Microleakage around cemented full crowns and its relationship to the dental pulp

Fifteen sound or with small restoration recently extracted mandibular first molar were collected and kept in 0.9% physiologic saline solution changed every 12 hours. All teeth were prepared with shoulder finishing line to receive full cast metal crowns. Direct wax pattern, investing, casting of these crowns with non precious alloy were prepared after investment, crowns sand blasted and cemented with glass ionomers cement according to the manufacturer's direction. The metal crown cemented on extracted tooth and put under static load of 5 kg for 20 minutes