77194

Bis-GMA undergoes a free radical addition polymerization reaction with a shrinkage of about 1-2%, forming a highly rigid cross-linked setting material.

84755

Resin cements have the lowest solubility in the oral cavity due to their hydrophobic nature and polymerization process, which makes them highly resistant to water sorption and dissolution.

67256

Craters in the facial and lingual interdental bone are typically associated with periodontal disease and result from the loss of bone due to inflammation and infection. Osseous regeneration procedures, such as guided bone regeneration (GBR) or the use of bone grafts, are specifically designed to restore lost bone structure. These procedures promote the growth of new bone in the affected areas, effectively filling in the craters and restoring the contour of the alveolar ridge. Gingivectomy and curettage are more focused on soft tissue management and do not address the underlying bone loss, while osseous recontouring may not be as effective in restoring lost bone volume.

55866

The ideal dowel length should be 2/3 the length of the root to provide adequate retention while maintaining at least 4-5mm of apical seal. This provides optimal mechanical retention without compromising the apical seal.

98204

When estrogen levels cross a certain threshold during the menstrual cycle, it triggers ovulation by stimulating the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH).

73891

Calcium is absorbed mainly in the duodenum and jejunum by an active transport mechanism regulated by 1,25 (OH)2 D3 (calcitriol). It is transported across the brush border of intestinal epithelial cells via TRPV6 channels and binds to calbindin. The absorbed calcium is then delivered to the basolateral membrane by calbindin, and from there it is transported into the bloodstream by either the sodium-calcium exchanger (NCX) or calcium-dependent ATPase.

69190

Fins or spines may be produced on a casting because of 1.cracks in the investment 2. too rapid heating of the mold 3. steam production which causes the walls of the mold to flake off

87851

Splenomegaly is not usually seen in sickle cell anemia; instead, autosplenectomy often occurs due to repeated splenic infarctions.

64601

18746

Ideal requisites of a barrier membrane include cell occlusivity, tissue compatibility, and space making.