Dental Management of Patients with Chronic Kidney Disease

Chronic kidney disease affects an estimated 850 million people worldwide, and the number of patients surviving on dialysis or with a renal transplant continues to rise. These patients carry an oral disease burden that is substantially higher than that of the general population, and their medical ...

Chronic kidney disease affects an estimated 850 million people worldwide, and the number of patients surviving on dialysis or with a renal transplant continues to rise. These patients carry an oral disease burden that is substantially higher than that of the general population, and their medical status changes the way almost every routine dental procedure must be planned. This article reviews the oral manifestations of renal disease and sets out a practical protocol for safe dental treatment.

The Burden of Chronic Kidney Disease

The Global Burden of Disease study published in The Lancet in 2020 estimated that chronic kidney disease affected approximately 850 million individuals globally, with a prevalence of between 9 and 13 per cent of the adult population. The condition is frequently undiagnosed until renal function has already declined substantially.

Staging and Clinical Significance

The Kidney Disease Outcomes Quality Initiative classifies the condition into five stages according to glomerular filtration rate. Stage 5, defined as a filtration rate below 15 millilitres per minute, corresponds to established renal failure and usually requires dialysis or transplantation.

The stage determines the risk profile. Patients at stage 3 may require only medication adjustments, whereas those at stage 5 require coordinated care with the renal team before any surgical procedure.

Oral Manifestations

A cross-sectional study in Oral Diseases in 2017 reported that more than 70 per cent of patients receiving haemodialysis complained of xerostomia, and that caries and periodontal disease were significantly more prevalent than in matched controls. Reduced salivary flow removes both the buffering capacity of saliva and its mechanical clearance of plaque.

Other recognised findings include uraemic stomatitis, halitosis with an ammoniac odour, altered taste perception, enamel hypoplasia and pale mucosa reflecting anaemia. Drug-induced gingival overgrowth is a particular concern, and a study in the Journal of Clinical Periodontology in 2011 found that up to 30 per cent of patients taking calcium channel blockers and 50 per cent of those taking cyclosporine developed clinically significant enlargement.

Medical Assessment Before Treatment

No dental treatment should begin before the renal status, the current medication list and the most recent laboratory results have been reviewed.

Laboratory Values

Patients with renal failure have prolonged bleeding times because of uraemic platelet dysfunction, even when the platelet count is normal. A report in the Journal of the American Dental Association in 2009 recommended checking the international normalised ratio and the platelet count and consulting the nephrologist when the ratio exceeds 3.

Anaemia is almost universal and may reduce tolerance for procedures performed in the upright position. Haemoglobin, electrolytes and blood pressure should therefore be reviewed alongside the coagulation profile.

Medication Review

Several drugs commonly prescribed in dentistry are excreted by the kidney and accumulate in renal failure. Acyclovir and gabapentin require dose reduction, metformin should be avoided, and non-steroidal anti-inflammatory drugs are contraindicated because they further reduce renal perfusion.

Calcium channel blockers and cyclosporine are frequent causes of gingival overgrowth, and substitution or dose adjustment should be discussed with the prescribing physician rather than managed by periodontal surgery alone.

Management During Dental Treatment

Infection Control

Patients receiving dialysis have a higher prevalence of hepatitis B and hepatitis C carriage than the general population, and standard precautions should be applied to every patient regardless of known status. Immunisation against hepatitis B should be confirmed before elective treatment.

Local Anaesthesia and Prescribing

Lidocaine and articaine are metabolised in the liver and are acceptable in renal failure. Prilocaine should be used with caution because its metabolite can induce methaemoglobinaemia when the dose is excessive.

Vasoconstrictors are generally safe in controlled hypertension, which is common in this group. Blood pressure should be recorded at every visit because of the combined effects of renal disease and antihypertensive therapy.

Bleeding Risk and Vascular Access

The arteriovenous fistula used for dialysis is the patient's lifeline, and the arm carrying it must never be used for blood pressure measurement, venepuncture or intravenous injection. A study in the American Journal of Kidney Diseases in 2012 confirmed that fistula complications are a leading cause of hospitalisation in this population.

Dialysis itself is performed with heparin, and elective procedures are therefore best scheduled on a non-dialysis day or the day after dialysis. Local haemostatic measures, including sutures, pressure and topical agents, should be prepared before extraction.

Dental Care for Dialysis Patients

Timing of Appointments

Short morning appointments are preferable, since fatigue and post-dialysis hypotension increase as the day progresses. Treatment on the day of dialysis should be avoided because of the residual anticoagulation effect.

Restorative and Prosthetic Considerations

Xerostomia substantially increases caries risk, and topical fluoride, dietary advice and frequent recall intervals are the mainstays of prevention. A study in the Journal of Prosthodontics in 2015 reported implant survival above 90 per cent in patients with well-controlled renal disease, although bone quality and healing may be compromised.

Prevention and Oral Hygiene

Preventive care is more important in this group than in any other, and daily plaque removal should be thorough but gentle because of the bleeding tendency. A soft powered brush such as the BrushO allows patients with limited manual dexterity or gingival tenderness to remove plaque effectively without traumatising the gingiva.

Chlorhexidine may be used for short periods when oral hygiene is compromised, and patients should be advised to reduce the potassium and phosphate load of their diet without abandoning dental health measures.

Conclusion

Chronic kidney disease alters the risk profile of routine dental care, from bleeding control and drug prescribing to the timing of appointments around dialysis. Patients benefit most when the dental and renal teams communicate, and when preventive care is delivered early and consistently. With these precautions, dental treatment can be provided safely and predictably in even the most advanced stages of renal disease.