83330

Hydrogen peroxide is the solution used to bleach non-vital endodontically treated teeth. Typically used as: 1) 30% hydrogen peroxide (Superoxol) for in-office bleaching, 2) Can be activated with heat for enhanced effectiveness, 3) May be mixed with sodium perborate for walking bleach technique, 4) Penetrates dentin tubules to break down chromophores causing discoloration. Chloroform and ether are solvents used for gutta-percha removal, while sodium hypochlorite is an irrigant for canal disinfection, not bleaching.

28143

The possibility that a distal step would become class II is very real, and this not self correcting problem. When the central incisors erupt, these teeth use up essentially all of the excess space in the normal primary dentition. With the eruption of the lateral incisors, space becomes tight in both arches.

Normal child will go through a transitory stage of mandibular incisor crowding at age 8 to 9 even if there will eventually be enough room to accommodate all the permanent teeth in good alignment. In other words, a period when the mandibular incisors are slightly crowded is a normal developmental stage.

44729

Fexofenadine is the active metabolite of terfenadine that does not block delayed rectifier K channels in the heart and does not prolong QTc interval. It is free of arrhythmogenic potential, does not cross the blood-brain barrier, and does not produce sedation. It has a plasma half-life of 11-16 hrs and duration of action 24 hrs.

43095

The middle piece of the sperm cell is where the fibrous sheath is surrounded by spirally arranged mitochondria, which are the cell's powerhouses. They provide the energy required for the flagellum's movement during sperm motility.

26102

Troponin T is elevated in myocardial infarction. Troponins are cardiac-specific proteins released during myocardial necrosis. They are highly sensitive and specific markers for myocardial damage, remaining elevated for 7-14 days after MI, making them ideal for diagnosis.

21285

Flexibility of an orthodontic wire is directly proportional to its length and the interbracket distance. Flexibility is inversely proportional to the cross-section diameter/area. Bracket prescription refers to the angles built into the brackets themselves and does not directly influence the inherent flexibility of the wire material.

77341

Electrosurgery uses controlled high-frequency electrical current in the range of 1.5-7.5 million cycles/second.

97603

Facial paralysis with drooping of the mouth and excess lacrimation is characteristic of Bell's palsy.

22984

17242

Adrenaline is the drug of choice in anaphylactic shock as it acts rapidly to counteract the effects of histamine by causing vasoconstriction and bronchodilation. It is administered intramuscularly to ensure quick absorption and action.