What treatments can be applied in patients with insufficient jawbone?

What Treatments Can Be Applied to Patients with Insufficient Jawbone Density?

One of the fundamental anatomical challenges that doctors encounter during the rehabilitation of dental deficiencies through medical methods is the inadequate vertical (height) or horizontal (thickness) volume of the jawbone in the area where the procedure will be performed. Jawbone insufficiency is a clinical condition that limits the cellular level support for the artificial titanium materials to be added on top and the absorption of mechanical stresses that occur during chewing function. Current dental disciplines offer various medical alternatives in response to such deficiencies of biological tissues; these include bone augmentation (volume-enhancing grafts), sinus floor elevation procedures, autogenous block transfers, and custom-designed skeletal solutions. The common goal of these medical approaches is to prepare the ground for the restoration of the anatomical functions of the chewing system by reconstructing the biological infrastructure in the region.

In past years, fixed restoration options were considered medically impossible for individuals with bone volume below a certain millimeter threshold. However, with the advanced surgical techniques and biocompatible materials available today, these anatomical limitations can be overcome. Treatments planned for the areas where the jawbone has been resorbed (dissolved) are tailored specifically to the patient’s systemic physiology, the degree of bone loss, and radiological tomography analyses. In this comprehensive context, the cellular causes of jawbone deficiencies, the clinical functions of volume enhancement procedures, the characteristics of graft materials, and the medical details of advanced surgical concepts will be examined from an objective perspective.

What Anatomical Reasons Are Related to the Decrease in Bone Volume?

The decrease in bone volume can develop at the cellular level due to anatomical reasons such as loss of teeth leading to a cessation of physiological stimulation, bacterial damage caused by advanced periodontal diseases, cyst operations, or mechanical trauma to the jaw. When a tooth is extracted, the mechanical pressure that periodontal fibers around the root transmit to the jawbone ceases; this cessation of stimulation reduces the activity of bone-forming cells (osteoblasts) while increasing the activity of bone-resorbing cells (osteoclasts), leading to resorption of the ridge (the jawbone’s top) over time.

This process of degradation at the cellular level is defined as ‘resorption’ in medical literature. Particularly during the first six months following tooth loss, the alveolar bone shows a significant tendency toward horizontal narrowing rather than vertical. When the cortical (outer) layer of the jawbone thins, the area takes on the shape of a knife edge. In cases of periodontal diseases, the situation progresses through a different degradation mechanism. The infection caused by the descent of tartar and bacterial plaque from the gum pocket into the bone tissue leads to horizontal and vertical crater-like resorption of the bone.

Additionally, the long-term use of removable (clip-on) dentures is also a contributing external factor affecting bone volume. These dentures transmit chewing pressure not to the bone’s internal structure but directly to the gum surface and the underlying bone’s periosteum. Surface pressure creates a chronic effect that accelerates bone resorption by weakening physiological blood flow. Diagnosing anatomical reasons is the primary step in determining the medical treatment methods to be applied.

How is Alveolar Crest Augmentation (Bone Grafting) Planned?

Alveolar crest augmentation is planned according to the principle of reconstructing cellular volume by placing graft (bone powder) materials and barrier membranes after the missing bone volume has been measured in millimeters through three-dimensional radiological scans. The procedure aims to achieve biological standards for the insufficient thickness or height of the jaw ridge.

In the planning phase, the physician examines the shape of the bone defect. If the deficiency is in the horizontal direction (loss of width), techniques such as ridge expansion or onlay grafting are preferred. During the surgical stage, the gum tissue is incised with millimeter cuts, and the thin bone surface exposed to the open area is minimally debrided with special medical instruments to ensure increased bleeding (and thus enhanced healing cells) in the area. Subsequently, medically produced bone powders are placed in the missing area.

The soft tissue cells (gum cells) surrounding these added particles proliferate much faster than the bone cells. If the graft material is left exposed, the gum cells can seep into the graft, disrupting the osseointegration process. To prevent this cellular seepage, the area of augmentation is tightly covered with barrier membranes. The membrane creates a physical barrier between the gum and bone graft, allowing only the patient’s own bone cells to interact with the underlying graft. The process of the area biologically maturing and hardening generally includes a medical waiting period of 4 to 6 months.

What Characteristics Do Bone Grafts Used in Implantology Applications Have?

