Perinatal HIV Infection and Exposure and Their Association With Dental Caries in Nigerian Children

Risk indicators for dental caries among preschoolers, school children/adolescents and adults in Nigeria: a scoping review

BACKGROUND

Identifying the dental caries risk factors helps plan interventions. This scoping review mapped the existing literature on dental caries risk indicators for children, adolescents, and adults in Nigeria. It elucidated the commonalities and differences in these populations' behavioral, biological, and social risk indicators, and identified the local government areas in Nigeria where information on dental caries risk indicators are missing.

METHODS

A search of the literature search was performed in July 2023 in PubMed, African Journal Online, Google Scholar, and Cochrane Library [CENTRAL] using a combination of keywords related to dental caries, risk factors, early childhood, children, adults, and Nigeria. Only peer-reviewed full-length articles on risk factors for dental caries in Nigeria published in English were included. Descriptive statistics were used to summarize the study's characteristics and risk indicators for dental caries. The risk indicators for dental caries were categorized into behavioral, biological, and social. Differences and commonalities of the identified behavioral, biological, and social risk indicators for the three populations were identified.

RESULTS

After screening 570 studies, 27 publications for preschoolers, 37 for school children/adolescents, and 17 for adults met the inclusion criteria. For all groups, key social risk indicators were age, gender, socioeconomic, and educational status, biological risk indicators were anthropometric measurements and bacterial counts, and behavioral risks indicators were toothbrushing, snacking, and oral hygiene. Peculiar behavioral, biological, and social risk indicators were identified for each age group. Most studies are clustered in southern Nigeria. In addition, studies in preschoolers was skew to southwestern Nigeria, that of children/adolescents were skewed to Ife Central LGA in Osun State, while that for adults were skewed to Egor LGA in Edo State. Furthermore, participants recruitment was most diverse in Lagos State.

CONCLUSIONS

The shared risk indicators for dental caries can facilitate the development of overarching caries prevention program for the difference age groups in Nigeria. while the age specific risk indicators can inform the development of population specific interventions. This scoping review underscores the importance of a holistic, life course approach to dental caries risk management.

Altered Surrogate Markers of Inflammation in Perinatal HIV-Exposed Children with Caries

OBJECTIVE

Dental caries is associated with immunologic response, yet its association with hematologic parameters and inflammatory markers is unclear. This study aimed to examine the relationship between some surrogate markers of inflammation and dental caries in the context of perinatal exposure to human immunodeficiency virus (HIV).

METHODS

This cross-sectional study involved 2 groups of children aged 4 to 11 y who were (1) HIV exposed but uninfected (HEU) and (2) HIV unexposed/uninfected (HUU) and recruited from HIV pediatric and child outpatient clinics, respectively, at a tertiary health facility in Nigeria. Medical records were reviewed, and trained dentists conducted oral and dental examinations. Five milliliters of EDTA blood was obtained and used for CD4 and CD8 and complete blood analysis, from which other inflammatory markers such as the neutrophil-lymphocyte ratio (NLR), platelet-lymphocyte ratio (PLR), systemic inflammatory index (SII), CD4/CD8 ratio were calculated using referenced formulas.

RESULTS

In total, 245 (125 HEU and 120 HUU) children with a mean (standard deviation) age of 7 (2) y were included in this study. No differences in caries experience were observed in both groups of children (38 children [16%] were caries affected; 19 [16%] and 19 [15%] from the HEU and HUU groups, respectively). Examining the relationship between studied inflammatory markers and caries showed that leucocyte counts were slightly lower in caries-affected children compared with their caries-free counterparts (P = 0.05). Lower levels of neutrophils (P = 0.04) and higher levels of lymphocytes (P = 0.02) were associated with caries prevalence. Although not significant, NLR, PLR, and SII were lower in caries-affected children.

CONCLUSION

Caries is associated with leucocytes and some of its subsets in both groups of children and independent of perinatal HIV exposure, highlighting the potential of evaluating inflammatory markers in caries prevention, treatment, and research.

