Nystatin-Added Tissue Conditioners for DIS: History
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Subjects: Dentistry, Oral Surgery & Medicine
Contributor:
Muhammad Saad Shaikh

Denture-induced stomatitis (DIS) represents a pathological condition caused by ill-fitting dentures trauma, manifested as inflammation of the palatal tissue beneath the denture. The fungal infec-tions are the principal contributory factors to DIS. Although the aetiology of DIS is multifactorial, the Candida albicans fungal infection remains the main cause.

  • antifungal
  • nystatin
  • tissue conditioner
  • prosthesis
  • Candida albicans
  • denture-induced stomatitis

1. Introduction

Denture-induced stomatitis (DIS) is a pathological condition that affects the denture bearing mucosa as a result of trauma from ill-fitting dentures [1][2]. DIS affects a considerable proportion of denture wearers [3]. The primary causal factor of DIS include fungal infections, caused by the Candida species, particularly Candida albicans [4][5][6]. Nevertheless, the aetiology of DIS can be multifactorial, as other important risk factors, including poor oral hygiene and consistent night-time denture wearing [7], dry mouth [8][9], denture trauma [10], and variation in salivary pH [11], have been considered to be linked with DIS. Almost two-thirds (65%) of upper complete denture wearers are affected by this lesion. In the majority of the cases, it is asymptomatic but may present with symptoms of pain, halitosis, pruritus, the presence of erythema/oedema, and burning of the palatine mucosa and gingiva under the denture base [12]. The main diagnosis of the DIS is based on these clinical findings. However, according to some clinicians/researchers, the association of DIS with candidiasis is also considered essential during the diagnosis [13]. For patients with symptoms like angular cheilitis/stomatitis, and any other local/systemic lesion, additional diagnostic tests like blood pictures, smears/culture, and, rarely, biopsy of the site may be advised [14][15]. Common signs of DIS are generalised inflammation or a reddish appearance of the hard palate beneath the denture and is much more usual in complete denture wearers. Among the normal oral flora, Candida albicans (C. albicans) is seen in 40% of the individuals, being part of the dental plaque formation [16]. In certain situations, C. albicans adhering to the constantly worn base of denture results in DIS [17]. In terms of oral fungal infections, C. albicans is the most abundant species and leading pathogen that contributes to the development of DIS [18][19]. Besides, Candida tropicalis and Candida glabrata [20] are usually related to the hard palate and the denture surface of healthy denture wearers [21][22].

There is an antifungal protection present in human saliva attributed to the oral antimicrobial peptides [23], but in some conditions—for example, poor oral hygiene—this antifungal defence may not be sufficient. In those cases, denture wearers may require an appropriate treatment. As a result of multifactorial aetiology, the treatment of C. albicans-related DIS is complicated [24][25]. Several therapeutic modalities have been proposed [24]. The conventional therapies for the treatment of DIS include a local/topical application or oral intake of various antifungal drugs, such as Fluconazole, itraconazole, nystatin, amphotericin B, ketoconazole, and clotrimazole, in addition to the use of mouth washes such as chlorhexidine digluconate (0.12%) [26]. The efficacy of these medications ranges from 77% to 100% for a clinical and microbiological cure of DIS [27]. Fluconazole and nystatin are the relatively more commonly used drugs for a DIS cure. Fluconazole showed a positive response of 89%, but many relapses were seen in the cases treated with it [28]. Nystatin, in comparison, was shown to be more potent in DIS, with a higher clinical and mycological cure rate and is now considered the standard topical treatment for oral candidiasis [27]. Fungi resistant to nystatin are rare, and also, its cost/availability makes it the drug of choice [29]. However, these treatment options are more or less supportive and may not be beneficial for every individual [30][31][32]. Photodynamic therapy and the use of nanoparticles are some of the latest/recent treatment modalities used for the cure of DIS. Methylene-blue, toluidine-blue, and porphyrin have been used as photosensitisers in these therapies, for which the results are promising [33]. Some researchers have incorporated nanomaterials such as silver-nanoparticle discs in denture bases for the prevention/treatment of DIS. The results indicated a significant reduction in the adherence of C. albicans [34].

