Regeneration of junctional epithelium and its innervation. Although numerous reports have demonstrated that the junctional epithelium je is derived from the reduced enamel epithelium ree, the fate of the ree. Eine retrospektive sulcus and coronal junctional epithelium in mild gingivitis. He staining and image analysis were performed to measure and compare the morphological difference among je, oral. Which one of the following structures is referred to as a semipermeable structure. Junctional epithelium je, which is derived from odontogenic epithelial cells immediately after eruption, is believed to be gradually replaced by oral gingival epithelium oge over a lifetime.
Junctional epithelium periodontal disease click to. Tight junctional molecules were localized to the lower two thirds of the epithelium in a spiderweblike pattern, indicative of their function in cellcell adhesion fig. Junctional epithelium synonyms, junctional epithelium. Regeneration of junctional epithelium and its innervation in. The probing depth of the gingival sulcus is measured by a calibrated periodontal probe. The junctional epithelium originates from the odontogenic. Jul 01, 2011 tight junctional molecules were localized to the lower two thirds of the epithelium in a spiderweblike pattern, indicative of their function in cellcell adhesion fig.
The junctional epithelium je is that epithelium which lies at, and in health also defines, the base of the gingival sulcus. The unique function of epithelia lies in providing a boundary. It forms a band 23 mm wide around the tooth, and is approximately 1530 cells thick coronally and tapers to a single cell apically. In rodents, the je is clearly distinguished from ose. The mean values of junctional strands from the lateral, third, and fourth ventricles of lewis rats were 7. Junctional epithelium from wikipedia, the free encyclopedia. But even in such assessments, residual junctional epithelium cannot be overlooked. Junctional epithelium je, which is derived from odontogenic epithelial cells immediately after eruption, is believed to be gradually replaced by. Bmc oral health morphological and functional characteristics of human gingival junctional epithelium qian jiang 0 youcheng yu 0 hong ruan 0 yin luo 0 xuehua guo 0 0 department of stomatology, zhongshan hospital fudan university, 180 fenglin road, shanghai 200032, china background. Quizlet flashcards, activities and games help you improve your grades. Paraffin sections of human molar or premolar on the gingival buccolingual side were prepared from 6 subjects. The junctional epithelium and its relationship to the tooth surface. Read regeneration of junctional epithelium and its innervation in adult rats.
Which one of the following types of bone lines the tooth socket. Histological and immunological characteristics of the junctional. Smad2 overexpression reduces the proliferation of the junctional epithelium. In addition, the cellular dynamics of the epithelium were also evaluated at the end of three and six mo. Junctional epithelium an overview sciencedirect topics. Morphological and functional characteristics of human. Visualization of junctional epithelial cell replacement by. Research has shown that the junctional epithelial cells may play a much more active role in the innate defense mechanisms than previously assumed. There are three characteristic types of epithelial cells. The junctional epithelium is located at a strategically important interface between the gingival sulcus, populated with bacteria, and the periodontal soft and mineralized connective tissues that need protection from becoming exposed to bacteria and. The gingival epithelium is the physiologically important interface between the bacterially colonized gingival sulcus and periodontal soft and mineralized connective tissues, requiring protection from exposure to bacteria and their products. He staining and image analysis were performed to measure and compare the morphological difference among je, oral gingival. Hence, the aim of the present study was to characterize the cell adhesion structure in the junctional epithelium compared with the other two epithelia. However, the reduced enamel epithelium is not essential for its formation.
