Active vs. Passive Eruption Active Eruption Active eruption is known as eruption of teeth into the mouth towards the occlusal plane. This is a natural path of eruption of all the teeth as they emerge from gingiva and continue erupting until they make contact with the opposing tooth. Passive Eruption Passive eruption is known as movement of the gingiva apically or away from the crown of the tooth to the level of Cementoenamel junction (CEJ) after the tooth has erupted completely. Problems in gingival tissue migrating apically can give rise to what is known as Altered or Delayed passive eruption. In this phenomenon, the gingival tissues fail to move apically and thus lead to shorter clinical crowns with more square-shaped teeth and appearance of what is known as Gummy smile. Coslet Classification Coslet et al. classified delayed passive eruption into two types which related the bone crest of a tooth to the Mucogingival junction (MGJ) of that tooth. These two groups were further divided based on the position of the alveolar bone crest to the cementoenamel junction. Type Osseous crest levelAttached gingival levelGingival margin levelTreatment Type 1aApical to CEJAdequateIncisal to CEJGingivectomy Type 1bAt CEJAdequate Incisal to CEJGingivectomy and osseous surgeryType 2aApical to CEJInadequateIncisal to CEJApically positioned flap Type 2bAt CEJInadequate Incisal to CEJApically positioned flap and osseous surgery
Active vs. Passive eruption Active eruption Active eruption is known as eruption of teeth into the mouth towards the occlusal plane. This is a natural path of eruption of all the teeth as they emerge from gingiva and continue erupting until they make contact with the opposing tooth. Passive eruption Passive eruption is known as movement of the gingiva apically or away from the crown of the tooth to the level of Cementoenamel junction (CEJ) after the tooth has erupted completely. Problems in gingival tissue migrating apically can give rise to what is known as altered or delayed passive eruption. In this phenomenon, the gingival tissues fail to move apically and thus lead to shorter clinical crowns with more square-shaped teeth and appearance of what is known as gummy smile. Coslet classification Coslet et al. classified delayed passive eruption into two types which related the bone crest of a tooth to the Mucogingival junction (MGJ) of that tooth. These two groups were further divided based on the position of the alveolar bone crest to the cementoenamel junction. Type Osseous crest levelAttached gingival levelGingival margin levelTreatment Type 1aApical to CEJAdequateIncisal to CEJGingivectomy Type 1bAt CEJAdequate Incisal to CEJGingivectomy and osseous surgeryType 2aApical to CEJInadequateIncisal to CEJApically positioned flap Type 2bAt CEJInadequate Incisal to CEJApically positioned flap and osseous surgery
R
Eruption
eruption
R
Eruption
eruption
R
Eruption
eruption
R
Altered or Delayed
altered or delayed
R
Gummy
gummy
R
Classification
classification