Anatomy + Morphology + Outline - Maxillary central to canine

Max Central - Root:Canal

1:1

Max central - Pulp horn (newly erupted) + pulp chamber

• 3 pulp horns.

• Pulp chamber wider MD than BL

Max central - General anatomy

• Root canal at CEJ triangular in young teeth, oval in older. Becomes more oval when it reaches apical foramen.

• Multiple canals rare, lateral canals common.

• Lingual shoulder present → removal for access of lingual wall of root canal.

• Lingual shoulder prevents direct access to root canal, deflects files labially => Ledge/perforation.

Maxillary central - Outline & Root curvature

• Root curvature: Straight (common), labial (less common) & distal (not common at all) 

Max central - outline access

• External access is rounded triangle w/ base towards incisal aspect. 

• Width of triangle determined bu distanse b/w M&D pulp horns. 

• Lingual shoulder removed = entire orific seen in access opening. 

• Ouline form changes to more oval shape as one gets older. 

—> Die to M&D pulp horns less prominant. 

Max Lateral

• 1:1 (can have 2-3 canals → RARE)

• No pulp horns present. 

• Pulp chamber wider MD than bl. 

Max lateral - Cross section

• CEJ shows pulp chamber centered in root. 

• Shaoe triangular, oval or round. 

• From CEJ pulp canal becomes round in midroot & apical areas. 

• Lingual shoulder of dentin removed b4 instrument can explore canal.

• Root curvature (common to least common) → Distal, straight, distolingual.

Max Lateral - outline form

• Rounded triangle/oval → depends on prominand of M&D pulp horns.

• If M&D horns access outline is triangle, if not prominent = oval.

• Pulp horns prominent: triangle shape compressed mesiodistallt kinda like centrals making slender triangle.

Max Canine - Overview

• 1:1

• Canals wider LL than MD. 

• NO PULP HORNS, small pointed incisal edge = single cusp. 

• Outline at CEJ oval.

• Lingual shoulder present → prevents shaping/cleaning of root in ling. dimension. 

• Remains oval until reaching apical 3rd og root → constriction. 

• Oval shape = circumferentially file labially & palatally → shape & clean canal properly. 

• Buccal bone pver canine eminence → desinegrates

• Fenestration is occasional finding. 

• IMPORTANT: Acute length determination. 

Max canine - Outline form

• Root curvature (common to least common): Distal, straight, labial. 

• Ext. axess out.form → oval (bcuz no M&D pulp horns).

• MD width is determined by MD width of pulp cgamber.

• Incisogingival dimen. det. by straight-line access factors & removal of lingual shoulder. 

• Incisal extention approaches within 2-3mm of incisal edge => straight line access. 

• Root curvature - labial/DL