Periodontal Instrumentation and Care Flashcards

Which explorer tip design is MOST effective for detecting subgingival calculus in narrow, deep periodontal pockets?

Answer: ODU 11/12

The ODU 11/12 explorer has a long, angled shank that provides tactile access to subgingival deposits in deep pockets.

Root planing differs from scaling primarily in that root planing:

Answer: Smooths and detoxifies the cementum surface

Root planing aims to create a smooth, biologically compatible root surface by removing embedded toxins and altered cementum.

During periodontal instrumentation, a 'walking stroke' with a probe is used to:

Answer: Systematically assess the full circumference of the pocket depth

The walking stroke moves the probe apically then advances 1–2 mm around the tooth to map the entire sulcus floor.

The 'toe-third' of a curette blade should be adapted against the tooth surface to avoid tissue trauma. How much of the blade should contact the tooth?

Answer: The terminal 1–2 mm (toe-third)

Adapting only the toe-third of the curette ensures the sharp toe does not lacerate adjacent soft tissue.

Which condition is an absolute contraindication to the use of ultrasonic instrumentation?

Answer: Presence of a first-generation demand-type cardiac pacemaker

First-generation demand-type pacemakers can be disrupted by the electromagnetic field of magnetostrictive ultrasonic scalers.

What is the primary purpose of the terminal shank angle on area-specific Gracey curettes?

Answer: To allow adaptation to specific tooth surfaces and angles

The offset and angled terminal shank of Gracey curettes is engineered so the lower blade adapts precisely to specific tooth surfaces.

After non-surgical periodontal therapy, the recommended re-evaluation interval before assessing treatment outcomes is typically:

Answer: 4–6 weeks

A 4–6 week re-evaluation allows tissue healing and response to debridement to be accurately assessed.