Because porcelain goes through the extreme heat of more than 2,500 degrees Fahrenheit in a kiln, it can withstand the heat from an oven. Most ovens do not get hotter than 500 degrees Fahrenheit, so most porcelain can easily handle this. But the same rules for microwaves apply for ovens too, so any heavily-designed or decorated porcelain dishes should not go in the oven. But porcelain with metal designs or lining will be safe in the oven because metal can go in the oven, whereas it could explode in the microwave.