For the conditioning purpose of the denture bearing mucosa, resilient tissue conditioners (TCs) are commonly used. TCs reduce the load endured by denture bearing mucosa, and they also work as a cushion beneath the dentures [35]. Besides, TCs are used as drug delivery carriers [35][36]—for instance, the delivery of antifungal agents for the inhibition of C. albicans [37][38]. Due to cognitive impairment, memory loss, and decreased motor activity in geriatric patients, the application of topical antifungal medicaments in DIS patients is challenging. Moreover, maintaining an effective and sustained release of topical antifungal agent is also difficult. Due to regular ingestion and persistent salivary washout, the antifungal drugs are less likely to adhere with the oral mucosa [39]. To overcome these issues, a lot of of research has investigated the efficacy of TCs modified by the addition of various antifungal medicaments, such as nystatin [40][41][42][43][44][45][46][47], derivatives of the azole group [40][41][42][43][44][45][46][47], and chlorhexidine [44][45][46][47][48].

Polyenes, including nystatin, are the main choice for the management of primary oral candidal infections [49]. Nonetheless, there are associated unwanted effects, such as a bitter taste, nausea, mucosal irritation, and poor acceptance by patients [50]. Different studies have investigated the modified TCs with nystatin associated with efficacy [51] drug delivery, dimensional alterations and stability [52][53][54][55][56][57][58], and the stability and time period of the antifungal actions. While there are plenty of studies published, the impact of nystatin in addition to TCs to treat DIS is still not conclusive. Therefore, the aim of the present review was to determine the antifungal potency of nystatin when used with different types of TCs for managing patients with DIS. Additionally, the different properties of TCs influencing its effectiveness were reviewed.

2. Discussion

The results from the studies evaluated suggest that the majority of them showed favourable outcomes for adding nystatin to TCs. The treatment of DIS is both multifactorial and complicated, taking into consideration the contributing and aetiological factors. The denture base materials with added nystatin proved to be a successful treatment modality for cases with DIS . Douglas and Walker (1973) introduced the concept of using nystatin in denture liners around four decades ago. Following that, a significant level of research has been performed to enhance the effectiveness, as well as efficacy, of nystatin added to TCs [78]. The use of nystatin has been commonly documented for the treatment of oral candida infections such as DIS [79][80][81][82]. Likewise, nystatin has been widely used with a variety of TCs and exhibited very favourable results related to the reduction of fungal growth.

A study conducted four decades ago showed an effective antifungal activity of nystatin added to various TCs [59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77]. In another study, nystatin was steadily released from the TCs to the saliva, lessening the salivary yeasts for a limited time period . Furthermore, in a recent animal study, the in-vivo biocompatibility of DIS was determined due to the fact that incorporating nystatin into the TC did not induce histopathological variations in the rat palatal mucosa . More lately, the growth kinetics of C. albicans were investigated, and the results showed a maximum effectiveness for the antifungal nystatin rather than the other antifungals. Concerning the effective stability and time duration of nystatin added to TCs, the studies ranged between three days to one week or to a maximum of two weeks.

The stability and duration were directly controlled by several factors, including the chemical nature and concentration. Regarding the nystatin concentration, different studies used different concentrations, varying from 500,000 U to 1,000,000 U; therefore, no agreement has been given related to an effective nystatin concentration. However, most of latest studies reported different units of measurement for the nystatin concentrations, i.e., 0.032 g. This variability between the doses and units of measurements in nystatin made it difficult to conduct a meta-analysis.

Beside nystatin, other antifungal medicaments have also been assessed for their antifungal potency, including the derivatives of the azole group, i.e., clotrimazole, fluconazole, itraconazole, ketoconazole, and miconazole [83]. These drugs are very comparable to nystatin in terms of efficacy and antifungal activity.

