The retention of a complete denture differs significantly between the upper and lower jaw — this is due to fundamentally different anatomical conditions.
Upper jaw denture: The palatal plate covers the entire hard palate, creating a large bearing surface. The suction effect between the denture and the palatal mucosa means the upper denture usually sits very securely — often even without any adhesive cream. The broad support distributes chewing forces evenly.
Lower jaw denture: In the lower jaw, the palatal surface is absent as a suction base. Instead, the tongue, floor of the mouth, and the mobile cheek mucosa significantly limit the available space. The bearing surface is much smaller, and constant tongue movement can destabilise the denture. For this reason, a lower denture almost always sits less firmly than an upper denture.
Why implants are especially beneficial in the lower jaw: Due to these anatomical challenges, lower jaw complete dentures benefit particularly from implant-supported retention. As few as two implants with locator or ball attachments can dramatically improve retention and fundamentally change the wearing experience.
