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B. Which of the following is not true about rotary cutting instruments? A) The rotary movement should always start or stop before the contact with tooth structure. B)/ Both low-speed and high-speed handpieces must be sterilized in the autoclave for the control of cross contamination. c) Both low-speed and high-speed handpieces must be lubricated before and after the process of sterilization. D) Both low-speed and high-speed handpieces must be used on an intermittent way and under refrigeration with an air/water spray to avoid tissue overheating. E) Excess lubricating oil should not be removed before the tool is used. - Initial cavity preparation. - Extension of preparation. - Preparation of retention grooves. - Removal of caries. 10. Which of the following is the bur whose usage areas are given above? A) Straight fissure B) Round C) Tapered fissure

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B. Which of the following is not true about rotary cutting instruments? A) The rotary movement should always start or stop before the contact with tooth structure. B)/ Both low-speed and high-speed handpieces must be sterilized in the autoclave for the control of cross contamination. c) Both low-speed and high-speed handpieces must be lubricated before and after the process of sterilization. D) Both low-speed and high-speed handpieces must be used on an intermittent way and under refrigeration with an air/water spray to avoid tissue overheating. E) Excess lubricating oil should not be removed before the tool is used. - Initial cavity preparation. - Extension of preparation. - Preparation of retention grooves. - Removal of caries. 10. Which of the following is the bur whose usage areas are given above? A) Straight fissure B) Round C) Tapered fissure

B. Which of the following is not true about rotary cutting instruments? A) The rotary movement should always start or stop before the contact with tooth structure. B)/ Both low-speed and high-speed handpieces must be sterilized in the autoclave for the control of cross contamination. c) Both low-speed and high-speed handpieces must be lubricated before and after the process of sterilization. D) Both low-speed and high-speed handpieces must be used on an intermittent way and under refrigeration with an air/water spray to avoid tissue overheating. E) Excess lubricating oil should not be removed before the tool is used. - Initial cavity preparation. - Extension of preparation. - Preparation of retention grooves. - Removal of caries. 10. Which of the following is the bur whose usage areas are given above? A) Straight fissure B) Round C) Tapered fissure

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B. The statement that is not true about rotary cutting instruments is:<br /><br />D) Both low-speed and high-speed handpieces must be used on an intermittent way and under refrigeration with an air/water spray to avoid tissue overheating.<br /><br />This statement is not true because low-speed and high-speed handpieces are typically used continuously during dental procedures and do not require intermittent use or refrigeration with an air/water spray to avoid tissue overheating.<br /><br />10. The bur whose usage areas are given above is:<br /><br />C) Tapered fissure<br /><br />Tapered fissure burs are commonly used for initial cavity preparation, extension of preparation, preparation of retention grooves, and removal of caries.
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