Three factors substantially influence retention:

• The higher the prepared tooth, the stronger the retention. The height of the prepared tooth must measure at least 4 mm.
• The ideal preparation angle is between 4 – 8°. A wider angle considerably reduces retention.
• The larger the circumference of the prepared tooth, the larger the adhesion surface and the stronger the retention of the restoration.

Three factors substantially influence retention:

• The higher the prepared tooth, the stronger the retention. The height of the prepared tooth must measure at least 4 mm.
• The ideal preparation angle is between 4 – 8°. A wider angle considerably reduces retention.
• The larger the circumference of the prepared tooth, the larger the adhesion surface and the stronger the retention of the restoration.