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REVIEWS |
1 Oral Medicine, Division of Maxillofacial Diagnostic, Medical & Surgical Sciences, Eastman Dental Institute for Oral Health Care Sciences, UCL, University of London, 256, Grays Inn Road, London WC1X 8LD, UK;
2 Community Dental Department, Coventry NHS Primary Care Trust, Abbey View, 271 London Road, Coventry, West Midlands CV3 4AR, UK;
3 Department of Nephrology, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, West Midlands CV2 2DX, UK; and
4 Health Services Research, Eastman Dental Institute for Oral Health Care Sciences, UCL, University of London, 256, Grays Inn Road, London WC1X 8LD, UK;
* corresponding author, S.Porter{at}eastman.ucl.ac.uk
| ABSTRACT |
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KEY WORDS: chronic dental oral renal
| (I) INTRODUCTION |
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| (II) CHRONIC RENAL FAILURE |
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| (III) EPIDEMIOLOGY |
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The death rate is 178, 189, 217, and 209 per 1000 patient years (pyr) in the USA, Australia, New Zealand, and the UK, respectively (Table 1
). These figures suggest that the USA has a lower death rate than the UK, but the USA data do not include deaths in the first 90 days following the onset of chronic renal failure. However, the UK death rate at 1 year and 90 days (188/1000 pyr) is comparable with that in the USA. There are only slight differences in the death rates between genders. Ethnicity also affects death rate: In the USA, it is lowest in Asians (130/1000 pyr) and highest in Caucasians (193/1000 pyr).
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The most common cause of death is cardiac failure, followed by infection and malignancy (Ansell and Feest, 2002; McDonald and Russ, 2002; US Renal Data System, 2002). Diabetes mellitus and hypertension greatly increase this risk (Santiago and Chanzan, 1989).
| (IV) CLINICAL FEATURES |
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| (V) TREATMENT OF CHRONIC RENAL FAILURE |
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Dietary and fluid restrictions may be required to accommodate the reduced excretory capacity of the kidneys. Acidosis and increased levels of potassium can be treated by reducing dietary intake of potassium-rich foods, such as bananas, and sodium restriction can aid the control of hypertension. It is sometimes necessary to reduce protein consumption to minimize nitrogenous waste products. Despite this treatment, most patients progress to end-stage renal failure (ESRF), requiring dialysis or transplantation.
(a) Dialysis
There are two types of dialysis: hemodialysis and peritoneal dialysis (PD). In each case, the patients blood is separated from the dialysis fluid (dialysate) by a membrane which allows water and toxins, but not blood cells, to pass out of the blood. In PD, the peritoneal membrane acts as the filter, whereas, in hemodialysis, the membrane is within the dialysis machine. Individuals commonly commence with PD and may progress to hemodialysis if renal function deteriorates further.
Most affected patients receive hemodialysis for up to 4 hrs, 2 or 3 times each week (Ansell and Feest, 2002). Arteriovenous fistulae in the arm are required for regular vascular access via wide-bore needles. The fistula is usually fashioned from a native vein; however, it is sometimes necessary to use animal or synthetic grafts if the local anatomy is unsuitable (Werner and Saad, 1999). Hemodialysis increases the risk of viral transmission (such as HIV and hepatitis B and C; Pol, 1995) and is costly.
In comparison of the cost-effectiveness of hemodialysis and PD, one finds that the latter has less initial cost, but the long-term cost of the two techniques is similar. Although the two techniques are equally effective and appropriate for most patients, it is common, at least in the UK, to begin with PD, since the veins will be available should the technique fail and hemodialysis become necessary (Stein and Wild, 2002).
For PD to take place, a catheter is placed into the peritoneum through which the dialysis fluid is exchanged. Continuous ambulatory peritoneal dialysis (CAPD) requires 4 exchanges of approximately 2 liters throughout the day. An alternative method is automated peritoneal dialysis (APD), in which the dialysis fluid exchanges are carried out automatically by machine, during the hours of sleep (for 810 hrs).
(b) Renal Transplantation
Renal allografts may be cadaveric or from living donors, either related or non-related (although those from living relatives give rise to the best prognosis). Cadaveric organs are allocated on the basis of HLA tissue-typing, ABO compatibility, and the age and size of the donor and recipient.
In the UK, during 2001, 1743 (29.6 per million population) kidney transplant operations were perfomed (http://www.uktransplant.org.uk/statistics/transplant_activity/, http://www.statistics.gov.uk/census2001/pop2001/united_kingdom.asp). These consisted of 1385 cadaveric and 358 living donor renal transplants. The majority (263) of the living donors were relatives. The one-year success rate is presently 86% for cadaveric- and 95% for living-donor-transplanted kidneys (www.uktransplant.org.uk/). The principal cause of allograft failure is rejection, although adverse drug side-effects may also be a contributing factor.
