Common Faults in Impression Making 2016
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This document discusses common faults that occur in dental impressions. It outlines 5 frequent faults that occur in lower impressions and their potential causes and corrections. The most common lower impression fault is insufficient depth in the posterior lingual pouch, which can be caused by a short tray flange, lack of impression material, inadequate force, or a trapped tongue. The document also outlines 5 common upper impression faults, such as shortage of material in the labial sulcus or excess material at the posterior palatal border of the tray. Throughout, diagrams demonstrate proper impressions versus faulty impressions and their corrections.
Common Faults in Impression Making 2016
- 2. COMMON FAULTS IN IMPRESSION MAKING Hpone Kyaw Myint Department of Prosthodontics University of Dental Medicine, Mandalay
- 3. Outline of the Presentation • Introduction • Common faults in lower impression • Common faults in upper impression 5/10/2016 HKM. UDMM 3
- 4. Introduction • Very first step for good and successful removable dental prosthesis • If objectives of primary impression are failed… 5/10/2016 HKM. UDMM 4
- 5. Common faults in lower impression • Five faults • Order in frequency of fault • Reasons as well as correction methods are described 5/10/2016 HKM. UDMM 5
- 6. • Fault #. 1 insufficient depth in the posterior lingual pouch • Most occurring one 5/10/2016 HKM. UDMM 6 Common faults in lower impression
- 7. 5/10/2016 HKM. UDMM 7 Proper Impression
- 8. Fault #. 1 may be caused by 1. Tray flang is too short 2. Shortage of impression composition 3. In adequate force 4. Tongue trapped 5/10/2016 HKM. UDMM 8 Common faults in lower impression
- 9. Corrections for fault #. 1 are 1. Use long flange 2. Get sufficient impression composition 3. Use due force 4. Instruct the patient to raise the tongue 5/10/2016 HKM. UDMM 9 Common faults in lower impression
- 10. • Fault #. 2 insufficient depth in the lingual, labial and buccal sulci • Second most occurring one 5/10/2016 HKM. UDMM 10 Common faults in lower impression
- 11. 5/10/2016 HKM. UDMM 11 Proper Impression
- 12. Fault #. 2 may be caused by 1. Lack of impression material 2. Using low pressure to seat tray 3. Material is too cold and can’t flow 5/10/2016 HKM. UDMM 12 Common faults in lower impression
- 13. Corrections for fault #. 2 are 1. Use sufficient compo 2. Use proper pressure 3. Manipulate material properly and adequately 5/10/2016 HKM. UDMM 13 Common faults in lower impression
- 14. • Fault #. 3 the presence of smooth hollow in the buccal distal periphery • Sometime occurs 5/10/2016 HKM. UDMM 14 Common faults in lower impression
- 15. 5/10/2016 HKM. UDMM 15 Proper Impression
- 16. Fault #. 3 may be caused by • Trapping of cheek 5/10/2016 HKM. UDMM 16 Common faults in lower impression
- 17. Corrections for fault #. 3 are 1. Functional exercise 2. Retraction of cheek during pressing the tray 5/10/2016 HKM. UDMM 17 Common faults in lower impression
- 18. • Fault #. 4 edge of the tray showing through the impression • Occasionally occur 5/10/2016 HKM. UDMM 18 Common faults in lower impression
- 19. 5/10/2016 HKM. UDMM 19 Proper Impression
- 20. Fault #. 4 may be caused by 1. Incorrect centering of tray 2. No sufficient back ward pressure on tray 3. Improper size of tray 4. Long flanges of the tray 5/10/2016 HKM. UDMM 20 Common faults in lower impression
- 21. Corrections for fault #. 4 are 1. Centre tray before pressing 2. Sure to give back ward pressure 3. Choose tray judiciously 5/10/2016 HKM. UDMM 21 Common faults in lower impression
- 22. Fault #. 5 an asymmetrical impression • Rarely occur 5/10/2016 HKM. UDMM 22 Common faults in lower impression
- 23. 5/10/2016 HKM. UDMM 23 Proper Impression
- 24. Fault #. 5 may be caused by • Unbalance loading of material • Ignorance of operator 5/10/2016 HKM. UDMM 24 Common faults in lower impression
- 25. • Corrections for fault #. 5 are 1. Load material smartly 2. Care to seat loaded tray 5/10/2016 HKM. UDMM 25 Common faults in lower impression
- 26. 5/10/2016 HKM. UDMM 26 This is the end of the part I. Part II will be continue on March 25, 2016 at 1300 hour to 1400 hour. Thank you for your kind attention!
