Principles of teeth arrangement and compensatory curves

#arrangement od anteriors #maxillary teeth #mandibular teeth #anteriors #posteriors #preclinical prosthetics #dentistry #carving and polishing #compensatory curves #curve of spee #curve of wilson #curve of monsoon #mandibular posteriors #maxillary posteriors #glass plate relationship #dentures #oldage dentistry #principles of teeth arrangement #basic principles of teeth arrangement

1. Good Morning

2. Presentaton by : Huma Javeriya Guided by : Dr. Tanveer mam Teeth Arrangement

3. Maxillary Central Incisors Front : long axis parallel to the vertical axis. Side :slopes labially at about 14◦. Occlusal plane : incisal edge is in contact with occlusal plane.

4. Maxillary lateral incisors When viewed from Front : long axis slopes towards midline at incisal edge. Side :slopes labially at about 20◦ . Occlusal plane : incisal edge is 1mm short of Occlusal plane .

5. Maxillary canine Front : long axis parallel to the vertical axis. Side :long axis parallel to the vertical axis. Occlusal plane : cuspid tip is in contact with occlusal plane.

6. Mandibular central incisors When viewed from Front : long axis inclines slightly towards the vertical axis. Side : slopes labially. Occlusal plane : incisal edge is 0.5-1 mm above the occlusal plane.

7. Mandibular lateral incisors When viewed from Front : long axis inclines towards the vertical axis. Side : slopes labially less than central incisor. Occlusal plane : incisal edge is 0.5-1mm above occlusal plane.

8. Mandibular canine When viewed from Front : long axis inclines towards the midline. Side : slopes lingually. Occlusal plane : cuspid tip is 0.5-1mm above occlusal plane .

9. Class 1 canine relationship

10. Overjet overbite Overjet horizontal overlap is 0.5-1mm. O verbite is the vertical overlap and it of about 1-2mm.

11. Posteriors

12. Maxillary 1 st premolar When viewed from Front : long axis parallel towards the vertical axis. Side : long axis parallel towards the vertical axis . Occlusal plane :buccal cusp is in contact with occlusal plane and palatal cusp is 1mm short of occlusal plane

13. Maxillary 2 nd premolar When viewed from Front : long axis parallel towards the vertical axis. Side : long axis parallel towards the vertical axis. Occlusal plane : Both buccal cusp and palatal cusp are in contact with occlusal plane.

14. Maxillary 1 st molar When viewed from Front : long axis slopes buccaly. Side : long axis slopes distally. Occlusal plane : only mesiopalatal cusp in contact with occlusal plane.

15. Maxillary 2 nd molar When viewed from Front : long axis slopes buccaly and more steeply than the 1 st molar. Side : long axis slopes distally more steeply than the 1 st molar. . Occlusal plane : only mesiopalatal cusp is nearest to occlusal plane.

16. Maxillary teeth set, checked on a glass plate

17. Mandibular 1 st molar Front : long axis leans lingually. Side : long axis lean mesially. Occlusal plane : all cusps are at higher level than n 2 nd premolar, buccal and distal cusps higher than the other two. Occlusal contact : the mesiobuccal cusp occludes n the fossa between upper 2 nd premolar ant 1 st molar.

18. Mandibular 1 st premolar Front : long axis parallel towards the vertical axis. Side : long axis parallel towards the vertical axis . Occlusal plane : lingual cusp below the horizontal plane, buccal cusp is 2mm above the occlusal plane. Occlusal contact : buccal cusp contacts the mesial marginal ridge of upper first premolar.

19. Mandibular 2 nd premolar When viewed from Front : long axis parallel towards the vertical axis. Side : long axis parallel towards the vertical axis. Occlusal plane : both cusp are 2mm above the occlusal plane. Occlusal contact : buccal cusp contacts the fossa between the two upper premolars.

20. Mandibular 2 nd molar Front : long axis leans more lingually. Side : long axis lean more mesially. Occlusal plane : all cusps are at higher level than 1 st molar, buccal and distal cusps higher than the other two. Occlusal contact : the mesiobuccal cusp occludes n the fossa between the two upper molars.

21. Carving and polishing. Adapt the softened roll of baseplate wax on the facial surface and extend. Seal the baseplate wax around the neck of each tooth with a wax spatula. Carve the gingival margins of anterior teeth with a carver held approximately at 60◦ Carve the gingival margins of posterior teeth by a carver held approximately at 45◦. Use a gas touch to flame the wax surface taking care not to over heat the gingival contours. The maxirally waxed denture shows the gingival contour and the root forms. Adapt the baseplate wax on lingual surface of the trial denture and carve.

22. Completed Teeth arrangement

23. Compensatory curves The Anteroposterior and lateral curvatures in the alignment of the occluding surfaces and the incisal edges of the artificial teeth that are used to develop a balanced occlusion .

24. Curve of spee . The anatomic curve established by the occlusal alignment of the teeth, as projected onto the median plane, beginning with the cusp tip of mandibular canine and following the buccal cusp tips of the premolars and molars and continuing with the anterior border of the mandibular ramus and ending with the anterior most portion of the mandibular condyle.

25. Curve of wilson It is used to arrange the molars The lower teeth are inclined lingually, giving prominence to the buccal cusps and brining them into heavy occlusal contact with the upper buccal cusp during lateral movements on working side

26. Curve of monsoon Curve of occlusion in which each cusp and incisal edge touches a segment of a surface of a sphere 8 inches in diameter with its centre in the region of the glabella

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28. Thank you