In those individuals when there is a variation of normal bone, it is better to place the implants and leave them integrate (bone to adhere to the implants). Clinical experience and over 30 yrs of research shows us this is a more predictable method for success.
The quality of bone is different in every site that implants are placed, whether it is in the upper jaw or lower jaw. This variation normally is more prominent in the upper jaw. It is one of those clinical situations we have learned to treat with less stress being loaded onto the bone during implant installation.
Quantity of Bone " there is not enough bone for implants"
There is a distinct difference between Quality of Bone and Quantity of Bone. The Quality was described in the above paragraph.
For years we told patients that they were not candidates for implants due to the amount of bone they had left from years of tooth loss and the shrinkage of the Bone that had taken place, this was the Quantity that we referred to.
Within the the last 10 years there has been significant new solutions that have addressed these clinical conditions. Those even with the slightest bone remaining are still a candidate for implants. If a patient can have a Tooth removed or undergo dental work, they are a candidate for implants.
How does variation in Normal Bone affect having teeth the same day.
When there is greater softer bone the inserted implants cannot gain adequate stability to screw teeth onto them. This first phase of implant stability is called Mechanical Stability it is the same as inserting a screw into wood. Different types of wood require more effort, especially those of harder nature, which you have to tap prior to placing a screw. The same is done with implants. This harder bone is found in the middle of the lower jaw and it varies for there to the softness of Balsa wood or Stryfoam in the upper jaw, softer towards the back of the jaw.
This initial mechanical stability is replaced by Biomechanical Stability within 2 - 4 weeks. This is the weakest time for implants and if they are stressed, we see the majority of complications at this time. From 4 - 6 weeks bone continues to grow and renders the implants more stable. Success rates for implants in the upper jaw are still well over 90%. In addition the most importantly they preserve the bone from further deteriorating, shrinking or melting away as seen with just wearing dentures alone. Whether teeth are fabricated the same day or not , the final work is not started till 6 months in the upper jaw and 3 months in the lower jaw. There is a waiting period to allow the body and the bone to adhere to the implants.
Today, successful implant integration is all done objectively, by computer analysis of each individual implant prior to fabricating the Teeth onto them.
The readings are used to determine if the patients implants are ready to accept the teeth. Depending on the readings, sometimes we choose to allow certain implants to heal longer and other we may expedite the fabrication of the Teeth. This objective computer analysis takes the guessing away from treatment.