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1 Units of Conservative Dentistry and Oral Medicine, Eastman Dental Institute for Oral Health Care Sciences, University College London, 256 Grays Inn Road, London WC1X 8LD, UK; and
2 Valencia University and Hospital General Universitario de Valencia, Avenida 3 Cruces, 46014 Valencia, Spain;
* corresponding author, ctredwin{at}eastman.ucl.ac.uk
| ABSTRACT |
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KEY WORDS: oral drugs adverse reactions teeth
| INTRODUCTION |
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Drugs that affect other oral tissues have been discussed previously (Scully and Bagan, 2004).
| (1) DRUG-RELATED TOOTH DISCOLORATION |
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(a) Drug-related Extrinsic Tooth Discoloration
Extrinsic discoloration occurs after the tooth has erupted into the mouth. The drug subsequently causes superficial discoloration (Fig. 1
) which can be removed by toothbrushing or professional cleaning. There have even been attempts to increase superficial discoloration to test the efficacy of dentifrices (Pontefract et al., 2004).
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(b) Drug-related Intrinsic Tooth Discoloration
Intrinsic tooth discoloration is permanent and occurs when the drug interferes with odontogenesis.
(i) Fluorides
Inorganic fluorides have long been recognized for their potential to reduce the magnitude and severity of dental decay in children as well as adults (McClure, 1970; Klein, 1972). Although fluoride has substantial benefits in the prevention of tooth decay, depending on the level and source of exposure, fluorides also have adverse effects on human tissues (Hiller et al., 1998).
Discoloration or damage to tooth structure may occur when the total daily intake of the fluoride ion from sources such as water, toothpaste, prescribed drops, and tablets is high while the enamel is undergoing pre-eruptive formation and maturation. The most common adverse effect of excess exposure to fluoride is dental fluorosis, a permanent hypomineralization of enamel, characterized in its mildest form as small, barely visible, white flecks found primarily on cusp tips and on facial surfaces of the permanent dentition (DenBesten, 1999). The moderate to severe forms are found on most permanent tooth surfaces and range between white opaque areas to darkly stained and pitted enamel (DenBesten, 1999) (see Fig. 2
).
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(ii) Tetracyclines
In the early 1960s, clinical evidence began to appear suggesting that tetracycline could cause tooth discoloration (Olsen and Riley, 1966). This association was subsequently substantiated by several clinical and laboratory studies demonstrating that tetracycline becomes irreversibly bound to calcified tooth structures if it is administered during the calcification stage of tooth development (Guggenheimer, 1984). Tetracyclines are now well-recognized to result in the discoloration of tooth enamel when prescribed during tooth development.
Females exposed to tetracycline during the second or third trimester of pregnancy may give birth to a child who will have discolored teeth. The teeth may become bright yellow upon development, and the stains will eventually turn to grey or brown over time (Driscoll et al., 1993) (Fig. 3
).
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Depending on the specific tetracycline used, the type and severity of discoloration may vary (Driscoll et al., 1993). Tetracycline and oxytetracycline cause a yellow discoloration, whereas chlortetracycline produces a grey-brown discoloration (Driscoll et al., 1993). Evidence suggests that, of all the tetracyclines, oxytetracycline causes the least tooth discoloration (Wallman and Hilton, 1962). Tetracyclines (e.g., Ledermixtriamcinolone acetonide and demethylchlortetracycline) used within the tooth for endodontic therapy may also cause dark grey-brown discoloration (Kim et al., 2000). However, other anti-microbials, such as minocycline and ciprofloxacin, have also been reported to cause tooth discoloration (see Table 2
).
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The exact mechanism by which minocycline causes tooth discoloration is controversial and still under investigation. Currently, there are four possible theories: first, the extrinsic theory (Berger et al., 1989), where it is thought that minocycline attaches to the glycoproteins in acquired pellicles. This in turn etches the enamel, and demineralization/remineralization cycles occur. It oxidizes on exposure to air or as a result of bacterial activity, and so causes degradation of the aromatic ring, forming insoluble black quinone. The second is the intrinsic theory (Bowles and Bokmeyer, 1997; Bowles, 1998), where the minocycline bound to plasma proteins is deposited in collagen-rich tissues, such as teeth. This complex oxidizes slowly over time with exposure to light. This deposition in teeth occurs solely within the dentin matrix as secondary and reparative dentin is formed; the drug or its metabolic congeners do not affect enamel itself. The third possibility is that hemosiderin, a breakdown product of iron, chelates with minocycline to form an insoluble complex (Poliak et al., 1985; Rosen and Hoffman, 1989). The fourth suggestion is that minocycline could be deposited in dentin during dentinogenesis (Good and Hussey, 2003).
