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DANB's MDO (MDG) Practice Tests & Test Prep by Exam Edge - Topics

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Understanding what is on the DANB's MDO 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.

  • Directs your study efforts toward the most relevant areas.
  • Ensures efficient and adequate preparation.
  • Helps identify strengths and weaknesses.
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  • Increases the likelihood of success.
  • Keeps you informed about your field's current demands and standards.
There is no doubt that this is a strategic step in achieving certification and advancing your career.

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DANB's Maryland Orthodontic Assisting Expanded Functions - Exam Topics Sample Questions

Which of the following functions of the skeletal muscle’s organs impacts body movement?

Correct Answer:
isotonic contractions
to answer the question about which function of skeletal muscles impacts body movement, we must consider the types of muscle contractions and how they contribute to motion.

isotonic contractions are the correct answer because they directly facilitate body movement by allowing muscles to change length during contraction, maintaining constant tension. there are two main types of isotonic contractions: concentric and eccentric. during concentric contractions, the muscle fibers shorten as they contract. this type of contraction is typically associated with lifting or pulling actions, where the muscle shortens as it exerts force against a load. for example, when you perform a bicep curl, the biceps muscle shortens as you lift the weight towards your shoulder.

on the other hand, eccentric contractions occur when the muscle fibers lengthen while still producing force. this usually happens during controlled lowering movements. for instance, when you lower the same weight during a bicep curl, your biceps are engaging in an eccentric contraction. although the muscle is lengthening, it is still actively controlling the motion against gravity. eccentric contractions are crucial for movements that require controlled slowing or resisting forces, such as walking down a hill or lowering a heavy object.

isometric contractions, while also important in the overall function of muscles, do not contribute directly to body movement in terms of changing the position of the limbs. in isometric contractions, the muscles develop tension while remaining at a constant length. this type of contraction is crucial for maintaining posture or stabilizing joints but does not result in actual movement of body parts relative to each other.

therefore, isotonic contractions are fundamental for most dynamic physical activities, including walking, running, lifting, and throwing. by facilitating the shortening and lengthening of muscles, isotonic contractions allow the body to move and adapt to loads efficiently and effectively.

This device is used to remove some of the enamel from the spaces between the teeth:

Correct Answer:
interproximal stripper.

the device in question is an interproximal stripper, which is specifically designed for dental use, particularly in orthodontic treatments. this tool plays a crucial role in modifying the amount of space between teeth, a process often necessary to ensure proper alignment and fit of orthodontic appliances.

interproximal strippers are used to remove a small amount of enamel from the sides of the teeth that face each other (the interproximal space). this procedure, known as interproximal reduction or reproximation, is critical when there is a need to create additional space to correct overcrowding, or to achieve better contact between teeth. by carefully removing enamel, orthodontists can help teeth to fit together more comfortably and functionally, which is essential for both the effectiveness of the orthodontic treatment and the long-term health of the teeth.

the use of interproximal strippers must be carefully planned and executed by a professional. the process involves the use of a series of graded abrasive strips or diamond-coated instruments that selectively remove enamel. this is done incrementally and with great precision to avoid damaging the teeth or removing more enamel than necessary.

in contrast, other devices listed such as scalers, explorers, and dividers serve different purposes in dentistry. for instance, scalers are primarily used for removing tartar and plaque from the teeth surfaces, particularly along the gum line. explorers are diagnostic tools used to detect cavities, calculus, or other anomalies on the surfaces of the teeth. dividers, on the other hand, are used in various measuring tasks in dental procedures but are not involved in enamel removal.

therefore, for the specific task of enamel removal between teeth, the correct answer is interproximal strippers. this explanation emphasizes their importance in orthodontic treatments and distinguishes their function from other dental instruments, highlighting their unique role in dental care and maintenance.