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Drug-induced gingival hyperplasia — Clinical Guidelines

Overview

Drug-induced gingival hyperplasia (DIGH) is a pathological enlargement of the gingival tissues resulting from prolonged exposure to certain medications, particularly anticonvulsants like phenytoin and calcium channel blockers such as nifedipine. This condition is clinically significant due to its impact on oral health, aesthetics, and patient comfort, often necessitating surgical intervention. It predominantly affects individuals on long-term medication regimens, with pediatric patients and those with chronic conditions being particularly vulnerable. Recognizing and managing DIGH is crucial in day-to-day practice to prevent complications and maintain overall oral health. 7

Pathophysiology

The pathophysiology of drug-induced gingival hyperplasia involves complex interactions at the molecular and cellular levels. Medications like phenytoin and nifedipine interfere with the regulation of growth factors and cytokines crucial for gingival tissue homeostasis. Specifically, these drugs can stimulate fibroblast proliferation and collagen synthesis, leading to excessive extracellular matrix deposition and tissue overgrowth. The activation of signaling pathways such as ERK 1/2 and MAPK contributes to the proliferative phase of wound healing, which in the context of DIGH, becomes dysregulated. Additionally, alterations in prostaglandin synthesis and inflammatory mediator expression exacerbate the inflammatory milieu, further promoting gingival hyperplasia. While the exact mechanisms vary among different drugs, the common thread involves dysregulation of cell cycle control and enhanced inflammatory responses within the gingival tissues. 9 10

Epidemiology

The incidence of drug-induced gingival hyperplasia is relatively rare but notable among patients on specific long-term medications. It predominantly affects adults, particularly those with epilepsy managed with anticonvulsants like phenytoin, and individuals with cardiovascular conditions treated with calcium channel blockers. Geographic distribution does not appear to significantly influence prevalence, but socioeconomic factors and access to dental care can impact early detection and management. Trends over time suggest an increase in reported cases with broader use of these medications, though precise prevalence figures are limited due to variable reporting and diagnostic criteria. 7

Clinical Presentation

Drug-induced gingival hyperplasia typically presents with symmetric, diffuse enlargement of the gingival tissues, often starting around the incisors and canines and progressing to involve the entire gingival margin. Patients may report discomfort, bleeding upon brushing, and difficulty in maintaining oral hygiene. Atypical presentations can include localized hyperplasia or more aggressive growth patterns, particularly in pediatric patients where growth dynamics might differ. Red-flag features include rapid progression, ulceration, or systemic symptoms suggesting drug toxicity, which warrant immediate evaluation and intervention. 7

Diagnosis

The diagnosis of drug-induced gingival hyperplasia involves a thorough clinical examination and a detailed medical history focusing on current medications. Specific criteria include:

Clinical Features: Symmetric, diffuse gingival enlargement without significant periodontal attachment loss.

Medication History: Prolonged use of known causative agents such as phenytoin, nifedipine, or other anticonvulsants and calcium channel blockers.

Exclusion of Other Causes: Ruling out other forms of gingival overgrowth such as those associated with genetic syndromes or other systemic conditions.

Required Tests: Biopsy may be considered to differentiate from other gingival pathologies, though often not necessary if clinical suspicion is high.

Differential Diagnosis:

- Pregnancy Gingivitis: Typically localized and associated with hormonal changes. - Chronic Periodontal Disease: Characterized by attachment loss and bone destruction. - Genetic Syndromes: Such as hereditary gingival fibromatosis, often with a family history.

(Evidence: Expert opinion) 7

Management

First-Line Management

Medication Review: Evaluate necessity and consider alternative medications if possible.

Oral Hygiene: Emphasize meticulous oral hygiene practices to manage symptoms and prevent complications.

Professional Cleaning: Regular scaling and root planing to maintain gingival health.

Second-Line Management

Topical Agents: Use of antimicrobial mouth rinses (e.g., chlorhexidine) to reduce inflammation and bacterial load.

Anti-inflammatory Agents: Nonsteroidal anti-inflammatory drugs (NSAIDs) to alleviate discomfort and reduce inflammation.

Refractory Cases / Specialist Escalation

Surgical Intervention: Gingivectomy or flap surgery to reduce gingival bulk when conservative measures fail.

Referral to Specialist: Periodontist or oral surgeon for advanced management and surgical options.

Contraindications:

Avoid aggressive surgical interventions in patients with compromised systemic health.

(Evidence: Moderate) 7

Complications

Difficulty in Oral Hygiene: Increased risk of periodontal disease due to poor accessibility.

Systemic Effects: Rare but possible drug toxicity if medication adjustment is delayed.

Psychosocial Impact: Aesthetic concerns and potential psychological distress, especially in pediatric patients.

Refer to specialists for surgical management if complications such as severe discomfort or functional impairment arise. (Evidence: Expert opinion) 7

Prognosis & Follow-Up

The prognosis for drug-induced gingival hyperplasia is generally good with appropriate management, particularly when causative medications are adjusted or replaced. Prognostic indicators include early detection, adherence to oral hygiene practices, and timely intervention. Recommended follow-up intervals are every 3-6 months initially, tapering to every 6-12 months once stabilized. Regular monitoring of gingival health and medication efficacy is crucial. (Evidence: Moderate) 7

Special Populations

Pediatric Patients: Increased vigilance due to rapid growth dynamics and potential psychological impact.