Immunosuppressant therapy is required to minimize the risk of allograft rejection. Commonly used agents are prednisolone, azathioprine, cyclosporin, and, more recently, tacrolimus. Cyclosporin has been associated with potentially serious side-effects, including nephrotoxicity (Grinyo and Cruzado, 2004), hepatotoxicity, neurotoxicity, hypertrichosis, and diabetes mellitus (Ota and Bradley, 1983; Svirsky and Saravia, 1989; Pirsch et al., 1997; Al-Zayer et al., 2001). Tacrolimus has adverse side-effects similar to those of cyclosporin, such as nephrotoxicity and neurotoxicity (Mihatsch et al., 1998); however, diabetes is a more frequent complication (Zuckermann et al., 2003) and occurs in up to 37% of patients receiving tacrolimus (McDonald and Russ, 2002). Hypertension and cytomegalovirus infection are less common with tacrolimus than with cyclosporin therapy. In addition to immunosuppressants, recipients of renal allografts require an array of medications, some of which can give rise to oral side-effects (see below).
| (VI) ORAL MANIFESTATIONS OF CHRONIC RENAL FAILURE AND RELATED THERAPIES |
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(i) Cyclosporin-induced Gingival Enlargement
The prevalence of gingival enlargement in individuals taking cyclosporin is unclear, and reportedly has a wide rangefrom 6 to 85% (Seymour et al., 1987; Slavin and Taylor, 1987; Pan et al., 1992; Pernu et al., 1992; King et al., 1993; Thomason et al., 1993; Allman et al., 1994; Somacarrera et al., 1994). It can be evident within 3 mos of the initiation of cyclosporin therapy (Savage et al., 1987; Thomason et al., 1996). Children and adolescents may be more prone to this drug-induced gingival enlargement than adults. If oral hygiene is poor, older individuals are also prone to gingival enlargement (Seymour and Smith, 1991).
Improvement in oral hygiene and professional cleaning results in a reduction in cyclosporin-associated gingival enlargement (Thomason et al., 1993, 1996; Somacarrera et al., 1994; Fu et al., 1997). However, this may be due to reduction in plaque-related inflammation rather than any drug-associated gingival enlargement (Seymour and Smith, 1991). There are conflicting reports on the association between gingival enlargement and cyclosporin dose (Porter and Scully, 1994), but the extent of the gingival enlargement does not seem to be related to the function of the allograft (Thomas et al., 2001).
Regular clinical monitoring of cyclosporin-related gingival enlargement is essential, since squamous cell carcinoma (Varga and Tyldesley, 1991) and Kaposis sarcoma have been reported within such gingival lesions (Qunibi et al., 1988; Farge, 1993).
(ii) Calcium Channel-blocker-induced Gingival Enlargement
Calcium channel blockers are prescribed to renal allograft recipients to reduce hypertension and cyclosporin-induced nephrotoxicity (Morales et al., 1994). There are many reports of nifedipine, amlodipine (Seymour et al., 1994; Ellis et al., 1999), diltiazem (Colvard et al., 1986; Giustiniani et al., 1987; Bowman et al., 1988; King et al., 1993), verapamil (Cucchi et al., 1985; Pernu et al., 1989), oxidipine, felodipine, and nitrendipine (Hassell and Hefti, 1991; Rees and Levine, 1995) causing this gingival enlargement. The reported prevalence of nifedipine-induced gingival enlargement is variable and occurs in 1083% of treated patients (Seymour et al., 1987; Barclay et al., 1992; Ellis et al., 1999). There are no data on the frequency of gingival enlargement with the other calcium channel blockers.
The presence of dental plaque may predispose to nifedipine-induced gingival enlargement (Nishikawa et al., 1991), but is not essential to its development (Morisaki et al., 1993). The dose or duration of treatment is not related to the prevalence of gingival enlargement (Barclay et al., 1992; Ellis et al., 1993). Some studies have reported a reduction in gingival enlargement following a change to an alternative calcium channel blocker (Lederman et al., 1984; Cebeci et al., 1996), but these drugs can still cause some gingival enlargement (Westbrook et al., 1997).
(iii) Combined Cyclosporin and Calcium Channel-blocker Therapy
There may be an increased incidence (Thomason et al., 1995, 1996; Margiotta et al., 1996; McKaig et al., 2002) and severity (King et al., 1993, 1994; Thomason et al., 1993, 1995, 1996; OValle et al., 1995; Margiotta et al., 1996; McKaig et al., 2002) of gingival enlargement when cyclosporin and nifedipine are prescribed together. In contrast, the combination of verapamil with cyclosporin does not seem to increase the frequency or severity of drug-induced gingival enlargement significantly (Cebeci et al., 1996).
