*2025* dental assistant licensure exam study questions And Answers

Is an impression negative or positive reproduction? - ANS An impression is a negative reproduction. Of the three classifications of impressions, which one can the expanded-functions dental assistant legally take? - ANS The dental assistant can take a preliminary impression (alginate). 3. Which of the three classifications of impressions is used for occlusal relationship? - ANS The bite registration is used for occlusal relationship. 5. Which type of tray allows impression material to lock on mechanically? - ANS A perforated tray 6. What is used to extend the length of a tray? - ANS Utility wax What is the organic substance of hydrocolloid materials? - ANS The organic substance of hydrocolloid is seaweed. Why would you select a fast-set alginate over a normal-set alginate? You would select a fast-set if the patient had a strong gag reflex. - ANS if the patient had a strong gag reflex. What is the water-to-powder ratio for taking a maxillary impression? - ANS 3 measures of powder to 3 measures of water. What does the prefix hydro- mean? - ANS water What is another name for irreversible hydrocolloid? Another name of irreversible hydrocolloid is alginate. - ANS alginate. Do you mix irreversible hydrocolloid on a paper pad or in a mixing bowl? - ANS It is mixed in a mixing bowl. What material is most often used for a bite registration? Baseplate wax ( either pink sheets or yellow wax bites) is most often used for a bite registration. - ANS Baseplate wax ( either pink sheets or yellow wax bites) is most often used for a bite registration. 14. What type of tray is used when using ZOE bite registration pate? - ANS A gauze bite tray Do you cool or warm the wax before placing the tray in the patient's mouth for a bite registration? - ANS You warm the wax What is the purpose of dental sealants? - ANS prevent dental caries in the pits and fissure areas. Why are pits and fissures susceptible to caries? - ANS because bacteria cannot be removed from these areas. Should sealants be the only preventive measure used? - ANS Sealants should be used as part of a comprehensive preventive program. What are the two types of polymerization? - ANS light -cured and self-cured. Why is clear sealant material less desirable? - ANS Because it is difficult to see during placements and recalls. Is there a difference in retention rates between filled and unfilled sealants? - ANS There is no difference in retention rates between filled and unfilled sealants. What is the reason for putting fluoride in dental sealant material? - ANS In case the sealant is lost, it is thought that the fluoride will have already strengthened the base of the pit or fissure. What is the range of shelf-life of sealant materials? - ANS between 18 and 36 months. What are two patient safety precautions to keep in mind when using sealants? - ANS Keeping etchant off the soft tissue and patient eyewear What determines the effectiveness of dental sealants? - ANS Retention of the dental sealant What is the function of a periodontal surgical dressing? - ANS It protects the surgical site similar to a bandage. What are the most common materials used for periodontal dressings? - ANS zinc oxide-eugenol dressings and non-eugenol dressings. What are the reasons for not using aspirin for pain relief? - ANS Aspirin can interfere with blood-clotting mechanism What are the effects of tobacco use after the periodontal surgery? - ANS Heat and smoke irritate the gingival and delay healing. What are the reasons for using a saline solution rinse? - ANS itcleanses and aids in healing. Which ingredient in a periodontal dressing might a patient be allergic to? - ANS Eugenol products. These may cause blisters on the tissue. What are the three categories of periodontal dressing materials? - ANS *Eugenol - available ready-mix or paste-paste preparations *Non-eugenol chemically cured)-available ready mix- or paste-pasteLight-cured (paste-gel preparations) - supplied in a syringe form Which type of periodontal dressing material can be mixed ahead of time? - ANS Eugenol powder and liquid. How long does the periodontal dressing remain in place? - ANS 7 to 10 days. What are the three instruments that can be used for removal? - ANS U15 scaler, Plastic filling instrument, Spoon excavator-(Dental floss may be used to remove interproximal pieces) List three functions of sutures - ANS a.Close wounds and secure graft positions b.Assist in maintaining hemostasisc.Reduce post-treatment discomfort d.Promote primary intention healing e.Prevent underlying bone exposure f.Protect healing surgical wound from foreign debris and trauma What are the two materials that are used to make sutures? - ANS a.Natural - capable of causing adverse tissue reactionb.Synthetic - developed to reduce tissue reactions List the two different types of non-absorbable sutures. - ANS a.Natural - silkb.Synthetic - non-absorbable - nylon