Analoyd design is protected by patent. It allows to use the concept of abutment duplication offered by the center of implantation planning Shendall Tec (Israel). This concept frees one from using costly technologies, is affordable for all dentists and dental technicians and also allows to significantly simplify clinical and laboratory stages of prosthetics on implants.
The essence of the design is in a new form, new principle of use and additional purposing of imitators of dental implants (which are known under a common name of ANALOG).
A traditional implant analog is intended for precise copying on the working model of positioning in the oral cavity (relative to the bone) of the elements of connective system of the implant and the prosthetic element (suprastructure).
The shape of most of analogs used today is determined by the necessity of a secure fixation of the analog in the body of the working model.
Analog «LA» designed by ANALOYD has a shape concept not used till now and, MOST IMPORTANTLY, completely unusual concept of application of analogs of dental implants.
One element of the concept of analog use is not new: It is the possibility of the easy extraction of the analog from the model without disrupting the integrity of the model and consequent possibility of as easily replacing the analog in its position.
However, totally new for removable analogs is the method of retaining high precision of the positioning of removable analogs within the body of the model as well as ensuring steady stability of removable analogs during the milling process of abutments (fixed on analogs) on the physical model in the milling machine, owing to special stabilizing elements.
First element – a retention ring made of resilient material, which is fixed in a circumferential groove on the body of the analog. During casting of gypsum model, the ring forms a recess/groove in a stone. Retention ring and the groove in the gypsum comprise the first element, which provides stable fixation of the analog when it is inserted into its bed in the body of physical model.
The second element that provides stability of the analog is a spherical locking joint: at the apex of the analog there is a specialspherical projection; this projection snaps into a corresponding nylon cap that has retention areas. With the help of these areas the cap is affixed within the body of the physical model.
Besides that, the analog has an outer round platform encased by a pentagon. Existence of the external pentagon coupled with the use of internal hexagon provides precise seating and steady stability of the future abutment duplicate on the analog.
Within the analog the regular inlet opening for the fixing screw is continued through the whole of its body length and ends with the outlet opening at the base of the spherical projection on the apex of the analog.
It is necessary in order to increase the quality of the process of obtaining duplicate, namely, to expel the air when duplicating material is injected in order to avoid formation of air pockets.
Possibility of easy extraction of the analog from the model and replacing it within the model on condition of maintaining high positioning precision of the analog in the body of the model significantly eases the process of abutment preparation for milling, for its subsequent grinding and polishing and also simplifies the stage of modelling on the abutment the basis of the future prosthetic structure, and later the work of frame coating.
But most importantly, the design specifics of analog LA and the capability of removal of analog connected to already prepared (milled and polished) abutment predetermine an easy, inexpensive and very precise way of manufacturing abutment duplicate fixed on analog LA (in accordance with the methods developed by Shendall Tec center).
This, in turn, allows final installation of abutments in the oral cavity (without the need of their subsequent removal) and the use their duplicates, not the abutments themselves, to continue the restoration.
In order to fully evaluate merits and usefulness of analog LA and the methodology, the application of which enables and presupposes the availability of analog LA, it is expedient to discuss in more detail the clinical and laboratory stages of making structures on implants in such clinical cases when there is a need for individual preparation and milling (and polishing) of abutments with the use of conventional (non-digital) technologies.
So, after making a working model for creating a structure on implants, and selecting abutments, the following stages are necessary:
1. Abutment preparation.
2. Abutment milling.
3. Abutment grinding (and polishing).
4. Modeling of the cap (as a base of the frame of the future structure).
5. Adjusting of shoulder margins (after obtaining of metal frame).
During abutment preparation stage there’s a need to extract abutments from the model and then replace them back into the model twice or thrice. To hold the abutment outside the model, some implant manufacturers offer to use an abutment holder that resembles implant analog with a comfortable handle.
Thus, every time, in order to extract the abutment from the model and attach it to the holder, it is necessary to perform the following manipulations: unscrew the fixing screw, detach the abutment, install it into the holder and fix it in the holder with a fixing screw. In order to replace the abutment into the model, all these operations must be performed again in reverse order.
Then abutment milling follows and after that, the polishing.
This, again, requires detaching of the abutment from the model and attaching it to the holder; after that, replacing it into the model in order to shape the frame of the structure. When the frame of the structure is ready, there’s a need to adjust the shoulder margins of each element of the frame. To accomplish this, there’s likewise a need to detach the abutment from the model with subsequent steps of its installation into the holder and then replacement back into the model.
It is clear that simple extraction of analog LA, to which the abutment is connected, from the model and placing it back into the model significantly simplify the work at the laboratory stages. Just as importantly, this eliminates an excessive adverse mechanical impact on the elements of the connective system of the abutment.
Now let’s see how analog LA allows to avoid harmful manipulations during clinical stages of prosthesis.
First let’s consider the sequence of laboratory and clinical stages commonly used today in clinical cases that require preparation of individual abutments.
In order to avoid serious errors in implant prosthesis today there’s a widely used concept (and it’s reasonable) of fitting on abutments in the oral cavity not the ready-made frame of the future prosthetic structure, but a frame made of hard plastic or composite material.
After a successful fitting of the base of the frame, it is sent to the laboratory, where the modeling of the frame structure is completed.
Hence, for the clinical fitting of the base of the frame the abutments must be set in the oral cavity, and after the fitting returned again to the model. In this case there is a need to remove healing caps or temporary abutments from the oral cavity, this disturbing already developed biological connection between the titanium and mucosa. This procedure has to be repeated also during the fitting of the completed prosthetic structure and later two or three more times till the prosthetic structure is finally ready.
Based on the above, the possibility of using the analog LA and the methods of duplication facilitates the work of the dentist and dental technician and, most importantly, helps to relieve the patient from repeated unpleasant procedure.
How is it done?
After making of individual abutments and modeling on them the basis of the frame of the future prosthetic structure (using ash-free acrylic mass or composite materials), the temporary bridge structure is also modeled on the abutments.
After that, the abutments are duplicated.