Class I #30 Example 3

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The Walls and Margins Need Completion: Walls or margins are severely rough, with a cavity preparation that is severely ill-defined, particularly in the distal lingual area. Retention Is Moderately Deficient: The retention of the restoration is only moderately deficient, indicating some potential for stability but also room for improvement. External Outline Form Shows Moderate Underextension: The external outline form shows moderate underextension, with an isthmus variation measuring between 1.5-1.9 millimeters. Internal Outline Form Exhibits Undulation and Inadequate Depth: The internal outline form exhibits undulation, with the floor of the restoration not parallel to the walls and deviating by less than 0.5 millimeters from its ideal depth.