🌟 PERIO-PROSTHO RELATIONSHIP

📌 POINTS TO PONDER

🔹Crown-lengthening surgery is the surgical procedure which exposes adequate clinical crown to prevent the  placement of the crown margin into the area of the biologic width. 

🔹Biologic width is defined as the dimension of healthy gingival tissue, which is attached to the tooth coronal to the crest of the alveolar bone.

📌 VIVA VOCE

Q1. What is the dimension of biologic width?

Ans. Connective tissue attachment of 1.07 mm and 0.97 mm of junctional epithelium makes total biologic width of 2.04 mm. 

Q2. What should be the distance between the apical extension of restoration and crest of the alveolar bone?

Ans. Atleast 3 mm.

Q3. What are the Thumb rules for placing intracrevicular margins?

Ans.

🔸If the gingival sulcus is 1.5 mm or less, place the restoration margin 0.5 mm below the gingival tissue crest.

🔸If the gingival sulcus is between 1.5- 2 mm, place the margin one half the depth of the sulcus below the gingival tissue crest.

🔸If the gingival sulcus is greater than 2 mm, do crown lengthening procedure (gingivectomy) to create a 1.5-mm sulcus. Then place the restoration margin 0.5 mm below the gingival tissue crest.

Q4. Name various preprosthetic periodontal surgeries.

Ans. Crown-lengthening surgery; correction of deformed ridges and ridge augmentation.

Q5. Name various methods for crown lengthening.

Ans. Gingivectomy; Apically Positioned Flap Surgery; Apically Positioned Flap Surgery with Osseous reduction and forced tooth eruption.

Q6. What are the various pontic designs?

Ans. Sanitary, ridge-lap, modified ridge-lap and ovate pontic designs.

Q7. Which toothbrushing technique is helpful in cleaning the gingival surface of the pontic from the facial aspect?

Ans. Charters toothbrushing technique.

Q8. Which interdental aid is used for cleaning the under surface of fixed prosthesis?

Ans. Super floss.

Q9. What are the indications for crown-lengthening surgery?

Ans. Subgingival caries or fracture; inadequate clinical crown length for retention; unequal or unesthetic gingival height.

Q10. Which brush is used for cleaning removable prosthesis?

Ans. Special denture brush.

📌 MCQs

💡Average biologic width is approx.

A. 2.04 mm

B. 3 mm

C. 0.15 mm

D. 3.5 mm

Answer : A

💡Super floss are used for cleaning

A. Under surface of fixed prosthesis

B. Removable prosthesis

C. Implant

D. None of the above

Answer : A

💡The least distance between the apical extension of restoration and crest of the alveolar bone

A. 3 mm

B. 4 mm

C. 6 mm

D. 1 mm

Answer : A

💡How much time after periodontal plastic surgery, the restoration can be placed

A. 3 months 

B. 2 months

C. 6 months 

D. 9 months

Answer : B

💡The tooth preparations are needed to be extended into gingival sulcus due to

A. Esthetics in maxillary anterior region

B. Extensive carious lesions

C. Replacement of defective and extensive restoration

D. All of the above

Answer : D