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J Am Dent Assoc, Vol 137, No 11, 1539-1546.
© 2006 American Dental Association | ![]() |
RESEARCH |
| ABSTRACT |
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Methods. The authors tested 218 subjects (3 to 10 years old) and 195 care-givers at four pediatric dentistry clinics in Taipei, Taiwan.
Results. Forty-four percent of the children had at least one plaque sample that tested positive and/or weakly positive. Positive results were more frequent in the mixed dentition, as well as in children with gingivitis (P < .001). A logistic regression model showed that if the BANA test results for the care-giver were positive, the odds of the childs also having positive test results were 55 times greater (P < .001; confidence interval [CI] = 14 to 224) than those for a child whose caregiver had negative BANA test results. Other predictors were the presence of a mixed dentition (P < .001; odds ratio [OR] = 11; CI = 3.5 to 33.5) and the childrens papillary bleeding scores (P < .001, OR = 3.1, CI = 2.0 to 4.7).
Conclusion. The BANA test results were positive for almost one-half of the children. A positive reaction was associated with gingivitis, a mixed dentition, a BANA-positive caregiver or a caregiver with a history of periodontal disease in the family.
Clinical Implications. The authors propose an anaerobic periodontal infection risk model in which children with a mixed dentition who have gingivitis and a caregiver with a history of periodontal disease would undergo the BANA test.
Key Words: Taiwanese children; BANA test; transmission; periodontal disease
Periodontal diseases often are neglected in childhood and adolescence.1 Although gingivitis is the most common form of periodontal disease, a localized aggressive form that causes bone loss around molars and incisors occurs in a small number of subjects, usually after puberty. This localized aggressive periodontitis is associated significantly with periodontal pathogens such as Porphyromonas gingivalis, Treponema denticola, Tannerella forsythia and Actinobacillus actinomycetemcomitans, which also are associated with adult periodontal disease.2,3 If the localized form is not treated properly, it may progress to a more aggressive periodontitis affecting many teeth. This finding is evidence that the bacterial species implicated in adult periodontal diseases actually colonizes the teeth in childhood.
An infants oral flora is acquired from his or her primary caregiver, almost always the mother. Li and colleagues8 and Tedjosasongko and Kozai9 showed this initially with Streptococcus mutans, and it has been extended to include several periodontal pathogens. Kononen and colleagues10 reported that various anaerobic species colonize the edentulous mouths of infants, and maternal saliva may act as a source of some gram-negative anaerobes.11 Alaluusua and colleagues12 demonstrated that if a child harbored a periodontal pathogen, such as A. actinomycetemcomitans, at least one of his or her parents exhibited the same bacterial genotype. Tuite-McDonnell and colleagues13 found a significant association between colonization of P. gingivalis in the infant and in either of the parents.
Watson and colleagues15 reported that children 2 to 18 years of age whose parents or other care-givers oral cavities were colonized by BANA-positive bacteria had 9.8 times greater odds of their oral cavities being colonized by these bacteria than did children whose parents or care-givers oral cavities were not colonized by BANA-positive bacteria. In addition, Lee and colleagues16 conducted a study involving patients in a dental clinic; they found that childrens odds of having oral cavities colonized by BANA-positive species were 55 times greater in those whose parents or caregivers oral cavities were colonized by BANA-positive species than in children whose parents or other caregivers had negative BANA test findings. In both studies, children whose parents or care-givers had a history of periodontal disease were significantly more likely to have dentitions that were colonized by the BANA-positive species than were children whose parents or caregivers did not report having a history of periodontal disease. Watson and colleagues15 conducted examinations in the parents and found that children whose mothers had clinical evidence of periodontitis had 12 times greater odds of having oral cavities colonized by BANA-positive species than did children whose mothers did not have periodontal disease.
These findings are compatible with the hypothesis that children acquire the BANA-positive species from their parents or other caregivers, especially if any of their caregivers has periodontitis. We obtained these data from convenience samples in southwestern Michigan. To generalize these findings, we sought to determine whether the study could be replicated in caregiver-child pairs residing in Taiwan.
Taiwan is an island with an ethnic Chinese population of approximately 22 million people. The drinking water in Taiwan is nonfluoridated. In 2000, Tsai and colleagues17 reported that 95 percent of children aged 7 years had active dental caries. Peng and colleagues18 surveyed adults in Taipai using the Community Periodontal Index of Treatment Needs, which showed an 87 percent prevalence of gingivitis and a 33 percent prevalence of periodontitis. No data were available regarding the prevalence of gingivitis or aggressive periodontitis in Taiwanese children or adolescents, but Yuan and colleagues19 found a 5.5 percent prevalence rate of A. actinomycetemcomitans, which increased after the eruption of first molars and peaked near puberty.
