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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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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.

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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.

What will happen if the impression material is allowed to stay on the model after the final setting of the stone?





Correct Answer:
the impression material will dry out.


when impression material is left on a dental model (made of stone) after the final setting of the stone, the primary effect observed is that the impression material will dry out. this occurs because most dental impression materials are designed to have a specific moisture content that helps maintain their flexibility and stability. once the material is separated from its original environment and exposed to air for prolonged periods, it starts losing moisture.

the drying out of the impression material can lead to various issues. firstly, the material becomes brittle and less flexible, which increases the risk of it cracking or breaking when removed from the model. this can compromise the accuracy of the mold, which is critical in dental applications where precision is paramount. secondly, changes in the material's properties can lead to distortion in the dimensions of the mold, affecting the fit and function of the final dental prosthetics or devices being fabricated.

to prevent these complications, it is advisable to remove the impression material from the model as soon as it has fulfilled its purpose of creating a mold. ensuring that the material does not remain on the stone model for an extended period helps preserve the quality and integrity of both the impression material and the final stone model. this careful handling is crucial for achieving optimal results in dental restorations or device fabrications, where every detail matters.