Recurrent Aphthous Stomatitis STEPHEN R. PORTER, MD, PhD ANNE HEGARTY, BDS, MSc FOTINI KALIAKATSOU, BDS, MSc TIM A. HODGSON, FDS RCS MRCP (UK) CRISPIAN SCULLY, CBE, MD, PhD R ecurrent aphthous stomatitis (RAS) is a common disorder affecting 5% to 66% of examined adult patient groups. There may be a female predominance in some adult and child patient groups.1– 4 The ulceration usually commences in the second decade,5 although 40% of selected groups of children can have a history of RAS, ulceration beginning before 5 years of age, the frequency of affected patients rising with age. Children of higher socioeconomic status may be more commonly affected that those from low socioeconomic groups.6 –9 Clinical Features The clinical features of RAS comprise recurrent bouts of one or several rounded, shallow, painful oral ulcers at intervals of a few months to a few days; RAS has three main presentations: minor (MiRAS), major (MaRAS), or herpetiform (HU) ulcers (Table 1). Minor recurrent aphthous stomatitis (MiRAS), the most common variety, affects about 80% of RAS adult and child patients, and is characterized by round or oval shallow ulcers usually less than 5 mm in diameter with a gray-white pseudomembrane enveloped by a thin erythematous halo. Usually, MiRAS occurs on the nonkeratinized mobile surfaces such as the labial and buccal mucosa and floor of the mouth and is uncommon on the gingiva, palate, or dorsum of the tongue. These lesions heal within 1 to 2 weeks without scarring.5 Major recurrent aphthous stomatitis (MaRAS) is an uncommon and severe form of RAS, comprising oval or irregular ulcers that may exceed 1 cm in diameter. These ulcers have a predilection for the lips, soft palate, and fauces (but can affect any site), persist for up to 6 weeks, and often heal with scarring. Herpetiform (HU) is very uncommon, being characterized by multiple recurrent crops of small, painful ulcers that may be distributed throughout the oral cavFrom the Eastman Dental Institute for Oral Health Care Sciences, University College London, London, England. Address correspondence to Stephen R. Porter, M.D., Department of Oral Medicine, University College London, University of London, 256 Gray’s Inn Road, London WC1X 8LD UK. © 2000 by Elsevier Science Inc. All rights reserved. 655 Avenue of the Americas, New York, NY 10010 ity. As many as 100 ulcers may be present at a given time, although they tend to fuse, producing large irregular ulcers. It has been suggested that HU might have a female predisposition and also a later age of onset than other RAS types or represent a spectrum of oral disorders manifesting as recurring ulcers.10 Disorders Giving Rise to RAS-Like Disease Similar-appearing lesions may arise in systemic disorders including Behcet’s disease,11–15 Sweet’s syndrome,16 –18 cyclic neutropenia,19 –21 benign familial neutropenia,22,23 MAGIC syndrome,24,25 a periodic syndrome with fever and pharyngitis,26 various nutritional deficiencies with or without underlying gastrointestinal disorders,27–29 some other primary immunodeficiencies,30 –33 and infection with human immunodeficiency virus.34,35 Rarely, drugs such as nonsteroidal anti-inflammatory drugs (NSAIDS)36 or nicorandil37 can give rise to oral ulcers, similar to RAS. Systemic Diseases Possibly Associated With RAS The precise etiology of RAS is not known. A number of disease associations have been proposed and are suggested to be of etiological significance; however, these links are often tenuous and/or unlikely to be significant to the development of the ulceration of RAS. Hematinic Deficiency Several studies from the UK, United States, and Spain have demonstrated that hematinic deficiency (iron, folic acid, or vitamin B12) are twice as common in RAS patients than in controls.38 – 46 About 20% of patients with RAS may have a hematinic deficiency, though one U.S. study did not report any hematinic problem.47 Vitamin B1, B2, and/or B6 deficiency was observed in a cohort of Scottish patients with RAS.48 Gluten-Sensitive Enteropathy Less than 5% of outpatients who initially present with RAS49 –51 are prone to have gluten-sensitive enteropathy (GSE: celiac disease). These RAS patients may not always have gastrointestinal symptoms or other clinical features suggestive of GSE but usually have folate de0738-081X/00/$–see front matter PII S0738-081X(00)00147-4 Clinics in Dermatology 570 PORTER ET AL. Table 1. Y 2000;18:569 –578 Characteristics of the Different Types of Recurrent Aphthous Stomatitis Sex ratio Age of onset (years) Number of ulcers Size of ulcers (mm) Duration (days) Rate of recurrence (months) Sites Permanent scarring Minor Major Herpetiform M⫽F 5–19 1–5 ⬍10 4–14 1–4 Lips, cheeks, tongue, floor of mouth Uncommon M⫽F 10–19 1–10 ⬎10 ⬎30 ⬍Monthly Lips, cheeks, tongue, palate, pharynx Common F ⬎ M(?) 