root divisions and surfaces of tooth

the following picture is what?

2 furcation two shapes, col and pyramidal

• col is a valley like depression that connects a facial and lingual papilla

how many teeth be divided?

by the number of roots they contain

the following picture is what?

single rooted teeth

the following picture is what?

multirooted teeth

the highlighted portion is what?

the root trunk, which is the undivided portion of the root. it starts from the cementoenamel junction into the furcation area

the root may be:

single, as in anterior teeth and premolars except for the upper 4 (1st premolar)

the root may be:

double roots, as in upper 4 (1st premolar) and lower molars

the root may be:

triple, as in upper molars

what is the region highlighted in blue?

the region of a multirooted tooth where the root divides. there is two:

1. bifurcation

2. trifurcation

the following line is pointing at what?

• it refers to the anatomical area in between the roots of multirooted tooth, in this case, two roots.

• found in the roots of the:

  • first premolar

  • mandibular permanent and deciduous molars

the following line is pointing at what?

refers to the anatomical area in between the roots of the premolar or molar.

what are the 3 sites of junction in tooth tissues?

1. Cemento-enamel junction (CEJ)

2. dentino-enamel junction (DEJ)

3. dentino-cemental junction (DCJ)

What are the surfaces of teeth identified by?

the relationship to surrounding orofacial structures

how many surfaces does each tooth have? what are they?

• each tooth has 5 surfaces, which are:

  1. facial

  2. lingual / palatal surfaces

  3. mesial and

  4. distal (proximal)

  5. functioning surfaces (incisal) occlusal

how many parts is the facial surface divided into?

two, which are:

1. labial surface, (the outside surface of anterior teeth facing the lip)

2. buccal surface, (the outside surface of posterior teeth facing cheeks, or the buccinator muscles)

the teeth highlighted in green are what surface?

the labial surface, which is the surface of the anterior teeth

the teeth highlighted in blue are what surface?

the buccal surface, which is the facial surface of the posterior teeth

what are the lingual / palatal surfaces?

the inner surface of teeth facing the tongue or the palate

the red line is pointing to what surface?

the lingual surface, which faces the tongue

the red lines are pointing to what surface?

the palatal surfaces, which face the palatal

what are the proximal surfaces spilt into?

1. mesial (towards midline)

2. distal (away from midline)

   • collectively called proximal surfaces

what direction is the arrow pointing to?

towards the midline, so mesial surface

what direction is the arrow pointing to?

away from the midline, so distal surface

what are the masticatory surfaces?

• incisal surface

• occlusal surface

what is the arrow pointing to?

incisal surface, which is the biting surface of anterior teeth

what is the arrow pointing to?

occlusal surface, which is the chewing surface of posterior teeth

what are the functioning surfaces?

chewing/biting surfaces of the teeth, also known as masticatory surfaces of the teeth

what is the red line pointing to?

what is the blue line pointing to?

red: incisal surface

blue: occlusal surface