4,833+ quick-fire dental facts • tap a card to flip
Tapping of the bone is performed in dense bone (Type 1 or 2) to create threads that match the implant. This reduces insertion torque and prevents bone necrosis. In softer bone, implants are typically self-tapping.
In dental implantology, tapping of the bone is typically performed in which of the following clinical situations?
1. Dense bone
2. Resorbed bone
3. Osteoporotic bone
4. Demineralized bone
Uric acid is a purine derivative, increased by purine salvage reactions that convert purines, purine ribonucleosides, and purine deoxyribonucleoside to mononucleotides (incorrect answer 4).
Such salvage reactions require much less energy than de novo synthesis (incorrect answers 1, 2). The liver is the major site of purine nucleotide biosynthesis and provides excess purines for other tissues that cannot synthesize purines.
A defect in hypoxanthine-guanine phosphoribosyl transferase, one of the enzymes of purine salvage, is responsible for purine overproduction and subsequent hyperuricemia observed in Lesch-Nyhan syndrome.
Hyperuricemia in Lesch-Nyhan syndrome is due to a defect in which of the following pathways?
1) Purine biosynthesis
2) Pyrimidine biosynthesis
3) Purine salvage
4) Pyrimidine salvage
"V" shaped bone loss is seen in
1. Trauma from occlusion
2. Simple periodontitis
3. Orthodontic tooth movements
4. All of the above
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NEET MDS