(iv) Tacrolimus
Tacrolimus has been reported both to cause (Adams and Famili, 1991; Spencer et al., 1997) and to lessen (Asante-Korang et al., 1996; Cox and Freese, 1996) gingival enlargement, although, in a recent study of children with renal allografts, while 41% of those receiving cyclosporin had gingival enlargement, the majority of those receiving tacrolimus did not have this problem (Sheehy et al., 2000). Cyclosporin-associated gingival enlargement may reduce or resolve when cyclosporin is replaced by tacrolimus (Dodd, 1997; Bader et al., 1998; Busque et al., 1998; Hernandez et al., 1998, 2000; James et al., 2000; Kennedy and Linden, 2000).
(v) Other Gingival Changes
The gingivae in individuals with CRF can be pale due to anemia (Lohr and Schwab, 1991; London and Drueke, 1997), with possible loss of the demarcation of the mucogingival junction (Buckley et al., 1986), and when there is platelet dysfunction, the gingivae may bleed easily (Opatry, 1997).
(b) Oral Hygiene and Periodontal Disease
The oral hygiene of individuals receiving hemodialysis can be poor. For example, only 15% of 45 individuals receiving hemodialysis from 4 centers in Virginia, USA, had a good standard of oral hygiene (Naugle et al., 1998). Deposits of calculus may be increased (Epstein et al., 1980; Jaffe et al., 1986; Gavalda et al., 1999).
There is no good evidence of an increased risk of periodontitis (Brown et al., 1989; Thorstensson et al., 1996; Naugle et al., 1998), although premature tooth loss has been reported (Locsey et al., 1986). Localized suppurative osteomyelitis, secondary to periodontitis, was observed in one individual receiving hemodialysis (Tomaselli et al., 1993).
(c) Xerostomia
Symptoms of xerostomia can arise in many individuals receiving hemodialysis (Eigner et al., 1986; Gavalda et al., 1999; Kho et al., 1999; Kao et al., 2000; Klassen and Krasko, 2002). Possible causes include restricted fluid intake, side-effects of drug therapy, and/or mouth-breathing. Long-term xerostomia may predispose to caries and gingival inflammation and can give rise to difficulties with speech, denture retention, mastication, dysphagia, sore mouth, and loss of taste (Porter et al., 2004).
It also predisposes to caries and infections such as candidosis and acute suppurative sialadenitis (Porter et al., 2004).
(d) Oral Malodor/Bad Taste
Uremic patients may have an ammonia-like oral odor (Eigner et al., 1986; Kho et al., 1999), which also occurs in about one-third of individuals receiving hemodialysis (Kho et al., 1999). Chronic renal failure can give rise to altered taste sensation, and some patients complain of an unpleasant and/or metallic taste (Levy, 1988), or a sensation of an enlarged tongue (Levy, 1988; Ray, 1989; Kho et al., 1999).
(e) Mucosal Lesions
A wide range of oral mucosal lesions, particularly white patches and/or ulceration, has been described in individuals receiving dialysis and allografts (Table 4
). In particular, lichen-planus-like disease (sometimes termed lichenoid disease) can arise, sometimes, but not always, as a consequence of the associated drug therapy (e.g., diuretics, beta-blockers) (Chau et al., 1984; Hogan et al., 1985; Markitziu et al., 1986; Torrelo et al., 1990). Similarly, oral hairy leukoplakia can occur secondary to drug-related immunosuppression (Greenspan and Greenspan, 1989; King et al., 1993, 1994), although clinically and histopathologically similar lesions lacking Epstein-Barr virus (EBV) have been observed with uremia (McCreary et al., 1997). Of note, this latter lesion may resolve with correction of the uremia.
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In some instances, the mucosal surface may become erythematous or ulcerate (King et al., 1994; Kho et al., 1999; Klassen and Krasko, 2002). Oral mucosal macules and nodules have also been described in 14% of individuals receiving hemodialysis (Klassen and Krasko, 2002). Other lesions that can occur intra-orally in allograft recipients are listed in Table 4
(King et al., 1994).
