Overview

Tooth agenesis is the absence of one or more teeth congenitally, which may seriously affect oral health, functionality, and aesthetics. Dental implants have proven to be a highly effective solution, giving a natural-looking and durable replacement for missing teeth. By insertion within the jawbone, the implants provide stability, prevent bone loss, and restore both function and appearance.

The treatment includes preparing the implant for surgical placement, the healing of the osseointegration period before putting on a crown. Though considering age, the quality of bones, and systemic health are included, dental implants are considered the gold-standard treatment with regard to dealing with tooth agenesis while providing long-lasting oral rehabilitation.

Understanding tooth agenesis

Tooth agenesis is the absence of one or more teeth at birth. It is a common dental problem that has a negative effect on both the functioning and aesthetic properties of an oral cavity. A study recently published in MDPI indicates that the prevalence of tooth agenesis varies among different populations and that it is under the influence of genetic and environmental factors. 

Key mutations involved include those in genes such as MSX1, PAX9, and AXIN2. MSX1 is related to absent second premolars and third molars, whereas mutations in PAX9 primarily impact the development of molars. 

Clinical presentations can include changes in occlusion, spacing, and aesthetics, and may be treated orthodontically or prosthetically. Early diagnosis is crucial for appropriate planning of treatment and for potential systemic implications associated with genetic mutations.¹

Why choose dental implants?

Though many other alternatives are available for tooth agenesis, dental implants are preferred due to the following main reasons.

High success rate

Dental implants have been the most successful implant procedure for more than 10 years, with a success rate of over 97%.²

Bone preservation

Dental implants’ main advantage is to help preserve the jawbone. When a tooth is lost, the bone in that region starts to resorb gradually. Dental implants prevent this resorption by bonding with the bone, thus maintaining the structure of the jaw and the facial appearance. This is an important advantage over traditional dentures, which do not prevent bone loss.²

Preservation of adjacent teeth

Dental implants have the advantage over dental bridges in that they do not affect or alter neighbouring teeth. Unlike dental bridges, which have to alter adjacent teeth. Dental implants ensure healthy teeth are left intact, prosthetic, and functional.²

Enhanced functionality and aesthetics

Dental implants look and feel like natural teeth, which helps in their chewing and speaking ability. It is stable and supportive in its nature and will not cause irritation or discomfort associated with the removable denture. This also helps to restore the aesthetics of the smile, thereby bringing about a confident and functional outcome for the patient.²

When are dental implants suitable?

According to a publication in StatPearls by the National Centre for Biotechnology Information (NCBI), dental implants are indicated for:

Replacement of one or more missing teeth

Dental implants provide a long-lasting, stable, and durable substitution for single or multiple missing teeth.²

Edentulous patients 

Edentulous people are those who have lost all teeth due to gum disease or tooth decay. The advantage of implant-supported dentures lies in the case of edentulous patients since it provides these patients with higher retention and better comfort than ordinary dentures.²

However, there are some contraindications that exist for dental implant placement. A study published in the Journal of Clinical and Experimental Dentistry indicates that systemic conditions such as uncontrolled diabetes, recent myocardial infarction, or active cancer can cause risks during surgery and also affect healing.³

The implant procedure

Dental implant surgery is a procedure designed to replace missing teeth by inserting artificial roots into the jawbone. Treatment plans may vary based on specific clinical situations and patient needs. The process typically involves several key steps.

Initial consultation and assessment

A comprehensive assessment is ken by a consultant to evaluate the patient's oral health, bone density, and eligibility for implants. This may involve radiographic imaging and clinical examinations.

Surgical placement of the implant

The implant, typically constructed from titanium, is inserted into the jawbone. The different steps related to this procedure are:

Two-stage procedure

The implant is located under the soft tissue, and the gum is stitched over it. About 2-3 months are allowed to pass before healing takes place for the mandible; for the maxilla, 3-6 months are allowed before a second surgery is performed to uncover the implant and attach an abutment.²

One-stage procedure

The implant and a temporary abutment are placed simultaneously, and the implant is left exposed. This procedure does not require a second surgery.

Immediate loading

In some instances, an immediate temporary crown is placed over the implant immediately following surgery, under the condition of achieving initial stability.

Osseointegration phase

Following placement, there is a critical healing period, during which the implant will be integrated into the surrounding bone—a process called osseointegration. This guarantees the stability and long-term success of the implant.⁴

Abutment placement

After successful osseointegration, an abutment is attached to the implant. An abutment forms a part of the connector between the implant and the prosthetic tooth.

