Who Should Not Get Dental Implants?
People who should not get dental implants include those with uncontrolled diabetes, active cancer treatment, recent jaw radiation therapy, severe immunosuppression, heavy smoking unwilling to quit, active severe gum disease, and those under 18-20 years old with incomplete jaw growth. Understanding these contraindications helps protect patient safety and prevents unsuccessful outcomes.
Absolute Contraindications (Cannot Have Implants)
Active Cancer Treatment
Why implants are contraindicated:
- Chemotherapy severely impairs healing
- Radiation therapy damages bone and tissue permanently
- Immune system compromisedâcannot fight infection
- Risk of implant failure very high
Timeline: Usually wait 1-2 years after cancer treatment completion with oncologist clearance essential
Recent Radiation Therapy to Jaw
High-dose radiation (>50 Gy) permanently damages bone vascularity and healing capacity:
- High risk of osteoradionecrosis (jaw bone death)
- Drilling can trigger bone breakdown
- May be permanent contraindication
- Requires specialist evaluation
Severe Uncontrolled Diabetes (HbA1c >9%)
Why very high risk:
- Severely impaired healing and high infection risk
- Poor osseointegrationâfailure rates 2-3x higher
- HbA1c >9%: Generally considered too high to proceed safely
- HbA1c <7%: Good control, acceptable candidate
Path to becoming suitable: Work with GP/endocrinologist to improve control to HbA1c below 7-7.5%, demonstrate stable control for 3-6 months, then reassess
Active Severe Gum Disease (Untreated Periodontitis)
Bacteria from gum disease will infect implant, causing peri-implantitis and very high failure rate
Resolution required:
- Treat gum disease first (deep cleaning, possible surgery)
- Demonstrate stable, healthy gums for 3-6 months
- Establish excellent oral hygiene
- Then proceed with implants
Once controlled, treated gum disease is not a contraindication
Strong Relative Contraindications (Very High Risk)
Heavy Smoking (More Than 10 Cigarettes Daily)
The evidence:
- Non-smokers: 95-98% success
- Light smokers (<10/day): 90-93% success
- Heavy smokers (>10/day): 80-85% success
- Very heavy smokers (>20/day): 70-80% success
Many dentists refuse treatment for heavy smokersârisk of failure too high
IV Bisphosphonates (for Cancer/Severe Osteoporosis)
High-dose IV bisphosphonates create 1-15% risk of jaw bone death (osteonecrosis). Oral bisphosphonates much lower risk (<0.1%) and usually acceptable.
Incomplete Jaw Growth (Under 18-20)
Age guidelines:
- Females: Usually 18+ years
- Males: Usually 20+ years
- Implant placed in growing jaw becomes "stuck" as surrounding teeth shift
- Creates aesthetic and functional problems very difficult to correct
Temporary Contraindications (Wait Until Resolved)
Common Temporary Situations
Pregnancy
Wait until after delivery and ideally after breastfeeding to avoid x-rays and medications
Acute Infection
Treat infection completely, wait until fully recovered (usually 2-4 weeks)
Recent Heart Attack or Stroke
Usually wait 6 months after cardiac event with cardiologist clearance
Unstable Medical Conditions
Stabilize condition first, then reassess for implant candidacy
đĄ Key Takeaways
- Absolute contraindications include active cancer treatment, recent jaw radiation, severe uncontrolled diabetes (HbA1c >9%), and active severe gum disease
- Heavy smoking (>10 cigarettes daily) significantly reduces success rates from 95%+ to 80% or lower
- Age under 18-20 is contraindication due to incomplete jaw growthâjawbone must be fully developed
- IV bisphosphonates for cancer or severe osteoporosis create high risk of jaw bone death (osteonecrosis)
- Most medical conditions are relative contraindications requiring management rather than absolute barriers
- Well-controlled diabetes (HbA1c <7%), treated gum disease, and controlled high blood pressure do not rule out implants
- Pregnancy is temporary contraindicationâwait until after delivery and ideally after breastfeeding
- Active alcohol or drug addiction prevents compliance with care and severely impairs healing
- Severe immunosuppression from organ transplants or advanced HIV usually permanently contraindicates implants
- Insufficient bone can often be corrected with graftingâanatomical limitations are rarely absolute contraindications
- If one dentist says no, consider second opinionâsome practitioners more conservative than others