The epithelium is closely packed, has little intercellular material, and is lacking in blood vessels. They are localized at the gingival margin where there is the most exposure to oral bacteria of the plaque on the tooth surface, but not in the junctional epithelium. The gingival epithelium consists of the oral gingival epithelium oge, oral sulcular epithelium ose, and junctional epithelium je fig. I he junctional epithelium is formed by the continence of the oral epithelium and the reduced enamel epithelium during tooth eruption d ig. Epithelial structure and function mit opencourseware. Tooth eruption collapses the continuity of epithelial tissue in the oral cavity. Junctional epithelium the junctional epithelium je adjacent to the tooth is that part of the gingiva which attaches the connective tissue to the tooth surface fig. The expression of ceacam1 remains at high levels in the junctional epithelium, in contrast to the surrounding oral sulcular epithelium which shows much lower expression levels. Junctional epithelium wikipedia as written by mjf peggydoll. Dolichos biflorus agglutinin reacted uniquely with junctional epithelium, not staining other gingival cells of nonblood group a1 donors. In vitro reconstruction of human junctional and sulcular. C this article has been rated as cclass on the projects quality scale. Histological and immunological characteristics of the. Oct 16, 2019 b, in a periodontal pocket with a short junctional epithelium between arrows, the probe penetrates beyond the apical end ot the junctional epithelium.
However, of the three epithelia comprising the gingival epithelium, the junctional epithelium has much wider. The epithelia of a number of glands and cavitary organs of the rat and guinea pig have been surveyed, and in all cases investigated, a characteristic tripartite junctional complex has been found between adjacent cells. B, in a periodontal pocket with a short junctional epithelium between arrows, the probe penetrates beyond the apical end ot the junctional epithelium. Key words freeze fracture complementary replicas choroid plexus epithelium tight junctions permeability properties. Junctional complexes in various epithelia journal of. Junctional epithelium, gingival connective tissue attachment. The most damaging characteristic of an angle class ii, division 2 malocclusion is the for teeth prepared as abutments for fixed bridges, unsatisfactory temporary crown restorations may result in 1. Ecadherin and f11r had a similar pattern of distribution, with expression brightest in the parabasal and basal layers. Introduction junctional epithelium development of junctional epithelium structure epithelial attachment dynamic aspects of junctional epithelium expression of various molecules and their functions permeability functions regeneration role of. Position of gingival margin and junctional epithelium. The junctional epithelium is located at a strategically important interface between the gingival sulcus, populated with bacteria, and the periodontal soft and mineralized connective tissues that need protection from becoming exposed to bacteria and their products. Jun 25, 2017 junctional epithelium from wikipedia, the free encyclopedia.
Position of gingival margin and junctional epithelium a thorough examination of the gingiva includes evaluation of color, size, shape form or contour, consistency, surface texture, position of the gingival margin and junctional epithelium, mucogingival junctions, bleeding and exudate. A particulate nature of the junctional strands could be established by using unfixed material. Junctional epithelium or epithelial attachment around implant. This study aims to observe the morphological characteristics and identify the function characteristics of. All cells rest on the basement membrane basal surface and all cells face the free surface. This article is within the scope of wikiproject anatomy, a collaborative effort to improve the coverage of anatomy on wikipedia. Epithelia exhibit considerable differences in their histology. Besides, neutrophil adefensins was found to localize in the junctional epithelium, which has significant effects on the epithelial integrity and. Consider my opinion as a minor supplement to abhyudaya shrivastava. This study aims to observe the morphological characteristics and identify the function characteristics of junctional epithelium je tissues and cultured je cells. Among them, the je attaches to the tooth surface via hemidesmosomes, which forms the frontline of defense against periodontal bacterial infection. However, loss of junctional material during fracturing is also considered as an alternative explanation of the present results.
Structure and function of intercellular junctions in human. May 21, 2019 junctional epithelium je, which is derived from odontogenic epithelial cells immediately after eruption, is believed to be gradually replaced by oral gingival epithelium oge over a lifetime. The junctional epithelium je is attached to the tooth surface by hemidesmosomes, which constitutes the frontline defense. Junctional epithelium is derived from the reduced enamel epithelium during tooth development.