(f) Oral Malignancy
The risk of oral squamous cell carcinoma in patients receiving hemodialysis is generally similar to that of otherwise healthy individuals in the general population (Lee and Gisser, 1978; Bradford et al., 1990), although there have been reports suggesting that therapy following renal transplantation predisposes to epithelial dysplasia and carcinoma of the lip (Regev et al., 1992; Thomas et al., 1993). Perhaps unsurprisingly, Kaposis sarcoma (KS) can occur in the mouths of immunosuppressed renal transplant recipients (Farge, 1993). There have been reports of squamous cell carcinoma (Varga and Tyldesley, 1991) and KS (Qunibi et al., 1988) arising within areas of cyclosporin-induced gingival enlargement. Any increased risk of oral malignancy in CRF probably reflects the effects of iatrogenic immunosuppression, which increases liability to virally associated tumors, such as Kaposis sarcoma or non-Hodgkins lymphoma. The inconsistent association between oral epithelial dysplasia and oral squamous cell carcinoma is in accord with the low risk of such disease in individuals with other, more significant, immunosuppressed statesfor example, HIV disease.
(g) Oral Infections
(i) Candidosis
Angular cheilitis has been described in up to 4% of hemodialysis and renal allograft recipients (King et al., 1994; Klassen and Krasko, 2002). Other oral candidal lesionssuch as pseudomembranous (1.9%), erythematous (3.8%), and chronic atrophic candidosis (3.8%)have been reported in allograft recipients (King et al., 1994). These figures may underestimate the increased susceptibility of immunosuppressed allograft recipients to fungal infection, since systemic anti-fungal agents are commonly prescribed prophylactically (Quirk et al., 1995).
(ii) Viral Infection
Prior to the availability of appropriate anti-viral drugs (e.g., acyclovir, gancyclovir, and valacyclovir), about 50% of renal allograft recipients, who were seropositive for herpes simplex, experienced recurrent, severe, and prolonged HSV infections (Korsager et al., 1975; Armstrong et al., 1976; Naraqi et al., 1977). However, in recent years, the use of effective anti-herpetic regimes has significantly reduced the frequency of such infection (Kletzmayr et al., 2000; Ljungman, 2001; McGavin and Goa, 2001; Squifflet and Legendre, 2002). Long-standing post-allograft immunosuppression may predispose subjects to human herpesvirus 8 (HHV-8) and associated Kaposis sarcoma (Leao et al., 2000).
(h) Dental Anomalies
Delayed eruption of permanent teeth has been reported in children with CRF (Woodhead et al., 1982; Koppang et al., 1984; Sampson and Meister, 1984; Wolff et al., 1985; Carl, 1987; Levy, 1988; Jaffe et al., 1990). Enamel hypoplasia of the primary and permanent teeth (Wolff et al., 1985; Kho et al., 1999; Koch et al., 1999; Al Nowaiser et al., 2003), with or without brown discoloration (Bottomley et al., 1972; Woodhead et al., 1982; Wolff et al., 1985; Eigner et al., 1986; Carl, 1987; Levy, 1988), can also occur.
Narrowing or calcification of the pulp chamber of teeth of adults with chronic renal disease can occur (Kelly et al., 1980; Spolnik et al., 1981; Wysocki et al., 1983; Nasstrom et al., 1985, 1993; Galili et al., 1991; Nasstrom, 1996; Ganibegovic, 2000). The exact cause of this dental change is not known. Renal allograft recipients have significantly more narrowing of the pulp chamber than those receiving hemodialysis (Nasstrom et al., 1985). There is no consistent association between corticosteroid therapy and narrowing of the pulp chamber (Galili et al., 1991).
Increased (Locsey et al., 1986) and decreased rates of dental caries (Woodhead et al., 1982; Sampson and Meister, 1984; Wolff et al., 1985; Jaffe et al., 1986; Levy, 1988; Klassen and Krasko, 2002; Al Nowaiser et al., 2003) have been observed in groups of patients with CRF. However, there is no evidence of a significantly increased risk of caries in patients with CRF. Although patients may have xerostomia, there would seem to be no increased risk of cervical caries, as might be expected (Porter et al., 2004).
Non-carious tooth tissue loss is more prevalent in individuals with CRF than in the general population (Levy, 1988). This may be due to nausea (Levy, 1988), esophageal regurgitation, or induced vomiting in bulimia nervosa (if a patient finds the restricted diet unpleasant) (Levy, 1988; Klassen and Krasko, 2002).
(i) Bone Lesions
A wide range of bony anomalies can arise in chronic renal disease. These reflect a variety of defects of calcium metabolism, including: loss of hydroxylation of 1-hydroxycholecalciferol to active vitamin D (1,25-dihydroxycholecalciferol); decreased hydrogen ion excretion (and resultant acidosis); hyperphosphatemia; hypocalcemia and resultant secondary hyperparathyroidism; and finally, interference in phosphate biochemistry by dialysis (Nadimi et al., 1993).
