Abstract
Background
Candida is a heterogeneous fungal genus. Subgingival sulcus is a refuge for Candida, which has already been related to the pathogenic inflammation of periodontitis. This work aims to review the presence of Candida in the sulcular fluid surrounding dental implants and discuss its potential role in peri-implantitis.
Results
A bibliographical research was performed in PubMed, Scopus and Web of Science databases, with the keywords candida, peri-implantitis, periimplantitis, “dental implant” and implant. Newcastle-Ottawa Scale was used to assess the methodological quality of the included studies. At the end, nine observational studies were included, which analysed 400 dental implants with PI and 337 without peri-implantitis. Presence of Candida was assessed by traditional microbiological culture in blood agar or/and CHROMagar, though identification was also detected by quantitative real-time PCR, random amplified polymorphic DNA or ATB ID 32C. Dentate individuals and implants with peri-implantitis (range, 3–76.7%) had a bigger presence of Candida. C. albicans was the most isolated species, followed by Candida parapsilosis, Candida tropicalis, and Candida dubliniensis.
Conclusion
Candida is part of the microbiological profile of the peri-implant sulcular fluid. More studies are needed to compare the link between Candida and other microorganisms and to discover the true role of these fungi in peri-implantitis.
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Background
Oral rehabilitation with dental implants is a predictable and safe therapeutic procedure to treat tooth loss, in both partially and completely edentulous patients. Throughout the years, more advances have been made in the design, surface and chirurgical protocols of the implant systems, whose success can reach up to 95% of cases [1, 2].
Mechanical and biological complications are the main cause of dental implant failure. Peri-implantitis (PI) is a multifactorial infectious disease characterized by inflammation in the peri-implant mucosa and a progressive loss of supporting bone [3]. Although inflammatory response is more pronounced in the tissues surrounding the implants than in those surrounding the teeth [4], the microbiological environment associated to PI is similar to the observed in conventional periodontal disease, which includes anaerobic Gram-negative bacteria, such as Prevotella nigrescens, Campylobacter rectus and Aggregatibacter actinomycetemcomitans [5]. Other microorganisms, for example fungi, like Candida, could also participate in the onset and development of PI, since Candida colonization and biofilm formation is relatively common on other metallic surfaces, like hip and knee prostheses [6, 7]. However, there is a direct association between surface roughness and hydrophobicity with biofilm development as surface topography influenced microbial adhesion. For instance, titanium is one of the biomaterials most resistant to microbial colonization and to the development of C. albicans and bacterial biofilms [8].
Candida is a commensal of the oral cavity that can be isolated from many healthy individuals but can trigger mucosa infections (candidiasis) associated to different predisposing factors, like immunodeficiency [9]. Subgingival sulcus can also play as a refuge for pathogenic fungi [10]. In addition, different species of Candida have already been associated with the maintenance of periodontal inflammation in periodontitis [11, 12]. Nevertheless, the mechanisms by which Candida may enhance bone resorption, especially in the jaws, are unclear.
Candida albicans is the species more frequently isolated in PI, developing thick biofilms over the peri-implant surface [10]. Given its ability to adhere to the implant area in intimate contact with the bone, it has been hypothesized that Candida could also contribute to the progression of PI, but this link has yet to be elucidated.
The objective of this work is to make a systematic review of the literature, aiming to recognize the presence of different species of Candida in the peri-implant niche and to discuss its role in the pathogenesis and progression of peri-implantitis.
Methods
Research strategy
The methodological design of this study matches the PRISMA criteria and guidelines [13]. In this systematic review, we address the question “what is the role of Candida in the development of peri-implantitis?”.
Two independent co-authors (ILIM, ACG) performed a systematic bibliographical research in PubMed (US National Gallery of Medicine), Scopus and Web of Science/Knowledge. The search strategy consisted in different combinations of the MeSH keywords: Candida, peri-implantitis, periimplantitis, “dental implant” and implant (candida AND peri-implantitis; candida AND periimplantitis; candida AND dental implant; candida AND implant).
Inclusion and exclusion criteria
Inclusion criteria were studies published in English or Spanish until December 2020 in patients with dental implants and diagnosis of PI and/or analysing samples from the sulcular fluid surrounding dental implants. Among exclusion criteria were case reports, reviews, position papers, and author opinions. Moreover, those studies not available in full format and experimental studies were also excluded.
Selection of the studies and data collection
The study selection and data extraction were also performed by two reviewers (JMAU and ILIM). A third one (JMAU) participated in the decision-making in case of doubt about the inclusion of the studies. Also, if essential data for the review was missing or unclear, the corresponding author clarified the problem.
