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The ideal angle for holding an instrument during dental procedures is approximately 20-30 degrees. This angle provides a balance between control and visibility when working within the confined space of the oral cavity. Holding the instrument at this angle allows the dental professional to maintain dexterity and precision while maneuvering the tool effectively to access various areas in the mouth.

In contrast, a 90-degree angle may be too vertical, making it difficult to navigate around teeth and soft tissues. A 180-degree angle is impractical as it would not facilitate proper handling of the instrument or access to the treatment area. Similarly, a 45-degree angle might be too steep, reducing the ability to operate the tool efficiently. Thus, the 20-30 degree angle strikes the right balance for optimal performance during dental procedures.