Implantology applications use bone grafts which can be classified based on their source as autogenous, allograft, xenograft, and alloplastic; these materials possess the ability to show biological compatibility with the body’s tissues (biocompatibility), serving as a scaffold for the patient’s own bone cells. These materials are completely sterilized calcium structures free of proteins.

In medical procedures, the function of the graft is not to behave like live bone directly. The added particles provide a supporting structure that promotes the formation of new blood vessels in that area of the body (angiogenesis). Osteoblast (bone-building) cells that come with the blood vessels encase these particles, and over time, they dissolve these particles and replace them with the patient’s original bone tissue. The clinical features and sources of the types of grafts used are detailed in the table below:

How Does the Sinus Lifting Procedure Work in Case of Maxillary Sinus Prolapse?

In the case of maxillary sinus prolapse, the sinus lifting (base elevation) procedure involves gently lifting the thin membrane that covers the air cavities located in the posterior regions of the upper jaw with special instruments and filling the resulting biological void with a bone graft. This medical procedure aims to increase vertical bone height in the area.

In human anatomy, the maxillary sinuses, located just above the roots of the upper canine teeth, are air cavities that assist in breathing and reduce the weight of the skull. When teeth in this area are lost, the sinus void tends to sag downward under the influence of air pressure. Concurrently, bone resorption due to toothlessness can lead to a reduction in bone height in that area to as little as 1-2 millimeters. This thin layer is not medically sufficient to support any titanium implant.

The physician performs the procedure using two different methods, either closed or open technique, following radiological measurements. In the closed technique, the sinus membrane is elevated from a small cavity where only a titanium screw will be placed, and the procedure is completed in the same session. In the open technique, a small surgical window is opened from the side of the jaw, facing the cheek, allowing direct access to the sinus membrane, which is then elevated extensively, and a substantial amount of graft particles is added to this area. After the open technique, a cellular maturation period of 4 to 6 months is planned depending on the case so that the graft hardens and turns into your own bone.

In Which Cases is Autogenous Bone Transfer (Block Graft) a Medical Necessity?

Autogenous bone transfer (block graft) is planned as a medical necessity in cases where the resorption of the jawbone has resulted in large defects that cannot be compensated with standard bone powders, especially when there is very minimal horizontal thickness or when the integrity of the bone is compromised due to traumas such as traffic accidents.

This procedure is considered an advanced surgical technique, regarded as the “gold standard.” While graft powders can easily take shape, they may struggle to maintain their structural integrity (mold form) in very large voids. When it is necessary to construct a solid wall that can carry its form within the jaw anatomy, a small, rectangular-shaped bone block is typically harvested surgically from the back of the lower jaw (ramus area) or from the tip of the jaw (symphysis area).

This live bone block is fixed to the deficient area using medical micro screws, resembling a wall panel. The small gaps around the block are supported with bone dust particles and covered with a membrane. The primary medical advantage of block grafts is that they contain living cells and growth factors, contributing to a much stronger biological integration process. However, because it requires the opening of a second surgical (donor) site in the patient’s mouth, it is only preferred in comprehensive approaches for severe bone loss.

How is Ridge Expansion (Splitting) Applied in Cases Where the Jawbone is Very Thin?

In cases where the vertical height of the jawbone is sufficient but the horizontal thickness is as thin as the edge of a knife, the ridge splitting technique is applied by dividing the peak of the bone longitudinally and stretching it sideways like the pages of a book. Titanium roots and graft materials are placed in the resulting gap.

This technique is mainly considered in the upper jaw anterior regions where bone elasticity is usually higher than in the lower jaw. The physician makes a linear incision along the upper boundary of the narrowed jawbone using ultrasonic surgical devices (piezosurgery) or very fine cutting instruments. The bone is slowly separated into two layers, creating a physiological gap in the middle. The flexibility of the jawbone allows this separation to occur without rupture within medical limits.

This expanded graft will be filled with materials prepared for Implantology. The gaps around the titanium pieces are filled with bone powder. The clinical advantage of the ridge augmentation procedure is that it creates volume directly in the inner area by separating the bone’s own walls instead of trying to thicken the bone from the outside. The primary stabilization (compression) of the artificial roots placed between the living bone walls is medically maintained at much higher levels.

Why is Guided Tissue Regeneration (GTR) and Membrane Use Preferred?

