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Massimiliano Apolloni
Abstract         Curriculum          Bibliografia  
 
Dental implantodontics is that branch of dentistry that someone who has lost some or all of his/her teeth is referred to for the sake of having them back again by means of artificial tooth root insertions replacing those missing, and which teeth are then fixed upon.  
The method has many years of study behind it. In fact, the search for a means to substitute lost teeth goes right back to the remote past, with the use of various systems and materials. The difficulty of the task may be better understood by considering it is only with our own times that we have finally arrived at the fine-tuning of the techniques that, in most cases, resolve the problem.  
The Aztecs, Egyptians, Chinese, Etruscans, up to the more “modern” times of the Moors in Spain, just to mention some of the peoples involved in such research over the centuries, all attempted to dabble in dental implantodontics.  
Archeological excavating and tomb discoveries have unearthed skulls and jawbones in which, in the place of some missing teeth, there were insertions of elements imitating the shape, more or less well-modeled, of human teeth. The materials used for these teeth were sometimes extracted from shells, other times from rocks or even, as in one case reported in Nature magazine (January “98), the inserted root in the empty alveolus was found to be made of tempered and pounded iron. 
The doubt naturally arose among researchers that, given the veneration of the dead that was abound in ancient times, such dental implants would have been post-mortem additions. However, it would seem from various discovered cases that they had in fact been inserted in life and had functioned for a certain period.  
Setting aside the historical aspects, it can now be affirmed that the last 70/80 years or more have seen a frenzy of serious study in this dentistry discipline.  
Though it may be compared to other medical and surgical specialties seeking cures for life-threatening infirmities, this dental research in implantodontics is, nevertheless, of utmost usefulness. For our good fortune, there have been professionals who have applied themselves with almost religious fervor to tracking down the system for re-implanting teeth in way that they would be just as stable as natural ones. 
Even if the references are brief, we are duty-bound to recall some of the steps along the journey in dental implantodontics in recent times.  
It is particularly because we Italians are often ardent admirers of everything foreign that I want to point out that it was an Italian who started off this line of research which, in recent decades, has led to the recognition of this method.  
This was Dr. Formiggini from Modena who, in the latter 1940s, devised a “spiral-shaped” metallic implant to be inserted into the alveoli of extracted teeth. He reckoned that fibrous or bone tissue would be generated in and around the various twists, which would then allow the fixing of teeth onto the part of this very particular root emerging from the gum line. 
In reality, well before Dr. Formiggini, other researchers like the American Strock or the Swede Dahl (in the early 1900s) had sought, respectively, either to insert deeply into the bone tissue or to support above, some special metallic roots, upon which artificial teeth would then be fixed.  
There were deep-set implants and “juxta-osseous” if instead they were just laid against the bone tissue when this was insufficient to allow deep insertions. However, probably because of the times (unsuitable equipment, lack of appropriate materials), the hoped-for outcomes did not occur.  
With the advent of a more recent age (around the 1950s and 60s), the first successes began to be achieved. Thanks are due to those forerunners (Cherchev, Muratori, Tramonte, Pasqualini, Linkow, Scialon, the above-mentioned Formiggini and several others), many of whom are now departed, who pushed the research forward; because of them, implantodontics began to take hold in Italy too, apart from America, France and Argentina, and to become widespread with the achievement of satisfactory outcomes.  
Unfortunately, none of these researchers ever agreed among themselves to make their discoveries official and credible.  
It may be said in their defense that they were often (indeed almost always) harshly opposed by the universities and the scientific Establishment, perhaps because it was not considered seriously that some private individuals could bring such a great discovery to a conclusion, which at the time had something miraculous about it.  
And this hostility that these forerunners faced has still not fully dispersed: there is still an absurd diatribe between those that practice both traditional and modern methods, and those who only avail of the latter.  
As already recalled, implantodontics was much contested in the past and even when it had to be accepted - given that it had become an uncontestable reality - the accusations continued to fly that serious research had never been carried out on the discipline. According to badly founded opinion, implantodontics should be accepted because a Swedish discoverer (who, apart from anything else, is not even a dentist) has made known that which the researchers of old had long sought in vain to make known.  
And that is to say, that artificial roots (made of inert metals, of course, so as not to cause reactions), if placed in bone tissue and kept fixed and stable right from the first moment of their insertion, would be perfectly included within it.  
Then, the expression “osteo-integration” was immediately coined, rather than the “osteo-inclusion” of the old researchers! Currently, we are asked to believe that it is only with the latest generation of implants (i.e. those created by the Swedish inventor and similar) that the so-called “osteo-integration” can be obtained.  
But this is not true! Most implantations, if well executed, “osteo-include” themselves, since the principles of the procedures, both modern and traditional, remain the same. In a more correct light, in fact, the various existing implants and techniques (whether traditional or modern) are complementary to each other. Indeed, given the anatomic variants of the mandible and maxilla, knowing more methods and using several kinds of implant makes it possible to resolve almost all the cases that present themselves in professional practice in a more complete and satisfactory way.  

