Schulge (1987) classification, teeth falls into 5 categories according to the location of the tubercles 
Tubercle on the inclined plane of the lingual cusp
Cone-like enlargement of the buccal cusp
Tubercle on the inclined plane of the buccal cusp
Tubercle arising from the occlusal surface obliterating the central groove
Laus classification, divide teeth into groups according to their anatomical shapeSmooth
Grooved
Terraced
Ridged
Oehlers classification, teeth categorized depending on the pulp contents within the tubercle (histological appearance of the pulps were examined)Wide pulp horns (34%)
Narrow pulp horns (22%)
Constricted pulp horns (14%)
Isolated pulp horn remnants (20%)
No pulp horn (10%)
Hattab et al. classificationAnterior teeth
Type 1 - Talon, a well defined additional cusp that projects palatally and extends at least half the distance from the cementoenamel junction (CEJ) to the incisal edge
Type 2 - Semitalon, an additional cusp that extends less than half the distance from the CEJ to the incisal edge
Type 3 - Trace talon, prominent cingula
Posterior teeth
Occlusal DE
Buccal DE
Palatal DE/ Lingual DE

Management
If the tooth involved is asymptomatic or small, no treatment is needed  and a preventative approach should be taken. Preventative measures include:

Oral hygiene instruction
Scaling and polishing
Application of topical fluoride on reduced cusp
Application of fissure sealant
Frequent dental check-up, pay extra attention to fissures
Perform direct or indirect pulp capping in cases with pulpal extension, to try increase the rate of reparative dentin formation (but may result in obliteration of the canal)
Seal exposed dentin with microhybrid acid-etched flowable light-cured resin
Perform pulpotomy with MTA using a modified Cvek techniqueFor teeth with normal pulp and mature apex, reduce the opposing occluding tooth.
It often results in severe intrauterine growth restriction which can lead to miscarriage or stillbirth. Overall perinatal mortality rate is high: 41% to 77%. Recurrence rate is also high: 67% to 100%. See also
Chorioamnionitis

References
External links
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