Dental Implant Candidates: Are You Eligible?

Are You a Candidate for Dental Implants?

Most adults with one or more missing teeth are candidates for dental implants. The key eligibility factors are adequate jawbone density, healthy gums, good general health, and completed jaw development. Conditions that were once considered disqualifying — including moderate bone loss, controlled diabetes, and a history of smoking — can now be managed in the majority of cases through advances in bone grafting, treatment planning, and surgical technique.

The Australian Dental Association (ADA) reports that dental implants achieve a 95 to 98 per cent success rate when patients are properly assessed and treated according to evidence-based protocols. A comprehensive clinical and radiographic assessment is the only reliable way to determine your eligibility. At Townsville Dental Clinic in North Queensland, this assessment includes a 3D CBCT scan, full medical history review, and same-day treatment plan with transparent pricing — giving you a definitive answer about your candidacy in a single appointment.

Essential Eligibility Criteria

The following criteria determine whether you are a suitable candidate for dental implant placement.

Adequate Jawbone Density and Volume

The jawbone must have sufficient height, width, and density to support the titanium implant post. A minimum bone width of approximately 5 to 7mm and a height of 10mm is typically required for standard implants. If your bone is inadequate, bone grafting procedures can rebuild it to the required dimensions.

Bone loss is common after tooth extraction — the jawbone begins to resorb within months of losing a tooth and can lose up to 25 per cent of its width within the first year, according to research published in the Journal of Prosthetic Dentistry. The longer a tooth has been missing, the more bone loss is likely to have occurred.

Healthy Gums

Active gum disease (periodontitis) must be treated and stabilised before implant placement. Periodontitis causes progressive destruction of the gum tissue and bone that support teeth, and placing an implant into diseased tissue significantly increases the risk of peri-implantitis — infection around the implant that can lead to failure.

Treatment for gum disease may include professional deep cleaning (scaling and root planing), antibiotics, and improved oral hygiene practices. Once the disease is controlled, implant placement can proceed.

Good General Health

You must be healthy enough to undergo minor oral surgery and heal normally. Dental implant placement is performed under local anaesthesia and is comparable in invasiveness to a tooth extraction. Most systemic health conditions, when well managed, do not prevent implant treatment.

Completed Jaw Development

Dental implants are not placed in patients whose jaws are still growing. Jaw development is typically complete by age 18 in females and 18 to 21 in males. There is no upper age limit — healthy patients in their 80s and 90s regularly receive successful implants.

Eligibility Quick-Reference Table

Conditions That May Disqualify You

Certain conditions significantly increase the risk of implant failure or post-surgical complications.

Uncontrolled Diabetes

Uncontrolled diabetes (HbA1c above 9%) impairs wound healing and increases infection risk. A meta-analysis in the Journal of Dental Research (2014) found that poorly controlled diabetic patients had implant failure rates two to three times higher than healthy patients. Patients who achieve glycaemic control before treatment can proceed with success rates above 93%.

Heavy Smoking

Smoking constricts blood vessels and impairs osseointegration. Research in the Journal of the International Academy of Periodontology found failure rates of 6 to 11 per cent in smokers compared to 2 to 4 per cent in non-smokers. Patients smoking more than 10 cigarettes per day who are unwilling to quit face the highest risk.

Radiation Therapy to the Head or Neck

Radiation therapy to the jaw damages blood vessels in the bone, reducing its ability to integrate with an implant. Patients who received radiation within the past 12 months are generally not candidates. Those who completed radiation more than 12 months ago may be eligible after careful assessment.

Severe Osteoporosis

Severe osteoporosis combined with intravenous bisphosphonate medication increases the risk of osteonecrosis of the jaw. A case-by-case assessment with your medical team is essential.

Conditions That Can Be Managed

Many conditions that patients believe disqualify them can actually be addressed, allowing implant treatment to proceed.

Moderate Bone Loss

Bone grafting rebuilds jawbone lost due to tooth extraction, gum disease, or prolonged denture wear. Options include:

• Particulate bone graft — synthetic or donor bone material packed into the deficient area; new bone forms over 3 to 6 months.
• Sinus lift — the sinus membrane is lifted and bone graft material placed beneath it for upper jaw implants.
• All-on-4 technique — angled posterior implants engage existing bone, often eliminating the need for grafting entirely.

Bone grafting has a success rate above 90 per cent and is a routine procedure at Townsville Dental Clinic.

Controlled Diabetes

Patients with well-controlled diabetes (HbA1c below 8%) achieve implant success rates comparable to non-diabetic patients. Key management strategies include optimising blood sugar control in the weeks before and after surgery, coordinating with your GP or endocrinologist, and allowing a longer healing period (an additional 4 to 8 weeks) for osseointegration.

Smokers Who Commit to Quitting

Patients who quit smoking at least 2 to 4 weeks before implant surgery and remain smoke-free for at least 8 weeks after placement achieve outcomes that approach those of non-smokers. At Townsville Dental Clinic in North Queensland, we work with patients on a smoking cessation plan as part of the implant treatment pathway, and can refer to local Quitline services for additional support.

Mild to Moderate Gum Disease

Gum disease must be treated before implant placement, but it does not permanently disqualify you. Once periodontitis is stabilised through professional treatment and improved home care, the gums and bone can provide a suitable foundation for implants. Ongoing periodontal maintenance is essential to protect both your implants and remaining natural teeth.

The Assessment Process at Townsville Dental Clinic

The implant candidacy assessment follows a structured, evidence-based protocol.

Step 1: Clinical Examination

Your dentist examines your teeth, gums, bite, and oral tissues. The number, location, and condition of missing teeth are documented, and any existing dental conditions (decay, gum disease, failing restorations) are identified.

Step 2: 3D CBCT Scan

A cone beam computed tomography (CBCT) scan captures a three-dimensional image of your jaw. This reveals:

• Bone height, width, and density at each potential implant site
• The precise location of the inferior alveolar nerve (lower jaw) and maxillary sinus (upper jaw)
• Any pathology such as cysts, infections, or impacted teeth
• Whether bone grafting will be needed

The CBCT scan takes approximately 20 seconds and involves a fraction of the radiation of a standard medical CT scan.

Step 3: Medical History Review

Your medical history is reviewed to identify conditions or medications that may affect treatment, including diabetes, cardiovascular conditions, osteoporosis, bisphosphonates, blood thinners, immunosuppressants, and smoking history.

Step 4: Treatment Plan and Cost Estimate

Your dentist presents a written treatment plan that includes the recommended implant type, any preparatory procedures needed, a step-by-step timeline, and an itemised cost estimate with applicable health fund rebates. At Townsville Dental Clinic, health fund rebates are processed on the spot via HICAPS.

Key Takeaway

The majority of adults with missing teeth are eligible for dental implants. Conditions including moderate bone loss, controlled diabetes, smoking, and treated gum disease can be managed to allow successful implant treatment. The only reliable way to confirm your eligibility is a comprehensive clinical and radiographic assessment.

If you have been told in the past that you are not a candidate for implants, advances in bone grafting, All-on-4 techniques, and treatment planning may have changed your options. At Townsville Dental Clinic in North Queensland, we assess complex cases regularly and can provide a definitive answer about your eligibility.

Book an implant candidacy assessment

Sources: Australian Dental Association (ADA); Journal of Dental Research; Journal of the International Academy of Periodontology; Journal of Prosthetic Dentistry; Clinical Oral Implants Research.