The titles and abstracts of the retrieved references were screened for relevance and after this, the full texts of all articles potentially eligible were analysed against the inclusion/exclusion criteria. In order to collect the information of the different studies retrieved, a standard document was utilized for data regarding authors, year of publication, study design, diagnostic criteria, clinical specimens, implant systems used, and microbiological methods. In addition, quantitative data on the isolation of Candida and other microorganisms were collected for both peri-implantitis and healthy implants.
For categorical variables, we performed a descriptive statistical analysis to obtain frequencies and percentages, as well as to determine the average and standard deviation for quantitative variables.
Risk of bias
A modified Newcastle-Ottawa Scale (NOS) was used to assess the methodological quality of the included studies [14]. This system analyses the risk of bias of nonrandomized studies, taking into account three domains and eight items for cohort studies: selection, comparability and outcome. The total maximum score is 9; a study with a score from 7 to 9 has high quality; 4 to 6, high risk of bias; and 0 to 3, very high risk of bias.
Results
Bibliographical search and retrieval
The selection process of search and retrieval of literature is showed in Fig. 1. Initially, 1185 records were retrieved from databases, from which 41 were excluded due to not being published in English or Spanish, 131 because they were not made in humans and 87 for being duplicates. Thus, 926 articles were screened, but 691 were eliminated because they did not study the presence of Candida in dental implants, another 210 for being case reports, reviews or author opinions and other 10 for not being available in full-text.
After the detailed analysis, 15 articles studying the presence of Candida in patients with dental implants were included. However, during the extraction data process, we saw that only nine of them compared patients with and without PI, which accounted for the 0.78% of the initial number (Table 1) [10, 15–22]. So, the remaining six manuscripts were discarded since they studied patients with dental implants but without diagnosis of the peri-implant status [2, 23–27].
Clinical and microbiological characteristics of the included studies
The microbiological analysis was performed, in all the studies, collecting samples from the sulcular fluid with sterile paper points for different periods. Presence of Candida was assessed by traditional microbiological culture in blood agar [16, 17] or/and CHROMagar [10, 18, 22, 23]. Identification of clinical isolates of different Candida species was also detected by either quantitative real-time PCR [19, 21], random amplified polymorphic DNA [22] or ATB ID 32 [18]. In all cases, the patients had not taken antibiotics, at least 2 months before taking the samples.
These studies analysed 626 patients, 361 with PI (57.7%) and 265 without PI (42.3%), whose mean age varied between 53 and 67 years. Data about gender was available in 5 studies [10, 18, 19, 21, 23], from which 20.3% were women (38 with PI and 33 without PI) and 79.7% (162 with PI and 117 without PI) men. Curiously, two articles from Saudi Arabia did not include female patients [10, 23]. In total, 737 patients wearing dental implants were investigated, 400 (54.3%) with peri-implantitis and 337 (45.7%) without PI (Table 1).
Only one study did not found Candida in the sulcular fluid [17]. The rest of the studies recognized a bigger presence of the fungi in the implants with PI (range, 3–76.7%), in contrast to healthy ones (range, 9–50%) [15, 16, 18, 19, 21,22,23]. Dentate patients also had more Candida in their implants than edentulous ones [16, 19]. Fungal colonization was observed only in dental implants with PI in three studies [15, 16, 18].
C. albicans was the most isolated species, followed by Candida parapsilosis, Candida tropicalis, Candida dubliniensis, Candida boidinii, Candida guilliermondii, Candida krusei and Candida lusitaniae (Table 2). Rosenberg et al. [15] did not indicate the species of Candida. Most of the authors reported presence of C. albicans, as well as C. boidinii, C. dubliniensis, C. parapsilosis, C. tropicalis, C. guilliermondii, C. krusei and C. lusitaniae [10, 21,22,23]. None of the authors stated if these were pure or polifungal Candida biofilms [10, 21,22,23]. C. albicans alone was observed in three studies [16,17,18].
Risk of bias in individual studies
After applying modified NOS assessment, 22.2% of the studies revealed 9 stars, 44.5% of them 8 and 33.3% of them 7 (Table 3). Overall, risk of bias was low.
Clinical and microbiological characteristics of the excluded studies
The six articles excluded in this review analysed the presence of Candida in the sulcular fluid surrounding 362 dental implants [2, 23–27]. In most reports, C. albicans was isolated [2, 23, 25, 26]; however, C. dubliniensis, C. glabrata, Candida kefyr and Candida norvegensis were also observed [20, 24, 26] (Table 4). The presence of Candida was variable, affecting between 10 and 71% of the implants. The study of Peñarrocha et al. [24] was the only one in which no Candida was observed in the implants investigated. This absence of Candida colonization might be related to the small sample size (20 patients) and to the fact that they look for the presence of C. albicans and no other species of Candida.
