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DANB NJXDG (NJXDG) Practice Tests & Test Prep by Exam Edge - Exam Info



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DANB NJ Expanded Duties General Exam - Additional Information

At ExamEdge.com, we focus on making our clients' career dreams come true by offering world-class practice tests designed to cover the same topics and content areas tested on the actual Dental Assisting National Board DANB NJ Expanded Duties General Exam (NJXDG) Certification Exam. Our comprehensive DANB NJ Expanded Duties General Exam practice tests are designed to mimic the actual exam. You will gain an understanding of the types of questions and information you will encounter when you take your Dental Assisting National Board DANB NJ Expanded Duties General Exam Certification Exam. Our DANB NJ Expanded Duties General Exam Practice Tests allow you to review your answers and identify areas of improvement so you will be fully prepared for the upcoming exam and walk out of the test feeling confident in your results.

Because our practice tests are web-based, there is no software to install and no need to wait for a shipment to arrive to start studying. Your DANB NJ Expanded Duties General Exam practice tests are available to you anytime from anywhere on any device, allowing you to study when it works best for you. There are 5 practice tests available, each with 100 questions and detailed explanations to help you study. Every exam is designed to cover all of the aspects of the DANB NJXDG exam, ensuring you have the knowledge you need to be successful!

DANB NJ Expanded Duties General Exam - Additional Info Sample Questions

Which of the following statements regarding amalgal alloy restorative material is TRUE?

Correct Answer:
tin will improve the physical property of amalgam when mixed with silver. 


to address the question regarding the effects of tin in amalgam alloy restorative materials, it is essential to understand the basic composition and functionality of dental amalgam. dental amalgam is a common material used for filling dental cavities and is composed of a mixture of metals including silver, tin, copper, and sometimes smaller amounts of zinc, indium, or palladium.

amalgam’s physical and chemical properties depend significantly on the proportions and treatment of these constituent metals. in the context of this discussion, the focus is on the role of tin in the amalgam. tin is typically mixed with silver to form the silver-tin alloy phase before mercury is added. this mixing significantly influences the final properties of the dental amalgam.

the first statement under consideration is, "tin will improve the physical property of amalgam when mixed with silver." here, 'physical property' can refer to various attributes like strength, corrosion resistance, and setting characteristics. historically, adding tin to silver in dental amalgam helps control the rate of the setting reaction and influences the amalgam's creep behavior. creep refers to the slow deformation of the amalgam under constant stress, which can affect the longevity and stability of the filling.

however, it is important to note that while tin modifies certain properties when mixed with silver, it does not universally 'improve' all physical properties. for instance, increasing the tin content in an amalgam alloy is known to reduce its strength and increase its setting expansion. setting expansion is the expansion that occurs as the amalgam hardens and sets in place. higher expansion can potentially lead to issues like higher stress on the surrounding tooth structure and marginal breakdown.

therefore, while tin can improve some aspects of the amalgam's performance by modifying its reaction with silver and mercury, it also introduces reductions in other properties such as strength. the statement that "tin increases the strength of an amalgam alloy" is generally incorrect, as the addition of tin, beyond optimal levels, usually results in a decrease in compressive strength.

in summary, the true effects of tin in amalgam alloys are nuanced. while it can enhance certain physical properties like reducing creep, it also diminishes others such as strength and increases setting expansion. the overall formulation and manipulation of the amalgam, including the ratios and treatment of tin, silver, and other metals, are critical in determining the amalgam’s final properties. thus, a statement that broadly claims tin improves physical properties without specifying which properties or under what conditions is overly simplistic and can be misleading.