مدرس المادة
Complex posterior restorations are indicated when tooth structure is missing due to cusp fracture, severe caries lesion development (two or more tooth surfaces are missing), and more retention and resistance forms are needed, or replacement of existing restorative material is necessary. To compensate the lost tooth structure, may be moderate, severe or total, one or more than one retentive device is utilized. The routinely used retentive devices are: i. Slots. ii. Locks. iii. Coves. iv. Cusp Coverage Complex Amalgams. v. Crown lengthening. vi. Pins. vii. Amalgam pin. viii. Bonded Amalgam System...........
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