One-piece (monoblock) dental implants: pros, cons and when they are used
One-piece dental implants, also known as monoblock implants or single-piece implants, are made as a single unit: the part that integrates with the bone and the abutment that holds the crown are one solid piece. A conventional two-piece implant has a separate abutment, fixed to the implant with a screw.
That design detail has practical consequences. It removes the joint between components, but it also means the direction of the future tooth is decided in surgery, almost permanently. This is why some clinics present one-piece implants as the quickest option and others do not use them at all. Neither view reflects the evidence particularly well.
Pros and cons of one-piece implants at a glance
| Advantages | Disadvantages |
|---|---|
| No abutment screw that can loosen | Little scope to correct the angle of the tooth |
| No microgap between implant and abutment | The abutment is exposed to forces from day one, while the bone heals |
| Fewer prosthetic components | The abutment cannot be replaced if the prosthesis needs to change |
| Very narrow diameters for tight spaces | Several implants must be placed almost perfectly parallel |
| A temporary tooth can often be fitted the same day if stability allows | Fewer long-term follow-up studies than two-piece implants |
In practical terms, a monoblock implant works well when the anatomy allows it to be placed exactly where the tooth needs to be. When the implant has to be angled or the position compensated, a two-piece implant is usually more predictable.
What is a one-piece implant?
Two terms are often mixed up, and it is worth separating them:
- One-piece describes the design: the implant and abutment are a single unit, and the abutment sits above the gum from the first day.
- Single-stage describes the surgery: treatment is completed in one procedure, without a second operation to uncover the implant.
A one-piece implant is always placed in a single stage, because it cannot be left buried under the gum. The reverse is not true: a two-piece implant can also be placed in a single stage, with a healing abutment or with immediate loading. Claims that only monoblock implants allow “one procedure” or “teeth in a day” attribute to the design something that depends on surgical technique and on the stability achieved in each case.
The concept is not new either. One-piece titanium screw implants were developed in the 1960s, before the two-piece system became the standard. What has changed is surface treatment, thread design and digital planning, which now provides the precision this design depends on.
Most one-piece implants are titanium, but many zirconia implants are also made as a single unit, because ceramic tolerates screwed connections less well. Patients looking for a metal-free implant are often, without realising it, considering a one-piece design.
One-piece vs two-piece implants
Two-piece implants consist of the implant, which integrates with the bone, and an abutment screwed on top. They are the most widely used dental implants and have the longest clinical track record.
| Feature | One-piece (monoblock) | Two-piece |
|---|---|---|
| Structure | Implant and abutment in a single unit | Separate implant and abutment, joined by a screw |
| Correcting the angle | Very limited; the abutment itself is sometimes reshaped | Wide range, with angled or custom abutments |
| Healing | Always exposed in the mouth | Submerged or exposed, as needed |
| Future changes to the prosthesis | Difficult: the abutment cannot be swapped | The abutment can be changed without touching the implant |
The genuine advantages of monoblock implants
- No abutment screw. Screw loosening is a typical mechanical complication of two-piece implants. It cannot happen with a single unit.
- No microgap. A two-piece implant leaves a microscopic space between implant and abutment where bacteria can collect. A monoblock implant does not have one.
- Fewer components. This simplifies the prosthetic stage when the implant is in the right position.
- Narrow diameters. Useful in small spaces, such as the lower front teeth, or on thin ridges where grafting is best avoided. They do not replace bone regeneration when there is not enough bone to support the load.
Common claims that are not proven
- “They are placed without cutting the gum and without pain.” Flapless surgery is possible with both one-piece and two-piece implants, and only when the bone and gum allow it.
- “They avoid bone grafts.” If there is not enough bone to place the implant where the tooth belongs, the implant design cannot compensate.
- “They dramatically reduce peri-implantitis.” The absence of a microgap is a reasonable theoretical advantage, but it has not been conclusively shown that monoblock implants have less peri-implantitis than a well-placed, well-maintained two-piece implant.
