Bone grafting for dental implant insertion
What are bone grafts for dental implants?
Various situations and pathologies can cause bone loss in the jaws. The most common cause is natural resorption following tooth loss. Additionally, infections—whether caused by decayed teeth, periodontal disease, or old dental implants with issues—can result in bone defects that may hinder or prevent the placement of dental implants.
Bone grafting for dental implant placement is performed when the patient’s maxillofacial bone structure is insufficient to support the implants intended to replace missing teeth. Its primary objective is to rebuild the lost bone to enable the successful placement of dental implants.
There are numerous bone regeneration techniques; however, in general, bone grafting involves using the patient’s own bone (harvested from other parts of the mouth or body) or specialized biomaterials. These are placed in the areas requiring regeneration through a surgical procedure performed by a dentist specializing in oral surgery and implantology.
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Types of bone graft materials
Autografts
This involves the patient’s own bone, harvested from a donor site with abundant bone and transplanted to the area with a deficiency. It can be obtained in particulate or block form, from a site near the area to be grafted, from other regions within the mouth, or even from other parts of the body. It possesses high osteoconductive, osteoinductive, and osteogenic capabilities, along with excellent biocompatibility. Currently, it is the only graft material with a superior capacity to activate cells and regenerative processes. The only disadvantage is that, in some cases, it may partially resorb over time; therefore, the dental specialist must have a deep understanding of the underlying biology. Although a donor site is required, proper planning often allows for bone to be harvested from an area adjacent to the regeneration site, thereby limiting patient discomfort.
Allografts
These come from another human donor and are commonly known as freeze-dried bone. While they offer the advantage of being available in unlimited quantities without requiring additional surgery to harvest donor bone, they are infrequently used in dentistry and implantology due to the potential risks of cross-infection between humans. Furthermore, they also tend to resorb over time.
Xenografts
Graft material derived from animal species such as pigs, cows, or horses. Their main advantage is that they can be used in unlimited quantities without donor site surgery. Through various treatments, manufacturers produce a completely safe material for human use, offering different resorption patterns and formats (particles, pastes, blocks, etc.), which facilitates their application across all types of indications.
Alloplastic or synthetic grafts
The latest materials to be developed are entirely created from basic components in a laboratory. This means that using various salts of calcium, phosphate, magnesium, and more, it is possible to manufacture regeneration materials in all formats with ‘on-demand’ qualities. While these materials are already a reality, their current performance is comparable (neither better nor worse) to xenografts. Undoubtedly, their characteristics will improve in the future until they become the gold standard for bone regeneration.
Bone grafting techniques in implantology
Below, we describe some of the bone grafting techniques we most commonly use at our specialized dental implant clinic:
Alveolar Ridge Preservation
This technique is used following a tooth extraction, particularly in the aesthetic zone (anterior maxilla), to reduce natural bone resorption that occurs after tooth loss. By minimizing bone loss, the subsequent implant placement is more straightforward and yields more predictable aesthetic results.
Sinus Lift
This technique is used in the posterior region (molars and premolars) of the upper arch when the bone height below the maxillary sinus—a hollow cavity everyone has in their skull—is insufficient for implant placement. Essentially, it consists of placing bone graft material between the floor of the maxillary sinus and the mucous membrane that lines it. Over time, beneath this membrane, the grafted bone converts into the patient’s own bone. There are several modalities depending on the available bone height: we utilize indirect sinus lifts with simultaneous implant placement in cases with 5-8 mm of bone; direct maxillary sinus lifts with simultaneous placement when 4-5 mm are available; and direct sinus lifts with delayed implant placement when there are 3 mm or less.
Guided Bone Regeneration (GBR)
This is based on the use of occlusive membranes to separate the bone from soft tissues, allowing defects to fill with bone. Research shows that without these membranes, since gum tissue grows faster than bone, the defects would not fill with the desired bone tissue. Biomaterials are placed beneath the membranes to prevent them from collapsing. The choice of membrane and biomaterial depends on the specific type of defect we are addressing.
Block Bone Grafts
This involves harvesting bone blocks from the patient, generally from intraoral sites such as the mandibular ramus or the mental symphysis, and then screwing them into the defect area to be regenerated. Recently, techniques such as those described by Professor Khoury have been introduced; these use thin bone plates as a barrier (similar to guided bone regeneration membranes) to protect particulate bone (autologous or biomaterial) inside. This offers the advantage of requiring smaller blocks, causing less patient discomfort, and allowing the particulate bone to regenerate better and faster than large blocks.
