Taking Alginate Impressions- Chapter 27

Use of alginate impression material is the most common method for obtaining diagnositc __________.

Casts

Trays that have not been "________" or "________" for taking the impression should be sterilized before they are returned to storage.

"Tried" "Used"

Use of alginate impression material is the most common method for obtaining diagnositc __________.

Casts

Trays that have not been "________" or "________" for taking the impression should be sterilized before they are returned to storage.

"Tried" "Used"

The Maxillary tray may also have _____________ placed in the palatal area of the tray to support the alginate in high vault and to avoid trapping air.

-Rope Wax

To guard against spills place a _____________ on the patient to protect his or her clothing

-Napkin (Bib)

Preparation of the Patient: Dental Appliances:
-Have the patient take out all removable dental appliances such as ________ or ______________ dentures, ortho retainers. Cover the gingival areas of fixed bridges and other fixed appliances with ________________ to prevent aligante from locking under crowns and pontics which causes tearing and distortion.

-Full or partial
-Rope Wax

Armamentarium For Taking Alginate Impressions:
-Impression trays
-_________ wax
-Rubber mixing bowl
-Alginate ____________ and _______________
-Measuring scoop
-Water measurer
-________water
-Disinfecting solution
-___________________
-Infection control attire
-Air/water syringe
-Gauze

-Rope
-Spatula
-Powder
-Mouthwash

For seating the impression on the mandibular arch the clinician should sit at:

-7 O'clock for right handed
-5 O'clock for left handed

Seating the Impression: Mandibular Arch:
-Dry teeth with (2x2 gauze & air/water syringe)
-Retract cheek with fingers or mirror
-Rub a little ___________ material over the _____________ & _____________________ surfaces (this additional ____________ material helps reduce air bubbles in impression)
-Grasp handle of tray so tray and alginate are facing ________________.
-Rotate tray in mouth; Use the front of the tray to retract the _________ cheek and your free hand to retract the ______ cheek. (adjust so tray handle is in line with midline of face)
-Press on tray till _________________ is felt; Lip should lap over front of tray and Alginate should fill the ____________________

-Alginate
-Occlusal
-Interproximal
-Alginate
-Downward
-Near
-Far
-Resistance
-Labial periphery

Once Mandibular tray is inserted:
-Once tray is seated use index fingers to manipulate the patient's cheeks and release air from the ____________________ area (this will create a more detailed anatomy)
-Ask patient to raise tongue to the roof of mouth and relax cheek muscles
-Carry tray in a ______________________ direction
-If gagging seat patient _____________ and ask patient to lean slightly forward
-Keep tray in place until alginate is set (2-3mins after ______________)

-Vestibular areas
-Downward
-Upright
-Gelation

When taking a maxillary impression, a right-handed operator should be standing in which position?

11 O'clock

When mixing alginate impression material:

Add the powder to the water

All of the following statements are true about the "working time" of alginate material except one. Which one is the exception?

Working time begins when the impression is seated

Impression trays are usually _______________ so that the alginate will flow through the holes when the tray seated on the dental arch

perforated

Sitting the impression: Maxillary arch
-Operator positioning (back-side) referred to as ____ o'clock or 1 for lefties
-wipe arch with a 2x2 ______
-have patient open and use index finger and thumb to retract their cheek and rub a small amount of alginate the ___________ and ____________ surface to eliminate air bubbles on the impression
-tray and materials should be facing __________
-Turn tray slightly to _____ side placing tray in mouth then straighten out.
-Apply light and even ____________ (posterior first then anterior to allow the air to be expressed through the front of the tray)
-Instruct patient to ___________
-set a _______ according to the materials set time

-11
-gauze
-occlusal and interproximal
-upwards
-one
-Pressure
-breathe
-timer

Proper tray selection: before taking impressions, one should conduct an oral exam to assess the mx and md arch for its width, length, or presence of _____________ _______ or _____________ ______________. You also want tp cover teeth ________ and the vestibule, 2-3mm beyond the ________ tooth, include the ______________ pad

-mandibular tori
-maxillary exostosis
-facially
-last
-retromolar

sequence:
______________ first!!!!!!

