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10 drawing of-posterior_teeth_-practical_-_4
- 1. Drawing& Carving of Posterior Permanent Teeth By Prof.Dr. Malak Soliman & Dr. Hussein El Maghraby
- 2. Drawing of the Permanent Posterior Teeth • The five aspects of each tooth are drawn on graph paper. Every measurement will be 4 times that of the natural tooth. The page will be divided into 4 equal rectangular for the buccal, lingual ,mesial &distal surfaces .A small square is drawn for the occlusal aspect. Buccal Lingual Mesial Distal Occlusal
- 3. Upper first Premolars 4 Measurements for drawing • Length of the ……… Crown 34 mm ……… Root 56 mm • Width of the …….. Crown 28 mm (Mesiodistal dimension)…Neck 20 mm • Thickness of the………Crown 36 mm (Buccolingual dimension).. Neck 32 mm • Cervical line curvature Mesially 4 mm …..Distally 0 mm
- 4. Upper first Premolars 4 Measurements for carving • Length of the ……… Crown 8.5 mm ……… Root 14 mm • Width of the …….. Crown 7 mm (Mesiodistal dimension)…Neck 5 mm • Thickness of the………Crown 9 mm (Buccolingual dimension).. Neck 8 mm • Cervical line curvature Mesially 1 mm …..Distally 0 mm
- 5. Buccal & Lingual Aspects of 4 M D 1010 34 56 10 10 •The mesial& distal outlines are slightly concave . •The mesial contact area is convex and is located at the middle third just occlusal to the crown midway 34/2 -1=16 •The distal contact area is convex and is located at the junction of the occlusal &middle thirds ( 11mm from occlusal surface, 34/3). •The mesial cusp slope is longer than the distal one. •The lingual cusp is shorter by 4mm and narrower than the buccal one. •The cusp tips are sharp and slightly distal to the central line 16 11 4 14 14
- 6. The Mesial & Distal Aspects of 4 16 16 16 16 L 18 18 B L 4 34 56 8.5 15 4 4 •The maximum convexity buccally is located at ¼ of the crown length( 8.5 m ) and lingually at crown midway( 34-4/2 = 15m ). • The lingual cusp is shorter by 4m than the buccal one. • The buccal& lingual cusp tips are apart by less than the neck thickness 32-2= 30m. • The buccal cusp tip is at one line with the apex of the buccal root. • The lingual cusp tip is at one line with the outer surface of the lingual cusp. 3o
- 7. Occlusal Aspect of 4 18 18 14 14 Occlusal aspect is hexagonal •Distobuccal arm = mesiobuccal arm •Distal arm > mesial arm •Distolingual arm> Mesiolingual arm • Buccal surface > lingual surface (lingual convergent)
- 8. Drawing of upper second premolar 5 B L M D occlusal
- 9. Lower first Premolars 4 Measurements for drawing • Length of the ……… Crown 34 mm ……… Root 56 mm • Width of the …….. Crown 28 mm (Mesiodistal dimension)…Neck 20 mm • Thickness of the………Crown 3o mm (Buccolingual dimension).. Neck 26 mm • Cervical line curvature Mesially 4 mm …..Distally 0 mm
- 10. Lower first Premolars 4 Measurements for carving • Length of the ……… Crown 8.5 mm ……… Root 14 mm • Width of the …….. Crown 7 mm (Mesiodistal dimension)…Neck 5 mm • Thickness of the………Crown 7.5 mm (Buccolingual dimension) Neck 6.5 mm • Cervical line curvature Mesially 1 mm …..Distally 0 mm
- 11. Buccal & Lingual Aspects of 4 34 56 10 10 M D •Mesial& distal contact areas are at the same level, slightly Cervical to the junction of the occlusal & middle thirds 34/3 +4 =15. • Mesial slope is shorter than the distal slope. • The cusp tip located little mesially. •The lingual cusp length is 2l3 of the buccal cusp 34x2/3=22 •Mesiolingual developmental groove at the arrow 15 1414 22
- 12. Mesial& distal aspects of 4 22 56 13 13 •Maximum convexity buccally is at ¼ the length (34/4=8.5) • Maximum convexity lingually is at ½ crown length (22/2=11) • The buccal cusp tip is at one line with the tooth bisecting line. 15 15 118.5 34
- 13. Occlusal aspect of 4 1414 20 10 The buccal cusp occupy The 2/3 occlusal aspect =20,while the lingual cusp occupy the 1/3 =10.
