PRIMARY RETENTION FORMDefinition – Prevention of dislodgement of the restoration.Prepare wall configurations- shape, height & form● Class I- buccal and lingual wallsー converge occlusallyー or parallel- mesial and distal walls has to be divergent because dentine will be removed otherwise as dentine is the major supporter / retentive component.● Onlay ー entire cavity prep will be divergent● Class II ー create dovetail.● Q. If a caries at the Marginal ridge? How would you manage?- Prepare a conservative cavity where wall closer to the marginal ridge is divergent in order to include the caries & Other side parallel.- No need to make it as a class II preparation.- Because we always follow preservation method.Please go to Lecture 21.CONVENIENCE FORM.

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