Australian Dental Council (ADC) Practice Test 2026 - Free ADC Practice Questions and Study Guide

The prolonged immersion of cobalt chrome partial dentures in hypochlorite solutions is not advisable due to the potential for corrosion. Cobalt chrome is a metal alloy commonly used in dental prosthetics, and hypochlorite solutions, particularly sodium hypochlorite, can aggressively react with and degrade the metal surface over time. This reaction compromises the integrity of the denture, leading to reduced mechanical strength and potentially significant changes in the appearance and longevity of the restoration.

In contrast, other choices, such as alkaline peroxidase, soap solutions, and water, are generally safer for cleaning and disinfecting cobalt chrome dentures. Alkaline peroxidase and soap solutions can effectively remove debris and microbial contamination without presenting a significant risk of corrosive damage. Water is also safe for rinsing and short-term soaking, as it does not chemically react with cobalt chrome.

The key takeaway is that while some cleaning agents are effective for maintaining dental appliances, the chemical composition of hypochlorite solutions renders them unsuitable for prolonged contact with cobalt chrome, highlighting the need for careful selection of cleaning agents in dental practice.