tooth impaction

Tooth Impaction

Dental Surgery

Atheer Ahmed Abed 1330129

The university of georgia 2015/11/19

The university of georgia

DEFINITION

• IMPACTION:

• It is the tooth that has failed to erupt completely or partially to its correct position in the dental arch well beyond its eruption date and its eruption potential is lost.

COMMONLY IMPACTED TEETH

• Mandibular third molar• Maxillary third molar• Maxillary canine• Mandibular premolars• Maxillary premolars• Mandibular canine• Maxillary central incisor• Maxillary lateral incisor

CAUSES OF IMPACTION

• LOCAL CAUSES:

• Obstruction for eruption• Lack of space• Ankylosis of primary or permanent tooth• Ectopic position of tooth bud• Dilaceration of roots• Soft tissue or bony lesions

CAUSES OF IMPACTION

• SYSTEMIC CAUSES:

• Pre-natal causes: hereditary• Post-natal causes: tuberculosis,

rickets, malnutrition• Endocrinal disorders of thyroid,

parathyroid, or pituitary gland• Hereditary disorders:

osteoporosis, cleft palate

There are 3 Classification Systems

1. Angulations

2. Relationship to Anterior Border of Ramus

3. Relationship to the Occlusal Plane

CLASSIFICATION OF IMPACTED TEETH

Let’s talk about Angulation (which is 4 kinds)

• 1.The least difficult Impaction is MESIOANGULAR IMPACTION. When the crown of the mesioangular-impacted tooth is tilted toward the second molar in a mesial direction.

2. HORISONTAL IMPACTION. This type is concidered to be more difficult to remove compared with Mesioangular Impaction.

3. VERTICAL IMPACTION. When the long axis of the impacted tooth runs parallel to the long axis of the second molar.

4. DISTOANGULAR IMPACTION The most difficult angulation for removal of tooth. In this case third molar is distally or posteriorly angled away from second molar.

Second Classification System is: Relationship to Anterior Border of Ramus.

1. Pell and Gregory class 1 impaction. Means when the third molar is anterior to the anterior border of ramus.

2. Pell and Gregory class 2. When half of the crown is covered by anterior portion of the ramus of mandible.

3. Pell and Gregory Class 3 When the tooth is located completely within the mandibular ramus.

And the last, Third Classification System is: Relationship to the Occlusal Plane.

A. When Occlusal plane of the Impacted Tooth is at the same level as the occlusal plane of the second molar.

B. When occlusal plane of the impacted tooth is between the occlusal plane and the cervical line of the second molar.

C. When Impacted Tooth is below the cervical line of the second molar.

SO…Do you have any questions for me