Criteria

Reasons

Source

Surrounded by bone of uniform volume and

density, with a minimum bone thickness of >1 mm around the implant body

to provide good support against

multidirectional long-term loading

[18]

Placed in the geometric centre of the crown

to reduce off-axis loading

[19]

a minimum distance of 1 - 1.5 mm between the implant surface and adjacent teeth or 3 mm in the case of an adjacent natural tooth

to minimize the potential for damage to the supporting structures

[20]

a minimum interimplant distance of 3 mm

to prevent bone resorption between

adjacent implants

[21]

a 2 mm distance as a safety zone between the implant and the nerve

to avoid nerve injury during

mandibular implant surgery. In the case of placing any implant anterior to the mental foramen that is deeper than the safety zone, the mental foramen must be explored for an anterior loop

[22]

bone grafting, and other procedures, presurgical CT examinations should routinely be

performed

to avoid the risk of surgical

complications during implant

placement

[23]

CT should be used to verify the presence of the mandibular lingual vascular canal

to evaluate the lingual cortical bone thickness and density, to avoid perforations and life-threatening

bleeding

[24]

Multiple implants should be placed in parallel,

to avoid unfavourable off-axis loading

[25]