Diabetes mellitus

Overview

Board takeaway: Preserve usual food and medication intake for routine care; coordinate fasting and insulin changes before sedation or general anesthesia. Prepare to recognize and treat hypoglycemia.

• Chairside priority: hypoglycemia is the chairside emergency.
• Care planning: glycemic control predicts infection, healing and periodontal disease.
• Context: type 1 is the common pediatric form; type 2 is rising with obesity.

How does Diabetes mellitus affect dental management?

• Routine care: confirm usual meal and medication intake, recent hypoglycemia or ketoacidosis, current glucose when relevant, and the ability to eat after treatment. Keep fast-acting glucose available.
• Fasting or general anesthesia: schedule the first case, monitor glucose perioperatively, and coordinate basal or long-acting insulin adjustments with endocrinology and anesthesia.

Hypoglycemia

• First action: stop care and check glucose.
• If alert and able to swallow: give fast-acting glucose per the child’s diabetes plan, recheck in 15 minutes and repeat if still low.
• If unable to swallow or unconscious: give no oral intake, activate EMS, and use prescribed glucagon or IV dextrose by trained personnel.

Infection and antibiotics

• Source control: treat the source of odontogenic infection promptly.
• Therapeutic antibiotics: use therapeutic antibiotics for spread or systemic involvement, or an individualized compromised-host indication.
• Procedural prophylaxis: AAPD lists uncontrolled diabetes for physician consultation about procedural prophylaxis; it does not prescribe routine postoperative antibiotics solely for an elevated HbA1c.

Elective care

• Unstable control: if metabolic control is unstable, coordinate elective invasive or orthodontic care with the diabetes team.
• Same-day fitness: consider current glucose, recent severe hypoglycemia or ketoacidosis, periodontal health, and the ability to eat afterward; HbA1c alone does not establish same-day fitness.

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Stop care and check glucose promptly. An alert child able to swallow receives their planned fast glucose amount and a 15-minute recheck; an unconscious child receives no oral intake and needs EMS and rescue treatment.

Exam pearl

What is Diabetes mellitus?

A group of metabolic disorders characterized by persistent hyperglycemia from deficient insulin secretion, impaired insulin action, or both. Type 1 involves loss of insulin-producing pancreatic beta cells; type 2 involves insulin resistance and inadequate insulin secretion.

What are the main systemic features of Diabetes mellitus?

• Type 1: autoimmune beta-cell loss; polyuria, polydipsia, weight loss; DKA
• Type 2: insulin resistance with obesity and acanthosis nigricans
• Diagnostic thresholds include: laboratory HbA1c at least 6.5%, fasting plasma glucose at least 126 mg/dL, or random plasma glucose at least 200 mg/dL with classic symptoms.
• Confirmation and limits: in the absence of unequivocal symptomatic hyperglycemia, medical confirmation is needed; these are diagnostic criteria, not universal dental treatment cutoffs
• Treatment: Insulin by injections or pump with continuous glucose monitoring; metformin for type 2

What oral findings occur in Diabetes mellitus?

• Periodontal disease: Gingivitis and early periodontitis, worse with poor control
• Saliva and mucosa: Xerostomia, candidiasis, burning mouth, taste change
• Healing: Delayed healing and more postoperative infection when poorly controlled
• Development: Accelerated tooth eruption and salivary gland enlargement in some patients

For Diabetes mellitus, what do you do for sweating, shaking, and confusion?

• Hypoglycemia: stop care; check glucose if quickly possible
• Alert/able to swallow: give fast-acting glucose (juice, glucose gel or tablets) in the amount specified by the child’s diabetes plan. Recheck in 15 minutes and repeat if still low. The usual 15 g rule may be too much for young children; use their individualized amount. CDC hypoglycemia guidance.
• Unable to swallow/unconscious: nothing orally; activate EMS, give glucagon (IM or intranasal) or IV dextrose

A 12-year-old with type 1 diabetes on an insulin pump is scheduled at 11 a.m. What do you ask and how would you rather schedule?

• Ask about the latest HbA1c, recent hypoglycemia or DKA, current glucose (CGM reading) and whether they ate and dosed as usual.
• Schedule: Prefer a morning visit after the usual breakfast and insulin, keep it short, and have fast-acting glucose ready.

For Diabetes mellitus, how does diabetes affect periodontal health, and what is the link the other way?

• Diabetes → periodontium: Poor glycemic control increases periodontal inflammation, infection risk, and delayed healing.
• Periodontium → diabetes: Periodontal disease can make diabetes harder to manage; evidence on improvements in glycemia with periodontal treatment should not be treated as a guaranteed pediatric effect.
• Care plan: Treat periodontal disease and odontogenic infection promptly and coordinate glycemic care.

Sources

• Supplemental study guide: Pediatric Dental Study Guide: Diabetes
• NIDDK hypoglycemia guidance
• Systemic Diseases and Syndromes that Affect the Periodontium
• Management of Medical Emergencies
• Supplemental clinical source: NIDDK: Diabetes Tests and Diagnosis
• Supplemental clinical source: NIDDK: Diabetes, Gum Disease, and Other Dental Problems
• AAPD best practice: AAPD: Antibiotic Prophylaxis for Dental Patients at Risk for Infection (2026)
• AAPD best practice: AAPD: Management of Dental Patients with Special Health Care Needs (2026)