Junctional epithelium expresses a cytokeratin19 immunoreaction, suggesting that this protein is a consistent differentiation marker. The junctional epithelium je is an epithelial component that is directly attached to the tooth surface and has a protective function against periodontal diseases. Junctional epithelium is derived from the reduced enamel epithelium ree during tooth development. Biological characteristics of the junctional epithelium. Therefore, the constitutive expression of cytokines in junctional epithelium might be related to the morphological and functional homeostasis of the junctional. The characteristic cellular organization and ceacam1. However, the cells of the secondary junctional epithelium seem to be derived from the oral gingival epithelium, since they showed to have a similar pattern of coexpression of certain keratins mackenzie et al.
Morphological and functional characteristics of human gingival junctional epithelium qian jiang, youcheng yu, hong ruan, yin luo and xuehua guo abstract background. The junctional epithelium, once it has migrated apically. Junctional epithelium located at an interface of gingival sulcus and periodontal connective tissue, provides a dynamic seal around the teeth, protecting the. Unlimited viewing of the articlechapter pdf and any associated supplements and figures. The je mediates the attachment of gingiva to the teeth through hemidesmosomes and the internal basal lamina with a unique basement membrane bm composition, while being attached to the connective. Ecadherin and f11r had a similar pattern of distribution, with expression brightest in the parabasal and basal layers fig. The results of this study indicated that this model system cannot be used. Jun 26, 2006 however, of the three epithelia comprising the gingival epithelium, the junctional epithelium has much wider intercellular spaces than the sulcular epithelium and oral gingival epithelium. Download pdf full article content list introduction. Junctional epithelium definition of junctional epithelium. The conversion of the junctional to pocket epithelium, which is regarded as a hallmark in disease initiation, has been the focus of intense research in recent years. There are three types of mucous membranes masticatory, lining, and specialized line the oral cavity and form the structural boundary between the body and the external environment. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks. Junctional epithelium cells constitutively expressed several types of chemokines and cytokines and the expression of chemokines was augmented by bacterial infection.
We have studied lectin reactivity in normal human junctional, sulcular, and attached gingival epithelia with 15 lectins and identified the epithelia by parallel staining with monoclonal antikeratin antibodies. Junctional epithelium, maybe a kind of immature epithelium, could be regarded as an extension of sulcular epithelium, which functions to seal the. Although the complex differs in precise arrangement from one organ to another, it has been regularly encountered in the mucosal. The junctional epithelium is located at a strategically important interface. As the tooth actively erupts, the coronal part of the fused and surrounding. Thus, the junctional epithelium is protected by alphadefensins and ll37 released from neutrophils, while the differentiated, stratified epithelia are protected by betadefensins. Apoptosis occurs in the border between oral and reduced enamel epithelia during tooth eruption. In this study, we determined the origin of the je using a bioengineered tooth technique. Role of the junctional epithelium in periodontal innate. Lining and covering epithelial tissues method of classification classification by number of layers simple epithelium 1. Morphological and functional characteristics of human gingival. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Before the eruption of the tooth and after enamel maturation, the ameloblasts secrete a basal lamina on the tooth surface that serves as a part of the primary ea.
May 02, 2014 the junctional epithelium je is an epithelial component that is directly attached to the tooth surface and has a protective function against periodontal diseases. Long junctional epithelium definition of long junctional. Synonyms for junctional epithelium in free thesaurus. Mid this article has been rated as midimportance on the project. Junctional epithelium article about junctional epithelium. The junctional epithelium je adjacent to the tooth is that part of the gingiva which attaches the connective tissue to the tooth surface fig. Pdf biological characteristics of junctional epithelium. Junctional epithelium or epithelial attachment around. We investigated if the high expression levels of ceacam1 and the loosely organized cells characteristic of the junctional epithelium are genetically programmed or result. Expression pattern of adhesion molecules in junctional. Visualization of junctional epithelial cell replacement by oral gingival.
1544 879 385 16 307 1111 1090 1575 446 1176 230 671 811 1481 447 952 932 414 508 628 964 1373 1658 815 1499 268 1292 495 1259 1394 622 1275 502 442 397 103 1280 42 724 681 1421 1432 1415 840 100 729