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



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Understanding what is on the DANB NJXDG exam is crucial step in preparing for the exam. You will need to have an understanding of the testing domain (topics covered) to be sure you are studying the correct information.

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DANB NJ Expanded Duties General Exam - Exam Topics Sample Questions

Composites will have greater wear resistance when they have ____________________________. 





Correct Answer:
higher filler content


composite materials, particularly those used in restorative dental practices, typically consist of a resin matrix and a filler component that imparts various physical and aesthetic properties. the resistance to wear of these composite materials is greatly influenced by the content and type of filler used. higher filler content in a composite material generally leads to increased wear resistance.

fillers are usually made of glass, ceramic, or silica and are added to the composite to improve its mechanical properties, including hardness and durability, which directly correlate to wear resistance. these fillers are typically harder than the surrounding resin matrix, and thus they can take more load and resist abrasion and erosion better. when the composite has a higher percentage of these hard particles, it can better withstand the mechanical stresses that occur during mastication or grinding movements.

additionally, the filler particles also influence the composite’s resistance to fracturing and its ability to maintain surface integrity under stress. with a higher filler content, the load is more effectively distributed across the composite, reducing the stress on any single point, which diminishes the rate of wear over time.

in summary, composites with higher filler content are preferred for areas subjected to intense wear, such as the occlusal surfaces of teeth, because they offer better long-term durability and maintain functionality under repetitive stress. this is a crucial consideration in the formulation of dental composites, aiming to achieve the optimal balance between aesthetic qualities and functional longevity.