20–29 10–100 1–2* ⬍30 ⬍Monthly Lips, cheeks, tongue, pharynx, palate, gingiva, floor of mouth Uncommon * Can be larger if there is a fusion of ulcers. ficiency, sometimes reticulin antibodies,50 particularly IgA class reticulin antibodies52 and/or antigliadin antibodies.53 The haplotype of HLA-DRW 10 and DQW1 may predispose patients with GSE to RAS.54 There may also be occasional patients who have RAS with no detectable clinical or histological evidence of celiac disease on jejunal biopsy, yet who may respond to dietary withdrawal of gluten.55,56 Nevertheless, the withdrawal of gluten rarely results in significant benefit60 and may simply reflect the pronounced placebo response in RAS.57 Anti-endomysial antibodies are rarely present in patients with RAS,58 thus adding weight to the evidence that RAS is not commonly associated with GSE. Patients with Crohn’s disease can have superficial ulceration similar to that of RAS.59 Food Hypersensitivities Some studies have noted an increased prevalence of atopy among RAS patients,60,61 but others have failed to find any significant correlation.62 Some patients correlate the onset of their ulcers to exposure to certain foods, but controlled studies have failed to disclose a causal role despite the fact that certain foods triggering positive skin-prick reactions will elicit pain when they are topically applied to aphthous ulcers.63,64 Dietary manipulation significantly improves RAS in only rare instances.65 Zinc Deficiency Any association between RAS and zinc deficiency seems tenuous.66 Menstrual Change A minority of women with RAS have cyclical oral ulceration related to the luteal phase of the menstrual cycle. Nevertheless, a detailed review of all pertinent literature failed to find any association between RAS and altered female sex corticosteroids.67–70 A link with autoimmune progesterone dermatitis is most unlikely.71 Psychological Illness Psychological illness has been proposed to initiate some episodes of RAS, but there are sparse data to suggest a strong link between psychological stress and RAS, or that RAS causes significant psychological upset.72–76 Genetic Factors Recurrent aphthous stomatitis may have a familial basis, perhaps more than 40% of RAS patients having a vague family history of oral ulceration. Patients with a positive family history of RAS may develop oral ulcers at an earlier age and have more severe symptoms than those with no such history.77,78 There is an increased likelihood of a child developing RAS if both parents have ulcers, and there is a high correlation of RAS in identical twins.79,80 Nevertheless, no consistent significant association between RAS and a particular serologically determined HLA antigen or haplotype has been demonstrated (reviewed elsewhere).5 This may reflect inadequate patient numbers and/or variable ethnic backgrounds of investigated patients, or most likely the lack of any immunogenetic basis to RAS. Possible Infectious Basis of RAS Bacteria An association between RAS and oral (viridans) streptoccocci has long been suggested as important in the pathogenesis of RAS, the bacteria acting either as direct pathogens or as antigenic stimuli culminating in an immunologically mediated cross-reaction with keratinocyte antigenic determinants.81,82 The initial l-form isolated from RAS patients was typed as Streptococcus sanguis,83 but later analysis disclosed that this organism was actually a strain of S. mitis,84 or rather S. oralis,85 a bacterium frequently present in the dental plaque of patients with Behcet’s disease.86 In addition, although some studies have disclosed elevated serum antibody titers to viridans streptococci among RAS patients, others have yielded contradictory results.87,88 Lymphocyte mitogenic responses to S. sanguis and S. mitis in RAS patients are not significantly different from those in control subjects.88 –90 Polymerase chain reaction (PCR) studies have also indicated that S. oralis is not specific to RAS, and thus unlikely to be of etiological significance.91 Clinics in Dermatology Y 2000;18:569 –578 It has been suggested that there is a molecular basis for the earlier work suggesting a link with S. sanguis, as monoclonal antibodies to part of the 65-kDa heat-shock protein (hsp) of Mycobacterium tuberculosis cross-react with S. sanguis. Thus RAS may be a T-cell-mediated response to antigens of S. sanguis that cross-react with the mitochondrial hsp and induce oral mucosal damage.92–94 In the absence of data showing a high frequency of a specific streptococcal infection in RAS patients, however, this proposed etiological mechanism seems unlikely. Helicobacter pylori has been detected in lesional tissue of ill-defined oral ulcers95 and by PCR in up to 72% of examined RAS ulcers96; however, the frequency of serum IgG antibodies to H. pylori is not increased in RAS.97 