- 27. Common faults in upper impression 5/10/2016 HKM. UDMM 27 • Five faults • Order in frequency of fault • Reasons as well as correction methods are described
- 28. Fault #. 1 shortage of impressio more regions of labial sulcus, es tuberosities or the labial sulcus • Most commonly occur 5/10/2016 HKM. UDMM 28 Common faults in upper impression
- 29. 5/10/2016 HKM. UDMM 29 Proper Impression
- 30. Fault #. 1 may be caused by • Material shortage • Failure to mold material • fail;ure to pull upper lip • Low pressure • Cold material 5/10/2016 HKM. UDMM 30 Common faults in upper impression
- 31. 5/10/2016 HKM. UDMM 31 • Corrections for fault #. 1 are 1. Load material smartly 2. Care to seat loaded tray Common faults in upper impression
- 32. Fault #. 2 too much compositio posterior palatal border of the t • Frequently occur 5/10/2016 HKM. UDMM 32 Common faults in upper impression
- 33. 5/10/2016 HKM. UDMM 33 Proper Impression
- 34. Fault #. 2 may be caused by • Usage of undue force • Retaining pressure for long time • Loading too much composition in palatal area 5/10/2016 HKM. UDMM 34 Common faults in upper impression
- 35. Corrections for fault #. 2 • Make sure of pressure • Stop upward pressure on tray if app 1 cm • Loading material properly 5/10/2016 HKM. UDMM 35 Common faults in upper impression
- 36. Fault #. 3 exposed tray • Occasionally occur 5/10/2016 HKM. UDMM 36 Common faults in upper impression
- 37. 5/10/2016 HKM. UDMM 37 Proper Impression
- 38. Fault #. 3 may be caused by • Poor tray selection • Poor tray adaption • Incorrect centring of tray 5/10/2016 HKM. UDMM 38 Common faults in upper impression
- 39. Corrections for fault #. 3 • Good knowledge in tray selection • Smartly prepared the tray • Careful seating of tray 5/10/2016 HKM. UDMM 39 Common faults in upper impression
- 40. Fault #. 4 many compo in labial • Sometimes occur 5/10/2016 HKM. UDMM 40 Common faults in upper impression
- 41. 5/10/2016 HKM. UDMM 41 Proper Impression
- 42. Fault #. 4 may be caused by • Unrelated tray and ridge • Too much material in front of the tray 5/10/2016 HKM. UDMM 42 Common faults in upper impression
- 43. Corrections for fault #. 4 • Care in seating tray over the ridge • Put only sufficient composition in front of the tray 5/10/2016 HKM. UDMM 43 Common faults in upper impression
- 44. Fault #. 5 void of material at the the palate • Rarely occur 5/10/2016 HKM. UDMM 44 Common faults in upper impression
- 45. 5/10/2016 HKM. UDMM 45 Proper Impression
- 46. Fault #. 5 may be caused by • Material shortage • Low pressure • Cold composition • Trapped air 5/10/2016 HKM. UDMM 46 Common faults in upper impression
- 47. Corrections for fault #. 5 • Use sufficient material • Applied due force • Use warm material5/10/2016 HKM. UDMM 47 Common faults in upper impression
- 48. Reference • Fenn; Clinical Dental Prosthetic 5/10/2016 HKM. UDMM 48
- 49. 5/10/2016 HKM. UDMM 49 Thank you for your kind attention…
Editor's Notes
- #5: The most very first step… And can be told as one of the important step in beautiful fabrication of removable dental prosthetic for completely edentulous jaws is primary impression making. Good removable prosthesis can’t be happened… If there is no adequate denture bearing area. Good removable prosthesis can’t be happened… If there is no full functional depth of fornex vestibule. Good removable prosthesis can’t be happened… If there is… Good removable prosthesis can’t… Also there were… and there are many faults that make ugly, worse and worthless impression. Among these, some commonly occur faults will be presented