10.
posterior teeth arrangement
1. 1. ARRANGEMENT OF POSTERIOR TEETH
2. 2. Learning outcomes 1. Explain individual posterior tooth arrangement. 2. Define balanced articulation. 3. List the factors affecting balanced
articulation.
3. 3. Maxillary Anterior Teeth Checklist Anteriors – Arch Form – Symmetry
4. 4. MAXILLARY POSTERIOR TEETH Maxillary First and Second Premolar
5. 5. Maxillary First Premolar
6. 6. Maxillary Second Premolar
7. 7. The long axis of the premolars should be perpendicular to the occlusal plane and the buccal and lingual cusp tips should touch the occlusal plane.
Maxillary Premolar Teeth Occlusal plane
8. 8. Both the buccal and lingual cusp tips of the maxillary premolars should contact the plane of occlusion. The Maxillary Premolars
9. 9. MAXILLARY POSTERIOR TEETH Maxillary First and Second Molar
10. 10. Maxillary First Molar
11. 11. Maxillary First Molar
12. 12. Maxillary 1st Molar The mesio-palatal cusp tip of the 1st molar contacts the occlusal plane but the buccal cusp tips and the distal lingual cusp are
elevated about 0.5mm off the occlusal plane.
13. 13. Maxillary Second Molar 1.0 mm above the occlusal plane 1.5 mm
14. 14. Maxillary Second Molar 1.0 mm above the occlusal plane 1.5 mm
15. 15. Maxillary 2nd Molar Occlusal plane No cusps touch the occlusal plane.
16. 16. The maxillary teeth viewed from the occlusal surface should follow the following guidelines: The distolabial surface of the canine, the buccal
surfaces of the premolars and the mesiobuccal surface of the 1st molar should follow a straight line.
17. 17. The distobuccal surface of the 1st molar and buccal surfaces of the 2nd molar are slightly inwards and are placed so that all buccal surfaces of the
1st and 2nd molars follow a straight line.
18. 18. Posteriors Ridge Relationship Arch Form Arch Symmetry Compensating Curve Compensating Curve
19. 19. Compensating curve The anteroposterior curving and the mediolateral curving of the occluding surfaces and incisal edges of artificial teeth that is
used to develop balanced occlusion.
20. 20. Christensen’s phenomenon The space that occurs between opposing occlusal surfaces during mandibular protrusion.
21. 21. Christian Phenom.AVIChristian Phenom.AVI
22. 22. MANDIBULAR POSTERIOR TEETH Mandibular First Molar This tooth is KEY TOOTH in occlusion so it has to be arranged first.
23. 23. Mesiobuccal cusp of upper first molar occludes with mesiobuccal groove of lower first molar Key of occlusion
24. 24. Setting the Mandibular Posterior Teeth The Mandibular 1st Molar Begin by positioning the mandibular 1st molar. The mesial buccal cusp tip should
engage the embrasure between the 1st molar and 2nd premolar.
25. 25. Mandibular 2nd Premolar Position the mandibular 2nd premolar. The buccal cusp of the 2nd premolar should occlude with the adjacent marginal
ridges of the maxillary 1st and 2nd premolars.
26. 26. The Mandibular 1st Premolar The buccal cusp of the mandibular 1st premolar should engage the mesial marginal ridge of the opposing 1st
premolar.
27. 27. The Mandibular 2nd Molar The mandibular 2nd molar is placed with the mesiobuccal cusp should engage between the maxillary 1st and 2nd
molars and contact with their marginal ridges.
28. 28. Mandibular Posterior Teeth The mandibular cusps tips are designed to engage the embrasures of the opposing maxillary teeth. Completed set up
Centric
29. 29. Additional Guidelines for Arranging the Mandibular Posterior Denture Teeth 2/3 up the retromolar pad
30. 30. Verify that the posterior mandibular teeth are centered over the crest of the ridge.
31. 31. Completed teeth arrangement Centric occlusion=Centric relation in complete dentures
32. 32. Complete Denture Occlusion Bilateral Posterior Centric Contact Centralized Forces “Balanced” Articulation to minimize tipping
33. 33. Mobile bases on mucosa Teeth move as an unit Malocclusion affects entire base immediately Non-vertical forces affect all teeth and is
traumatic Incising affects all teeth attached to base Bilateral balance is often desired for base stability Decreased tactile sense Retained in PDL
Teeth move independently Malocclusion effects not immediate Non-vertical forces affect only teeth involved and usually well tolerated Incising
doesn’t affect posteriors Bilateral balance is rare Tactile sensitivity Natural Dentition Denture “Dentition” Differences between Natural and Complete
Denture Occlusion
34. 34. Goals of Complete Denture Occlusion Decrease trauma to the supporting structures Preserve remaining structures Enhance stability
Improved Esthetics, Speech and Mastication
35. 35. Difference between occlusion and articulation Occlusion: the static relationship between the incising or masticating surfaces of the maxillary or
mandibular teeth.
36. 36. Articulation: the static and dynamic contact relationship between the occlusal surfaces of the teeth during function.
37. 37. Balanced articulation The bilateral, simultaneous anterior and posterior occlusal contact of teeth in centric and eccentric positions.
38. 38. Balanced occlusion - Stability
39. 39. Bilateral Balanced Denture Articulation Protrusive Balancing Working Centric
40. 40. Bilateral Balanced Denture Articulation Protrusive
41. 41. Balancing Side Protrusive Centric Occlusion Bilateral Balanced Denture Articulation Working Side HOW DO WE ESTABLISH. . .
42. 42. Five Factors Affecting Occlusal Balance 1. Condylar Guidance 2. Incisal Guidance 3. Orientation of Occlusal Plane 4. Compensating Curve 5.
Cuspal Inclination
43. 43. Condylar Guidance
44. 44. Condylar Guidance is due to the path the condyles follow in TMJ. In complete denture, of the five factors, the patient presents you with
Condylar Guidance.
45. 45. Incisal Guidance
46. 46. Orientation of Occlusal Plane
47. 47. Compensating Curve
48. 48. Cuspal Inclination
49. 49. Types of posterior teeth
50. 50. Condylar Guidance, Incisal Guidance, Orientation of Occlusal Plane, Compensating Curve, Cuspal Inclination
51. 51. Balancing Side Protrusive Centric Occlusion Bilateral Balanced Denture Articulation Working Side
