Showing posts with label crown. Show all posts
Showing posts with label crown. Show all posts

Tuesday, October 11, 2011

Impression Tips—Voids

   ISSUE: Voids on the margin of a preparation compromise   
   the fit and function of the final restoration.    


Cause and Solution:


1. Syringe Technique
     • Voids may be reduced by using a stirring motion while syringing, keeping the syringe tip immersed 
        to avoid trapping air.


2. Air incorporated when loading intraoral syringe
     • Front load syringe by inserting mix tip directly into intraoral syringe and forcing the plunger 
       backwards.




   ISSUE: Voids on occlusal surfaces make articulation  

Cause and Solution:

1. Insufficient Tray Support (weak or low tray walls)
     • Use custom or inflexible (preferably metal) stock trays.

2. Teeth in contact with tray and/or not adequately relieving  pre-set impression material
     • Avoid contact of teeth with tray, or pre-set tray material.

3. Insufficient die trimming
     • Consult with dental laboratory.




If you have questions or would like more information, please call 1.800.359.2455.

Monday, September 12, 2011

Impression Tips—Tight Fitting Crowns

   ISSUE: Tight Crowns   


Cause and Solution:


1. Early Mouth Removal
     • Closely follow product recommendation for oral setting time.


2. Seating partially set impression material
     • Closely follow product recommendation for oral working time.


3. Poor bond of material to tray
     • Always use a VPS tray adhesive and allow to dry as per product instructions.





   ISSUE: Short Crowns   

Cause and Solution:

1. Insufficient Tray Support (weak or low tray walls)
     • Use custom or inflexible (preferably metal) stock trays.

2. Teeth in contact with tray and/or not adequately relieving  pre-set impression material
     • Avoid contact of teeth with tray, or pre-set tray material.

3. Insufficient die trimming
     • Consult with dental laboratory.