mandibular

Mixing alginate:
-Make sure you have the necessary ___________
-shake or "_______" the can, wait _____ sec to allow the "dust" to settle before opening the lid
-Place one measure of ______ for each scoop of alginate powder into the flexible rubber bowl. Cooler water allows for more working time
-Follow manufactures instructions and then add the alginate to the bowl containing the water
-________ and mix the powder and water
-Once the two have been mixed, rotate bowl in hand and vigorously press the spatula flat against the ______ with other hand creating a _____________ mix
-With spatula, gather the alginate material into one mass in the bowl

-equipment
-fluff/ 30 sec
-water
-stir
-bowl
-homogeneous

Removing the mandibular tray:
-Use fingers of one hand to retract ______ of the mouth and allow air into vestibule
-To remove, place the middle and index finger under _________, the free hand should be used to stabilize mandibular arch
-Use firm __________ lifting motion and it should flip free
-If it does not release, a _________ has created. To break place index under periphery of the posterior on right or left
-Then assess impression

-corner
-tray handle
-sideways
-suction seal

The typical mixing time for alginate is ________ and the setting time for regular set material is_______

-1 minute
-3-4 minutes

When preparing the patient for an impression, the operator should:
A. Explain procedure
B. Place a napkin on patient to protect clothing
C. Place patient in upright position
D. Have patient remove all removable appliances
E. Have patient rinse with antibacterial mouthwash

ALLLLLLLLLL

Post removal procedure:
-After removal, ask patient to _________ to remove excess
-Use an ________ or floss to remove excess between teeth
-Before dismissing, have them rinse again
-*Be sure to return any removable ______________to patient

-rinse
-explorer
-dental appliances

How to disinfect the impression:
-Gently rinse under ________ water to remove debris
-Gently ___________ off water
-Spray entire impression with _______ approved disinfectant
-Place impression in a headrest cover or plastic bag
-Disinfection is usually done within ________ minutes
-Rinse again with water, shake dry, and place in clean baggie
-If impression can not be poured immediately store in area with ______% humidity

-cool
-shake
-OSHA
-10
-100%

Removing the maxillary tray:
-With fingers of one hand, retract corner of mouth to allow air into __________
-Grasp tray handle with thumb on top of the handle and the middle and index fingers between the tray and the ___________ teeth
-Break the seal and use a __________, sideways _________ motion
-Free hand should be used to ________ the head
-Assess the impression

-vestibule
-opposing
-downward
-flipping
-stabilize

To minimize the chance of ____________ or _____________, have the patient breathe through his or her nose while seated in an ___________ position

-gagging
-vomiting
-upright

How long does it take to set for regular alginate material and fast set material?

Regular: 3-4 minutes
Fast: 1-2 minutes

When filling a tray with alginate material:
-Load material on spatula
-One hand holds _______ and the other holds the _______ and begin loading the mandibular tray first
-Start loading on the facial aspect and continue on, once done ______ material in tray to get rid of ________
-Move onto the maxillary tray and load from __________ pushing alginate anterior, then eliminate air by pushing down
-Use a fingertip that is ________ with tap water and smooth the material and make slight indentation on occlusal surfaces to help place tray on teeth and eliminate air bubbles

-material
-tray
-press
-trapped air
-posterior
-moistened

What is the working time for alginate?

1 minute

What is the purpose of taking an alginate impression?

To make an accurate reproduction of the maxillary and mandibular arches and adjacent tissues

How to explain impression procedure for patient:
-Ask if they have had it done before, if not explain.
-Explain ___________ (similar to mashed potatoes or pudding and then into a silly putty)
-Tell them to follow your directions and it will take ________ minutes
-Instruct them not to _______ and to raise their ______ if nay discomfort

-texture
-3-4 minutes
-talk
-hand

What should the patient do before applying impression tray?

RINSE! to reduce bacteria, debris and saliva

What is the purpose of applying wax on a tray?

-Protects the tissues from injury
-extends the tray
-May aid in the retention of alginate material within the tray

Types of impression trays available....

-Disposable (single use)
-Autoclavable (permanent) made of stainless steel