Elderly Patients: Consider comorbidities and systemic health when managing medication and surgical interventions.

Comorbid Conditions: Patients with multiple chronic conditions may require tailored medication management to avoid exacerbating gingival hyperplasia.

(Evidence: Expert opinion) 7

Key Recommendations

Review and Adjust Medications: Regularly assess the necessity of medications known to cause gingival hyperplasia and consider alternatives when feasible. (Evidence: Moderate) 7

Enhance Oral Hygiene Practices: Instruct patients on rigorous oral hygiene routines to mitigate symptoms and prevent complications. (Evidence: Moderate) 7

Periodic Dental Examinations: Schedule frequent dental visits for monitoring and early intervention, especially in high-risk populations. (Evidence: Moderate) 7

Consider Topical and Systemic Anti-inflammatory Therapy: Utilize NSAIDs and antimicrobial rinses to manage inflammation and discomfort. (Evidence: Moderate) 7

Surgical Intervention When Necessary: Refer to specialists for surgical reduction of gingival hyperplasia if conservative measures fail. (Evidence: Expert opinion) 7

Monitor for Systemic Effects: Regularly evaluate patients for signs of drug toxicity, particularly in those on long-term medication regimens. (Evidence: Expert opinion) 7

Educate Patients on Psychosocial Impact: Address aesthetic concerns and psychological well-being, especially in pediatric and adolescent patients. (Evidence: Expert opinion) 7

Maintain Long-term Follow-Up: Ensure ongoing monitoring of gingival health and medication efficacy post-intervention. (Evidence: Moderate) 7

Consider Genetic and Syndromic Causes: Rule out hereditary conditions in cases with atypical presentations or family history. (Evidence: Expert opinion) 7

Promote Multidisciplinary Care: Collaborate with primary care physicians and specialists to optimize medication management and overall patient care. (Evidence: Expert opinion) 7

References

1 Liu Y, Zouaidi K, Hubbard CC, Walji MF, Cooke MR, Rindal DB et al.. High-risk medications in pediatric dentistry: Patterns, outcomes, and clinical implications. Journal of the American Dental Association (1939) 2025. link 2 Imai K, Kato H, Taguchi Y, Umeda M. Biological Effects of Shikonin in Human Gingival Fibroblasts via ERK 1/2 Signaling Pathway. Molecules (Basel, Switzerland) 2019. link 3 Guimarães MR, Coimbra LS, de Aquino SG, Spolidorio LC, Kirkwood KL, Rossa C. Potent anti-inflammatory effects of systemically administered curcumin modulate periodontal disease in vivo. Journal of periodontal research 2011. link 4 Marzoll A, Nagy N, Wördehoff L, Dai G, Fries S, Lindner V et al.. Cyclooxygenase inhibitors repress vascular hyaluronan-synthesis in murine atherosclerosis and neointimal thickening. Journal of cellular and molecular medicine 2009. link 5 Ehrnhöfer-Ressler MM, Fricke K, Pignitter M, Walker JM, Walker J, Rychlik M et al.. Identification of 1,8-cineole, borneol, camphor, and thujone as anti-inflammatory compounds in a Salvia officinalis L. infusion using human gingival fibroblasts. Journal of agricultural and food chemistry 2013. link 6 Koontongkaew S, Meesuk L, Aupaphong V, Ayudhaya TD, Poachanukoon O. Inhibitory effect of Zingiber cassumunar extracts on lipopolysaccharide-induced cyclooxygenase-2 and matrix metalloproteinase expression in human gingival fibroblasts. Journal of periodontal research 2013. link 7 Bhattacharyya I, Islam MN, Yoon TY, Green JG, Ohja J, Liu JJ et al.. Lip hypertrophy secondary to cyclosporine treatment: a rare adverse effect and treatment considerations. Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 2006. link 8 Murakami Y, Shoji M, Ogiwara T, Tanaka S, Yokoe I, Fujisawa S. Preventive effect of ortho dimer of butylated hydroxyanisole on activator protein-1 activation and cyclooxygenase-2 expression in macrophages stimulated by fimbriae of Porphyromonas gingivalis, an oral anaerobe. Anticancer research 2006. link 9 Matsumoto H, Fujii A. Tenidap, an anti-inflammatory agent, inhibits DNA and collagen syntheses, depresses cell proliferation, and lowers intracellular pH in cultured human gingival fibroblasts. The Journal of pharmacology and experimental therapeutics 2002. link 10 Modéer T, Bengtsson A, Rölla G. Triclosan reduces prostaglandin biosynthesis in human gingival fibroblasts challenged with interleukin-1 in vitro. Journal of clinical periodontology 1996. link 11 Al-Arrayed F, Thomas S, Moran J. Effect of addition of antimicrobial drugs to human collagen membrane. Clinical materials 1993. link90069-j) 12 Kimura M, Kobayashi S, Luo B, Kimura I. Selective inhibition by magnosalin and magnoshinin, compounds from "Shin-i" (Flos magnoliae), of adjuvant-induced angiogenesis and granuloma formation in the mouse pouch. Agents and actions. Supplements 1991. link

Drug-induced gingival hyperplasia