Narendar N. Soni

Effect of Removal of the Temporal Muscle on the Coronoid Process in Guinea Pigs : Quantitative Triple Fluorochrome Study

A triple fluorochrome labeling sequence was used to measure the osseous activity in the coronoid process after the removal of the temporal muscle. Statistically significant differences between the control and the experimental animals were found for hematoporphyrin, DCAF, DCTC, and total labeled bone.

Quantitative Study of Bone Activity in Alveolar and Femoral Bone of the Guinea Pig

Tracings of microradiographic projections were measured with a planimeter to assess bone-forming activity. Values for forming bone were higher in the maxilla than in the mandible. In femoral bone, the high to low values were in the metaphysis, the epiphysis, and the diaphysis, respectively. The inverse relationship was found between forming and static bone.

Histologic study of pulp capping in rat molars using calcitonin.

Calcitonin, a calcium regulating hormone, has been found to affect bone formation and resorption. In this study a calcitonin preparation and a calcium hydroxide preparation for comparison were applied to both exposed and unexposed rat molar pulps. Histologic examinations were conducted after periods of 1 day to 28 days. Calcium hydroxide pulp caps produced varying amounts of secondary dentin and inflammation. Calcitonin applied as an indirect agent had a similar effect. When calcitonin was applied to exposed pulp, a large amount of dense fibrous connective tissue reminiscent of scar tissue was formed. With increased time this connective tissue exhibited signs of progressive, orderly calcification continuing through a large portion of the coronal pulp.

A MICRORADIOGRAPHIC-MICROPHOTOMETRIC AND POLARIZED-LIGHT STUDY OF THE DEMINERALIZATION PATTERN IN CARIOUS LESIONS.

Abstract The pattern of demineralization in incipient and advanced carious lesions in the enamel of deciduous and permanent teeth was studied in hand-lapped planoparallel ground sections by microradiographic-microphotometric and polarized-light procedures. Polarized-light and microradiographic examination revealed that incipient carious lesions had a higher mineral content at the outer surface as compared to underlying enamel, the latter having varying degrees of demineralization in different areas. There was no indication of hypercalcified areas. The progress of the lesion along the striae of Retzius and the interprismatic substance was disclosed. From without inward, the main body of the lesion, the dark zone, and the translucent zone could be identified. In some cases there appeared to be an additional translucent zone within the central part of the lesion. Comparison of densitometric tracings of microradiographs and intrinsic retardation measurements showed greatest demineralization in the dark zone and minimal demineralization in the translucent zone. A similarity was found between carious lesions in deciduous and permanent teeth.

Mandibular Condylectomy in the Guinea Pig: Quantitative Triple Fluorochrome Study

Different-colored fluorochromes were administered sequentially to guinea pigs and the rate of bone formation measured in their condylectomized and control contralateral hemimandibles. The differences in values of condylectomized and control contralateral sides for demethylchlortetracycline- and total surface area-labeled bone were statistically signifrcant but were not significant for 2,5-bis [N-N1 -di-(Carbomethyl) aminomethyl]- and hematoporphyrin-labeled bone.

Polarized Light and Microradiographic Study of Dental Tissues in Dentinogenesis Imperfecta

Several investigators have reported on the clinical features and histological, chemical, and radiographic findings in the teeth with dentinogenesis imperfecta.1-4 Although Xray absorption studies have shown that dentin formation is greatly disturbed and often irregularly and poorly mineralized,57 studies of the effects of this disease on cementum and circumpulpal and root dentin have not been reported extensively or in detail. The present study has been conducted to observe the effects of dentinogenesis imperfecta on crown dentin and to study the morphological changes in cementum and circumpulpal and root dentin, as evaluated by microradiographic and polarized light technics.

Long-range effects of Ivalon sponge containing isobutyl cyanoacrylates on rat tissue: A quantitative planimetric study☆

This study on seventy rats was undertaken to determine the long-range effects of Ivalon sponge containing isobutyl cyanoacrylates (IBC). Histologic examination revealed that IBC sponge was well tolerated by the connective tissue. IBC sponge was most effective during the first 2 weeks of healing. At observation periods of 1 and 2 weeks, the percentage values for connective tissue formed in IBC-treated animals were 2.02 and 1.58 times higher than those in the untreated animals.

Compound composite odontoma: Report of two cases☆

Abstract Two cases of compound composite odontomas, one containing seven and the other containing seventeen small toothlike structures, have been presented. One of these tumors occurred in relation to an unerupted maxillary cuspid and the other occurred in relation to an unerupted mandibular cuspid. When ground sections from some of the small toothlike structures recovered from these odontomas were examined by means of polarizing-light microscopy, it was observed that the enamel, dentine, and cementum showed pronounced changes. There were hypoplastic areas and diffuse hypomineralized zones in the enamel. Dentine formation was greatly disturbed and showed the presence of interglobular dentine, atypical arrangement of dentinal tubules, and bulbous areas of dentine formation. In a few instances cementum deposition appeared to be excessive. Large areas of cementum and dentine were resorbed and repaired by cementum.

Microradiographic Study of Odontologic Tissues in Cooley's Anemia

SYNOPSIS IN INTERLINGUA STUDIO MICRORADIOGRAPHIC DE Tissu ODONTOLOGIC IN ANEMIA DE COOLEY.— Le presente studio esseva effectuate pro determinar le effectos de anemia de Cooley super le configuration del mineralisation e le morphologia del dentes e de lor structuras de supporto. Sectiones mollite esseva obtenite ab specimens includitein bioplastico. Examines microradiographic revelava que le dentina esseva mal mineralisate e que inusual inclusiones esseva presente in le lumines del tubulos. Esseva constatate proliferation de cemento de radice. In le osso, numerose irregularmente resorbite cavitates esseva presente si ben como areas interstitial con multe lacunas e tenue cortice attenuate e discontinue.

Polarized Light Study of Enamel and Dentin Dysplasia

Twelve teeth from three patients with enamel and dentin dysplasia were investigated by polarized light microscopy. Clinically and radiographically, the changes were similar to amelogenesis imperfecta. Polarized light examination revealed poorly mineralized enamel and regions of dysplastic globular masses in enamel. The dentinal tubules were sparse, irregular, and tortuous.