NEET MDS Shorts
64591
Oral Medicine
Neurofibromatosis type 1 is an autosomal dominant disorder caused by a mutation in the NF1 gene, which produces neurofibromin. The gene is located on chromosome 17.
16857
PeriodonticsThe Gracey curette is a dental instrument used for subgingival scaling and root planing. Correct adaptation of the curette involves placing it at the correct angle to the tooth surface to effectively remove plaque and calculus. The lower shank of the curette should be parallel with the tooth surface to allow for proper engagement with the tooth structure.
74806
Anatomy
The spleen follows the long axes of ribs 9 to 11 and lies mostly posterior to the stomach, above the colon, and partly anterior to the kidney. It is attached to the stomach by a broad mesenterial band, the gastrosplemic ligament. Therefore, it is the most likely organ of the group to be pierced by a sharp object penetrating just above rib 10 at the posterior axillary line. Note that the pleural cavity, and possibly the lower part of the inferior lobe of the lung, would be pierced before the spleen. The ascending colon (choice 1) is on the wrong side (the right) to be penetrated by a sharp instrument piercing the left side. Most of the duodenum (choice 2) is positioned too far to the right to be affected by this injury. Even the third part of the duodenum, which runs from right to left, would still be out of harm's way. In addition, the duodenum lies at about levels L1 to L3, placing it too low to be injured in this case. The superior pole of the left kidney (choice 3) is bordered by the lower part of the spleen. However, it is crossed by rib 12 and usually does not extend above rib 11. It would probably be too low and medial to be injured in this case because this penetration is at the posterior axillary line.
15323
PeriodonticsA hemiseptum refers to a periodontal defect with only one wall remaining, often seen in sites of periodontal bone loss.
43389
Orthodontics
SOLUTION Mechanical approaches for aligning unerupted teeth. Orthodontic traction to pull an unerupted tooth toward the line of the arch should begin as soon as possible after surgery
Ideally a fixed orthodontic appliance should already be in place before the unerupted tooth is exposed, so that orthodontic force can be applied immediately.
If this is not practical, active orthodontic movement should being no later than 2 or 3 weeks post-surgically.
40055
RadiologyOverexposure of film results in increased density and dark film.
37534
PeriodonticsThe operator position to perform scaling on the mandibular right posterior extent on the lingual aspect is the front position.
78550
General Medicine
Pinhead stippling of the skull is a sign of increased osteoclastic activity, which is characteristic of hyperparathyroidism. It represents resorption of the outer layer of the bone and is most prominent in the calvaria.
87479
PeriodonticsGTR is an example of a non-graft associated regenerative technique.
91658
Dental Materials
Compressive and tensile strengths of spherical alloys are greatest at normal trituration time.