Final answer:
To detect calculus deposits on the proximal surfaces of posterior teeth, the ODU 11/12 explorer with a light, flowing stroke is recommended for effective and sensitive exploration.
Step-by-step explanation:
To determine if a client has calculus deposits on the proximal surfaces of the posterior teeth, the instrument of choice would be the ODU 11/12 explorer, and the instrumentation stroke used would be a light, flowing stroke. The ODU 11/12 explorer is specifically designed for detecting subgingival and supragingival calculus in the posterior regions. Such an explorer is thin enough to fit into tight interproximal spaces and has a flexible, wire-like working end that allows for tactile sensitivity.
A light, flowing stroke is the correct technique as it allows for gentle exploration of the tooth surface without exerting an excessive force that could damage the tissue or the explorer. This kind of stroke is essential for identifying the texture differences between tooth structure and calculus deposits. As the explorer moves over the surface of the tooth, calculus will feel rough and can disrupt the smooth flow of the instrument, while a smooth tooth surface will not disrupt the stroke.