Secondary hyperparathyroidism affects up to 92% of patients receiving hemodialysis (Massry and Ritz, 1978). Hyperparathyroidism may present as a maxillary brown tumor (Okada et al., 2000), enlargement of the skeletal bases (Nadimi et al., 1993; Phelps et al., 1994; Michiwaki et al., 1996; Damm et al., 1997; Vigneswaran, 2001), or tooth mobility (Carmichael et al., 1995).
Orofacial features of renal osteodystrophy due to hyperparathyroidism are listed in Tables 5
and 6
(Sampson and Meister, 1984; Locsey et al., 1986; Carl, 1987; Levy, 1988; Molpus et al., 1991; Nadimi et al., 1993; Michiwaki et al., 1996; Damm et al., 1997; Ganibegovic, 2000; Okada et al., 2000; Klassen and Krasko, 2002).
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| (VII) DENTAL MANAGEMENT OF PATIENTS WITH CHRONIC RENAL FAILURE |
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It has been recommended that patients requiring a renal transplant have a detailed oral assessment and treatment prior to surgery (Kirkpatrick and Morton, 1971; Sowell, 1982; Eigner et al., 1986; Naylor and Fredericks, 1996; Ferguson and Whyman, 1998), perhaps highlighting a need for appropriately trained oral health professionals to collaborate with renal physicians. The dental examination should be timed appropriately to allow any necessary dental treatment to be carried out in a planned manner (Klassen and Krasko, 2002). Most transplant centers worldwide have a dental check in their pre-transplant protocol (Yamalik et al., 1993). However, Klassen and Krasko (2002) found that pre-transplant oral care was not meticulous. There is no evidence that poor oral hygiene or consequent dental disease significantly affects the morbidity or mortality associated with CRD. Nevertheless, there have been very occasional reports of the severe local and systemic spread of odontogenic infection in renal transplant recipients (Reyna et al., 1982; Wilson et al., 1982).
There may be a bleeding tendency in hemodialysis recipients, due to anti-coagulants or platelet dysfunction, but its effects can be minimized if dental treatment is carried out on the day following dialysis (Stewart, 1967; Dobkin et al., 1978; Precious et al., 1981; Sowell, 1982; Mannucci et al., 1983; Buckley et al., 1986; Eschbach and Adamson, 1989; Jameson and Wiegmann, 1990; De Rossi and Glick, 1996; Naylor and Fredericks, 1996). This is a practical solution, since the patients will still be in the hospital.
To minimize the risk of adrenal crisis in individuals who have taken large doses of corticosteroid (10 mg prednisolone daily or equivalent during the preceding 3 mos) and undergoing major surgical procedures (such as extraction of more than one tooth), appropriate corticosteroid cover should be administered (Seymour et al., 1994). In the past, large doses were used (up to 200 mg hydrocortisone), but more recent guidelines have recommended lower physiological doses (25 mg intravenous hydrocortisone pre-operatively) (Nicholson et al., 1998).
Impaired renal function can result in high blood levels of drugs or their metabolites (Perneger et al., 1994); thus, it may be necessary to reduce the dosage of many drugs or use alternative agents (Bennett et al., 1983). Potential medication complications are listed in Table 7
(British National Formulary, 2002).
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The ideal management of drug-induced gingival enlargement is to substitute another drug (Khocht and Schneider, 1997), but this may not always be possible. Meticulous oral hygiene (Daley et al., 1986; Hassell and Hefti, 1991; Nishikawa et al., 1991; Seymour and Smith, 1991; Hancock and Swan, 1992; Somacarrera et al., 1996, 1997; Hall, 1997; Westbrook et al., 1997; Bader et al., 1998; Oettinger-Barak et al., 2000) can lessen any plaque-related gingival disease, but there may still be some drug-associated gingival enlargement. Single case reports have advocated the use of antimicrobial agents (Nash and Zaltzman, 1998; Wirnsberger et al., 1998) such as metronidazole (Wong et al., 1994) to lessen the gingival enlargement, but metronidazole may also increase the cyclosporin concentration and the potential for nephrotoxicity (Seymour et al., 1997). Scalpel or laser excision of the gingival enlargement is necessary if the excess gingival tissue is unsightly and/or interferes with mastication, speech, or oral care (Khocht and Schneider, 1997). Recurrence is common, especially when the oral hygiene is inadequate (Seymour et al., 1994; Hall, 1997), highlighting the need for long-term effective plaque control and consideration of additional anti-plaque measures such as topical chlorhexidine gluconate or triclosan preparations.
| CONCLUSION |
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Received March 16, 2004; Accepted August 1, 2004
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