98103

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.

94732

Acetaminophen primarily acts centrally as an analgesic without significant peripheral COX inhibition or impact on prostaglandins, so it doesn't alter bone deposition/remodeling. Ibuprofen, Aspirin, and Dexamethasone all interfere with the bone remodeling process. 

Ibuprofen (an NSAID) inhibits cyclooxygenase (COX) enzymes, reducing prostaglandin E2 production, which slows osteoclast activity and tooth movement (supported by studies like those in American Journal of Orthodontics and Dentofacial Orthopedics, e.g., 2010 review showing NSAIDs delay movement by 30-50%).

Aspirin (another NSAID) similarly inhibits COX, decreasing prostaglandins and impairing bone remodeling, as evidenced by clinical trials (e.g., Angle Orthodontist 2006 study demonstrating reduced tooth movement).

Dexamethasone (a corticosteroid) suppresses osteoblast and osteoclast function via glucocorticoid receptors, inhibiting bone formation and remodeling (confirmed by research in Journal of Dental Research, e.g., 2015 studies showing steroids impair orthodontic response).

53662

The purpose of guided tissue regeneration is to prevent epithelial migration.

25048

Easy fatigability of muscles is characteristic of myasthenia gravis, an autoimmune disorder affecting neuromuscular transmission. Patients experience progressive muscle weakness with repetitive use that improves with rest. Epilepsy involves seizure activity, MPDS involves muscle pain and spasm, and cerebral palsy involves spasticity, but none of these conditions primarily feature muscle fatigability.

18958

Multiple radiolucencies are common in all of the following except osteopetrosis.

35892

Facilitated diffusion is a type of passive transport, meaning it does not require energy (ATP). It involves the movement of substances down their concentration gradient with the help of specific carrier proteins or channel proteins embedded in the cell membrane.
Creatine phosphate is involved in providing energy for muscle contraction, not facilitated diffusion.

29740

When extracting an upper first bicuspid, the buccal root is typically in close proximity to the buccal cortical plate. Due to the thinness of this bone, a fractured root tip is most likely displaced into the adjacent buccal soft tissue. The maxillary sinus is a possibility for upper molars or second bicuspids, but less common for the first bicuspid's buccal root.

68154

The chamfer finish line has the highest risk of leaving unsupported enamel because it creates a curved transition that may leave thin, fragile enamel edges. The shoulder provides definite support, the shoulder with bevel adds strength, while the bevel alone provides gradual transition. The chamfer's curved nature can result in inadequate support for thin enamel margins.

51952

The periodontal ligament contains immature elastic fibers (oxytalan fibers), but mature elastic fibers are not typically present.