- 14. Lower first Premolars 5 Measurements for drawing • Length of the ……… Crown 32 mm ……… Root 58 mm • Width of the …….. Crown 28 mm (Mesiodistal dimension)…Neck 20 mm • Thickness of the………Crown 32 mm (Buccolingual dimension).. Neck 28 mm • Cervical line curvature Mesially 1 mm …..Distally 0 mm
- 15. Lower first Premolars 5 Measurements for carving • Length of the ……… Crown 8 mm ……… Root 14.5 mm • Width of the …….. Crown 7 mm (Mesiodistal dimension)…Neck 5 mm • Thickness of the………Crown 8 mm (Buccolingual dimension) Neck 7 mm • Cervical line curvature Mesially 1 mm …..Distally 0 mm
- 16. Buccal & Lingual Aspects of 5 32 58 1010 M M D14 14 4 MLDL
- 17. Mesial& distal aspects of 5 14 14 16 16 32 58 •The line bisecting the tooth reach 2 mm lingual to buccal cusp tip. • The maximum Convexity buccally at 1/4the crown length( 32/4= 8 ). The maximum Convexity lingually at ½ the crown length( 32-4/3 = 10x2=20 ). 20 8 2 B ML B ML DL
- 18. Occlusal aspect of 5 The buccal cusp occupy 2/3 -2 the crown thickness= 20 The lingual cusp= 12 1513 2012 MLDL B
- 19. Upper first Permanent molars 6 Measurements for carving • Length of the ……… Crown 7.5 mm ……. Root buccal 12 mm ……. lingual 13 mm • Width of the …….. Crown 10 mm (Mesiodistal dimension)…Neck 8 mm • Thickness of the………Crown 11 mm (Buccolingual dimension).. Neck 10 mm • Cervical line curvature Mesially 1 mm …..Distally 0 mm
- 20. Upper first Permanent molar 6 Measurements for drawing • Length of the ……… Crown 30 mm Root……. buccal 48 mm ………. lingual 52 mm • Width of the …….. Crown 40 mm (Mesiodistal dimension)…Neck 32 mm • Thickness of the………Crown 44 mm (Buccolingual dimension).. Neck 40 mm • Cervical line curvature Mesially 4 mm …..Distally 0 mm
- 21. Buccal Aspect • Mesial contact area is at the junction of occlusal & middle thirds . (30/3=10) • Distal contact area is at the middle third. (30/2=15) • The M.B & D.B cusp tips are located at20/2 from the midline 48 52 15 30
- 22. Lingual aspect 25 15 52 16 16 30 The M L cusp is larger than the D L cusp by 5 mm , The width Of the M L cusp is 25 mm & the D L Cusp is 15mm. ML DL
- 23. Mesial Aspect 48 30 52 •The maximum convexity buccally is at the cervical ¼ (30/4=7.5) lingually at the middle third ( 30/2=15) • The MB & ML cusp tips are apart from each other by little more than the half of the thickness of the crown ( 44/2 + 2=24), each cusp tip apart from the middle line by 12mm.
- 24. Distal aspect Occlusal Aspect 2222 2020 ML DL MBDB DB DL
- 25. Upper Second Molar 7 Buccal Lingual Mesial Distal Occlusal MB ML DB DL MB DB MLDL ML MB DB DL
- 26. Lower first Permanent molar 6 Measurements for drawing • Length of the ……… Crown 30 mm …………. Root 56 mm Width of the …….. Crown 44 mm (Mesiodistal dimension)…Neck 36 mm • Thickness of the………Crown 42 mm (Buccolingual dimension).. Neck 36 mm • Cervical line curvature Mesially 4 mm …..Distally 0 mm
- 27. Lower first Permanent molar 6 Measurements for carving • Length of the ……… Crown 7.5 mm ……… Root 14 mm • Width of the …….. Crown 11 mm (Mesiodistal dimension)…Neck 9 mm • Thickness of the………Crown 10.5 mm (Buccolingual dimension) Neck 9 mm • Cervical line curvature Mesially 1 mm …..Distally 0 mm
- 28. Buccal aspect •Width of the crown=44mm The MB cusp is the largest=18 The DB cusp is slightly smaller=17 The D cusp is the smallest=9 •The mesial contact area is at the junction of the occlusal &middle third 30/3=10mm from occlusal • The distal contact area is at the middle third 30/2=15mm MBDBD
- 29. Lingual Aspect Mesial Aspect The maximum Convexity buccally at ÂĽ =30/4=9.5 Lingually at midway =30/2=15mm The buccal cusp tip is 2mm buccal to the midline. The distance between The 2 cusps is little larger than the half Of the crown thickness =42/2+1=22mm 9.5 ML DL D MLMB
- 30. Distal Aspect Occlusal Aspect 44 42 MB DB D ML DL D DB MB DL ML
- 31. Buccal Lingual Mesial Distal Occlusal Lower Second Molar 7 MB DB DL ML MLMB DBDL
- 32. Thank You