SA Versus SOI Surfaces for Single Implant-supported Crown

Inclusion Criteria:

• Any partially edentulous subject requiring at least two single (preferablenon-adjacent) implant-supported crowns, being at least 18 year old and able to sign aninformed consent will be screened for eligibility. Bone volumes should allow theplacement of two implants at least 8.5 mm (maximum 10 mm) long and 4.5 mm (minimum 3.5mm) wide, with a minimal insertion torque of 30 Ncm. Implants can be placed inprevious post-extractive socket or in augmented bone, if at least 4 to 6 months havepassed from the extraction or from augmentation procedures.

Exclusion Criteria:

• Patients unable to commit to 5 years follow-up.

• General contraindications to implant surgery.

• Less then 4 mm of keratinised gingiva crestally (at the implant sites).

• Immune-suppressed/compromised patients.

• Patients irradiated in the head and/or neck.

• Uncontrolled diabetes.

• Pregnancy or lactation.

• Untreated periodontal disease.

• Poor oral hygiene and motivation (full mouth bleeding and full mouth plaque indexhigher than 25%).

• Addiction to alcohol or drugs.

• Psychiatric problems and/or unrealistic expectations.

• Patients with an acute infection or suppuration in the site intended for implantplacement.

• Patients needing any form of tissue augmentation at implant placement.

• Immediate post-extractive implants (implants can be placed after a 3-month healingperiod).

• Patients treated or under treatment with intravenous amino-bisphosphonates.

• Patients referred only for implant placement if the follow-up cannot be done at thetreatment center.

• Patients participating in other studies, if the present protocol could not be fullyadhered to.