A diagnosis of a chronic condition rarely rules out implant treatment. Far more often it changes the timetable: there is a consultation with the doctor managing your condition, follow-up tests and a preparatory stage that a healthy person would not need.
This article looks at the most common systemic conditions in the context of assessing suitability for the procedure: diabetes, Hashimoto's, high blood pressure, osteoporosis and blood clotting disorders. It also describes local contraindications that concern the mouth itself.
Contraindications to implants: absolute and relative
Contraindications to implants are divided into absolute and relative. This distinction matters more than it might seem, because it determines whether the conversation ends with a refusal or with a plan for preparation.
Absolute contraindications cover conditions where the risk is too high for the procedure to be considered at all. They include active cancer, severe immune system disorders and untreated severe blood disorders. Serious mental illnesses that may make cooperation during treatment impossible are also an absolute contraindication. Severe addictions belong in this group too.
Many contraindications to implants are, however, temporary. They disappear once the condition is under control, once sources of infection have been treated or once a therapy that temporarily lowers the body's immunity has ended. Dental implant placement remains a safe way to replace missing teeth, provided suitability has been assessed thoroughly.
How does diabetes affect healing and osseointegration?
Diabetes is a group of metabolic diseases in which the body does not produce enough of the hormone made by the pancreas, or the insulin it produces does not work properly. This hormone is responsible for glucose metabolism and supplies every cell in the body with the energy it needs to function.
Persistently high blood sugar causes pathological changes in the blood vessels. Damage to the blood vessels leads to poorer blood supply to the tissues. Further down the line, damage to internal organs means a risk of kidney failure, heart failure, stroke and, in extreme cases, limb amputation.
For implantology, one specific effect matters. When blood sugar is raised, wounds heal more slowly and the body is less able to fight bacteria. Diabetes therefore increases the risk of infection after implant placement.
When is diabetes a contraindication to implants?
The diagnosis alone does not settle anything. Diabetes is not an absolute contraindication to implants, but uncontrolled diabetes is a relative contraindication to implant placement and must be brought under control first.
The key is keeping blood sugar stable before implant placement, with a glycated haemoglobin result within the range agreed with your diabetologist. Controlling diabetes around the time of the procedure matters more than the type of diabetes itself.
Studies of patients with well-controlled diabetes show implant survival rates similar to those in healthy people. With poorly controlled diabetes the picture is different, and it is precisely this difference that determines suitability.
Diabetes and healing after implant placement
In poorly controlled diabetes, osseointegration takes almost twice as long as in healthy people. The implant takes longer to integrate with the bone, and the soft tissues also heal more slowly.
In practical terms, this means the prosthetic restoration is planned later and check-ups are scheduled more often. More attention is also paid to the area around the implant, because the risk of inflammation around it is higher.
When the condition is well managed, dental implants remain an effective solution for patients with diabetes too. In some cases the implant is then placed only after several months of monitoring. It simply takes longer and requires closer cooperation.
Hashimoto's, thyroid disease and dental implants
Hashimoto's disease is an autoimmune condition and is not an absolute contraindication to treatment. The condition is that your hormone levels are under control, confirmed by tests, and that you are under the ongoing care of an endocrinologist.
Untreated or poorly controlled hypothyroidism slows down tissue metabolism, which affects how quickly you heal. When thyroid hormone levels are normal, the risk associated with the procedure is not significantly different from usual.
The same applies to other autoimmune diseases. What matters is not the name of the diagnosis but how active the disease is and the treatment being used, especially therapy that suppresses the immune system.
High blood pressure, heart disease, anticoagulants and suitability for implant surgery
High blood pressure that is controlled with medication does not rule out implant surgery. The problem is uncontrolled high blood pressure, which increases the risk of bleeding during and after the operation.
Medication is a separate issue. Patients taking anticoagulant and antiplatelet drugs need the approach agreed with the doctor managing their treatment, because stopping a medication on your own can be more dangerous than the procedure itself. Blood clotting disorders may make implant placement impossible if they are severe and uncontrolled.
For patients with heart valve disease, after a heart attack or with a pacemaker, a cardiology consultation is necessary. Among other things, this establishes whether antibiotic cover is needed.
Osteoporosis, bisphosphonates and dental implants
Advanced osteoporosis increases the risk of dental implant failure, because it changes the quality of the bone in which the implant is to sit. Advanced, untreated osteoporosis is a contraindication to implant placement.
However, what matters is not only the condition itself but how the medication is taken. Bisphosphonates taken by mouth do not usually rule out the procedure. The intravenous form, used mainly in cancer treatment, is an absolute contraindication because of the risk of osteonecrosis of the jaw.
