NEET MDS Shorts
20637
EndodonticsThe primary cause of weakening in an endodontically treated tooth is the loss of sound tooth structure during the access cavity preparation and subsequent canal instrumentation. The extent of this preparation, particularly the removal of marginal ridges and cusps, significantly compromises the tooth's structural integrity.
96455
EndodonticsAn ideal root canal sealer should have all the mentioned properties: 1) Fills the space between cone and canal walls - primary mechanical function, 2) Should have antibiotic properties - to eliminate residual bacteria and prevent reinfection, 3) Should be biologically acceptable - biocompatible with periapical tissues, non-toxic, and non-irritating, 4) Additional ideal properties include: dimensional stability, easy mixing and placement, radiopacity, and easy removal if retreatment needed. No current sealer meets all ideal requirements completely, but these remain the goals for sealer development.
50802
Dental Materials
The ?2 phase is the least corrosion-resistant phase in high-copper amalgams.
35209
Physiology
The rate of gastric emptying is influenced by the presence of food in the stomach, the type of food (carbohydrates, proteins, and fats), the distension of the duodenum, and the hormone gastrin, which can increase the rate of emptying.
95658
NEETMDS
Focal segmental glomerulonephritis (FSGS) is the most common primary cause of nephrotic syndrome in adults, while minimal change disease is the most common cause in children.
74067
Physiology
The sympathetic nervous system primarily uses norepinephrine (also known as noradrenaline) as its neurotransmitter. It is released from the synaptic terminals of postganglionic sympathetic fibers and acts on adrenergic receptors, which are found on various target cells throughout the body. This neurotransmitter is essential for the body's "fight or flight" response, contributing to increased heart rate, dilated pupils, and other physiological changes associated with stress or emergency situations.
72056
PhysiologyThe acrosome in sperm contains enzymes that help in the penetration of the ovum during fertilization, facilitating the fusion of sperm and egg.
84974
ProsthodonticsExplanation: The combination of acrylic resin posterior teeth and porcelain anterior teeth can lead to differential wear and stress concentrations, which may cause resorption of the anterior residual ridge. Porcelain teeth are harder and can create more stress on the underlying bone compared to acrylic teeth, leading to potential resorption. Therefore, option 2 is the correct answer, as it highlights the negative impact on the anterior ridge.
19901
ProsthodonticsDecreased vertical dimension of occlusion results in all of the following except an increase in masticatory efficiency.
41711
PhysiologyThe corpus luteum secretes estrogen and progesterone during the second half of the menstrual cycle, which are essential for maintaining the uterine lining.