We conducted a study, therefore, to determine the prevalence of anaerobic periodontal pathogens, as measured by the BANA test, in young Taiwanese children, as well as the potential transmission of BANA-positive species from caregivers to children.
Experimental protocol.
All children and their caregivers who came to the pediatric clinics during the winter of 2003 were invited to participate in the study. The dentist explained the purpose and design of the study to the caregiver (usually the mother). He explained to the caregivers that participation in the study was strictly voluntary and their decision would not influence further treatment of their children at the clinic. In addition, he described the dental examination, BANA test procedure and possible discomfort, as well as the benefits of the test to the caregiver. If he or she agreed to allow his or her child to participate in the study, as well as himself or herself, the clinician obtained signed consent before the examination. He also obtained oral consent from the 6- to 10-year-old children before the test.
The dentist asked the caregiver for relevant data about the child and himself or herself (such as birth date, sex and age). He also asked him or her to complete a simple questionnaire, written in Chinese, that inquired about such things as the number of people in the household, the periodontal history of the caregivers and previous use of antibiotics by the child. The dentist was present to help caregivers if they had difficulty filling out the questionnaire.
The same clinician then examined the child and recorded the type of dentition (primary, mixed or permanent), decayed, missing and filled teeth (dmft [primary] or DMFT [permanent]) index, caries status (that is, caries free, small pit-and-fissure caries, moderate occlusal caries, proximal caries or rampant caries) and the patients level of oral hygiene. The dentist also determined the plaque index (PI) at the interproximal site to be sampled for the BANA test.
The dentist collected interproximal/subgingival plaque samples for the BANA test. He used a plaque remover (STIM-U-DENT Plaque Removers, Johnson & Johnson, New Brunswick, N.J.) to obtain plaque samples from each quadrant. First, he removed any supragingival plaque from the site and inserted the plaque remover between the first and second molars in children with a primary dentition; between the second primary molar and first permanent molar in children with a mixed dentition; and between the second premolar and first permanent molar in children with a late mixed dentition or a permanent dentition. If the child had any missing teeth, the dentist removed the plaque sample from the mesial or distal side of the remaining tooth. This procedure was repeated for caregivers, except that the dentist sampled the site between the first molar and second premolar.
Papillary bleeding score (PBS).
The PBS can indicate gingival inflammation and can be calculated at the same time that the plaque sample for the BANA test is obtained.16 After the dentist removed the plaque remover from the subjects mouth, he or she recorded any bleeding in the interproximal area on a 0-to-5 scale (0 = no bleeding, tissue healthy; 1 = no bleeding, tissue not healthy; 2 = spotting of blood; 3 = bleeding that flows into the triangular fossa; 4 = bleeding to other teeth; 5 = spontaneous bleeding).16
BANA test.
After removing the plaque remover from the interproximal site, the dentist wiped it onto the lower portion of the strip of the BANA test card to transfer any adherent plaque. He used a separate plaque remover for each plaque sample, so four distinct samples were obtained for each subject, for a total of five possible BANA outcomes (Table 1
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PERIODONTAL DISEASE
TOP
ABSTRACT
PERIODONTAL DISEASE
N-BENZOYL-DL-ARGININE-2...
SUBJECTS, MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES
These early forms of periodontal disease may have serious medical consequences later in life. Women with the type of periodontal disease that is associated often with P. gin-givalis, T. denticola and T. forsythia in subgingival plaque are at an increased risk of delivering low-birth-weight premature infants.46 Recently, Gatz and colleagues7 showed that tooth loss in people younger than 35 years is an independent risk factor for the development of Alzheimers disease in people 65 years and older. These medical conditions point to the need to detect the presence of these periodontal pathogens in children and treat them accordingly.
![]()
N-BENZOYL-DL-ARGININE-2-NAPHTHYLAMIDE
TOP
ABSTRACT
PERIODONTAL DISEASE
N-BENZOYL-DL-ARGININE-2...
SUBJECTS, MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES
T. denticola, P. gingivalis and T. forsythia possess a trypsin-like enzyme that hydrolyzes the synthetic substrate N-benzoyl-DL-arginine-2-naphthylamide (BANA). Clinicians can detect this enzyme within five to 10 minutes at chairside using the BANA test (BANAMet LLC, Ann Arbor, Mich.; distributed by OraTec, Manassas, Va.).14
![]()
SUBJECTS, MATERIALS AND METHODS
TOP
ABSTRACT
PERIODONTAL DISEASE
N-BENZOYL-DL-ARGININE-2...
SUBJECTS, MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES
Subjects.
