Impressions
Accu-Dent Impression System •Irreversible hydrocolloid (hydrophilic) •Two viscosities •Non-slumping •Premeasured sealed packaging •Syringe delivery •Temperature controlled •Unique tray design •Single entry impression system
Accu-Dent Impression System System 1 (edentulous)
System 2 (dentate)
Accu-Dent System 1 Impression System
Accu-Dent System 1 Impression System • System one Accu-gel materials are specially formulated to make impressions of edentulous arches dentate arches • The trays are specifically designed for this purpose • It features a syringe system that facilitates the delivery of impression material into the buccal and labial flange areas
Impressions for the maxillary edentulous arch
Syringe Gel Use the “System 1” side of the measuring vial to proportion the exact amount of water for the syringe gel
The syringe gel mixes quickly and smoothly
Syringe Gel Remove the plunger and back load the syringe
Engage the plunger and press material into the syringe tip
Tray Gel Again use the “System 1� side of the vial to measure the appropriate amount of water for the tray gel
Tray Gel Note that the tray gel appears dry at the start of mixing. Do not add water. In several seconds it will develop into a creamy mix.
Loading the Tray Rub the surface of the loaded tray material with water
Note the tray material is loaded heaviest in the anterior section of the tray
Loading the Tray Apply a small amount of material on the initial loading of the tray. This allows the material to be pressed into the retentive holes of the tray
After all the retentive holes have been engaged add the remaining material to the tray
Making the Impression Begin injecting the material directly into the hamular notch area on one side of the arch
Continue injecting (keeping the tip of the syringe imbedded into the material) up to the labial frenum and stop
Making the Impression
Inject into the hamular notch of the opposite side and continue forward to the labial frenum
Making the Impression Inject some material to anterior hard palate area
Note how the material “attaches (hydrophilic)” to the tissue and does not “drip (non-slumping)”
Taking the Impression Gently seat the tray in the patient’s mouth (do not overseat”
As soon as material extrudes from the back of the tray “stop” seating
Border Molding Gently hold the lower border of the upper lip and pull forward
Have patient slowly open wide
Border Molding
Gently massage the right and left cheeks of the patient
Tray Removal Carefully remove the impression by breaking the seal at the perpheral borders (Do not remove impression by tugging on the handle of the tray) Thoroughly rinse impression of saliva
Tray Removal Disinfect impression using materials and techniques appropriate for irreversible hydrocolloid materials Support the impression using the Accu-dent tray holder (do not lay impression on counter)
Final Impression
Note the accuracy of the peripheral border registrations
Final Impression
In particular note the detailed registration of the hamular notch area
Border molded final maxillary impression
Impressions for the mandibular edentulous arch
The mandibular Accu-dent impression is not a border molded like the maxillary impression
The intent of the mandibular impression is to obtain a “fully extended impression� to facilitate the identification of the anatomical landmarks that will guide the outline of the denture border extensions
Tray Selection (distal rise) Moderately resorbed ridges gradually incline to the ramus
This gradual incline (low distal rise) is reflected in the mandibular trays #25-29
Tray Selection (distal rise) Severely resorbed ridges have a more abrupt incline to the ramus
This high distal rise is reflected in the mandibular trays #20-24
Tray Selection (size) The “tray selection tool� facilitates the proper size selection for the mandibular impression tray Measure approximately where the first molars are located on patients existing denture or on their ridge and select a tray that lines up to the center of the retentive holes of the tray
Making the Impression
The syringe gel material is first injected first over the retromolar pad area and than pulled forward up to the midline area
Making the Impression The opposite retromolar pad is covered and the material is pulled forward to meet the contra-lateral side
Insert the loaded tray asking the patient to place their tongue between the lingual flanges of the tray
Fully extended mandibular impression
Fully extended mandibular impression options
If the anatomy is accurately identified and marked this impression can serve as the final impression
Fully extended mandibular impression options
‌.or this impression can serve as preliminary impression for the fabrication of a custom impression tray
Fully extended mandibular impression options
‌.or this impression can serve to fabricate a interim denture that will be functionally relined several weeks after delivery
Impressions for the partially edentulous arch
Accu-Dent System 2 Impression System
Accu-Dent System 2 Impression System • System two Accu-gel materials are specially formulated to make impressions of dentate arches for partial dentures, crown & bridge opposing casts, occlusal splints, diagnostic casts, etc. • The trays are specifically designed for this purpose • It features the Pre-Sure tip that attaches to the syringe that virtually guarantees bubble free impressions of tooth surfaces
The “Pre-Sure tip� facilitates the delivery of the Accu-gel material directly to the teeth and surrounding gingiva and virtually guarantees a bubble free impression
The tip is flexible and can be pressed against the teeth and gingiva without discomfort to the patient
The tip provides an excellent vehicle to accurately deliver the syringe gel
Place the Pre-Sure tip firmly against the last tooth in the arch and drag forward while injecting
Turn the syringe at a 45 degree angle in the anterior area and press firmly against the labial surfaces of the teeth
Do the same to the opposite side of the arch
Inject directly onto the lingual surfaces of the anterior teeth
Remove the Pre-Sure tip and inject into the buccal and labial sulcus
Inject some material onto the anterior hard palate area
Final Impression Note the “clarity� of the teeth and surrounding gingiva
Final Impression Note the accuracy and extension of the peripheral borders
System 2 cast preparation Double pour technique
Optional Die Stones • • • • •
Milestone* Resin Rock* Die stone True stone Die keen
Heraeus Whip mix Heraeus Heraeus Heraeus
psi 18,000 11,000 15,000 15,000 18,000
exp .08 .08 .07 .09 .18
*Milestone & Resin Rock are resin reinforced and therefore provides strength in thin areas
Note: Fugi Rock (GC) & Vel Mix (Kerr) are not compatible with Accu-dent
cost 55 45 38 34 54
Always support the cast into the impression holder that comes with the Accu-Dent kit
Wait until the cast appears to be “dry� before inverting
Prepare second mix of stone and invert impression to form the base
These impression were poured using die stone. Note the “retentive tabs” left on the surface which will mechanically retain the plaster base
The “retentive tabs” will allow the plaster base to be poured later in the day
It is economical to make the second pour in plaster
Also the plaster is much easier to trim
Final Impressions
Note the absence of occlusal and surrounding gingival defects
Final Impressions
Accurate impressions replicate patient’s occlusion