As a corollary to what I have set out in synthesis, it has to be unfortunately said that all traditional implantodontics - by means of which some 99% of edentulous (without teeth) cases can be resolved with excellent results - if continually repressed and opposed, will die away in the near future. In its place will be the latest method to emerge, the one wrongly called “osteo-integration alone”, which is good and, moreover, very simple to carry out, when there is an abundance of bone tissue in which to insert the quite bulky cylindrical implants proposed with this system.  
However, it calls for a maxillofacial surgical operation involving rather traumatizing and invasive interventions, enlarging the insertion site by means of tissue grafts from other parts of the skeleton, such as the pelvis (iliac crest), cranial theca, ribs and (when possible) the chin.  
Apart from the long period of time needed with this method before the patient can actually have the definitive teeth, not everyone would be disposed to undergo such interventions, especially if advanced in years.  
It is therefore to be predicted that a good 60-70% of those that can now avail of implantodontics using traditional procedures, at whatever age, will soon have to renounce this option if things continue in this way.  
Indeed, ostracism of the traditional techniques has now reached the point where all the specialist magazines and scientific journals in dentistry categorically refuse to publish prosthesis-implant studies, even if perfect from every point of view, if they have been conducted with traditional procedures.  
The professors who know and apply only the latest discovered method, the so-called “osteo-integrated” one, only teach this to their students in the universities, and just as at one time they opposed dental implantodontics in general, they now deny the validity of any method other than the one proposed and practiced by themselves.  
It is truly a pity, but also a great injustice (with serious social consequences), that after many efforts and studies in order to offer a fine set of fixed and functional teeth to almost everyone that needs them, because of absurd and false position-taking, both for the wish to simplify everything to the maximum but also for marketing reasons,  there is a now incontrovertible desire to destroy a patrimony of dental experience and culture!     
 

 
 
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Fig. 1 

X-ray of the jawbone, showing how, with one of the many “classical” implantodontic systems, some thin implants like needles can be inserted when the bone tissue is very scarse both in depth and density. Such needles form the artificial roots and are positioned as tripods, joined together in the part emerging from the bone and gum and, with the excessive part cut off, function as stumps upon which the teeth are then fixed. 
 
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Fig. 2   X-ray of the cylindrical “modern implants” inserted in the bone: being fairly bulky, they need abundant bone issue both depth and density-wise.
 
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Fig. 3 

X-ray showing the holes of a certain size that are needed in the mandible or maxillary for the placement of the cylindrical implants. Clearly, using this method alone there has to be a consistency of bone tissue available. In practice this is not always the case.
 
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Fig. 4 

X-ray showing the holes of a certain size that are needed in the mandible or maxillary for the placement of the cylindrical implants. Clearly, using this method alone there has to be a consistency of bone tissue available. In practice this is not always the case.
 

 

 

 
 

Fig. 4 Osteointgration or, better osteoinclusion
The photo shows a"used"histological preparation belonging to prof. Karl Donat of the University of Hamburg. lt is the much-enlarged section of a needle imbedded in bone and perfectly osteointegrated.Dr. Pierangelo Manenti of Bergamo extracted the needle together with the tissue surrounding it for study reasons. ln fact it was partofan implantodontics operation carried out with needles that had been in position for several years and removed by the saure colleague who had placed them and who then sent it to the aforesaid university.
Here, several sections were made(fifteen)along all of the section of needle and the histological preparations set lt is clear from the photo how all around the section of the implant (which apart from anything else is completely smooth surfaced with no knurling nor
artifacts so that the surrounding bone would better adhere to it), the bone tissue is strongly laid against it and compacted. There are scores or even hundreds of implant types that could be mentioned, of the most disparate kinds, as defined by remaining fixed in the bone tissue for a given time span. In fact it is not the shape of the implant or the operating technique that favors osteointegration but rather its immobfility with in the bone. Once positioned,this immobility of the implants can be achieved by embed ding them in the bone and leaving them to implant for a few months, or uniting them together when it is a question of implants having immediately emerging stumps, or keeping them back with braces anchored to nearby teeth, or, wheh possible, lnserting the implants very deeply. So, it ls not only with the "modem" implantodontics (f.e. those having conical or cylindrical forms)that the much sought?after "osteointegration"can be achieved, but with almost any implant type, Pro vided that the operatorisable to somehow achieve their fixation and immobility right from the very moment of placing them in the bone tissue.