The aim of the present study is to test whether there is a difference in the marginal bone level change between implants with and without cantilevers.

Inclusion Criteria:

• male and female patients 18 years to 80 years of age
• no general medical condition which represents a contraindication to implant treatment
• two adjacent missing teeth in the maxilla or mandible in positions of premolars and molars
• at least one tooth present adjacent to the edentulous space
• indication for implant treatment is given
• at least 8 mm of vertical bone height in the mandible allowing for the placement of a 6 mm implant (2 mm safety distance to inferior alveolar nerve)
• at least 4 mm of vertical bone height in the maxilla
• signed informed consent after being informed

Exclusion Criteria:

• smoking of more than 15 cigarettes a day (clinical studies show an increased failure rate of implants in heavy smokers)
• poor oral hygiene after hygienic phase (Plaque Index over 30 %)
• active periodontal disease
• pregnancy or breastfeeding at date of inclusion