IN THE NAME OF GOD

1. IN THE NAME OF GOD EXTRACTION OF FIRST PERMANENT MOLARS Dr:Nahvi

3. THE EFFECT OF LOSS OF THE FIRST PERMANENT MOLAR • Diminished local function • Drifting of teeth • Continued eruption of opposing teeth • Midline deviation • Increasing overbite ShaheedBeheshti University of Dental Journal

4. FACTORS TO CONSIDER WHEN PLANNING EXTRACTION OF FIRST PERMANENT MOLARS • the restorative state of the tooth • presence and condition of the other teeth • dental age of the patient • the occlusal relationship Dental update 2001

5. the restorative state of the tooth

6. presence and condition of the other teeth • If any are absent, extraction of the first permanent molar in that quadrant should be avoided. • The absence of third molars does not generally contraindicate the extraction of FPMs. However, the presence of mesially directed forces from developing third molars may aid space closure. Dental update 2001

7. presence the other teeth(same quadrant) No yes

8. dental age of the patient • Ideal time to extract first molar is 8.5-10 years • Earlier extraction : second premolar have a tendency to drift distally • Delayed extraction : the second molars will show less bodily movement and more tilting Journal of dentitry Tehran university of medical sciences 2002

9. Mcdonald 2011

10. A greater degree of movement will occur in children in the 8.5 to 10 year age group radiographic evidence of early dentine calcification within the second molar root bifurcation Journal of dentitry Tehran university of medical sciences 2002

11. Dental calcification stages(Nolla)

12. Radiographs taken at 6-month intervals after the loss of a maxillary first molar Mcdonald 2011

13. After extraction of the mandibular primary teeth and first permanent molars 3.2 years after extraction of the first permanent molars

16. dental age of the patient In maxilla dental age of the patient in mandible others Permanent dentition 7-11.5 8.5-10

17. The occlusal relationship • class I • with labial segment crowding • with buccal segment crowding Dental update 2001

18. class II division 1 • class II division II • extractions in the lower arch should be avoided if at all possible in deep bite cases • class III Dental update 2001

19. class II division 1 class I labial segment crowding buccal segment crowding mandible maxilla class III class II division II mandible maxilla mandile maxilla

20. Ideal condition • presence and condition of the other teeth • class I • with buccal segment crowding • In children in the 8.5 to 10 year age group

21. Balancing and compensating extractions Compensating involves extraction of an antagonistic molar to prevent its overeruption.overeruption of the upper FPM can prevent mesial migration of the mandibular second permanent molar. Balancing involves removal of a contralateral tooth, which needn’t necessarily be a FPM, to preserve the dental midline. Dental update 2001

22. One carious first permanent molar BRITISH DENTAL JOURNAL 2001

23. One carious first permanent molar (Upper) One carious first permanent molar (lower) mandible maxilla mandible maxilla

24. Two carious first permanent molars BRITISH DENTAL JOURNAL 2001

25. Two carious first permanent molars (uppers) Two carious first permanent molars (lowers) mandible maxilla mandible maxilla One upper and one lower(different sides) mandible maxilla

26. Three carious first permanent molars BRITISH DENTAL JOURNAL 2001

27. Three carious first permanent molars Maxilla and mandible

28. Prevalence of Loss of Permanent First Molars in a Group of Romanian Children and Adolescents • Anca Maria Rãducanu, Victor Feraru Distribution of loss of permanent first molars by quadrant. OHDMBSC, 2009

29. Effects of early loss of permanent first molars on the development of third molars • Panoramic radiographs and dental casts of 165 adolescent patients (103 boys, 62 girls) with unilateral early loss of a permanent first molar were used to assess the developmental stages of the third molars. The formation stages of third molars on the extraction sides were evaluated, and the formative conditions of the contralateral teeth were used as controls. Early loss of the permanent first molars might have an accelerating effect on the development of the third molar on the extraction side compared with the contralateral teeth. Therefore, emergence of the third molars on the extraction side might be hastened, and these teeth might erupt earlier than the contralateral teeth. • (Am J OrthodDentofacialOrthop 2006)

30. Evaluation of spontaneous space closure and development of permanent dentition after extraction of hypomineralized permanent first molars BIRGITTA JÄLEVIK & MARIE MÖLLER Twenty-seven children who had one to four permanent first molars extracted due to severe MIH. Each case was followed up on individual indications 3.8–8.3 (median 5.7) years after extractions. The eruption of the permanent dentition, and space closure were documented by orthopantomograms, casts, photographs, and/or bitewings. Fifteen children were judged to have a favourable spontaneous development of their permanent dentition without any orthodontic intervention. Seven children were or should be subjected to orthodontic treatment for other reasons registered prior to the extraction. Five children were judged to have a treatment at least caused by the extractions, but three of them abstained because of no subjective treatment need. International Journal of Paediatric Dentistry 2007

31. 7.7 8.8 7,7 10.2 13.8 International Journal of Paediatric Dentistry

32. Thank You