Prosthetic attachment

A prosthetic crown, bridge, or denture is prepared and bonded to the abutment; function and aesthetics of the patient's dentition are thereby restored.

During the process, adherence to the fundamental principles of surgery is needed for successful osseointegration and optimal placement that enables proper aesthetics and functional loading.⁵ Advances in implant technology and techniques continue to enhance outcomes and expand the indications for dental implants.

Special considerations

Here are the special points to consider when managing tooth agenesis with dental implants.

Patient age and bone development

• Placement of implants in young patients, especially under 18, should be done with great care since the bone structure is still developing. The implants will require adjustment or even replacement as the patient grows
• Early intervention is desirable, but should be monitored and prepared for adjustments⁶

Growth patterns in pediatric patients

• The craniofacial development is ongoing in the pediatric patient. Thus, any implants put there might disturb bone growth.
• The timing of implant placement is critical, and treatment planning should take into account not only the child's current growth phase but also future changes⁷

Implant survival rates

For patients suffering from congenital conditions such as ectodermal dysplasia and hypodontia, the implant survival rate has been reported between 88.5% and 97.6% based on the patient's condition and the implant placement technique used.⁷

Aesthetic and functional benefits

• Agenesis can improve both the aesthetic appearance and functional capacity of patients who have missing teeth
• In the maxillary region, aesthetic outcomes are especially significant for the lateral incisors or other visible teeth

Customised treatment plans

The patient's age, general health, and special dental needs should form the basis for decisions on placement. Personalized treatment is also necessary.

Potential for future adjustments

Implants may need periodic adjustments in growing patients. The implants should be followed up in the long term to ensure they remain functional and aesthetically pleasing as the patient matures.

By focusing on these key points, dental professionals can optimise outcomes for patients with tooth agenesis, particularly in younger or growing patients.

Benefits vs. alternatives

Dental implants are a widely recognised solution for managing tooth agenesis, offering several advantages over alternative treatments.

Benefits of dental implants

Durability and functionality

Dental implants are very durable and function as closely as is possible to natural teeth in appearance and feel. Patients can regain full chewing power, allowing them to eat an almost unlimited variety of foods comfortably.⁸

Bone preservation

Implants can stimulate bone growth and prevent bone loss, which are very essential for oral health and facial structure.⁸

Improved speech and comfort

Unlike dentures, the implants are securely inserted in the jawbone; therefore, there isno fear of slippage while speaking or consuming something. It enhances comfort and confidence.⁸

Long-term solution

Proper care causes dental implants to last for decades, making them a cost-effective and beneficial long-term solution for tooth replacement.⁸

Alternatives to dental implants

Dentures

The removable dentures are the least invasive non-surgical method. They replace the missing teeth, but the cost is low, and it may not provide comfort, stability, or function similar to an implant.⁹

Dental bridges

These are made of a false tooth inserted between adjacent natural teeth. They restore appearance and function but may alter healthy adjacent teeth and do not prevent bone loss in the jaw.⁹

Resin-bonded prostheses

These can be described as Maryland bridges, where the procedure is relatively less invasive. The procedure involves bonding a false tooth to adjacent teeth. These are suitable for replacing front teeth; however, they may not be as durable as other options.⁹

Partial dentures

 These are removable appliances to replace multiple missing teeth. Compared to implants, they are inexpensive but less comfortable and stable; they can impact speech and chewing.⁹

Considerations

Cost

Dental implants tend to be more expensive than other treatment options, such as dentures or bridges, though they may result in much more durability and more effective use.⁹

Procedure and recovery

Implant placement is done surgically and requires bone density to occur; healing times are typically longer compared to other nonsurgical methods.⁹

Oral hygiene

Regular good oral hygiene is necessary for the success of dental implants. Poor oral care may lead to complications.⁹

Summary

Dental implants are an excellent way of treating tooth agenesis with functionality and aesthetic qualities, as restoring the missing teeth benefits the patient. They provide longevity, preservation of bone structure, and increased comfort compared to alternatives such as dentures and bridges. The advantages of dental implants are particularly identified in growing patients; however, their implantation needs careful planning to account for developing bone. On the other hand, their increased price and surgical nature could make them less attractive for some patients. Dental implants are therefore the long-term and reliable option in managing tooth agenesis.