Here, eligibility depends on a careful history of the medicines you take, their doses and how long you have been taking them. It is worth bringing a list of your medications to the consultation, because patients often do not connect osteoporosis drugs with dental treatment.
Cancer and immune disorders
Active cancer of the head and neck is a contraindication to implant placement, as is ongoing chemotherapy or radiotherapy to that area. Cancer in its active phase is an absolute contraindication to implants.
Once cancer treatment has been completed, the situation changes. Surgery may be possible after an appropriate interval and with the approval of the treating physician. Irradiated bone heals more slowly and calls for more cautious planning.
Severe immune disorders, including the period after an organ transplant and immunosuppressive treatment, are assessed individually. Lowered immunity increases the risk of infection at the surgical site.
Local contraindications: what is happening in your mouth
Beyond general health conditions, the state of the mouth itself matters. Local contraindications are often easier to resolve, but if they are ignored they lead to failure just as surely.
- active infection in the area of the planned procedure,
- active inflammation in the mouth, which can lead to implant loss,
- untreated tooth decay and leaking fillings,
- insufficient bone, which prevents the implant from being placed securely,
- poor bone quality, which can make it difficult to seat the implant,
- poor condition of the neighbouring teeth and a bite that needs correcting first.
If there is not enough bone, the conversation does not end with a refusal. Bone regeneration or a sinus floor lift creates the conditions for placing an implant later, and the implant procedure itself is postponed by a few months.
Gum disease before implant placement
Periodontal disease weakens the support of the teeth and can cause them to fall out, and untreated periodontal disease increases the risk of complications after implant placement. The bacteria responsible for gum disease also colonise the tissues around an implant.
If gum disease is advanced, it requires surgical treatment before implant placement. Procedures such as a gum graft are sometimes necessary in periodontal disease to rebuild the band of tissue around the future restoration. We offer both non-surgical treatment, i.e. root planing, and FGG and CTG grafts.
Only once the disease has settled and the periodontium is stable do we return to the subject of implants. This order is non-negotiable, because an implant placed into active inflammation loses its chance of lasting.
The importance of oral hygiene before and during dental implant treatment
Poor oral hygiene is a contraindication to implant placement, and one of the few that depends entirely on the patient. Without a change in habits, the risk of inflammation around the implant rises from the first few months.
Improving your oral hygiene before the procedure is therefore part of the preparation, just like treating tooth decay. It includes professional teeth cleaning, instruction and a check that you can clean the spaces between your teeth properly.
Heavy smoking has a negative effect on healing after surgery, because it constricts the blood vessels and limits the oxygen supply to the wound. Smoking lowers the proportion of implants that heal successfully, and heavy smoking is often the main cause of failure in patients with no other health burdens.
Age, pregnancy and other temporary contraindications
Dental implants are not placed in people under 18, because the facial bones are still growing. Some specialists wait until the age of 21 if bone growth has not yet finished. People under 18 cannot have implants, however many teeth are missing.
There is, however, no upper age limit. There is no upper age limit for implant placement: what matters is your health, not the date on your ID.
Pregnancy is a temporary contraindication to implant placement, partly because of the need for X-ray diagnostics and for medication around the time of the procedure. The date is therefore set after the birth, and later still if you are breastfeeding.
How is eligibility for implant treatment assessed?
The final decision on eligibility for the procedure is made by the implantologist on the basis of the diagnosis, your medical history and imaging. An implant consultation costs 200 PLN in our price list and includes an assessment of local conditions and a discussion of possible solutions.
- a full medical history, including a list of the medicines you take,
- a CBCT scan taken with a NewTom Giano HR scanner,
- an assessment of your gums, hygiene and bite,
- if needed, a consultation with the doctor treating your chronic condition,
- digital planning of the implant position in CoDiagnostiX software.
There is a concrete reason for this individual approach. Two people with the same diagnosis may have completely different prognoses, depending on how well the condition is controlled, the medicines they take and the state of their mouth.
A single missing tooth usually means a simpler procedure, because the scope of surgery is smaller. With extensive tooth loss and a planned full-arch restoration, the demands on your general health increase and preparation takes longer.
What should you do before the consultation?
Before you make a decision, it is worth gathering your records: test results, a list of medicines and the contact details of your treating doctor. This shortens the path to a plan and helps avoid postponing the procedure at the last minute.
A chronic illness is a reason for caution, not for giving up. In most cases the problem is not the diagnosis itself, but whether the condition is well controlled and whether you can maintain good hygiene after the procedure. Ignoring any of these conditions leads to serious consequences, up to the risk of losing a neighbouring tooth or the implant itself.