One of us (Y.L.) saw 218 subjects (aged 3 to 10 years) in the Pediatric Dentistry Clinic at the Taipei Medical University Hospital (n = 82), Pediatric Dentistry Clinic at the Chang Chung Memorial Childrens Hospital (n = 62), Bo-Lin Pediatric Dentistry Clinic (n = 42) and Der-Wei Pediatric Dentistry Clinic (n = 32), all in Taipei. There were 116 boys and 102 girls, all of whom had posterior teeth, were in good general health and were cooperative with dental treatment. All parents (n = 195) (some had two or more children in the study) agreed to undergo the BANA test. The Medical Health Ethics Committee of Taipei Medical University Hospital, Dental Department, reviewed and approved all procedures included in this research.
). After the dentist sampled all tooth sites, he used a cotton swab to lightly moisten the upper portion of the strip with distilled water. He then folded the BANA test card in half.
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Statistical analysis.
We used statistical software (SPSS 10.1 for Windows, SPSS, Chicago) for statistical analysis. We generated frequency tables for each categorical variable and obtained descriptive statistics for continuous variables. We performed
2 tests to assess the significance of the relationship of the BANA test results to each of the categorical variables. In addition, we performed independent-samples t tests to determine if there was a difference in the means of continuous variables for BANA-positive and BANA-negative patients. We used a stepwise logistic regression analysis to determine the association between the various independent variables and the BANA-positive status of the child.
| RESULTS |
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The results of the BANA test were negative for 110 children (50.5 percent) for the plaque samples taken from the four quadrants. The results of the test were positive or weakly positive for 108 children (49.5 percent). Children with more BANA-positive samples tended to be older than children with BANA-negative plaque samples (Table 1
).
The number of BANA-positive samples was not related to sex, PI, caries status, the history of dental visits, brushing habits or the antibiotic history of the subject (P > .05). New patients in the clinic were more likely to have negative BANA test results, because they tended to be younger and to have a primary dentition. Children with a mixed dentition had significantly more BANA-positive samples than did children with a primary dentition (P < .001) (Table 2
). BANA-positive children were significantly older than were BANA-negative children. Thirty-five percent of the children aged 3 to 5 years had BANA-positive samples, compared with 63 percent of the children aged 6 to 10 years (P < .001) (Table 2
). We found a tendency for the dmft index, but not the DMFT index, to be lower in BANA-positive children. However, the difference was not significant (P > .05). In addition, the BANA-positive children had significantly higher PBS scores (Table 3
).
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2 test). In the 3- to 5-year-old age group, 36 (56 percent) of the children of BANA-positive caregivers had positive BANA test results, while only two (5 percent) of the children of BANA-negative care-givers had positive BANA test results (P < .001). This pattern was more pronounced in the 6- to 10-year-old age group; 69 (93 percent) of the children of BANA-positive caregivers had positive BANA test results compared with only one (3 percent) of the children of BANA-negative caregivers (P < .001).
Seventy-four percent of the children whose care-givers reported that they or a family member had periodontal disease had BANA-positive plaque samples, whereas 34 percent of the children whose caregivers reported having no history of periodontal disease had BANA-positive plaque samples (
2 = 32.2, P < .001). Fifty-five percent of the children whose caregivers were 35 years or older had positive BANA test results. compared with 31 percent of the children whose caregivers were younger (
2 = 9.1, P = .003). We found no effect of the number of caregivers on the BANA status of the child.
We performed a series of logistic regression analyses to determine the association between various independent variables and the positive test results for the children in this study. Table 4
shows the results for each of these models, including the Nagelkerke R2, the odds ratio (OR) for each variable and the 95 percent confidence interval (CI).
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When we added the mean PBS of the child (model 2), the explained variability increased to 71 percent. In this model, the caregivers BANA status and PBS were about equally significant contributors to the childs BANA status. When we added the childs dentition status (primary versus mixed) (model 3), it also was significant, and the explained variability of the model increased to 77.4 percent. We should note that the ORs decreased for the BANA status of the caregiver as we included additional variables in the model, which reflects the colinearity among the various predictors. We emphasize the overall ability of the model to predict the BANA status of the child, rather than the importance of individual predictors.
The periodontal history of the family, when added to the model, was not significant, despite its importance in the bivariate analysis. This finding reflected our observation that the BANA-positive status of the caregiver and a history of periodontal disease in the family were so highly correlated that they could not behave as independent variables in the model (that is, 92 percent of the BANA-positive caregivers had a family history of periodontal disease). However, when we substituted a history of periodontal disease in the family for the BANA status of the caregiver (model 4), we estimated that a child with a family history of periodontal disease had 3.3 times greater odds of having a BANA-positive plaque sample than did a child without a family history of periodontal disease (Table 4
). The Nagelkerke R2 for this model (R2 = .64), although not as high as that for the model including the BANA status of the caregiver, was impressive.