(iv) Ciprofloxacin
Ciprofloxacina quinolone given intravenously to infants at dosages of 10 to 40 mg/kg/day to treat infections with Klebsiellahas been associated with greenish discoloration of the teeth when they erupted, and the discoloration could not be removed (Lumbiganon et al., 1991).
| (2) DRUG-RELATED PHYSICAL DAMAGE TO TOOTH STRUCTURE |
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(b) Tooth Erosion
Tooth erosion may be caused by carbonated drinks and acidic fruits and their juices (Zero, 1996) and is commonly seen in individuals who use acidic "high energy" drinks during sports (Mathew et al., 2002) and in wine tasters (Mok et al., 2001).
Any drug that has the potential to cause gastro-esophageal reflux disease (GERD) can result in gastric acid reaching the oral cavity and a subsequent increased risk for tooth erosion. Examples of such drugs are listed in Table 4
(Bartlett and Smith, 1998).
Drugs such as aspirin (McCracken and ONeal, 2000), and even some mouthwashes, may also cause erosion (Pontefract et al., 2001; Pretty et al., 2003).
Powdered versions of anti-asthmatic drugssuch as beclomethasone diproprionate, fluticasone, salmeterol, and terbutaline sulphate powdershave a pH lower than 5.5 and are more acidic than aerosol versions. Asthmatics who take such drugs in a powdered, rather than an aerosol, form are also at risk for tooth erosion (OSullivan and Curzon, 1998). This may be associated with increased GERD. Those taking these medicaments should thus rinse their mouths with water directly after taking the drugs and also be encouraged to clean their teeth thoroughly, at least twice a day, with a fluoride toothpaste.
(c) Drugs That Result in Decreased Salivary Secretion
Any drug that leads to decreased salivary secretion (dry mouth/xerostomia) can result in damage to teeth. As a result of decreased salivary secretion, the protective functions of saliva will be compromised, and this increases the susceptibility of the teeth to diseases such as dental caries. Dry mouth has a variety of possible drug causes (Scully, 2003; Scully and Bagan, 2004). The drugs that can result in dry mouth are illustrated in Table 5
.
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(e) Anticonvulsants
There have been several reports of the effects on dental development of pre- and post-natal administration of anticonvulsants (Robinson et al., 1983; Orup et al., 1998).
Pre-natal exposure to anticonvulsants has been shown to cause craniofacial dysmorphology, pre-natal growth retardation, hypoplastic nails and phalanges, and visceral abnormalities, as well as a significant increase in mesiodistal crown dimensions of the posterior maxillary teethspecifically, primary molars and their permanent premolar successors, as well as permanent molars. Changes in tooth size were more common in females than in males. Dental maturity, assessed with the use of panoramic radiographs, was equal to chronological age. An increased frequency of hypodontia was the only clinically notable dental anomaly (Orup et al., 1998), but root formation can be disturbed (Robinson et al., 1983)an effect demonstrable in animal models (Robinson et al., 1978).
(f) Chemotherapeutic Drugs
Studies on drugs used for the treatment of childhood cancer and leukemia have consistently shown that children younger than 5 years at diagnosis and the start of treatment exhibit abnormal dental development (Dahllöf et al., 1994). The severity of dentofacial-developmental and tooth-related abnormalities secondary to the therapy are related to the age of the child, the dosage, and the duration of treatment (Dahllöf et al., 1994). Dental abnormalities include tooth agenesis, arrested tooth development, microdontia, and disturbances affecting enamel, dentin, and cementum (Jaffe et al., 1984; Durr et al., 1987; Rosenberg et al., 1987; Pajari et al., 1988; Nunn et al., 1991; Kaste et al., 1997; Alpaslan et al., 1999).
| (3) DRUG-RELATED ALTERATION TO TOOTH SENSITIVITY |
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This review article has illustrated that many drugs can have an adverse effect on teeth. It is important that any individual involved with the prescription of these drugs comprehensively understand any potential side-effects that they may have and that, with this knowledge, the individual prescribes them having carefully considered the benefits vs. adverse effects that may occur as a result.
Received August 17, 2004; Accepted February 10, 2005
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