PROBLEM IN IMPLANT CASTING

[Freakin teeth]

Do not think it's a expansion issue but a strength of investment against mass of molten metal entering mold/cavity it is breaking off prep/abutment when entering from one side try a secondary sprue to even the rush of metal into cavity one on buccal & one on lingual from runner bar

 

[anil patel]

do you put the ring in at 0 or 500?

no i keep ring from room tem,

 

[anil patel]

i am using bego belavest sh investment ,


thanks

 

[adl]

i am using bego belavest sh investment ,


thanks

Never use belavest sh. Too much expansion . If you use Bego investment go to belavest T ,the red ones.long burnout of course

 

[aqdental]

i am using bego belavest sh investment ,


thanks

Are you doing a multi stage burnout? Most plastic expand when heated which can cause investment breakdown especially if abutments are narrow. Also when alloy fills the cavity, if you use a high density one, can break off thin abutments. You can slow down the torque on your casting machine and avoid spruing those areas in such way that molten alloy doesn't hit any delicate part.

 

[SiKBOY]

I put all my cast on's in a cold furnace and take up to casting temp and hold for an hour before casting. If it's a thin coping, I don't risk it. I thicken up my wax work and then cast it. I'll thin it out when I grind my metal work.