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Dental bone atrophy is the progressive loss of the maxillary or mandibular bone that occurs as a consequence of missing teeth, periodontal disease, or certain systemic conditions, and which prevents or hinders the placement of dental implants without prior regeneration treatment.
The loss of a tooth immediately triggers a resorption process of the bone that supported it. Without the mechanical stimulation of the dental root, the body understands that the bone is no longer necessary and progressively resorbs it. In the first year after extraction, approximately 25% of bone volume is lost, and the process continues at a slower rate for years. The result is a jaw or mandible with reduced height and width that makes placing implants difficult or impossible without prior regeneration surgery.
At Asensio Dental Clinic, Dr. Lucía Asensio Romero (Registration No. 46002287) evaluates the degree of bone atrophy through a 3D scanner and plans the most appropriate regeneration treatment for each case. The first visit is completely free.
Types of dental bone atrophy
Dental bone atrophy is not uniform in all patients: its location, extent, and severity determine the type of regenerative treatment needed and the complexity of subsequent implant surgery. The classification most used clinically distinguishes between localized atrophy and generalized atrophy, although in practice many patients present mixed patterns with areas of different degrees of involvement in the same jaw.
Localized bone atrophy specifically affects the area where one or several teeth have been lost. It is the most common presentation and the most treatable: depending on the amount of bone lost, it can be resolved with guided bone regeneration techniques—membranes and filling materials—during the same surgical act as the implant placement or in a previous surgery. Generalized bone atrophy involves extensive bone loss affecting much of the maxilla or mandible, frequently associated with a long history of untreated tooth absences or uncontrolled advanced periodontal disease. In these cases, regenerative treatment is more complex and may require larger-scale bone grafts.
From a radiological point of view, atrophy is classified based on available bone height and width. A bone height of less than 10 mm or a width of less than 5 mm usually requires regenerative treatment prior to standard implant placement, although in some cases dental implants without bone or zygomatic implants allow for patient rehabilitation without the need for bone regeneration.
Causes of bone atrophy
The main and most frequent cause of dental bone atrophy is unreplaced missing teeth. The mechanical stimulation exerted by the dental root on the bone through chewing is the biological stimulus that maintains bone density and volume. When the root disappears, that stimulus also disappears and the bone is resorbed. That is why placing an implant as soon as possible after extraction is the most effective measure to prevent atrophy: the implant transmits to the bone the stimulation previously transmitted by the root.
Untreated periodontal disease produces active destruction of the alveolar bone that supports the teeth. Unlike atrophy due to tooth absence, in this case, the bone is lost while the teeth are still present, which makes extraction and subsequent rehabilitation even more complex. Trauma that destroys the maxillary or mandibular bone—fractures, cystic or tumor lesions, osteonecrosis—can also generate bone deficits requiring reconstruction.
Among the systemic conditions that accelerate bone loss are osteoporosis, uncontrolled diabetes, treatment with bisphosphonates—which can produce osteonecrosis of the jaws—and smoking, which reduces bone blood flow and hinders regeneration. For patients with systemic conditions that complicate treatment, consult our special needs patient care page.
Treatments for dental bone atrophy
The goal of bone atrophy treatment is to recover lost bone volume to the point where it is possible to place implants with correct dimensions and three-dimensional position. Available options are selected based on the required bone volume, the location of the defect, and the patient’s general conditions.
| Treatment | Indication | Description |
|---|---|---|
| Guided bone regeneration | Mild to moderate localized defects | Collagen membrane and filling material to guide bone growth |
| Block bone graft | Higher volume defects | Autologous bone from the chin, ramus, or extraoral sites for reconstruction |
| Maxillary sinus lift | Posterior maxilla atrophy | Augmentation of the maxillary sinus floor to create space for the implant |
| Zygomatic implants | Severe upper maxilla atrophy | Long implants anchored in the zygomatic bone, without the need for grafting |
Frequently asked questions about dental bone atrophy
Can an implant be placed if I have bone atrophy?
In most cases, yes, although prior bone regeneration treatment may be necessary. Evaluation through a 3D scanner allows for accurate determination of the amount of available bone and planning of the most suitable treatment. In cases of severe atrophy, zygomatic implants or short implants are alternatives that avoid the need for grafting.
How long does it take for atrophy to occur after extraction?
The resorption process begins immediately after extraction. In the first year, approximately 25% of bone volume is lost, with higher speed in the first three months. Therefore, it is recommended to plan implant rehabilitation as soon as possible after extraction, ideally in the same surgical act when conditions allow.
Does bone atrophy have symptoms?
Bone atrophy itself does not produce pain or noticeable symptoms until it reaches an advanced stage. Signs that the patient may notice include a change in the fit of removable prostheses—which stop fitting correctly—alteration of facial contour due to sagging soft tissues, and in advanced cases, difficulty chewing. Diagnosis is made through panoramic X-rays and 3D scanners.