Research in the Faculty of Mechanical Engineering at the Technion led to the revelation of the mechanical complications of the implants
Dental implants are an available and effective substitute for natural teeth. The ever-expanding use of implants leads to the constant development of new implants and implant parts, while changing the design and geometry. Israel is currently at the forefront of dental implant technology, with an impressive market share.
As the use of implants expands, mechanical complications, defects and problems are also discovered. One of the rare complications is a fracture in the implant or its parts as a result of prolonged use. In some cases, such a fracture requires removal of the implant and its replacement - a complex surgical procedure.
The dentist Dr. Keren Shemtov Yona has been researching mechanical complications in dental implants in recent years, and especially the failure mechanism known as "mechanical fatigue". As part of her master's thesis, which was conducted in collaboration between the Faculty of Mechanical Engineering at the Technion and the School of Specialization in Dentistry at the Rambam Medical Center, she dealt with the effect of implant design and the environment of the oral cavity on the strength of implants and the formation of mechanical fatigue failure.
At the end of the master's, Dr. Shemtov-Yona decided to deepen the study of implants as part of a PhD, which she began in 2013 under the guidance of Prof. Daniel Rittel from the Faculty of Mechanical Engineering. In one of the experiments carried out as part of the study, one hundred dental implants were collected from four dental clinics in Israel. All of these implants, which were removed from the patients' mouths following bone retraction, appeared completely intact. However, an examination of each of them with a scanning electron microscope revealed surprising findings: 62% of the apparently intact implants were found to have cracks and defects in various stages of development.
The publication of the study in the Journal of the Mechanical Behavior of Biomedical Materials recently caused a stir, and dental journals attacked the study and its results. The engineering community, on the other hand, regards the findings with great interest.
Are the research findings bad news for those who have had a transplant in the past? "It is still too early to give an unequivocal answer to this," says Dr. Shemtov-Yona, "Fractures in implants are rare complications, and each person has different relevant circumstances. However, there is no doubt that the forces exerted during chewing and closing the mouth may eventually lead to fatigue and fracture. Therefore, it is appropriate that the community of dentists and the community of implant manufacturers work to improve the quality of the implant and to develop ways to detect cracks and fractures early."
Dr. Shemtov-Yona is now focusing on the reasons for the development of cracks, with the aim of developing new solutions that will prolong the mechanical durability of the implant. According to Prof. Rittel, "The Technion is an ideal place for such research, where a bridge between engineering and the life sciences is required. Dental implants cannot exist without dentistry, but without engineering research they will not be able to be perfected and improved."
5 תגובות
Good Morning
Can a porcelain crown also be damaged in the race of the two?
Is it possible to do a root canal without a crown?
And what is the risk involved?
Thank you
BSD
Is your implant still intact?
Research at the Technion: Most dental implants crack over time
In light of the article published last week in the Gev section, Nava Katzin "Is your implant still intact?" I was happy to see the media in which Dr. Keren Shemtov Yuna presented a study performed on 100 patients with implants, 62% of which were cracked or damaged. Since I have had the above-mentioned bedding for many years. My name is Dr. Raphael Babkov and my field of practice is dental implants using the all on 4 tm method and zygomatic implants. I discovered the method in the last decade and it provides a solution and an anchor to avoid the breakage of implants or their failure. In the past I was an implanter using the conventional methods and I experienced implants more than once and twice broken or implants fail, so I decided to take action and look for a solution to the phenomenon. I arrived at one of the largest centers in the world for dental implants and discovered a completely different concept, not a structure implant and a bonded crown but an adapter implant (multi (unit) a titanium sleeve embedded inside the crown and a crown screwed onto the adapter. Such a system, both for a single implant and for multiple implants together, has many advantages and an integrated protection system of four important elements. Since the biggest enemy of implants is patients who grind their teeth or in the professional language bruxism
Patients who exert great pressures during sleep. The increasing load is dispersed and reaches the implant, sometimes it will cause breakage and sometimes it will cause failure of the implant.
The anchor provided by the system I mentioned is divided into four elements
1. The multi unit - if there are unreasonable pressures, the screw starts to loosen
2. The screw of the titanium sleeve - it is a very small screw that closes with n 15 (Newton) if there are unreasonable pressures the screw loosens.
3. The sleeve that is embedded is glued and not molded inside the crown, if there are unreasonable pressures, the glue is released
4. Composite crowns - in any situation where we have porcelain crowns in the opposite jaw, it is always recommended to restore with composite crowns (composite is a complex material quite similar in appearance to porcelain with a weaker abrasive force), so if there are unnecessary loads, we will see it by grinding the composite crowns . which constitute a shock absorber.
The idea was proofread by Professor Bernmark, the inventor of the world's first implant.
Senior restorers and veterans (their names are withheld in the system) report that this is the only implant graft they see that survives for so many years.
Therefore, the warranty I give for the implants is long-term, 20 years for failure of the implant and lifetime warranty for fracture or wear of the implant or one of the accompanying parts.
Additional benefits for the
1. There is no need to add bone
2. Permanent crowns within 24 hours
3. The aesthetic level of the crowns is higher than usual
4. The crown can be dismantled by the doctor elegantly (there is no need to dismantle the crowns violently)
5. There is no inflammation and bleeding around the crowns and implants.
Dr. Babkov Raphael
Okay, there is wear to the implant, implants can be improved, but isn't there also wear, and even more significant and irreparable wear, to the jawbones?
Is there no danger of a fracture in the jaw bone as a result of the mechanical loads that the implant exerts on the bone?
It seems to me that this is the main problem in the mechanics of implants, and for some reason it is not mentioned in the article.
If all dentists studied mechanics, the condition of the patients would be much better...
If it had passed the Israeli Standards Institute it would not have happened