Gomes et al. [26] described that the quantity of Candida was bigger at 8 months was higher than that observed at 4 months after implant placement. Mencio et al. [2] only observed the presence of C. albicans in implants with cemented implant-abutment connections but not in those with screwed implant-abutment connections. In addition, Kilic et al. [23] found more Candida colonization in patients with bar-retained overdentures (25%) than in those with locator-retained overdentures (19%) (Table 3).
Discussion
Candida is a heterogeneous fungal genus composed by more than 150 species. Although some species of Candida coexist as human commensals, they can cause superficial and systemic infections under certain circumstances [28]. Most candidiasis are caused by C. albicans, but in the recent years other non-C. albicans species have manifested a pathogenic capacity. Among the most frequently isolated from clinical specimens are Candida glabrata, C. parapsilosis and C. tropicalis [29].
The pathogenicity of Candida responds to a set of virulence factors, including dimorphism, secretion of hydrolytic enzymes (proteases, lipases and haemolysins) and adhesion and biofilm formation on the mucous epithelium and on medical devices [30, 31]. Formation of biofilms is a complex sequential process that depends on the invasive agent and the structure on which it is hosted [32]. Yeast colonization of biotic and abiotic surfaces is the first step in the development of biofilms, followed by cell division and microcolonies generation that contribute to the maturation of a biofilm characterized by the presence of hyphae and yeasts (sessile cells) embedded in an extracellular matrix and, finally, the detachment of some of these cells [33]. The release of planktonic cells into the environment allows them to colonize new surfaces and to develop new foci of candidiasis.
Because the diagnostic criteria of the peri-implant diseases have been in constant change, the diagnosis of peri-implantitis in the included studies have differed from one to another, due to being published over a long period of time, from 1991 to 2020. Yet most of the reviewed studies collected data about bleeding and/or suppuration on probing, probing depth and radiographic bone loss. Moreover, implant mobility and presence of keratinized mucosa was evaluated in three studies [15, 16, 20, 21]. For all these reasons, although it cannot be guaranteed that all the implants studied in this work have been correctly categorized as healthy or diseased, the margin of error could not be very wide [5, 34, 35]. In regards to the risk factor of PI, none of the studies excluded patients with history of periodontitis and two discarded smokers [10, 22]. Still, only one of the nine selected articles did not state whether they found Candida or not [17].
According to the included studies of this review, implants with peri-implantitis (range, 3–76.7%) had a higher presence of Candida than those without peri-implantitis (range, 9–50%). However, we do not know why prevalence of Candida was significantly bigger in the studies with individuals form Saudi Arabia [10, 22]. Since fungal assessment and sample size were similar to other studies [16, 18], we believe these particular results may be related to special geographical and sociocultural factors, such as diet, and the fact that these authors excluded female patients and smokers [10, 22].
Moreover, the fact that 10–71% of implants, regardless of peri-implantitis, showed the presence of this fungus demonstrates that colonization of Candida in the peri-implant environment is independent of the disease. Also, because a slightly higher number of patients with bar-retained overdentures had Candida, in contrast to locator-retained overdentures, time and hygiene of implants might also be important factors of fungal colonization.
Schwarz et al. [20] were the sole authors to state a direct relationship between Candida and other microorganisms. Thereby, from three implants with PI, C. boidinii was isolated alongside Mycoplasma salivarum, Veillonella parvula, Porphyromonas gingivalis, Parvimonas micra and Tannerella forsythia in one of them, and in the other two, C. albicans was also found with V. parvula, T. forsythia, M. salivarum, P. gingivalis and P. micra. On the other hand, C. dubliniensis was accompanied by M. salivarum, V. parvula, Staphylococcus aureus, P. micra and T. forsythia in one healthy implant. The latter species of Candida, C. dubliniensis has been isolated from patients suffering from different oral pathologies, resembling C. albicans in many virulence factors including hypha formation and hydrolytic enzyme production [36, 37]. In this context, Candida colonization could be linked to the presence of other periodontopathogens, like T. forsythia, P. micra or P. gingivalis. Although the exact role of Candida in the beginning of the peri-implant disease is unknown, we believe that this fungus could play an important function in the latter stages of PI, when the bacterial microenvironment is already established, as demonstrated in experimental studies [38].
Knowledge of the involvement of Candida infection in disorders of bone remodelling is limited, but it has been described in Candida arthritis and osteomyelitis [39, 40], nosological entities described very rarely in the jaws [41, 42]. Candida arthritis and osteomyelitis develop by haematogenous invasion, mainly in patients with immunodeficiency, being C. albicans is usually the most frequently isolated, although C. tropicalis, C. glabrata and C. parapsilosis has also been isolated [40]. As in the latter processes, Candida would act as a modifying agent in chronic inflammation around dental implants that activates the bone resorption response.