Horizontal Bone Regeneration
Occasionally, the alveolar bone ridge where we intend to place dental implants has sufficient height but insufficient width to accommodate them. For implants to function correctly and remain problem-free over time, they must be completely surrounded by bone. In cases of moderate atrophy, it is possible to place the implant and simultaneously regenerate any dehiscences or fenestrations (exposed parts of the implant) using autologous bone or biomaterials. When facing more severe horizontal atrophy, a bone regeneration specialist has several options: guided bone regeneration, block grafts, or ridge expansion techniques, among others.
Vertical Bone Regeneration
In cases of more severe atrophy, whether due to infections or long-term tooth loss, bone height is insufficient. Vertical atrophies are the most complex defects to resolve and represent the greatest challenge for a dentist. In these instances, it is essential for the patient to seek a specialist with extensive experience in implantology and regeneration. Several relatively recent techniques exist to address these situations; some utilize guided bone regeneration (using non-resorbable, titanium-reinforced membranes to gain height without collapsing), while others involve block grafts.
Recovery and Postoperative Care
These types of surgeries require local anesthesia in all cases, and more complex procedures should also be performed under conscious sedation. Consequently, complex cases cannot always be treated safely in many traditional dental clinics, as they require facilities and equipment specific to clinics specializing in advanced implantology and complex oral surgery, such as our IDIM dental clinic in Valencia.
Monitored Recovery Process
The recovery process is closely monitored by our specialists, and it is vital for the patient to follow all instructions for a successful outcome. Our oral implantology specialist will prescribe antibiotics and pain relievers to prevent infection and manage post-operative discomfort. Significant bone grafts may lead to notable inflammatory reactions; while usually not painful, they can cause swelling and bruising, which typically subside within one to two weeks.
Oral Hygiene
Patient oral hygiene is a critical factor in avoiding graft infections, which could jeopardize the entire procedure. If a graft becomes infected, the chances of achieving bone gain are minimal. By following our guidelines and attending follow-up appointments in the weeks and months following the bone graft, the patient ensures proper healing.
Sufficient Recovery Time
The patient must allow sufficient time for recovery, which enables the dentist to examine the results and determine if the graft has effectively stimulated the regeneration of the damaged bone and met the final objective of the procedure.
Temporary Dietary Restrictions
The intake of hard and hot foods should be avoided until the inflammation in the area has subsided. Additionally, patients should refrain from activities such as spitting, brushing the wound area, applying pressure, or rinsing the mouth vigorously.
In many bone grafting techniques, the patient cannot wear a prosthesis that rests on the surgical site during this period, as the stability of the graft is fundamental for successful regeneration.
Timelines for achieving bone regeneration
Following the intervention, a waiting period of several months is necessary for the body to incorporate the grafted material and create new, sufficiently strong bone. This waiting time can range between 2 and 9 months, depending on the type of defect and the regeneration technique used. Patience is key; respecting biological timelines is essential, as attempting to rush the process risks compromising the results. A team of specialists in advanced implantology and bone regeneration will provide clear guidance on the ideal recovery timeframe.
In cases where only a minor graft is required, it is highly likely that the surgeon can perform both the grafting and the dental implant placement in a single surgery.
In these cases, the specialist must ensure there is enough of the patient’s own bone available to secure the implants; the graft is then performed around the site to increase the volume of bone supporting the implant.
This decision will depend on the patient’s medical history and a comprehensive evaluation of the bone atrophy and available bone through radiographic testing—specifically Cone Beam Computed Tomography (CBCT). In some instances, the final decision can only be made at the time of surgery.
At our dental clinic in Valencia, we specialize in the most complex cases. We have dedicated over 30 years to dental implants in Valencia and serve as a referral center for other professionals in our field.
If your case is complex, book an appointment with us; we will be delighted to assist you.
Book an appointment for dental implants with bone grafting in Valencia
At the IDIM Institute of Implantology, led by the Peñarrocha doctors, we don’t just care for your smile—we provide effective solutions, backed by our extensive experience and dedication.
With over 30 years of specialization in dental implantology, we apply advanced techniques and cutting-edge technology to ensure the best results for our patients.
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