Implant Size for mandibular right lateral incisor?

To answer your question would require an x-ray and measurements of the ridge and interproximal space for starters.

measure the mesial distal space at the cervical for the teeth and subtract 4mm (2mm between implant and tooth on each side) that will give you what will fit. so if you have 7mm then your looking at a mini implant to have a 3.5mm wide small diam you need at least 8mm space

I would say 3.25 is my usual but depending on the case you may get a 3.75. But the issue us never the implant diameter , it is always the prosthetic platform emergence profile. Choose an implant that has narrow platform and hopefuly a concave emergence profile.

The appropriate type of Implant (Size) to replace a Mandibular right lateral incisor will be case dependant. You could use some generalizations based on the the anatomical location i.e.. low load area, therefore Narrow Diameter Implants can be used but you need a lot more information to make the decision on what you will place. Both your medial / Distal and your Buccal / Lingual bone dimensions, not to mention your anatomy in this are (lingual artery etc) Would also be good to know the gingival biotype and soft tissue condition. and if the patient has any habits (i.e.: bruxism etc) If conditions are "ideal" (depending on what you are considering as Ideal) say, Type A, D1-D2 bone condition, no recession or perio concerns with no traumatic habits, canine disclusion, etc, then you are more than likely looking at a Narrow Implant in the 3mm range. The appropriate type of Implant will be the one that provides the patient with the desired result and one that allows for a successful long term function without bone loss or recession.

The comment above that is most correct for your particular situation is the one by Stan. Unless you know the labio-palatal dimension, it makes no difference if you have 5 mm or 10 mm between the central and cuspid. I have seen numerous cases where there was apparently adequate room for a 3.5 or 4 mm implant when looking from the labial, but only 1 or 2 mm of available bone for an implant when evaluating from the cross sectional view. The point is, one can not generalize about the size implant for any position until proper clinical and radiographic examination has been accomplished.

Labio-lingual, not labio-palatal.

Anyone able to share their experience of mini implant useage in confined space? I see quite a few colleagues actually advertising paying courses in the use of minimal diameter implants pretty much everywhere....

I almost always use a mini implant to replace mandibular incisors. Please check out the online info from Dr. Shakin and others. I have been using various narrow diameter ( less than 3mm ) for over 15 years with very high success. You must attend a course for the particular mini implant that you intend to use. The placement and restorative protocol is different than that for the larger diameter implants and failure to closely follow it will result in almost 100% failure rate. Closely follow it and see almost 100% success rate. Do not use a mini implant to replace a cuspid unless it is splinted to others.

G Kurtzman gave a post with a formula to calculate implant size allowing 2 mm of bone to the m and d of the implant body. Many times you get into the use of smaller diameter implants ie 3.5mm or less. Implant Direct makes a 3.00 mm dia implant with internally hexed attachments. A smaller is a one piece 2.8 dia, however placement is more critical.

I have seen a technique using a splint model to construct a guide. The sectioned model gives a cross section of the bone, one drills the correct angulation axis , use d.i.y drill bit matching osteotomy drill size, fit guide tube over same and make vacuum stent. Cory Glen in the U.S did this approach for years before he bought a CT scan. Anybody got any thoughts on this approach? I realize it takes some time to make , but I see many Youtube videos where the dentist either uses no guide at all, or uses a silicon index on the labial of the arch as a guide to placement.