RECURRENT APHTHOUS STOMATITIS Table 2. Some Reported Therapies of Recurrent Aphthous Stomatitis (RAS) Mouthrinses Topical corticosteroids Antibiotics Immunomodulators Viruses An association of RAS with adenoviruses has been suggested,98 –100 but adenoviruses are ubiquitous organisms. The possible association of RAS with herpesviruses-1– 6 is reviewed elsewhere.101 Herpesvirus virions are not demonstrable in RAS,102–105 and although RNA complimentary to herpes simplex virus (HSV) has been detected in circulating mononuclear cells in some RAS patients106 and in circulating immune complexes,107 serum levels of interferon are not increased,108 HSV is not demonstrable in RAS lesions,109,110 and RAS patients are not always HSV seropositive.111 There is contradictory serological and molecular biological data on the frequency of detection of cytomegalovirus and varicella zoster infection in patients with RAS,112–115 and there is little substantive data to suggest that anti-herpesvirus antivirals such as acyclovir are of therapeutic benefit in the management of RAS.116,117 An association between Epstein-Barr virus (EBV) and the early ulcerative lesions of RAS and Behcet’s disease has been proposed, but the data are based upon a very small group of patients.118 Human herpesvirus-6 (HHV-6) DNA has not been detected in 6 of 21 RAS lesions115 and 95% of the patients had IgM antibodies to HHV-6,114 but both HHV-6 and HHV-7 DNA are rarely detected in peripheral blood moncytes of RAS patients with and without ulceration.119 Local Factors Associated With RAS Local physical trauma may initiate ulcers in people susceptible to RAS,120,121 and RAS are uncommon on keratinized surfaces122,123 or in patients who smoke tobacco.124 –127 Immunopathogenesis A review of the immunology and possible pathogenesis of RAS is beyond the scope of this clinical review. A detailed discussion of this subject can be found elsewhere.5 571 Others Chlorhexidine gluconate Benzydamine hydrochloride Carbenoxolone disodium Betadine Hydrocortisone hemisuccinate Triamcinolone acetonide Flucinonide Betamethasone valerate Betamethasone-17-benzoate Flumethasone pivolate Beclomethasone dipropionate Sucralphate Topical tetracyclines Levamisole Transfer factor Colchicine Gammaglobulins Azathioprine Dapsone Thalidomide Pentoxifylline Prednisolone Azelastine Alpha-2-inteferon Cyclosporine Amlexonox 5-Aminosalicyclic acid Systemic zinc sulphate Monoamine-oxidase inhibitors Sodium cromoglycate Deglycyrrhizinated licorace Etretinate Low-energy laser Management of RAS A systematic review of the management of RAS is available.128 Patients with oral ulceration possibly associated with systemic disease require referral to an appropriate specialist.5 All patients should be advised to use an oral hygiene procedure that is as atraumatic as possible, and all dental appliances should fit well and be non-tissue-damaging. Hematinic Replacement The correction of any hematinic deficiency is of limited benefit unless the cause is corrected.129 Zinc sulphate therapy is not effective,130 and LongoVital®, a herbalbased vitamin tablet with a wide range of trace elements, seems to be of limited benefit.131 Topical Antimicrobials Chlorhexidine used as a 0.2% w/w mouthrinse or 1% gel can reduce the duration of ulcers and increase the number of ulcer-free days.132–135 (Table 2) One study, however, found little objective value of chlorhexidine gluconate mouthrinse over placebo in the management of RAS.136 Regular use of chlorhexidine gluconate may Clinics in Dermatology 572 PORTER ET AL. cause exogenous dental staining, and the bitter taste may limit compliance. Topical tetracyclines (eg, aureomycin, chlortetracycline, and tetracycline) may reduce healing times and/or reduce the associated pain of RAS,137–141 but they may cause dysgeusia, oral candidosis, and a burning-like sensation of the pharynx, and they are not suitable for young children who might ingest them, with resultant tooth staining. Topical Corticosteroids Topical corticosteroids remain the mainstay of RAS treatment in most countries,142 although there are few well-controlled studies of their precise efficacy.128 A wide range of different topical corticosteroids may reduce symptoms.143–150 Topical Analgesics Benzydamine hydrochloride mouthwash is of no more benefit on ulcer healing than placebo194; nevertheless, it (or lignocaine gel) can produce transient relief of pain. Toothpastes Toothpastes that enhance the salivary peroxidase system are not effective.141,151,152 It has been suggested that elimination of sodium lauryl sulphate (SLS) can reduce or prevent RAS,153 but although one later study confirmed this,154 another did not.155 Other Topical Agents Sodium cromoglycate lozenges may provide mild symptomatic relief,156,157 but cromoglycate-containing toothpaste is of no benefit.158 