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DANB's ORXO (ORXO) Practice Tests & Test Prep by Exam Edge - Review



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DANB's Oregon Expended Functions - Orthodontic Assisting - Reviews


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Based on 170 reviews

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"I found the practice tests extremely helpful. I passed the DANB RHS exam and felt that the subject matter was thoroughly covered by your practice tests. The viewing of films and answering questions on them was especially helpful. Thank you very much for the assistance in preparing for the DANB RHS exam."

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See why our users from 154 countries love us for their exam prep! Including 170 reviews for the DANB's ORXO exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

   Excellent -- Based on 170 reviews

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DANB's Oregon Expended Functions - Orthodontic Assisting - Test Reviews Sample Questions

Your dental office purchases a brand named dental cement, which is used as a temporary restoration filling material. The material purchased is a light curing form. Which of the following results may occur when using a light cured material?

Correct Answer:
the material hardens when it is exposed to a curing light


light-cured dental materials, such as the dental cement mentioned, are designed to remain pliable and moldable until they are exposed to a specific type of light, usually within the blue light spectrum. this characteristic allows dentists to precisely position and sculpt the material before setting it permanently in place. the light initiates a photochemical reaction in the material, typically activated by photoinitiators such as camphorquinone, which triggers the polymerization of the resin within the cement.

when the dental cement is exposed to the curing light, the light energy is absorbed by the photoinitiators, leading to the formation of free radicals. these radicals start a chain reaction that converts the monomers in the resin into a hardened polymer network. this process is known as curing or setting. the result is a hardened material that firmly adheres to the tooth structure, providing a durable and stable restoration.

it is essential to use the correct type of light and exposure time recommended by the manufacturer to ensure complete curing of the material. inadequate light exposure can lead to incomplete curing, which may compromise the strength and durability of the restoration and potentially lead to issues such as sensitivity or secondary caries.

other options mentioned, like the material condensing into a soft cured paste or undergoing oxidation, are not typical of light-cured dental materials. light-cured materials do not just condense; they undergo a chemical transformation that significantly changes their physical properties from a paste to a solid state. similarly, oxidation is not a primary chemical reaction involved in the curing of these dental cements.

therefore, the correct outcome when using light-cured dental cement as described in the scenario is that the material hardens when it is exposed to a curing light. this feature of light-cured materials allows for controlled working times and quick setting times, making them highly suitable for dental restorations where precision and speed are necessary.