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Mandible lever mechanics: Class III lever: Tensile forces at upper surface, compressive forces at lower border. Finite element analysis: Bite force anterior/posterior to fracture → compressive forces at superior border. Lag screw fixation: Provides highest rigidity (2000 – 4000 N compressive force). Titanium plates: Least deflection under MRI; heat production is a concern. Stress shielding: Metallic plates cause atrophi…
Cardiac arrhythmia Cardiac arrhythmia is a group of conditions in which muscle contraction of the heart is irregular for any reason. Tachycardia :A rhythm of the heart at a rate of more than 100 beats/minute , palpitation present Causes : stress, caffeine, alcohol, hyperthyroidism or drugs Bradycardia : slow rhythm of the heart at a rate less than 60 beats/min Atrial Arrhythmias - Atrial fibrillation Atrial Dysrhythmias - Prem…
Wire Size Slot Size Play (Degrees) 21.5 x 28 0.022 " 2° 21 x 25 0.022 " 4° 19 x 25 0.022 " 10°
Hypoxia Hypoxia is tissue oxygen deficiency Brain is the most sensitive tissue to hypoxia: complete lack of oxygen can cause unconsciousness in 15 sec and irreversible damage within 2 min. Oxygen delivery and use can be interrupted at several sites Type of Hypoxia O2 Uptake in Lungs Hemoglobin Circulation Tissue O2 Utilization H…
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