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Difference between one peice and two peice Implant

 
  One piece Implant
 Two Piece Implant
Consideration
 

The implant and the abutment are fused – they are manufactured as one piece.

 
The implant and the abutment are separate. The abutment is either cemented or cold welded. If the abutment is secured with a screw onto the implant, then it can be considered to be three pieces.
  Basic Design
  Simple. No joint. Single peice.
  Complex. Two parts joint by screw.
 Implant placement procedure
Single sitting surgical procedure and very often flapless (no open surgical procedures are necessary). Implant procedures are less time consuming than that required for bridgework.

Very often more complex surgical procedures are necessary, spread over 2 or 3 sittings in a period of 3-6 months (Implant placement, Healing Screw placement & Abutment Placement)
  Loading
Immediate Loading  - ie patient can be given the crown(s) / bridge(s) the very next day.
Delayed Loading – very often a waiting period of minimum of 3 months is necessary efore loading the implants with prosthesis
  Prosthodontic procedure
 Conventional impressions of the implants can be made just as is the case with conventional bridgework. Less time consuming. 
 Conventional impressions of the implants can be made just as is the case with conventional bridgework. Less time consuming.
  Size and Design
A wide range of sizes and designs are available suiting various bone types and measurements. The designs even help avoid bone augmentation and sinus lifts.
Limited sizes and designs are available thereby limiting their application.
  Cost
These work out a lot more cost effective in comparison with two/three piece implants.
Expensive – with respect to the costs of the implants as well as the time taken for multiple procedures
   From the patient’s point of view
Less complex placement procedure, less number of sittings and crown(s) & bridges can be cemented in a day or two… more or less like that of a conventional bridgework & costs are comparable with that of conventional bridgework.
Crowns / bridges are cemented only after 3 months after the healing phase. Much more expensive than the conventional bridgework..
 Screw Loosening
 Absent.
Since there is no seperate abutment- screw-implant assembly.
 Very common. 
Being two piece, the relation between the root portion and the abutment portion can present problems. Studies have proved that two piece implants experience higher mechanical stress under oblique loading. 
  Long term Maintenance
Being a single piece, the strength provided by the implant is excellent and there is no separate root portion and abutment portion. Maintenance is very simple… maintenance is just the same as that of conventional bridgework.
Maintenance of these implants are more complex… very often screws (when used) are to be tightened at periodic intervals as there will be micro-movement between the implant and the abutment.

This VIdeo Demonstrate Two Piece Implant


One 
piece implants are the most convenient for the patient because of the following reasons:

»A single trip of 3 days is enough for the replacement of teeth, as they are designed for immediate loading.

»Affordable treatment because of the inexpensive dental implant.

»Lifetime warranty on these implants because of their dependable solid structure with no complications.

»No swelling or bleeding as these are flapless.

One piece implants  are more reliable and strong compared to the conventional screw based implants because they are single component solid implants. 

Two or Three Piece Implant:

Conventional implants (figures 2, 4) with screw joining the implant and abutment have many complications. The connecting screw is as thin as 2mm and its breakage is common. Loosening of the screw is common after several years and they have to be periodically tightened. 2 piece implants with angulation or in cantilevers are more prone to screw loosening and breakage. Because of the joint in between the implant and the abutment, there is leakage of food debris causing bone loss (figure 4). As such 2 piece implants are never given lifetime warranty. All companies are eliminating the use of screw and shifting to single piece implants or they are incorporating Morse cone in 2 piece implants.

Here are some of the advantages of using the single piece systems:

»A single piece implant being a single component structure has no joints or a connecting screw. This eliminates all the nagging complications of 2 piece implants. As such these implants do not have any problems that are associated with conventional screw based implants.
  • No screw as such no screw loosening or breakage.
  • No microleakage between implant components as these are single component and hence
  • No crestal bone loss, which is commonly seen in 2 piece implants
  • Very strong – a 3mm single piece implant is stronger than 4 mm conventional implant.

»These are designed specially for immediate loading. As such permanent crown or bridge is placed in 3 days.

»The procedures are mostly flapless, quick and simple. There is no need to cut the gum. Patients on aspirin or heparin need not stop the medicines.

»Cheap dental implants which make missing teeth replacement very affordable. The manufacturing cost of one piece implants is much less compared to 2 or 3 piece implants. As such the one piece implants are relatively cheap to more complex 2 or 3 piece implants. Dental implant treatment is more affordable as patients need not come back after 3 months. Their crown is fixed within 3 days as such all the work is completed in 3 days in a single trip.
All brands are now shifting to one piece implants.