Regular dental stones have a low expansion rate, usually between 0.1% and 0.2%, which is suitable for accurate model fabrication.

The primary mode of action of exotoxins is enzymatic, as they often act as enzymes that modify or damage host cell functions.

Dibucaine (cinchocaine) is a highly potent and long-acting local anesthetic with high toxicity. It is often used in topical applications but is avoided for systemic use due to its high risk of adverse effects compared to alternatives like bupivacaine.

In periodontal instrumentation, angulation is crucial for effective scaling and root planing. The angulation refers to the relationship between the face of the instrument's blade and the surface of the tooth being treated. Proper angulation allows for optimal removal of calculus and plaque. The other options refer to different relationships that are not specifically defined as "angulation" in the context of periodontal instruments.

A developer at high temperature will cause a very dark image.