Around the fifth week of development, a primitive spleen begins to form from the mesoderm of the dorsal mesogastrium. Accessory splenic tissue can develop along the path from the midline that the spleen takes during development, or follow the path of gonad descent. The accessory spleen is morphologically and physiologically similar to a normal spleen and is therefore composed of a comparable subset of structures which carry out similar functions.Īccessory spleens arise due to the incomplete fusion of mesenchymal buds during development. The white pulp as a whole is responsible for the production and maturation of WBCs. The marginal zone is filled with antigen-presenting cells. The lymph follicles, on the other hand, are filled with B lymphocytes and are located between the periarteriolar lymphoid sheaths and the marginal zone. The periarteriolar lymphoid sheaths are filled with T lymphocytes and surround the arteriole blood supply. The white pulp consists of three areas including the periarteriolar lymphoid sheaths, lymph follicles, and marginal zone. The white pulp, on the other hand, is more intricately divided than the red pulp. This filtration helps to remove old and damaged red blood cells and destroy foreign microbes such as viruses, bacteria, and fungi. The sinuses create empty spaces which allow blood to flow through and be exposed to WBCs. Red pulp is made of connective tissue helping to form cords and sinuses containing white blood cells (WBCs). Each function is carried out by specialized tissues in the spleen called red pulp and white pulp. The normal spleen is a versatile organ responsible for a variety of functions including filtering blood and producing immunity. An accessory spleen can be distinguished from splenosis since an accessory spleen is functionally and histologically similar to normal splenic tissue, but splenosis is missing key splenic characteristics such as a thick capsule, smooth muscle elements, and a blood supply arising from the splenic artery. The newly embedded ectopic splenic tissue recruits local blood supply and becomes functional splenic tissue. Splenosis arises from trauma which results in a portion of the spleen breaking off and embedding itself somewhere else in the peritoneal cavity. Accessory spleens typically form due to developmental anomalies and are often confused with splenosis which is another form of ectopic splenic tissue. Most accessory spleens are approximately 1 centimeter, but it is not uncommon to find accessory spleens larger than a few centimeters. Furthermore, the size of an accessory spleen can also vary. ![]() Typically, an individual can have anywhere from one to six accessory splenic buds. Accessory spleens are a relatively common phenomenon with an estimated 10% to 30% of the population having one. The use of this sealer may improve the success rate with better prognosis for endodontic treatment outcomes.An accessory spleen, also called a supernumerary spleen, a splenule, or a splenunculus, is a benign and asymptomatic condition in which splenic tissue is found outside the normal spleen. Statistically significant differences have been detected in the sealer penetration test among all sealer groups which may suggested further future analysis using more sensitive testing procedure.Ĭonclusions: The Total fill Bioceamic sealer has better sealing ability in comparison to other types of sealers. Results: the results of the adaptation and push out bond strength tests have shown higher values for the Total Fill Bioceramic sealer in comparison to the other types of sealers within all regions of the tested roots, especially within the apical sections. These samples were examined by stereoscope to measure the root filling adaptation before testing the push-out bond strength. The rest samples (n=10 in each group) were sectioned into 2mm thickness at the same positions from root apex. ![]() Disks were examined by fluorescent microscope to identify the intratubular penetration of the root canal sealers. These samples then were embedded in clear acrylic before sectioning into 0.5 mm disks at 3, 7 and 11 mm from the root apex. ![]() The used sealer in five samples from each group was mixed with 0.1% fluorescein die before obturating the canals with Thermafil. (Total Full Bioceramic, AH Plus, Gutta-flow BIOSEAL and MTAF sealers respectively). Specimens were randomly divided into four groups (A, B, C, and D) (n=15) depending on the sealer type ![]() Material and method: Sixty freshly extracted human lower 1st premolars were collected, drowned, and endodontically filled using different types of sealers. Aim: The purpose of this study was to evaluate the intracanal adaptation, intratubular penetration, and push-out bond strength of Total fill Bioceramic, AH Plus, Gutta-flow BIOSEAL and MTAF sealers.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |