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questions with verified solutions
Is an impression negative or positive reproduction? ✔✔An impression is a negative reproduction.
Of the three classifications of impressions, which one can the expanded-functions dental assistant legally take? ✔✔The dental assistant can take a preliminary impression (alginate).
- Which of the three classifications of impressions is used for occlusal relationship? ✔✔The bite registration is used for occlusal relationship.
- Which type of tray allows impression material to lock on mechanically? ✔✔A perforated tray
- What is used to extend the length of a tray? ✔✔Utility wax
What is the organic substance of hydrocolloid materials? ✔✔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. ✔✔if the patient had a strong gag reflex.
What is the water-to-powder ratio for taking a maxillary impression? ✔✔3 measures of powder to 3 measures of water.
What does the prefix hydro- mean? ✔✔water
What is another name for irreversible hydrocolloid? Another name of irreversible hydrocolloid is alginate. ✔✔alginate.
Do you mix irreversible hydrocolloid on a paper pad or in a mixing bowl? ✔✔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. ✔✔Baseplate wax ( either pink sheets or yellow wax bites) is most often used for a bite registration.
- What type of tray is used when using ZOE bite registration pate? ✔✔A gauze bite tray
What is the reason for putting fluoride in dental sealant material? ✔✔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? ✔✔between 18 and 36 months.
What are two patient safety precautions to keep in mind when using sealants? ✔✔Keeping etchant off the soft tissue and patient eyewear
What determines the effectiveness of dental sealants? ✔✔Retention of the dental sealant
What is the function of a periodontal surgical dressing? ✔✔It protects the surgical site similar to a bandage.
What are the most common materials used for periodontal dressings? ✔✔zinc oxide-eugenol dressings and non-eugenol dressings.
What are the reasons for not using aspirin for pain relief? ✔✔Aspirin can interfere with blood- clotting mechanism
What are the effects of tobacco use after the periodontal surgery? ✔✔Heat and smoke irritate the gingival and delay healing.
What are the reasons for using a saline solution rinse? ✔✔itcleanses and aids in healing.
Which ingredient in a periodontal dressing might a patient be allergic to? ✔✔Eugenol products. These may cause blisters on the tissue.
What are the three categories of periodontal dressing materials? ✔✔*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? ✔✔Eugenol powder and liquid.
How long does the periodontal dressing remain in place? ✔✔7 to 10 days.
Is it mandatory for the dental assistant in MN to consult with a dentist prior to suture removal? Explain why or why not. ✔✔Yes. Consult with the dentist prior to suture removal for instructions, especially if there is anything unusual in the healing process or sutures cannot be located.
What is the purpose of placing the sutures on a gauze after the removal process? ✔✔To make sure that all the sutures have been located.
What type of scissors is used for suture removal? ✔✔Curved sharp scissors with a pointed tip (suture scissors)
Define bacteremia. ✔✔Presence of bacteria in the blood
At what location is the suture cut? ✔✔- Under the knot and as close to the tissue as possible
What is a coronal polish? ✔✔A coronal polish is a procedure used to remove stains and plaque.
What is the difference between a coronal polish and an oral prophylaxis? ✔✔An oral prophylaxis is the complete removal of calculus and debris, as well as stain.
What is the purpose of selective polishing? ✔✔Selective polishing means that only the teeth with visible stain are polished.
What is an extrinsic stain? ✔✔A stain that can be removed from the surfaces of the teeth.
What is an intrinsic stain? ✔✔An intrinsic stain occurs within the tooth and cannot be removed by polishing or scaling.
Which is the most common technique for stain removal? ✔✔Rubber cup coronal polishing is the most common technique for stain removal.
Which type of grasp is used to hold the handpiece? ✔✔The pen grasp is used to hold the handpiece.
What is the purpose of a fulcrum? ✔✔The purpose of the fulcrum is to provide stability for the operator.
What piece of equipment stabilizes and stretches the dam away from the tooth? ✔✔The frame stretches and stabilizes the dental dam.
If you are unable to slide the dam interproximaly what could be placed on the underside of the dam to help in the application? ✔✔Water-soluble lubricant can help in dam application.
The hole sizes on the rubber dam punch range from 1 to 5. Which is the smallest size? ✔✔Hole size 1.
For what purpose would you use an anterior dental dam clamp? ✔✔For retraction of the gingival, for class V restorations, and for endodontic treatment.
Identify the types of clamps that are used on premolars? Max molars? Mand molars? ✔✔Premolars - W2 Max Molars - W8 or W3 Mand Molars - W7 or W
Once the clamp is placed on the anchor tooth what is used on the opposite side to secure the dam in place? ✔✔Either a rubber ligature or a floss ligature.
The clamp is normally placed how many teeth distal to the tooth being worked on? ✔✔Two teeth distal.
What are the 3 types of rubberdam frames that could be used? ✔✔Young's Ostby Hygienic
What is the name of the rubberdam piece that is in between the teeth? ✔✔Interseptal rubber or the septum.
Describe the punching when teeth are part of bridgework? ✔✔Punch for each abutment and then slit a hole between them so that the rubberdam can be tucked under the pontic area.
Describe the parts of the clamp. ✔✔Bow, Jaw, Points, Forcep Holes
What is the purpose of inverting the rubberdam? ✔✔Inverting seals the rubberdam around the neck of the tooth for moisture control.
What types of devices/instruments are used to invert the rubberdam? Floss ✔✔Air, Plastic filling instrument
What is the location of the instrument blade just prior to removal of excess cement? ✔✔The tip of the instrument blade is placed under the edge of the cement adjacent to the tooth and the instrument is moved in an occlusal direction
What is the purpose of tying a knot in the dental floss? ✔✔The knot adds extra mass in removing the cement from this space
List one reason why it is imperative to make sure that all excess cement is removed? ✔✔•Remaining cement may lead to gingival irritation • There will be increased plaque development if all the cement is not removed • Remaining cement may be a cause of recurrent caries
What is the first thing that should be done to the area where the excess cement is being removed for evaluation? •After the cement has completed its initial setting ✔✔remove the cotton rolls from the area • Using your explorer, examine the material to ensure the proper set •Blow air gently into gingival crevice • Check all surfaces of the tooth
What are the types of instruments that can be used for excess cement removal? ✔✔U scaler/spoon excavator/dental floss
What type of handpiece should be used when removing excess bond material? ✔✔Low Speed Handpiece
Is overheating of the tooth a concern when removing excess bonding material? ✔✔Yes to fast of a speed can cause frictional heat.
What type of material is the bonding material used for bracket placement? ✔✔Composite resins.
What product will enhance the visibility of the adhesive resin remnant? ✔✔Use of an explorer rubbed over the area will result in a gray line for easy detection.
How does the resin appear in contrast to the glossy enamel surface? ✔✔The resin will appear opaque compared to the enamel surface.
At what percentage(s) for most patients is optimum analgesia produced? ✔✔30% - is the average for about 70% of the population.
Through which organ does nitrous oxide enter and exit through? ✔✔The lungs
What type of food limitations are adhered to for a patient who will be having nitrous oxide/oxygen? ✔✔Eat a light meal and avoid fatty, greasy foods.
What are the gas flow rates that are for adults? Children? ✔✔Tidal volume of 5-7 for adults and 3-4 for children
What is titration? ✔✔Administration of nitrous at a rate of ½ liter per minute after a 2 minute oxygenation start until the patient feels the relaxing effects of the nitrous. This is done rather than a set dose amount for each patient.
Why is it important to use the titration method? ✔✔Prevents oversedation and allows the patient to be in control of the experience.
What is the oxygenation time period for at the end of the procedure? ✔✔5-7 minutes
What Stage and Plane is nitrous oxide/oxygen analgesia desirable in? ✔✔Stage 1 Plane 2
Does nitrous oxide/oxygen eliminate the gag reflex? ✔✔It does not eliminate the gag reflex but it helps to relax it and many times produces such as radiographs or impression are performed under nitrous for patients who have a strong gag reflex.
What could be a genetic cause for malocclusion? ✔✔A smaller jaw size from one parent and a larger jaw size from the other.
What term is used for abnormal occlusion? ✔✔Malocclusion is the term used.
What tooth determines a person's occlusion? ✔✔The maxillary first molar.
If a tooth is not properly aligned with its opposing tooth ✔✔it is said to be in? ,A tooth not properly aligned with its opposing tooth in is crossbite.
If a person occludes and you cannot see the mandibular anteriors ✔✔what is that patient's diagnosis? ,Overbite would be the diagnosis.
What two positions does the orthodontist evaluate for facial symmetry? ✔✔The frontal view and the profile view used for evaluation.
To ease in the placement of orthodontic bands ✔✔what procedure is completed to wedge teeth apart? ,Separators are used to wedge teeth apart.
When bands are being cemented; what can be used to prevent cement from getting into the buccal tubes or attachments? ✔✔Chapstick or utility wax can be used to prevent cement from getting into the buccal tubes or attachments.
Are brackets cemented or bonded to the tooth? ✔✔Brackets are bonded.
Where would most auxiliary attachments be found on braces? ✔✔Most auxiliary attachments are found on the bands of braces.
What type of arch wire is indicated for correcting mal-aligned teeth? ✔✔A round arch wire is indicated for correcting mal-aligned teeth
What two ways can you measure an arch wire without placing it in a patient's mouth? ✔✔You can use a diagnostic model or the arch wire that you are replacing.
Besides using ligature ties ✔✔what other technique is used to hold in an arch wire? ,Elastomeric ties are used to hold in an arch wire.
What additional appliance might the orthodontist use to control growth and tooth movement? ✔✔Headgear might be used to control growth and tooth movement.
How can hard foods possibly harm braces? ✔✔Hard foods can loosen bands, pull out ligature ties, or bend arch wires.
How can a patient make flossing easier with braces? ✔✔A floss threader can be used to make flossing easier.
When a patient's braces come off ✔✔does that mean the treatment is over? ,No - usually the patient needs to have some type of appliance to keep the teeth in place.
Give an example of a retention appliance. ✔✔Positioner, Hawley retainer, and lingual retainer are examples of retention appliances.
