10- important anatomical variations

What are the 2 classifications of root canal morphology?

Vertucci- 8 types

Weine- 4

What is type 1 weine?

single canal from pulp chamber to the apex

What is type 2 Weine?

Two separate canals leve chamber but merge at canal terminus to form a single canal

What is type 3 Weine?

2 distinct canals from pulp chamber to canal terminus

What is type 4 Weine?

Single canal leaves from chamber- divides into 2 separate canals at terminus 

What might make access of a maxillary central incisor difficult?

Lingual shoulder

Calcific metamorphosis

Root bulkier than lateral

Lateral canals in middle or apical third

Dilacerations

What is calcific metamorphosis?

Response to trauma- canal space fills with hard tissue- narrow calcified- yellow discolouration 

What are dilacerations?

Sharp curve in root suggest trauma or bony interference during root formation 

What is the first cause of RCT failure in lateral incisors?

Apical curvature in DP direction- files tend to straighten so don’t instrument apical third

What 2 anomalies are found most commonly in maxillary lateral incisor?

Dens in dente/invaginatus- invagination of enamel 

Palatal groove on lingual surface

What are the 3 types of dens invaginatus that are part of Oehlers classification?

1- invagination limited to crown- not beyond CEJ

2- extends beyond CEJ, may/not communicate with pulp 

3- extends through root- no communication with pulp 

What anomaly found in mandibular lateral incisor?

Germination- one tooth bud tries to divide

Fusion- union of 2 tooth germ so single large tooth  

Count the teeth- If more teeth- germination, if less teeth- fusion

What’s this?

Germination

What’s this?

Fusion 

What are the anomalies in maxillary and mandibular canines?

2 roots and canals 

What is a rare anomaly in a maxillary 1st pm?

3 root canals 

What are common anomalies in mandibular 1st pm?

Bi or trifurcations of roots or canals 

What is a rare anomaly in mandibular 2nd pm?

2 roots

What are the 6 anomalies in maxillary 1st molar?

Single root and canal 

2 distal canals 

2 palatal roots 

Variations in anatomy 

3 MB canals

8 canals 

What are common anomalies in maxillary 2nd molar?

1 canals

Pulp stones in pulp chamber

5 roots and canals

3 MB canals

What is an anomaly in mandibular 1st molar?

3 roots- extra one called radix entomolaris 

What is an anomaly in mandibular 2nd molar?

3rd root

1 conical root with c shaped canal 

What is the classification of c shaped root canals according to melton?