Carbenoxolone sodium mouthwash reduced the severity of RAS in one study.159 Topical immunomodulatory agents that have been suggested to be of some benefit in the management of RAS include azelastine,160 human alpha-2-interferon in cream,161,162 topical cyclosporine,163 deglycyrrhizinated licorice,164 topical 5-aminosalicylic acid (5-ASA),165 and prostaglandin E2 (PGE2) gel.166 There have been several studies of the efficacy of amlexanox in the management of RAS,167–169 including one detailed randomized controlled study168 suggesting that the 5% paste may significantly reduce the pain and time of healing of RAS ulceration. A cross-over study found that sucralfate reduced the duration of symptoms and improved duration of remission of RAS.170 A previous study did not report sucralfate to be clinically useful,171 although a recent investigation of Italian patients suggested that 20% sucralfate is of some benefit in reducing the symptoms of RAS.172 Cimetidine has found favor with some workers128. Y 2000;18:569 –578 Physical Therapies Surgical removal, debridement, or laser ablation of ulcers is not practical and is of very limited practical benefit.173–175 The efficacy of a chemical cautery agent (Debacterol) is unclear.176 Systemic Therapies Systemic immunosuppression is sometimes warranted in view of the limited efficacy of topical agents, and the sometimes profound pain and/or long-standing ulceration; however, whereas many such agents have been proposed to be clinically useful, there is little evidence base. Prednisolone and/or Azathioprine Systemic prednisolone177 and azathioprine178 have been suggested to be effective, but there are no detailed published studies on their precise clinical benefits. Levamisole Levamisole rarely causes objective clinical improvement,179 and the associated adverse effects (nausea, hyperosmia, dysgeusia, and agranulocytosis) discourage its use.180 –186 Colchicine Colchicine has proved clinically beneficial when investigated in small groups of patients with RAS,187,188 and in an open study of 20 patients, colchicine (1.5 mg/day for 2 months) caused a significant reduction in pain scores and frequency of self-reported ulcers.189 Unfortunately, not all patients benefit from colchicine therapy, and at least 20% can have painful gastrointestinal symptoms or diarrhea.189 Long-term use can induce infertility in young men. Combined colchicine and thalidomide therapy may occasionally benefit recalcitrant RAS.190 Pentoxifylline Results of limited open studies suggest that pentoxifylline (400 mg three times daily) may significantly reduce the number of RAS for up to 9 months after a month of therapy.191–195 The results of a recent study, however, did not confirm that pentoxifylline reduces the recurrence of RAS when therapy is stopped.196 About 10% of patients will have some degree of gastrointestinal upset with pentoxifylline therapy. Dapsone Dapsone has been reported to reduce the oral lesions in a few patients with RAS-like lesions, but the clinical features of this group of patients were poorly described.197 Clinics in Dermatology Y 2000;18:569 –578 RECURRENT APHTHOUS STOMATITIS Thalidomide Thalidomide remains the most effective agent for the management of RAS, producing a remission in almost 50% of treated patients in one randomized controlled trial.198 Open and double-blind studies of patients with HIV-related oral ulceration199,200 and in non-HIV-related RAS,201 and in several case studies, all confirm that thalidomide is of clinical benefit.202–204 Thalidomide gives rise to mild adverse side effects (eg, intolerance, loss of libido) in up to 75% of treated patients, and polyneuropathy can arise in about 5% of cases. Clearly the risk of teratogenicity also limits the clinical application of thalidomide in the management of RAS. Other Agents Transfer factor205 and gammaglobulin therapy206 have been suggested to be beneficial, but more detailed studies are needed to confirm these preliminary observations. The reported clinical benefit of monoamine oxidase inhibitor therapy in the treatment of three patients with RAS207,208 was probably due to accompanying dietary modifications rather than any alteration in psychological status. 8. 9. 10. 11. 12. 13. 14. 15. 16. Conclusions Recurrent aphthous stomatitis remains a common oral mucosal disorder in most communities of the world; however, as its precise etiology (or etiologies) remains unknown, therapy is nonspecific and often of limited efficacy. Fortuitously, patients with RAS are generally otherwise quite well. 17. References 20. 1. Pongissawaranun W, Laohapand PP. Epidemologic study on recurrent aphthous stomatitis in a Thai dental patient population. Community Dent Oral Epidemiol 1991;19:52–3. 2. Field EA, Brookes V, Tyldesley WR. 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