M4 - Introduction to Biologic Principle of Tooth Preparation M4 - Lesson 1 Intraoral and Extraoral Structures Associated with Fixed Restorations M4 - Lesson 2 Preservation of the Vitality of Oral Structures, TMJ and Oral Musculature

Procedures involving the living dental tissues must be carefully executed so that unnecessary damages are avoided.

      If poor preparation leads to inadequate marginal fit or deficient crown contour, plaque control around fixed restorations will become more difficult and this, in turn, will impede the long-term maintenance of dental health.

     Thus, in Prosthodontics, the biological aspects of the procedures are very important if duration and long-term success for the restoration or appliance as well as the comfort of the patients are concerned.

 

biological principle

• preservation of the periodontium

• conservation of tooth structure

• protection of TMJ and muscles

• cleansable areas of margin

• avoidance of over contoured restoration

• achievement of harmonious occlusion

• protection of tooth against fracture

BIOLOGIC PRINCIPLES OF TOOTH PREPARATION

• This affects the health of the oral tissues (hard and soft tissues) and is concerned with the preservation of the vitality of the remaining tissue structures (the tooth structures, gingiva, cementum, alveolar bone, TMJ and muscles)

Tissues/ structures affected

• alveolar bone

• opposing teeth

• involved tooth

• cementum

• PDL

• TMJ

• Muscles of the head and neck

During tooth preparation, there are circumstances that we accidentally violate the biologic principle that may do harm or affect the health of the tooth and its supporting structures.

Some situations that violates the biologic principle:

1. Faulty preparation of tooth

2. Improper gingival management technique

3. Poor fitting of temporary crowns/final restoration

4. Inadequate caries removal

5. Chemical and mechanical irritation

6. Incorrect final restoration

7. Non-removal of excess luting cements

8. Use of acidic luting cements on vital teeth