid, nor chemical analysis revealed any ascorbic acid in the enamel or dentin. In addition, our biochemical studies revealed that these oral tissues showing specific pathology

Variations in x-ray barrier efficiency of some commonly used building materials

Abstract A study was made of the variations in x-ray barrier efficiency of some commonly used building materials. The investigation was initiated because the growing popularity of multiple-office professional buildings presents a special problem in the control of radiation emanating from x-ray machines in adjuacent offices.

Radiographic evaluation of defects created in mandibular condyles.

mandibular condyles. NIVALDO GONCALVES, CD, D.CO., D.L., M.s., ALAN M. MILLER, D.D.s., SEYMOUR H. YALE, D.D.s., HENRY M. ROSENBERG, D.D.s., and J. DONALD HAUPTFUEHRER, Chicago, Ill. Oral. Surg. 38:474-489 (1974) Twenty-four defects were created in mandibular condyles. These were divided into two groups of twelve (small and large). Seven radiographic techniques were utilized, and their effectiveness in demonstrating these defects was evaluated. A variety of condyles was selected for evaluation with respect to size as well as horizontal and vertical angulation. The created defects varied greatly with respect to size and location. After examination of each of the created defects in the condyles with each of the radiographic techniques, the created defects were localized with silver amalgam and reexamined with the radiographic techniques. The radiographs of each condyle were compared for visualization of the defects. With all techniques used in this study, visualization of the smaller defects was very poor. The technique that scored the highest for visualization of all defects was corrected anteriorposterior laminagraphy. L. R. Manson-Hing