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A three-fourth crown is a type of partial veneer crown that covers the mesial, distal, and lingual surfaces of a tooth, while leaving the facial (buccal) surface intact. This design provides a "wrench-like" or three-point grip for retention and stability, particularly on posterior teeth.

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Explanation: When dealing with adjacent Class III cavities, it is generally recommended to prepare the larger cavity first and fill it last. This approach allows the dentist to have better access and visibility when preparing the larger cavity, which can be more complex. Filling the larger cavity last helps to avoid contamination and ensures that the smaller cavity can be filled with precision without compromising the integrity of the larger restoration.

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The cholinergic system, which is part of the parasympathetic nervous system, stimulates the parietal cells in the stomach to release hydrochloric acid (HCL) through the activation of muscarinic M1 receptors. This is crucial for the digestion of food and the maintenance of gastric pH.

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Proper glycemic control is essential for wound healing in diabetic patients. Elevated blood glucose levels impair the immune response and can worsen the ulcer.

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Gamma camera in Nuclear Medicine is used for measuring the radioactivity.

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The main objective of obturation is to fill the canal and prevent apical percolation of fluids. This primary goal involves: 1) Creating a fluid-tight seal at the apical foramen, 2) Preventing bacterial penetration from oral cavity, 3) Eliminating pathways for tissue fluid seepage, 4) Preventing recontamination of treated root canal system. While preventing discoloration and providing support for restoration are secondary benefits, the fundamental purpose is to achieve biological seal that prevents apical periodontitis by eliminating bacterial access to periapical tissues.

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Patient records, including dental X-ray films, are typically the property of the dentist who created them. The dentist is responsible for maintaining, storing, and safeguarding these records according to legal and professional standards. However, patients do have the right to access and obtain copies of their records.

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Selective grinding is a technique used to adjust the occlusion of complete dentures. It is best performed after the dentures have been processed and rearticulated with a new series of jaw relations to ensure that the occlusion is accurate and reflects the patient's current jaw relationship. This allows for more precise adjustments to be made, as the original records may not accurately represent the current occlusal relationship after processing.