Bilateral symmetrical lymphangiomas of the gingiva: case report

BACKGROUND: Lymphangioma is a benign lesion that is related to proliferation of lymphatic vessels. Lymphangioma of the gingiva is a rare lesion that manifest as a pebbly hyperplasia on gingiva. The purpose of this study is to report a case of bilateral symmetrical lymphangioma of the gingiva. CASE PRESENTATION: A 32-year-old man was presented with bilateral hyperplasia of gingiva in upper canine regions. The lesions were resected completely and evaluated histologically. The microscopic evaluation revealed lymphangioma. CONCLUSION: Bilateral lymphangioma of the gingiva is a very rare lesion which its origin is controversial

Studies in tooth movement

This thesis describes work investigating the mechanisms that result in the eruption of teeth out of the jaws into the mouth, as well as the post-eruptive continuous emergence of teeth once they have entered the mouth. First Chapter summarizes relevant literature on the formation and movement of teeth, and identifies difficulties with the current widely accepted concept of an 'eruptive force' driving teeth into the mouth. Chapter 2 outlines relevant biomechanical principles for Finite Element Analysis (FEA) and by FEA explores the possible role of functional stress in driving continuous post-eruptive emergence of teeth. Data in Chapter 3 support a new hypothesis for tooth eruption, in which the follicular soft tissues detect bite-force-induced bone-strain, and direct bone remodeling at the inner surface of the surrounding bony crypt, with the effect of enabling tooth eruption into the mouth. Consequent to work described in Chapter 3, was a need to further characterize mechanosensor activity in dental follicle cells, to that end, Chapter 4 outlines the relevant literature and describes experimental work examining the possible mechanosensor response of cultured dental follicle cells isolated from tissue obtained from extracted wisdom teeth

Static telepathology in cancer institute of Tehran university: report of the first academic experience in Iran

<p>Abstract</p> <p>Telepathology is the practice of pathology, which allows quick and timely access to an expert opinion at a distance. We analyzed our new experience in cancer Institute of Tehran University of Medical Sciences with the iPath telepathology server of Basel University. One hundred sixty one cases in a period of 32 months were consulted. These cases received for second evaluation but the definite diagnosis could not be made in this centre. The number of images per case ranged from 3 to 32 (mean: 8). Except one case all cases were evaluated by consultants. Definite final diagnosis was achieved in 88/160 (54.7%). Recommendations for further evaluation were offered in 42/160 cases (26%). Major discrepancies were encountered in 30/160 cases (19%). Thirty-nine of the cases (24.3%) were reported within 1 day. The rate of achieving final diagnosis was higher in histological group rather than cytological ones. Increase in number of H&E images had no significant effect on achieving a definite final diagnosis. The rate of achieving final diagnosis in this study is much lower than other similar studies, which could be due to inappropriate sampling images, a potential cause of misdiagnosis in static telepathology. The other possible reason is that all of the cases in this study were problematic cases that a definite diagnosis could not be made for them even in primary consultation. The mean time for achieving a final diagnosis was also more than other studies, which could be for the reasons mentioned above.</p

Percentage distribution of apical soft tissue follicle volume according to the range of hydrostatic stress.

<p>Data for apical soft tissue caps from each unerupted tooth is shown. Generally greater volumes had tensile (dashed lines) as opposed to compressive (solid lines) hydrostatic stress across most hydrostatic stress ranges. Exceptions to this pattern were seen, however, in the right first premolar and right second molar during incisive bite force application, as well as in the two first premolars and the right second premolar and molar, during right molar force application.</p

Percentage distribution of coronal and apical soft tissue follicle volume according to hydrostatic stress.

<p>Data for apical and coronal soft tissue caps, pooled separately from canines and premolars, under incisive or right molar bite force application are shown. For almost all bite force and hydrostatic stress conditions, greater volumes were devoted to compression (solid lines) in coronal follicle tissues, and to tension (dashed lines) in apical follicle tissues.</p

Relative percentage values for compression considering volume (Rel. % of Volume) and Biological Response Units (Rel. %BRU) during application of incisive or molar bite force in pooled incisors and premolars.

<p>Compression in coronal tissues and tension in apical tissues predominated considering both volume and BRU separately, in both bite force conditions studied.</p

Dental follicle compression (red) and tension (green) during incisor or right molar bite force.

<p>The surface of dental follicles is seen from coronal or apical perspectives, while left (L) and right (R) sides are indicated. The upper surfaces of dental follicles for unerupted canines, first premolars and second premolars appeared subject to greater compression during both incisor and right molar loading, as compared with the lower surfaces of the same teeth which were in general subject to greater tension. This general pattern did not, however, appear to apply in the case of the unerupted second molars.</p

The number of finite elements, volumes, as well as the physical properties assigned to each tissue type in the finite element model used in this study.

<p>Young’s modulus and Poisson’s ratio for each tissue modelled was taken from the literature including for enamel, dentine, cancellous bone <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Field2" target="_blank">[53]</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Field4" target="_blank">[63]</a>, Condylar Elastic Support <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Tanaka1" target="_blank">[66]</a>, and dental pulp <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Williams1" target="_blank">[65]</a>. Cortical bone and lamina dura were assumed to have the identical properties <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Field2" target="_blank">[53]</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Field4" target="_blank">[63]</a>, as were the periodontal ligament and dental follicle <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0058803#pone.0058803-Ichim2" target="_blank">[64]</a>.</p

Relative percentage values for compression considering volume (Rel. % of Volume) and Biological Response Units (Rel. %BRU) during application of incisive or molar bite force in individual teeth.

<p>With the exception of second molars, a general pattern of compression in coronal tissues and tension in apical tissues predominated. Considering the relative percentage of volume under compression in canines and premolars only, exceptions (#) were seen in 7 out of 24 instances. Further refinement by evaluation of BRU reduced exceptions to 5 out of 24 (&). 4 of these exceptions (&a) in BRU were within 4 percentage points of the 50% value marking consistency with the general rule, and 3 of these were in right sided apical tissues during right molar biting, likely representing localized asymmetrical effects of molar bite force.</p