gtc 7 - cementation (ppsg lectures)

7/28/2019 Gtc 7 - Cementation (Ppsg Lectures)

1/13


2/13

CEMENTATION

There are several types of cement availablefor the permanent retention of indirectrestorations

These include zinc phospate, zincsilicophospate, polycarboxylate (zincpolyacrylate), glass ionomer, and compositeresin cements.

Cement based on zinc oxide and eugenolare not indicated for permanentcementation


3/13

Cementation With Zinc Phospate Cement

The quadrant containing the tooth being restoredis isolated with cotton rolls and suction device

Use the spatula to divide the powder into smallincrements approximately 3 mm on a side.

Move one increment across the slab andincorporated it into the liquid, mixing it for 20seconds across a wide area

Continue to add small increment of powder,mixing each for 10 to 20 seconds using a circularmotion and covering a wide area of the slab.


4/13

Mandibular isolation with a Svedopter

and cotton rolls.

Small increments of powder are introduced into the liquid.

Cement is mixed with a circular motion over a wide area.


5/13

Check the consistency by slowly lifting the

spatula.

When the consistency is right, it will string

out about 10 mm between the spatula and

slab before it runs back onto the slab.

Quickly load the clean, dry restoration with

cement.

Brush or wipe cement on the inner surfaces

of the restoration.


6/13


7/13

Seat the restoration on the tooth and, if itposterior tooth with uniform occlusion,have the patient apply force to the occlusalsurface of the restoration by closing on a

plastic wafer or orangewood. Anterior crowns are better to apply force

with a finger padded by a cotton roll.

After the restoration is completely seated,keep the field dry untill the cement hashardened.


8/13

While the cement hardens, the patient maintains pressure

by bitting on a resilient plastic wafer (A) or a wooden

stick (B).


9/13

Kegagalan gtc

Kegagalan penyemenan

Karies servikal

Poket periodontal Konektor patah

Facing pecah

Pulpitis Perubahan warna


10/13

Kegagalan penyemenan

Waktu pengadukan

Kedaluwarsa

Rasio bubuk dan cairan

Terlalu sedikit

Karies servikal

Karies pada gigipegangan

Batas crown terbuka

crown terlalu besar


11/13

Poket periodontal

Iritasi batas crown

Over loading

Iritasi sisa makanan

Konektor patah

Over loadingDesain gtc

Kualitas bahan

bruxism


12/13

Facing patah

Kualitas bahan

Ketebalan preparasi

Trauma Pulpitis

Preparasi terlalu dekat pulpa

Karies awal

Iritasi semen


13/13

Perubahan warna

Kualitas bahan

Jenis makanan

Jenis minuman Ketebalan bahan

kebocoran

gtc 7 - cementation (ppsg lectures)

Documents