Answer: MCQs in dentistry

Here are the answers and explanations for the MCQs:

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1. What is the primary purpose of dental prophylaxis?

   **Answer: c) Preventive dental cleaning**

   Explanation: Dental prophylaxis refers to the professional cleaning of teeth to remove dental plaque, calculus, and stains. It is a preventive measure aimed at maintaining oral health and preventing oral diseases such as cavities and gum disease.

2. Which of the following oral conditions is primarily caused by bacterial plaque accumulation?

   **Answer: a) Dental caries (cavities)**

   Explanation: Dental caries, commonly known as cavities or tooth decay, is primarily caused by the accumulation of bacterial plaque on the tooth surfaces. The bacteria in plaque produce acids that demineralize tooth enamel, leading to the formation of cavities.

3. What is the recommended technique for brushing a patient's teeth with gingival recession?

   **Answer: d) Modified Bass technique**

   Explanation: The Modified Bass technique involves angling the toothbrush towards the gumline at a 45-degree angle and making small circular or vibrating motions. This technique is recommended for patients with gingival recession as it helps clean both the teeth and the gumline effectively.

4. Which dental instrument is commonly used for removing calculus deposits from the crowns of teeth?

   **Answer: c) Scaler**

   Explanation: A scaler is a dental instrument specifically designed for removing calculus deposits from the crowns of teeth. It has a pointed tip that can be used to gently remove hardened plaque (calculus) from the tooth surfaces.

5. Which of the following is a risk factor for developing periodontal disease?

   **Answer: b) Overbrushing with a hard-bristle toothbrush**

   Explanation: Overbrushing with a hard-bristle toothbrush can lead to trauma to the gums and enamel, potentially contributing to the development of periodontal disease. It's important to use a soft-bristle toothbrush and practice proper brushing techniques to avoid damaging the oral tissues.

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Please note that these explanations are provided for educational purposes and should not replace professional dental advice. Doctors, Dentists, Dental hygienists, medical students and health assistants should always follow established guidelines and protocols in their practice.