For the treatment of mucosal lesions, nystatin is considered to be both a safe and potent antifungal for topical, as well as systemic, applications. Nystatin is one of the drugs of choice to treat oral infections of fungal origin. Though the topical application of nystatin is considered to be effective and safe, a prolonged systemic use can lead to detrimental effects on the liver and kidneys. The topical application of nystatin is potent against a fungal infection invading the superficial tissues, but this can be linked to a few adverse effects, such as bad taste and the requirement of repeated applications. This, in turn, may lead to inadequate patient compliance, influencing the treatment outcomes further.

The topical application of nystatin four times per day for two weeks was effective in the treatment of DIS. Furthermore, the concurrent administration of suspension and nystatin tablets for 15 days yielded a higher rate of clinical, as well mycological, cures in comparison to a monotherapy. A topical nystatin application in combination with amphotericin B also demonstrated a considerable clinical result [84]. Finally, while comparing the nystatin and fluconazole efficacy in the management of DIS, it was summarised that nystatin is the standard topical treatment for oral candidiasis, with the total inhibition of both the binding and colonisation of C. albicans. The uncommon presence of nystatin-resistant fungi and its affordable cost are the other advantages of this drug compared to other antifungals. Hota et al. advocated the biocompatibility and feasibility of the incorporation of chlorhexidine and nystatin to the TCs for the treatment of DIS, as no histopathological changes were observed in the palatal mucosa of rats.

Moreover, the studies reported different effective durations, which were based on the type of TCs used with nystatin, such as two days, three days, one week, and two weeks. Taking into consideration the results of the analysed papers, an efficacious time period of one to two weeks may be recommended to get adequate results of the nystatin therapy. Nevertheless, an ideal time period of nystatin added to the TCs for achieving the desired outcomes may not be determined to date and necessitates more research in this area. A study reported that the yeasts completely disappeared following 15 days of nystatin treatment [85]. Nevertheless, few studies reported a faster fungal regrowth in both the oral cavity and alimentary tract [85][86]. Following two weeks of nystatin withdrawal, the fungal colonies on the base of the dentures and denture-bearing mucosa were similar to those found initially. This fungal regrowth can be reduced if nystatin is administered over a longer period, such as four–six weeks [87]. Therefore, for the treatment of DIS, the exposure of the antifungal for a long time period is needed. Adding to that, the overuse of nystatin is not free from adverse effects and the development of resistant strains of the fungus [88][89][90]. Among the various medicaments, nystatin and chlorhexidine remain the most incorporated medicaments in the TCs for the treatment of DIS [91].

The studies included in the present review analysed altered TCs by their nystatin addition. This addition may interfere the setting reaction of TCs or alter the mechanical and physical characteristics. For achieving the ideal results, the properties of TCs should not be disrupted because of a nystatin addition. Certain studies demonstrated no alterations in the mechanical properties—for example, tensile strength, water sorption and solubility, porosity, peel bond strength, and hardness and roughness [72]. On the contrary, one study exhibited slight alterations in the hardness, as well as roughness, with the passage of time.

This variation in the outcomes may be attributed to the different concentrations and materials of the applied nystatin. Apart from that, the additive particle size may also impact the drug filtering from the plasticised matrix of the TCs. For instance, the high surface area and reactivity of nanoparticles may lead to an acceleration of the drug release [92]. While nystatin and TCs with varied strengths were examined, the outcomes of the papers revealed no-to-slight modifications in the mechanical, as well as physical, characteristics of the TCs. Nonetheless, additives may probably affect the properties of materials if they impede the TC polymerisation or react chemically.

Few limitations pertain to this current systematic review. The studies reported a broad range of heterogeneity considering the methodology, outcomes, nystatin concentrations, and dimensional variations of the TCs. These variations did not permit a meta-analysis and, consequently, the application of the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) approach, which is the most commonly adopted tool for grading the quality of evidence and for making recommendations of quantitative data for each outcome. Out of the included studies, only a limited number of studies were in-vivo experiments (one animal and three clinical). Most of the studies were in-vitro laboratory-based studies with or without imitating clinical situations. Moreover, a quality assessment of the in-vitro studies could not be conducted, as there was no standard tool available for a critical appraisal of the in-vitro studies.

This entry is adapted from the peer-reviewed paper 10.3390/prosthesis3010007

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