dental implant sizes
Dental Implant Sizes: Diameter and Length Chart
In this article
Implant size is two numbers: the diameter of the body and its length. Together they decide how much bone the implant needs, how much surface it has for osseointegration, and which prosthetic platform you restore it with. This guide covers how sizes are grouped, how clinicians usually choose them, and the full size range of every Surcam implant line in one chart.
How dental implant diameters are grouped
There's no single industry standard, but most systems use roughly these bands:
| Category | Typical diameter | Common use |
|---|---|---|
| Narrow | about 3.0 to 3.5 mm | Lower incisors, upper lateral incisors, thin ridges |
| Standard (regular) | about 3.75 to 4.3 mm | Most premolar and many molar sites |
| Wide | about 5.0 to 6.0 mm | Molars, fresh molar sockets, low-density bone where more surface helps |
Implants under 3.0 mm are usually called mini implants. They are a separate category, mostly one-piece and often used for overdenture retention. Surcam's narrowest two-piece implant is 3.3 mm, so it belongs in the narrow band, not the mini one.
How dental implant lengths are grouped
| Category | Typical length | Notes |
|---|---|---|
| Short | 6 mm or less | Used when vertical bone is limited, e.g. near the sinus or the inferior alveolar canal, as an alternative to grafting. Surcam's U-Type comes in a 6 mm length |
| Standard | about 8 to 13 mm | The range most single-tooth cases fall into |
| Long | 14 mm and up | Dense or narrow sites that need more anchorage. Pterygoid and zygomatic implants are a separate, much longer group |
How clinicians choose implant size
A common starting point is to keep bone around the implant on every side:
- Bucco-lingual width: leave at least about 1.5 to 2 mm of bone on the buccal and lingual walls. On a 7 mm wide ridge that usually means an implant of 3.75 mm or less.
- Mesio-distal space: leave about 1.5 mm between the implant and a natural tooth, and about 3 mm between two implants.
- Vertical height: leave a safety margin above the inferior alveolar canal and below the sinus floor. CBCT planning is the norm.
- Tooth position: narrow implants for small anterior teeth, standard for premolars, wide for molars.
- Bone density: soft (D3 to D4) bone often favors a wider or more aggressive thread to reach primary stability. See Immediate Implant Placement for more on stability.
These are general planning rules. The final choice follows the clinician's assessment and the implant's instructions for use.
Surcam implant size chart
All sizes below are from Surcam's catalogs. Two-piece implants are titanium Ti-6Al-4V ELI with an SLA surface. The compressive implant is titanium grade 4.
| Implant line | Connection | Diameters (mm) | Lengths (mm) | Best known for |
|---|---|---|---|---|
| S-Type | Internal hex 2.43 | 3.3, 3.75, 4.2, 5.0, 6.0 | 8–18 (3.3: 8–13; 6.0: 8–16) | Spiral self-tapping thread for all bone types |
| C-Type | Internal hex 2.43 | 3.3, 3.75, 4.2, 5.0 | 8–18 | Parallel body, dual thread |
| C-Type Tissue Level | Internal hex 2.43 | 3.3, 3.75, 4.2 | 8–16 | One-stage surgery, 2 mm TiN collar |
| A-Type | Internal hex 2.43 | 3.5, 4.2, 5.0 | 10–20 (5.0: 10–16) | Self-drilling, for narrow ridges |
| U-Type | Internal hex 2.43 | 3.8, 4.2, 5.0 | 6, 8, 10, 11.5, 13, 16 | Bone-condensing thread for D1 to D4 bone |
| SC-Type Cortical | Internal hex 2.43 | 4.0, 5.0 | 10–20 | Deep sharp thread, extraction sites |
| LSA | Conical NP / RP | NP 3.5; RP 4.3, 5.0 | 7–15 (5.0: 7–13) | Conical connection, self-drilling |
| C-LSA | Conical RP | 4.0, 5.0 | 7–16 (5.0: 7–11.5) | Conical, parallel body |
| Compressive | One-piece | 3.0, 3.5, 4.0, 4.5, 5.0, 5.5 | 6–20 (by diameter) | Bendable neck, one-piece |
| Pterygoid | Internal hex 2.43 | 4.2 | 16–28 | Posterior maxilla, pterygoid plate |
| Zygomatic | Internal hex 2.43 | 3.5, 4.2 | 30–60 | Severely resorbed maxilla |
Diameter vs. prosthetic platform
The implant body diameter and the prosthetic platform are not the same thing. Every Surcam internal hex implant from 3.3 to 6.0 mm uses the same 2.43 mm internal hex, so one set of abutments, healing caps and impression copings fits the whole range (standard 3.75 platform, with wide 4.5 parts for wider emergence). The conical line has two platforms, NP and RP, and its parts are platform-specific. Check the platform, not just the diameter, before you order prosthetic parts. Our compatibility guide explains how.
Drilling to the right size
Each diameter has its own final drill. Following the drill sequence for the chosen size, and under-preparing slightly in soft bone, is how most clinicians control insertion torque. See How to Choose Implant Drills and the surgical kits, which cover every bone-level Surcam implant on both platforms.
FAQ
What is the most common dental implant size?
Diameters around 3.75 to 4.2 mm and lengths around 10 mm cover most single-tooth premolar and molar cases. Molars often take 4.2 to 5.0 mm.
What size implant for a molar?
Usually a wide or standard implant, roughly 4.2 to 5.0 mm in diameter (up to 6.0 mm in a wide socket), with a length that suits the available bone height.
What size implant for a front tooth?
Lower incisors and upper laterals usually take a narrow implant around 3.0 to 3.5 mm. Upper centrals often take 3.75 to 4.2 mm.
Are short implants reliable?
Short implants (around 6 mm) are a recognized option where vertical bone is limited and grafting is not wanted. Case selection and loading protocol matter more than with standard lengths.
What is the difference between a narrow implant and a mini implant?
Narrow implants are two-piece implants of about 3.0 to 3.5 mm that take regular abutments. Mini implants are under 3.0 mm and are usually one-piece.
