How to implant a short base implant
Research in the use of short base implants (less than 8.5 Mm) It is very active. If placed correctly, there is no major difference between standard and short length implant success rates. An exciting finding is the shorter abutment implants in the lower jaw compared to the upper jaw (upper jaw) They have a slightly higher success rate. In this article from Dr. Hossein Borjian's website The best cosmetic dentist in Isfahan We will examine the implantation of a short base implant.
crown-to-implant ratio when evaluating success in Short base implants It is important. Dentists carefully consider this issue when planning implant cases for patients. In traditional dentistry, a longer root often means greater strength and ability to support a dental bridge. If you apply a lateral load to the tooth, it will rotate just below the midpoint of the root. When starting to compare 1 To 1 You put the crown on the root, the situation becomes unfavorable. An implant is not like a tooth because it is integrated with the bone and does not rotate. Therefore, comparing the ratio of crown to root is different from the ratio of crown to implant.
Calculation of pressure in implants
When we look at pressure in implants, we consistently find that the highest pressure is at the tip of the bone spur. (The part closest to the gum line) And there is around the neck of the implant, and some pressure in the head as well (Bottom of the implant in the bone) Is. The conclusion is that short and long implants perform very similarly in terms of bearing forces.
But the height of the crown (and the abutment interface between the implant and the crown) It is important. To check this issue, we need to review a little physics:
Moment = force x distance
If you are a force 100 Have a Newton that is part of the implant crown that 2 cm away from the abutment holding it, applied, more than a torque 200 NCM is applied to the power implant. A longer tooth crown means a greater distance from the chewing force to the base of the implant. If the energy is not directed entirely vertically, this greater distance means greater torque force. If the control of torque forces is performed correctly, a high crown-to-root ratio leads to increased failure and failure of the implant or bone loss around the implant..
With this in mind, it is clear that as long as the masticatory forces are at the limit of the diameter of the implant, the pressures and stains felt by the implant will be the same regardless of crown length.. However, if the implant crown is wider, we will have a torque force because this force is outside the support range of the implant.. Therefore, a crown with a narrow implant base can have more stress and pressure around the implant neck. To ensure the success of dental implants, dentists design dental implant crowns with these basic physics in mind..
Wide implants
Sometimes dental implants are placed wider so that only short lengths are possible. However, some studies have shown that wide implants do not always correspond to increased stability. Dentists think that wide dental implants can be very useful, but they must have the right amount of bone surrounding them to support them.. In short, as long as we stay within the physiological limits of the bone, the dental implant will be able to bear the load..
Long crowns can have more mechanical effects than biological ones. For example, screws (Keeping the dental crown on the implant) They can loosen or break more often in long crowns, especially if the crown length is more than 15 be mm. To get around this issue, dentists often use an implant crown with a retaining screw, which is easy to use..
The main method of reducing forces in short base implants with long crowns is to ossify them together. Biomechanical studies show that ossified implants cause less pressure. Ossification of short base implants improves pressure distribution, reduces screw loosening, and improves cement retention.. One of the disadvantages of this method is that, in some cases, the ossification of the crown together makes it more difficult to maintain hygiene..
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Another way to improve the prosthesis result when using short-base implants is to use "implant abutment".. Implant abutments are connectors that connect the implant and the crown. If dental crown And if the implant is one piece, it increases the possibility of bad mating on the implant surface. This misalignment may cause "small fissures", bone inflammation and loss. Dentists always use the best possible prosthetic fittings. Also narrowing the width of crowns, preventing cantilever (Overhanging the dental prosthesis from the implant) and ensuring vertical loading (The reduction of the supporting force was mentioned above) It contributes to the success of the implant.
Overall, in areas of limited bone around molars and premolars, dentists do not always have to "bone graft" to longer conventional implant lengths..
Attention :
- The scientific accuracy of the above published material should be confirmed by the patient's personal consultation with Dr. Borjian.
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