This video describes use of two mirrors with the operator seated and the patient in a supine position for making complete denture impressions. Dalhousie Faculty of Dentistry Removable Prosthodontics Website: removpros.dentistry.dal.ca
Thank you dr loney i am a dentist based in india and i have been using your techniques with great success..thank you for posting such great educational content..i am coming down to canada this may was hoping to meet you in person.
Hi Dr. Loney!! Thank you for all your videos, they have helped me in my education so much over the years! I noticed there isn’t any videos on RU-vid explaining proper RPD final impression technique. I believe it would be so so helpful to a lot of us dentists and dental students if you could make a video on proper RPD final impression technique. Thank you so much 🙏
Thanks. That's a great idea. In the mean time, you can download and take a look at my PowerPoint presentations, 'Dalhousie RPD Protocol' and 'Altered Cast Impressions' which include moderately detailed discussions on how to make a final RPD impressions. Here is the URL: removpros.dentistry.dal.ca/RPD.html
Light body was used for both. Heavy body can cause more displacement/distortion of soft tissues due to its viscosity. Normally this is less desirable for soft tissue impressions.
Zinc oxide and eugenol impression pastes can be used to make good complete denture impressions. However we have stopped using those materials at our dental school for several reasons. Polyvinylsiloxane (PVS) impression materials can be used for all our impressions (crowns, removable partial dentures, etc.) so we need to purchase fewer materials (cost, inventory). Additionally, they are more pleasant for patients in regard to taste, they are available in multiple viscosities, they can be poured a long time after removal from the mouth, they remove more easily from undercuts (flexible) and they are among the most accurate impression materials. For these main reasons we have chosen them as our standard material for final impressions for all analogue procedures.
You CAN place the posterior of the tray first and subsequently rotate the anterior portion into place. However, common problems with the posterior-first technique include 1) creating a seal with impression material at the back edge of the tray and thereby trapping air (and possibly excess material) in the palatial vault, 2) not being able to rotate the anterior flange past the height of the anterior ridge (and therefore not seating the tray fully), trapping excess material in the anterior vestibule, leading to a distorted and severely thickened anterior denture flange and 4) having difficulty aligning the labial notch of the tray properly with the labial frenulum (too far left or right). Many clinicians use the posterior-first technique with good results after experience. It is the technique that I was first taught, with the rationale that it would create a seal and prevent excess running to the back of the patient’s throat. The anterior-first technique does cause the excess to exit the posterior of the tray, but it is easy to remove there and it does tend to minimize the other problems.
Please see the videos on Occlusal Vertical Dimension and Centric Relation Record on my RU-vid channel or on my website: removpros.dentistry.dal.ca/Videos.html
