A full single-tooth implant set, not just the screw: the titanium implant, a straight abutment, the small
abutment screw that holds it in, and a molar crown on top. Each part is its own object and they really fit:
the abutment's hex sits in the implant's hex, and the screw thread matches the thread inside the implant.

Implant: 3.72 x 11.45 mm, tapered body, 0.67 mm thread, polished collar, three cutting flutes at the tip.
Abutment: 4.64 mm collar, tapered post with a flat so the crown can't rotate, screw channel inside.
Crown: 10.0 x 10.6 mm, 9 mm tall, four cusps.

You get it assembled and also laid out "exploded" in a second .blend, handy for patient explanations.
82,784 quads in total, no triangles, every part closed. The implant has 2K x 4K PBR textures
(blasted thread vs polished collar); abutment, screw and crown use simple PBR materials.

Units are millimetres (the scene is in metres). No lights, cameras or helper objects in the files. Rendered in Blender Cycles.

FILES
dental_implant.blend (Blender 4.4, native, assembled)
dental_implant_exploded.blend (Blender 4.4, exploded layout)
dental_implant.fbx (textures referenced from /textures)
dental_implant.obj + .mtl
dental_implant.glb (textures embedded)
dental_implant.stl (for 3D printing / visualisation)
textures/T_DentalImplant_BaseColor.png
textures/T_DentalImplant_Roughness.png
textures/T_DentalImplant_Normal.png