20406

All of the following features are suggestive of asbestosis except occurs within five years of exposure

52476

Explanation: Thumb sucking is a common behavior in children and does not always lead to maxillary prognathism, psychological disturbances, or the need for appliance therapy. Many children stop thumb sucking on their own without intervention.

55367

• External resorption (vital teeth): The prognosis depends on the type (surface, inflammatory, or replacement resorption). Surface resorption often heals spontaneously if the pulp remains vital and the cause (like trauma) is removed. Inflammatory resorption can be managed if detected early. Replacement resorption (ankylosis) has a poor long-term prognosis. Overall, external resorption in vital teeth can sometimes be controlled, so prognosis is variable but often better than the other two conditions.

• Internal resorption (vital teeth): This usually requires endodontic treatment once detected. If the lesion is small and treated early, prognosis can be favorable. However, untreated internal resorption progresses and weakens the tooth structure, making prognosis worse than external surface resorption.

• Vertical root fracture (vital teeth): This has the worst prognosis. Vertical root fractures are generally considered hopeless because they cannot be predictably repaired. Extraction is usually the treatment of choice.

vital teeth with external resorption generally have the better prognosis compared to internal resorption and vertical root fracture.

45407

The gingival bevel in a class II mesio-occlusal inlay preparation is typically placed at an angle of 30-40 degrees to the gingival wall to provide mechanical retention and seal the margin effectively.

76872

Severe acidosis, particularly metabolic acidosis, can occur following prolonged cardiac arrest and subsequent CPR. The primary goal in managing such cases is to restore normal pH levels in the body, which is crucial for proper cellular function and overall physiological homeostasis.

99390

In renal impairment, the time to reach steady-state plasma concentration generally differs from that in patients with normal renal function due to altered clearance; hence, statement 3 is incorrect.

33003

The nerve to masseter passes through the mandibular notch to enter the muscle on its medial surface

The nerve to the masseter muscle is the masseteric nerve, which is a branch of the mandibular nerve (CN V3), the largest division of the trigeminal nerve (cranial nerve V). The masseter muscle is one of the muscles of mastication that lifts the lower jaw, contributing to the action of biting and chewing.

The masseteric nerve originates from the anterior division of the mandibular nerve and typically passes:

1. Deep to the medial pterygoid muscle: The medial pterygoid muscle is located in the infratemporal fossa, which is the space deep to the zygomatic arch and medial to the temporomandibular joint (TMJ). The masseteric nerve runs in a deep position relative to the medial pterygoid muscle as it travels towards the masseter muscle. This muscle is involved in the side-to-side movement of the jaw, known as lateral excursion.

2. Posterior to the temporomandibular joint: The TMJ is the articulation between the mandible and the temporal bone of the skull. It is a synovial joint that allows for the hinge movement of the jaw, such as opening and closing the mouth. The masseteric nerve passes behind the TMJ to reach the masseter muscle. This nerve does not actually cross the joint itself but runs in a position posterior to it.

3. Superior to the zygomatic arch: The zygomatic arch is the bony structure that extends from the zygomatic process of the temporal bone to the zygomatic bone of the skull. It forms the prominence of the cheek. The masseteric nerve runs superior to the zygomatic arch to reach the masseter muscle. The arch serves as a landmark for the nerve's course, and the nerve typically does not pass through the arch itself.

4. Through the mandibular notch: This statement is not entirely correct. The masseteric nerve does not pass through the mandibular notch, which is a depression on the medial surface of the ramus of the mandible, but rather it passes above (superior to) the notch. The mandibular notch is the location where the masseteric nerve and the other branches of the mandibular nerve leave the infratemporal fossa and enter the submandibular space to innervate the muscles of mastication, including the masseter. The nerve then runs along the lateral surface of the lateral pterygoid plate and enters the deep surface of the masseter muscle.

In summary, the masseteric nerve passes deep to the medial pterygoid muscle, posterior to the TMJ, and superior to the zygomatic arch. It does not pass through the mandibular notch; instead, it runs superior to it before reaching the masseter muscle. The anatomical pathway of this nerve allows it to effectively innervate the masseter muscle, which is crucial for the function of the muscle in mastication.

47037

The mandibular 1st molar is supplied by Inferior alveolar nerve and long Buccal Nerve

51058

Movement disorders, particularly those associated with basal ganglia dysfunction such as dystonia and chorea, are the most common neurological manifestations of Wilson’s disease due to the primary toxic effect on the basal ganglia from copper deposition.

59697

For a class V gold restoration, the mesial and distal cavity margins should end at the line angles of the tooth to ensure proper adaptation and prevent overhangs. This is important for both functional and aesthetic reasons