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


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DANB's Certified Restorative Functions Dental Assistant - Reviews


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See why our users from 154 countries love us for their exam prep! Including 200 reviews for the DANB's CRFDA 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 Certified Restorative Functions Dental Assistant - Test Reviews Sample Questions

A patient wants to know if the etchant will make their child's teeth softer. The BEST response is:





Correct Answer:
etchant only conditions the tooth surface and will not make the teeth soft.


when addressing concerns about whether using an etchant will make a child's teeth softer, it's crucial to understand the function and impact of etchant on dental surfaces. the best response to this concern is: "etchant only conditions the tooth surface and will not make the teeth soft."

etchants are commonly used in dentistry to prepare the tooth surface for procedures like bonding or sealant application. the primary component of most dental etchants is phosphoric acid. the role of the etchant is to microscopically roughen the enamel surface by removing the smallest outer layer. this roughening enhances the adhesion of materials like composite resins or sealants to the tooth.

it’s important to clarify that the etchant acts only on the outermost layer of the enamel and does not penetrate deep into the tooth structure, such as the dentin, which is the layer beneath the enamel. the action of etching is very controlled and superficial, ensuring that the integrity and hardness of the tooth remain intact. therefore, the etchant does not weaken or soften the teeth.

moreover, after the etchant has been applied and washed off, a sealant or bonding agent is usually applied. these materials serve to protect the tooth. in the case of sealants, they form a hard barrier over the etched enamel, which not only protects the enamel from decay but also reinforces the tooth’s surface against wear and tear. thus, rather than softening the teeth, the process involving the etchant and subsequent application of sealants or bonding agents actually contributes to the overall strength and protection of the teeth.

in summary, the use of etchant in dental treatments is a standard and safe practice designed to improve the effectiveness of dental sealants and other bonding procedures without compromising the hardness or health of the teeth. thus, parents can feel reassured that etchants are used to enhance dental treatment outcomes while maintaining the structural integrity of their child's teeth.

Out of the types of zinc oxide eugenol cements, which of the following is less irritating to the tissues in the oral cavity?





Correct Answer:
type ii zinc oxide-eugenol


type ii zinc oxide-eugenol cement is known for its less irritating properties compared to other dental cements. this makes it a preferred choice in dental procedures that involve direct contact with the sensitive tissues within the oral cavity. the properties that contribute to its reduced irritability include its chemical composition and the ph level it maintains.

zinc oxide-eugenol cements are composed of zinc oxide powder and eugenol, which is a phenolic compound derived from oil of cloves. the eugenol component has been noted for its soothing properties and ability to reduce pain and irritation. type ii zinc oxide-eugenol specifically, has a balanced formulation that not only provides mechanical strength suitable for supporting dental appliances and cast restorations but also maintains a neutral ph level close to 7.0 when set.

the ph level of a dental cement is crucial because materials with lower ph levels (more acidic) can lead to irritation and damage to the oral tissues. since type ii zinc oxide-eugenol maintains a neutral ph, it is less likely to cause irritation compared to more acidic alternatives. this neutral ph helps preserve the health of the pulp and surrounding tissues, making type ii zinc oxide-eugenol an ideal choice for applications near sensitive areas.

additionally, type ii zinc oxide-eugenol is designed to have a slower setting time and lower exothermic reaction during the setting process, which further reduces the risk of thermal irritation to the tissues. this property is particularly important when working close to the pulp or in regions of the mouth where the mucosa is thin and sensitive.

in conclusion, type ii zinc oxide-eugenol is favored in dentistry for its properties that minimize irritation, including a neutral ph level, inherent soothing effects of eugenol, appropriate mechanical strength, and controlled setting characteristics. this makes it a safe and effective choice for use in various dental restorative procedures, particularly when patient comfort and tissue health are primary concerns.


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