Fine Structure Features of Monkey (Macaca Mulatta) Reduced Enamel Epithelium

Provenza, D. Vincent; Sisca, R.F.

doi:10.1902/jop.1970.41.6.313

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…Ultrastrueturally, the cells of the oral end of the proliferating dental lamina contain a better developed cytoskeleton of tonofilaments than the cells in the zone of epithelial rest formation (Provenza & Sisca 1970). This might indicate that the odontogenic keratocyst derives frotn the oral epitbelium rather than tbe rests of tbe dental lamina, a point emphasized by Stoelinga (1971), wbo reported "the often firm adhesion of the cyst wall with tbe overlying mucosa".…”

Section: Epithelial Rests Of the Detital Latttinamentioning

confidence: 76%

“…Whereas the redueed ameloblasts undergo no mitosis, the cells iti the outer layer, although normally similarly inactive, exhibit eonsiderable mitotie activity during the proeess of fusion of this epithelium with that of the oral mueosa during eruption (McHugh 1963, Schroeder & Listgarten 1971. During the proeess of eruption the reduced ameloblasts assume an inereasingly inclined angle to the tooth surface (Provenza & Sisca 1970, Schroeder & Listgarten 1971) and so acquire a more squamoid appearance.…”

Section: Redticed Ettatnel Epitheliummentioning

confidence: 99%

“…Such residues would not normally undergo keratin microcyst formation as occurs in tbe edentulous alveolus because, at least in tbe rnandible, there is no nearby epithelial surface with wbich they might fuse and tbus regress. Such a conclusion is supported by the ultrastructural studies referred to earlier (Provenza & Sisca 1970). Should sucb a microcyst form, it is likely tbat it will lead to clinical cyst formation.…”

Section: Epithelial Rests Of the Detital Latttinamentioning

confidence: 99%

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The pathogenesis of odontogenic cysts: a review

Browne

1975

J Oral Pathology Medicine

137

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Abstract. The pathogenesis of the three common forms of odontogenic cyst is discussed. It is concluded that the dental cyst arises from proliferation of the epithelial rests of Malassez in a focus of inflammation stimulated by pulpal necrosis of the associated tooth. It enlarges by unicentric expansion from the hydrostatic pressure of its contents. The dentigerous cyst arises from pooling of inflammatory exudate, which is derived from the obstructed follicular veins of an unerupted tooth and accumulates between the reduced enamel epithelium and the crown of the tooth. It enlarges by unicentric expansion from the hydrostatic pressure of its contents. The odontogenic keratocyst arises by proliferation of the residues of the dental lamina, possibly as a hamartomatous abnormality. It enlarges by both multicentric expansion due to the proliferation of localized groups of epithelial cells in the lining and by unicentric expansion from the hydrostatic pressure of its contents.

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Section: Epithelial Rests Of the Detital Latttinamentioning

confidence: 76%

Section: Redticed Ettatnel Epitheliummentioning

confidence: 99%

Section: Epithelial Rests Of the Detital Latttinamentioning

confidence: 99%

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The pathogenesis of odontogenic cysts: a review

Browne

1975

J Oral Pathology Medicine

137

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“…Ultrastructural studies of postsecretory ameloblasts in rodents have indicated that cells in the maturation stage may play ati active and important role (Reith 1963, Reith & Cotty 1967, Kallenbach 1968, Josephsen & Fejerskov 1977. Apart from the study by Provenza & Sisca (1970) no detailed studies of the cytology of ameloblasts in the maturation phase in primates are available. However, these findings, together with observations performed on the reduced enamel epithelium in humans (Schroeder & Listgarten 1971) suggest that, despite the apparent differences in the mineralization processes between rodents and primates, the cellular activity itivolved in the maturation of enamel might be similar.…”

Section: Discussionmentioning

confidence: 99%

The influence of traumatic intrusion of primary teeth on their permanent successors in monkeys A macroscopic, polarized light and scanning electron microscopic study

Thylstrup

Andreasen

1977

J Oral Pathology Medicine

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Primary maxillary and mandibular eentral incisors were experimentally intruded on 13 monkeys, in order to examine changes of the enamel in the permanent successors. To study the effect of removal of the displaced tooth, the left primary incisor was extracted 1 h after the trauma, whereas that on the right was left in the jaw. Six weeks later the animals were sacrificed. Maeroscopically, circumscribed areas of opaeities on labial enamel were noted. The SEM examination showed tbat non-affeeted parts of enamel had reached anatomical form, whereas imbibition studies and microradiographs demonstrated that the maturation process was far from complete. Arrest of enamel matur'ation was noted as corresponding to the extent of the surface opacity. In the SEM small areas displaying rupture of the surfaee enamel were seen. No differences were observed either maeroscopically or histologieally in relation to immediate removal or preservation of the intruded primary incisor.

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Organic content in occlusal groove‐fossa‐system in unerupted 3rd mandibular molars: a light and electron microscopic study

Ekstrand

Westergaard

Thylstrup

1991

European J Oral Sciences

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Abstract— A method is described by means of which organic content in fissure areas of 12 unerupted 3rd mandibular molars can be prepared for studies in the light microscope (LM) and in the transmission electron microscope (TEM). Thus, LM and TEM examinations revealed that the organic content throughout the fissure in bone‐covered and in mucosa‐covered 3rd molars with uncompleted root formation consists of cells belonging to the enamel organ in late or in postmaturative stages. In mucosa‐covered teeth with completed root formation it was only possible to identify enamel organ cells at the entrance of the fissure. Deeper parts were occupied by degenerative cells, polymorphonuclear cells and unidentified material. The results indicate that ameloblasts in fissures do not transform to stratified squamous epithelium but gradually degenerate towards terminal stages and remain as such, as the tooth emerges into the oral cavity.

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Fine Structure Features of Monkey (Macaca Mulatta) Reduced Enamel Epithelium

Cited by 3 publications

References 11 publications

The pathogenesis of odontogenic cysts: a review

The pathogenesis of odontogenic cysts: a review

The influence of traumatic intrusion of primary teeth on their permanent successors in monkeys A macroscopic, polarized light and scanning electron microscopic study

Organic content in occlusal groove‐fossa‐system in unerupted 3rd mandibular molars: a light and electron microscopic study

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