Other predictor variables, such as the care-givers age, number of family members with a history of periodontal disease, occlusal development stage and treatment status, that were associated significantly with the childs BANA-positive results in the bivariate models (Tables 2
and 3
) were not significant when added to any of the logistic regression models.
| DISCUSSION |
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Although these studies were performed in convenience samples (with the exception of the Saipan study), the uniformity of the results in mother-child pairs from different ethnic backgrounds and locations and in studies that used different detection methods indicates that organisms associated with periodontal disease are acquired in early childhood from the caregiver, almost always the mother. Li and colleagues30 observed a similar pattern with regard to the transmission of mutans streptococci from mother to child.
Our study and those carried out in U.S. children16,21 showed that BANA-positive plaque samples were found more frequently in children aged 6 to 10 years with a mixed dentition compared with younger children with a primary dentition. A possible explanation is that with increasing age, there is more time for the oral cavity to be colonized by outside sources of bacteria. Another possible explanation is that the microenvironment at interproximal sites in the mixed dentition (such as bleeding during eruption) promotes colonization of BANA-positive species from sites such as the tongue31 and the primary dentition. In this regard, the BANA species have nutrient requirements for host molecules such as hemin, progesterone, ceruloplasmin and acetyl muramic acid.3234 The eruption of the permanent teeth increases the number of interproximal sites, which would provide a suitable environment for these anaerobic bacteria.
The BANA test has been used in epidemiologic studies of children,3538 but there have been no reports, to our knowledge, regarding its use in children in a clinical practice. Because the prevalence of periodontal disease (especially aggressive early-onset periodontitis) in children in the United States and elsewhere is low,39,40 there has been no perceived need to address the presence of periodontopathic species in children, such as there is for the presence of mutans streptococci. However, the three BANA-positive bacteria associated with aggressive periodontitis (P. gingivalis,41 T. denticola2,3 and T. forsythia 3,42) also are associated with adult forms of periodontal disease. This is of interest because reports have suggested that periodontal disease and tooth loss, especially in people younger than 35 years, may be associated with cardiovascular disease,43,44 preterm births of low-birth-weight infants4,6 and Alzheimers disease.7 It is possible that advanced forms of periodontal disease in people 35 years or younger reflect a childhood colonization by periodontopathic bacteria.
While these studies associating periodontal disease with serious medical conditions are preliminary, they suggest that researchers and clinicians should be somewhat concerned regarding the transmission of odontopathogenic bacterial species from the mother or caregiver to the child. Our finding that the mother or other caregiver is the main source of the childs BANA-positive plaque samples is of little practical value in this regard, because it is unlikely that the dentist would routinely determine the BANA status of the mother or caregiver. However, when we used the history of periodontal disease in the household as a surrogate for the BANA status of the caregiver, this history, in combination with the childs PBS and the presence of a mixed dentition, yielded a model that was highly predictive of the childs BANA status (Table 4
). The information for this model can be obtained easily at the childs first clinic visit.
Periodontal infection risk model. Accordingly, we can propose an anaerobic periodontal infection risk model from the results of our study. A likely scenario would be to administer the BANA test to children with a mixed dentition who have gingivitis and whose caregivers indicate having a history of periodontal disease. If the childs BANA test results are positive and he or she has gingivitis (as determined by a PBS greater than 2), the clinician can provide oral hygiene instructions and/or prescribe topical antimicrobials to suppress the BANA-positive flora. Periodontal risk assessment of this nature would focus on children whose oral cavities are colonized demonstrably by periodontopathic bacteria, thereby saving time and reducing expenditures.
Study limitations. Because these recommendations are based on results obtained from convenience samples, researchers need to sample a larger, randomly selected population for the results to be applicable to the general population. A long-term follow-up of the children who had positive BANA test results would be necessary to determine whether the risk indicators identified were effective in predicting which children were more likely to develop aggressive periodontitis. Longitudinal studies in adults have shown that the presence of P. gingivalis, T. forsythia and BANA-positive plaque samples were risk factors for periodontal disease.4547
The reduction in the OR when we substituted a history of periodontal disease for the BANA status of the caregiver (that is, 3.3 versus 55) (Table 4
) might reflect the caregivers inaccurate reporting of this history, or that bacteria other than the BANA-positive species are contributing to the periodontal disease in the household. These bacteria include Prevotella intermedia, Fusobacterium nucleatum, A. actinomycetemcomitans and Campylobacter rectus, as well as others.48
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We propose an anaerobic periodontal infection risk model in which children with a mixed dentition who have gingivitis and a caregiver with a history of periodontal disease undergo the BANA test. In this model, clinicians would recommend treatment for children whose BANA test results are positive.
| FOOTNOTES |
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| REFERENCES |
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