Anaerobiosis, as occurs in peri-implant pockets, can promote the virulence of C. albicans, increasing the activity of secreted aspartyl proteinases (Sap) [43]. These Sap proteins are associated to Candida adherence, tissue damage and modulation of immune response, maintaining inflammatory stimuli that attract other periodontopathogens [44, 45]. This role of Saps is important because the ability to form thick biofilms is easier for C. albicans, both under aerobic and anaerobic conditions, whereas for the rest of the species of Candida, growth is much greater only under aerobic conditions [46]. C. albicans hyphae secrete candidalysin, a 31-amino-acid peptide toxin that damages the epithelial cells and has an immunomodulatory capacity by binding to epidermal growth factor receptor (ErbB1 or Her1) [47]. Yeast and hyphal morphologies are present during asymptomatic C. albicans colonization of human mucosal surfaces. However, hypha formation can lead to candidalysin secretion, tissue damage and immune modulation (Fig. 2). Furthermore, C. albicans 95-kDa metallopeptidase, localized in cell wall, owns the capacity to destroy different elements of the peri-implant soft and hard tissues like type I collagen (connective tissue, alveolar bone and cement), type IV collagen (basement membrane of the mucosa), fibronectin (periodontal ligament) and laminin (basement membrane of the mucosa and cement) [48,49,50].
Interestingly, one study [22] pointed that patients with dental implants in which Candida was isolated, also had a higher presence of these fungi at the buccal, lingual and palatal mucosa. Although this study did not differentiate between implants with and without PI, it evidences the existence of an oral reservoir for Candida that facilitates the entry of this fungus into the peri-implant sulcus.
This systematic review has limitations. First, only nine studies analysed the presence of Candida in patients with peri-implantitis including very heterogeneous samples (range, 20–126 studied specimens). Second, few studies reported the number of Candida colony-forming units (CFU), which is a fundamental data for the mycological analysis [9, 51]. Alrabiah et al. [10] showed significant differences in the quantity of Candida between specimens from patients suffering PI (3147.54 CFU/mL) and from patients without PI (496.68 ± 100.2 CFU/mL). These findings are similar to those found by Alsahhaf et al. [22] (2316.26 vs 177.6 CFU/ml). Third, it was impossible to analyse the differences of Candida in patients with PI, regarding the type, composition, design and surface of the implants, because only Leonhardt et al. [16], said that their implants were Nobel Biocare AB (Gothenburg, Sweden). We are convinced of the importance of studying the implant characteristics, since they can be strongly related to colonization and infection, according to how they allow Candida adherence. There is a strong association between implant properties and microbial adhesion, titanium being one of the most resistant to Candida colonization and biofilm development [8]. Moreover, there is a considerable heterogeneity of the selected studies regarding the microbial methods and study design then results obtained from different microbiological methods did not allow for a direct comparison.
Conclusions
In summary, Candida is a common inhabitant of the peri-implant sulcular sulcus microbial environment, both in healthy implants and in those from people suffering from PI. However, Candida presence is more common in peri-implantitis. This presence and the Candida concentrations in the peri-implant tissue can be related to the lapse of time dental implants have been in the oral cavity. In addition, the quantity of Candida in the sulcular fluid surrounding the implants might rely on the presence of other periodontopathogens, such as V. parvula, T. forsythia, M. salivarum, P. gingivalis or P. micra. Although, C. albicans, C. parapsilosis and C. tropicalis are the most common species in peri-implantitis, others have also been identified, such as C. dubliniensis, C. boidinii, C. guilliermondii, C. krusei and C. lusitaniae, but in a very low frequency. Better-designed studies are needed, with larger patient samples, to unravel whether there is a relevant role for Candida in the etiopathogenesis of peri-implantitis and dental implant failure.
Availability of data and materials
All data generated or analysed during this study are included in this published article [and its supplementary information files].
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ILIM made substantial contributions to the conception and design of the work and acquisition, analysis, and interpretation of data. ACCG contributed to the conception of the work and of data. GQA contributed to interpretation of data and substantively revised the draft. JMAU made substantial contributions to the conception of the work, interpretation of data, and substantively revised the draft. The authors read and approved the final manuscript.
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Irene Lafuente-Ibáñez de Mendoza, Amaia Cayero-Garay, Guillermo Quindós-Andrés and José Manuel Aguirre-Urizar declare that they have no competing interests.
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Lafuente-Ibáñez de Mendoza, I., Cayero-Garay, A., Quindós-Andrés, G. et al. A systematic review on the implication of Candida in peri-implantitis. Int J Implant Dent 7, 73 (2021). https://doi.org/10.1186/s40729-021-00338-7
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DOI: https://doi.org/10.1186/s40729-021-00338-7