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The term equiaxed refers to the fact that three dimensions of each grain are similar. In dendritic structure, grains are elongated. Dendritic micro structures are not desirable for cast dental alloys, reason being the inter dendritic regions can serve as sites for
crack propagation.

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The vanillylmandelic acid (VMA) test is a diagnostic tool used to detect tumours that originate from the neural crest, such as neuroblastoma and pheochromocytoma.These tumours produce excess catecholamines (like adrenaline and noradrenaline), which are then broken down into VMA.Elevated levels of VMA in the urine indicate the presence of such tumours..

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Lumbar puncture is done at L3-L4 level. This is below the termination of the spinal cord (conus medullaris at L1-L2) and within the cauda equina region. This level minimizes the risk of spinal cord injury while providing safe access to cerebrospinal fluid.

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The Caldwell-Luc procedure involves accessing the maxillary sinus through the canine fossa. Following this procedure, a nasal antrostomy is created to provide drainage of the sinus into the nasal cavity. This opening is made in the lateral wall of the inferior meatus, which is located beneath the inferior turbinate.

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The penicillin with the best gram negative spectrum is ampicillin

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Pseudohypoparathyroidism is characterized by resistance to parathyroid hormone, leading to low serum calcium levels, not elevated serum calcium.

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For generalized tonic-clonic seizures, phenytoin, carbamazepine, or valproate is the drug of choice. 

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The risk factors for gestational diabetes include advanced maternal age, obesity, previous history of gestational diabetes, family history of diabetes, high blood pressure, and certain ethnic groups (e.g., African American, Hispanic, Native American). Being a non-smoker is not a risk factor for developing gestational diabetes; rather, smoking is generally associated with a lower risk of developing the condition.