Indications The smooth neck section of Straumann Standard Plius Implants is 1 mm shorter than with Straumann Standard Implants. Standard Plius Implants are particularly suitable for use in the esthetic region. The implant site should allow the shoulder of the implant (crown margin) to be positioned 1 – 2 mm apical to the neighboring CEJ (cementoenamel junction). Standard Plius Implants diameter 3.3 mm, RN have the same indications as Standard Implants diameter 3.3 mm RN. Important: As a rule of thumb, always use the largest possible implant diameter.