The technique of Guided Tissue Regeneration (GTR) and the use of membranes is preferred to physically limit the area occupied by rapidly proliferating soft tissue cells compared to slower proliferating hard bone cells. This approach serves as a cellular barrier management that guides the formation of new bone only in the desired area.

In human physiology, epithelial (gum) cells migrate and divide at a much higher rate compared to osteoblast (bone) cells. When a bone augmentation area is closed, epithelial cells immediately start to fill the void. If the epithelial tissue invades the bone graft, it will create a soft connective tissue called “fibrous” instead of hard bone tissue in that area. This soft tissue does not possess the medical capacity to support any titanium unit.

In the YDR procedure, the physician covers the bone graft material with a barrier membrane produced under medical standards. The membrane prevents the soft tissue from descending, allowing the bone-forming cells below to complete their calcification cycle in their isolated area. Most of the membranes used today are collagen-based, designed to be absorbed naturally by the body (resorbed) months after the procedure, thus eliminating the need for a second extraction surgery.

What Anatomical Advantages Do Zygomatic Systems Offer in Advanced Bone Loss?

In cases of advanced upper jaw bone loss, zygomatic systems provide the advantage of anchoring (support) to the very hard zygomatic bones (zygoma), which anatomically do not show signs of resorption, while bypassing the completely resorbed weak maxilla bone. This concept represents a medical alternative to long and challenging bone graft surgeries.

In patients whose upper jaw bone has completely eroded due to being edentulous for many years or due to various syndromes, elevating bone with standard procedures is a process that can take years, requiring multiple surgeries, and can lead to decreased cellular success rates. In zygomatic approaches, very long specialized titanium pieces ranging from 35 mm to 55 mm in length are used. The procedure is performed by accessing the zygomatic bone through the lateral wall of the upper jaw from inside the mouth.

The zygomatic bone (Os Zygomaticum) is one of the strongest columns in facial anatomy against biting forces and is not affected by resorption reactions due to tooth loss. Materials placed in this rigid area provide extraordinary mechanical support. The greatest clinical advantage of this method anatomically is that it allows for the attachment of stable temporary prostheses (early loading) to the patient on the same day of the operation, without waiting for months for graft healing in appropriate cases.

What Role Do Short Titanium Roots Play in Overcoming Anatomical Barriers?

Short or extra short titanium roots, designed for situations where the nerve canal is very close to the surface in the lower jaw or where the sinus floor drops significantly in the upper jaw, serve to provide safe placement over anatomical barriers to avoid advanced surgical procedures (bone grafting or nerve displacement).

In medical literature, materials shorter than 8 millimeters are generally classified in the “short” category (such as 4 mm, 5 mm, 6 mm). In the past, it was thought that short materials would not demonstrate sufficient resistance to chewing. However, thanks to microscopic advancements in surface roughening technologies and biomechanical innovations in the design of grooves, the surface area where bone cells come into contact with titanium has dramatically increased.

Thanks to these medical designs, for a patient with only 6 millimeters of height remaining to the nerve line of the jawbone, a short structure of 5 millimeters can be safely positioned without performing thick bone graft surgeries. Although the length of the part is short, its diameter is generally kept wide to enhance the surface area that will distribute the load onto the bone. Since there is no intervention to anatomical barriers, postoperative tissue edema is limited, and the cellular healing routine is more stable.

How Do Avrupadent Clinical Standards and Radiological Analysis Processes Work in Bone Insufficiency?

In cases where bone insufficiency is detected, Avrupadent clinical standards include not only two-dimensional films but also the three-dimensional scanning of the jaw with Cone Beam Computed Tomography (CBCT) and the analysis of this data in digital software. Doctors create a millimetric medical map by transferring the patient’s anatomical data to a virtual environment before the surgical procedure.

During the planning phase, the density value of the patient’s jawbone (Hounsfield unit) is measured through software. The areas of the bone that are the thinnest or where the nerve path passes are digitally marked. In Avrupadent procedures, the amount and type of graft to be applied in situations requiring bone addition, such as crest augmentation or sinus lifting, are determined individually based on three-dimensional analyses.

In the necessary medical tables, surgical guide plates are produced using 3D printers with virtual surgery data. Thanks to these guides, the physician accurately directs the instruments to the bone with the planned incision and depth on the computer during the operation. This high-tech product supports the preservation of biological structures in the operative field while ensuring that goals such as tissue healing and restoration of function are achieved within medical limits.