- “They are only for patients with no bone.” Suitability depends on the geometry of the case, not just on the amount of bone.
Disadvantages of one-piece implants
The central limitation is that the abutment ends up wherever the implant ends up. Almost everything else follows from that:
- Little room for correction. If the bone forces the implant to be angled, the crown will be angled too. With a two-piece implant, an angled abutment would compensate.
- Parallel placement. For a bridge to fit, the abutments must be almost parallel. With a single unit, that requires very precise or guided surgery.
- Loading during healing. The abutment is exposed to the tongue, cheek and chewing while the bone integrates. It must be protected with a well-adjusted temporary crown or splinted to other implants.
- Aesthetics at the front of the mouth. With thin gums, there is less scope to shape the gum contour than with a custom abutment.
- Future repairs. If the type of prosthesis needs to change years later, the abutment cannot be replaced.
When they may be suitable, and when not
One-piece implants may be considered in narrow spaces, especially lower incisors or upper lateral incisors; in full-arch rehabilitations with immediate loading, where the implants are splinted together on the same day; and in patients who want a ceramic implant and accept the planning requirements that come with it.
A two-piece implant is usually the better choice when the bone requires a marked angle, for a single implant in the aesthetic zone with thin gums, in patients who clench or grind heavily, or when the prosthesis is likely to need changing over time.
How they are placed
- CBCT scan and intraoral scan, so the position of the tooth is planned first and the implant position follows from it.
- Surgery, often guided, using a surgical guide printed from the digital plan. Local anaesthetic and, if needed, conscious sedation.
- Immediate protection of the abutment with a temporary crown kept out of the bite or splinted to other implants.
- Osseointegration and check-ups, usually two to four months depending on the area and bone quality.
- Final prosthesis and maintenance, with regular reviews.
If your priority is fixed teeth from the first day, immediate load dental implants can be carried out with either one-piece or two-piece implants.
Cost of one-piece implants
There is no fixed price for a monoblock implant that can be given without assessing the case. The quote mainly depends on the number of implants, the type of prosthesis, whether guided surgery is used, whether immediate loading is planned and whether bone regeneration is needed. Saying that one-piece implants are generally more, or less, expensive than two-piece implants does not hold up: it depends on the system and the full treatment plan. After the assessment, you receive a closed quote covering every stage.
Reading reviews of monoblock implants
Patient reviews describe the experience, but they rarely tell you whether the implant was the right choice or how it looks ten years on. It is more useful to ask at your consultation:
- Why a one-piece implant in my case rather than a two-piece one?
- Does my bone allow it to be placed where the tooth belongs without angling it?
- How will it be protected while it heals?
- What happens if the prosthesis needs changing in a few years?
Alternatives
- Conventional two-piece implant, the most versatile option with the longest follow-up.
- Bone regeneration when there is not enough volume to place the implant where the tooth should be. Find out more about dental bone loss.
- Zygomatic or pterygoid implants for severe bone loss in the upper jaw, covered in our page on dental implants with insufficient bone.
Frequently asked questions
Are monoblock implants better than two-piece implants?
Not as a general rule. They have mechanical advantages, such as no screw and no microgap, but less room for correction. They are the best option only when the anatomy and the prosthetic plan fit those limitations.
Will I have a fixed tooth on the same day?
A temporary tooth is often fitted on the day, because the abutment is already in place. It depends on the stability achieved during surgery, exactly as with a two-piece implant.
Are one-piece implants suitable if I have little bone?
Narrow diameters can avoid a graft on some thin ridges. If the bone does not allow the implant to be placed where the tooth belongs, the design does not solve the problem.
How long do monoblock implants last?
When correctly indicated and maintained, studies show survival rates comparable in the short and medium term. Very long-term follow-up is more limited than for two-piece implants, and longevity depends mainly on hygiene, check-ups and the load the implant receives.
If you have been offered a one-piece implant, or want to know whether your case is suitable, at Face Clinic we review your CBCT scan and explain which design fits best and why. Book a dental implant consultation.
