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Sp.imp.procedures./ orthodontic assistant training

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Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.

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  • 1. NEUTRAL ZONE IMPRESSION TECHNIQUE INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • 2. INTRODUCTION www.indiandentalacademy.com
  • 3. AimsAims To determine the space within which the denture can be sited without being subjected to excessive displacing forces from the surrounding musculature. www.indiandentalacademy.com
  • 4. The portion of the oral cavity that is or may be occupied by the maxillary and / or mandibular denture (s).www.indiandentalacademy.com
  • 5. Neutral ZoneNeutral Zone That area in the mouth, where, duringThat area in the mouth, where, during functions thefunctions the forcesforces of the tongueof the tongue pressingpressing outwardoutward areare neutralizedneutralized by theby the forcesforces of the cheeks and lips pressingof the cheeks and lips pressing inwardinward..  Hence a possible zone of equilibrium www.indiandentalacademy.com
  • 6. IndicationsIndications Past denture looseness due to powerful lower lip activity. Non-replacement of missing teeth leading to tongue / cheeks / lips partially occupying the usual denture space. Enlarged tongue, Abnormal anatomy, Inability to wear a lower denture www.indiandentalacademy.com
  • 7. To achieve optimum success in complete denture prosthesis, the dentures should be both retentive and stable. “The retention of denture is dependent on the accuracy of impression and fit of the denture base to the tissues”. “The stability of a denture dependent on occlusion, tooth position, flange form, and contours “. Tooth position , flange form, and contours are developed by the neutral zone procedures. www.indiandentalacademy.com
  • 8. How to record a neutral zone:How to record a neutral zone: www.indiandentalacademy.com
  • 9. .Various materials used to locate neutral zone. .Locating the neutral zone for lower arch and upper arch. . Locating the plane of occlusion. www.indiandentalacademy.com
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  • 12. Recommended movementsRecommended movements Suck Swallow ‘ooh’ ‘ah’ www.indiandentalacademy.com
  • 13. Technique – the trays are adjusted to eliminate overextension and create stable trays. Color -coded impression procedure- Two impression pastes of contrasting colors are used, the purpose is to locate areas of tissue displacement. The impression tray and two zinc oxide and eugenol pastes should be of three different colors. www.indiandentalacademy.com
  • 14. Lower and upper secondary impression Relief of pressure areas Correcting lower impression www.indiandentalacademy.com
  • 15. Border seal. Tissues at rest – overextended Extreme movements- underextended Technique used- CLOSED MOUTH TECHNIQUE Two advantages- 1.the desire to obtain a more accurate functional molding of the borders. 2. by having the patient close gently and swallow, there is more even distribution of pressure and impression material with less likelihood of excessive pressure in one area or the other. www.indiandentalacademy.com
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  • 17. Plaster matrices constructed around records. Matrices guide in arranging & waxing teeth & polished surfaces in optimum denture space. www.indiandentalacademy.com
  • 18. www.indiandentalacademy.com
  • 19. After wax trial is completed, external impressions are obtained using ZOE paste / light – bodied elastomer. www.indiandentalacademy.com
  • 20. conclusion The influence of tooth position and flange contour on denture stability is equal to or greater than that of any other factor. We should not insist that teeth be placed over the crest of the ridge, buccal or lingual to the ridge. Teeth should be placed as dictated by the musculature, and this will vary for different patients. Positioning artificial teeth in the neutral zone achieves two objectives. www.indiandentalacademy.com
  • 21. First the teeth will not interfere with the normal muscle function and second, the forces exerted by the musculature against the dentures are more favourable for stability and retention. www.indiandentalacademy.com
  • 22. For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com