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Implant rehabilitation for patients with bone loss, jaw atrophy or conditions that make conventional treatment difficult.
A dental implant replaces the root of a lost tooth and requires sufficient bone volume and quality to integrate stably. When that support is absent, treatment is no longer a standard procedure and calls for specific surgical planning.
Complex implantology deals precisely with those situations: jaw atrophy, bone loss following extractions or infection, and the sequelae of trauma or previous surgery.
Assessment includes clinical examination, evaluation of the occlusion and soft tissues, and a CBCT scan that allows the available bone to be measured in three dimensions and relevant anatomical structures, such as the maxillary sinus or the inferior alveolar nerve, to be located.
Medical history, habits and any factors that may influence healing are also reviewed.
When the available bone is insufficient, different options exist depending on the type and extent of the defect: guided bone regeneration, bone grafts of various origins, or maxillary sinus floor elevation.
The choice depends on the specific defect, the area to be rehabilitated and the planned prosthetic outcome. In some cases reconstruction and implant placement can be carried out in the same surgical procedure; in others it is preferable to stage them.
Digital planning makes it possible to define the position of each implant according to the planned prosthesis and not solely to the remaining bone. Surgical guides can then be produced to transfer that planned position to the operating room.
After surgery, healing and osseointegration times are respected before the prosthetic phase. Subsequent maintenance, with appropriate hygiene and regular check-ups, is decisive for long-term stability.
Timeframes and outcomes depend on the type of reconstruction performed and on each patient's individual conditions.
A lack of bone does not automatically rule out implant-based rehabilitation, but it requires precise study of the available anatomy and the cause of the bone loss.
Knowing the height or width of the bone is not enough. Bone quality, soft tissues, nearby anatomical structures, the three-dimensional position required by the future prosthesis, and the loads it will need to bear must also be considered.
Depending on the defect, techniques such as bone regeneration, grafts, maxillary sinus lift or other reconstructive procedures may be considered. In severe atrophy, the problem may require a more complex approach.
The goal should not be to place an implant simply wherever bone still remains. Planning starts from the rehabilitation the patient needs and determines which anatomical conditions are required to achieve it predictably.
A graft may be considered when the volume or configuration of the existing bone does not allow an implant to be placed in a position adequate for future rehabilitation, or does not provide the conditions necessary for its stability.
The need depends on the defect. A narrow horizontal loss, a vertical deficiency, posterior resorption of the maxilla, or a localized defect around a missing tooth pose different problems and may require different techniques.
In some cases, bone reconstruction and implant placement can be performed simultaneously. In others, it is preferable to reconstruct first and allow healing before placing the implants.
For this reason, the relevant question is not only how much bone exists, but where it is located, what anatomy needs to be restored, and in what final position the dental rehabilitation needs to be placed.
Guided bone regeneration is a technique used to promote bone formation in certain defects. It is usually based on creating and protecting a space using a membrane, combined with graft materials depending on the characteristics of the case.
The membrane helps maintain favorable conditions for the regeneration process to occur, preventing early invasion of certain tissues into the area intended for reconstruction.
Different materials, membranes and surgical designs exist. The choice depends on the size and shape of the defect, the stability of the regenerated area, soft tissue closure, and the subsequent goal.
Not all bone defects can be predictably treated with the same technique. As the complexity or extent of the bone loss increases, other reconstructive procedures may become necessary.
The maxillary sinus is a cavity located in the upper jaw, close to the premolar and molar region. After losing posterior teeth, the bone available between the oral cavity and the sinus can decrease, both due to resorption of the ridge and due to the anatomical characteristics of this region.
Sinus lift is a technique intended to create conditions for increasing bone volume in certain posterior sectors of the maxilla. Different approaches exist, and the choice depends, among other factors, on the residual bone and the amount of augmentation needed.
In some cases the implants can be placed simultaneously; in others, reconstruction is performed first and implant placement follows later.
Its indication must be established after studying the anatomy through appropriate tests. Not every loss of posterior teeth requires a sinus lift, and alternative treatments may exist depending on the case.
Implantology can range from the relatively simple replacement of a single tooth to rehabilitations in patients with severe bone loss, anatomical alterations, trauma, or sequelae of previous surgeries. In these latter cases, the problem is no longer simply where to place an implant.
It may be necessary to reconstruct bone, modify soft tissues, assess anatomical structures, and establish a surgical sequence that eventually leads to a functional rehabilitation.
Three-dimensional planning can help relate the desired position of the future teeth to the existing bone and determine what reconstruction would be needed to achieve it.
This approach reverses the usual reasoning: instead of starting from the residual bone to decide where implants can fit, it starts from the prosthetic and functional result to be achieved and plans backward to determine the surgical needs.
3D virtual planning makes it possible to analyze anatomy, simulate procedures and accurately transfer the plan to the operating room, without replacing the surgeon's judgment.
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