The nominal implant length or diameter is the length of diameter of a dental implant as written on the manufacturer’s label. When placing an implant, it is essential that a surgeon does not exceed the parameters on the label or damage could be done to the patient’s bone, soft tissues, nerves, or other oral structures. Each type of implant has its own nominal length or diameter and the practitioner should have detailed knowledge of what these parameters are prior to placing them. The nominal implant length or diameter also applies to the relationship between an abutment and an implant. The diameter of each should be checked to ensure they are the correct size. Differences in size between the implant and implant hardware could lead to implant failure or injury to the patient. Most manufacturers have made the nominal implant lengths and diameters available on their websites as well as on the packaging.