KNOWLEDGE TRANSFER STATEMENT

This study provides evidence that a relationship exists between dental caries, HIV exposure, and inflammation using affordable methods and advocates the inclusion of these markers in caries care in resource-limited settings.

HIV Infection and Exposure Increases Cariogenic Taxa, Reduces Taxonomic Turnover, and Homogenizes Spatial Differentiation for the Supragingival Microbiome

Background

The oral microbiome comprises distinct microbial communities that colonize diverse ecological niches across the oral cavity, the composition of which are influenced by nutrient and substrate availability, host genetics, diet, behavior, age, and other diverse host and environmental factors. Unlike other densely populated human-associated microbial ecosystems (e.g., gut, urogenital), the oral microbiome is regularly and directly exposed to the external environment and is therefore likely less stable over time. Cross sectional studies of the oral microbiome capture a glimpse of this temporal dynamism, yet a full appreciation of the relative stability, robusticity, and spatial structure of the oral environment is necessary to understand the role of microbial communities in promoting health or disease.

Results

Here we investigate the spatial and temporal stability of the oral microbiome over three sampling time points in the context of HIV infection and exposure. Individual teeth were sampled from a cohort of 565 Nigerian children with varying levels of tooth decay severity (i.e., caries disease). We collected 1,960 supragingival plaque samples and characterized the oral microbiome using a metataxonomic approach targeting an approximately 478 bp region of the bacterial rpoC gene. We found that both infection and exposure to HIV have significant effects on the stability of the supragingival plaque microbiome at both the spatial and temporal scale. Specifically, we detect (1) significantly lower taxonomic turnover of the oral community among exposed and infected children compared to unexposed children, (2) we find that HIV infection homogenizes the oral community across the anterior and posterior dentition, and (3) that impaired immunity (i.e., low CD4 count) and low taxonomic turnover over time in children living with HIV is associated with higher frequency of cariogenic taxa including Streptococcus mutans.

Conclusions

Our results document substantial community fluctuations over time in children unexposed to HIV independent of oral health status. This suggests that the oral community, under typical conditions, rapidly adapts to environmental perturbations to maintain homeostasis and that long-term taxonomic rigidity is a signal of community dysfunction, potentially leading to a higher incidence of oral disease including caries.

Dental caries in HIV-infected children and adolescents: A systematic review with meta-analysis

This study aimed to evaluate and compare the risk of dental caries in between human immunodeficiency virus (HIV)-infected and uninfected children and adolescents. An electronic search was performed on PubMed/MEDLINE, Web-of-Science, Scopus, LILACS, ProQuest, and ClinicalTrials.gov up to May 2022. The critical appraisal checklist developed by the Joanna Briggs Institute was used to evaluate the quality of the included studies. Meta-analysis was performed using the RevMan 5.4. Sixteen studies were included. A total of 3231 participants were evaluated, including 1701 and 1530 HIV-infected and uninfected children and adolescents, respectively. The meta-analysis revealed a higher risk of dental caries for primary dentitions in HIV-infected children and adolescents by decayed, missing, filled tooth (dmft) (SMD:0.34; p = 0.006) and decayed, missing, filled surface (dmfs) scores (SMD:0.37; p = 0.001). Similar results were observed for permanent dentition, with increased dental caries in HIV-infected children and adolescents with DMFT (SMD:0.32; p = 0.003) and DMFS (SMD:1.78; p < 0.0001) scores. Regarding the quality assessment, most of the included studies were moderate or good quality. However, the certainty of the evidence of the outcomes was very low. This systematic review and meta-analysis showed higher caries severity in permanent and deciduous teeth among HIV-infected children and adolescents.

Impact of perinatal HIV exposure and infection on salivary properties among Nigerian children

BACKGROUND

There is growing evidence that perinatal HIV infection and exposure affect salivary pH and flow rate in children in most parts of the world, but not against the background of caries and the African demographic. This study aimed to evaluate the impact of HIV infection as well as exposure on salivary properties and their influence upon the dental caries experience among school-aged children in Nigeria.

METHOD

This cross-sectional study assessed the salivary flow rates and salivary pH of HIV infected and exposed school-aged (4-11) children receiving care at a Nigerian tertiary hospital. A total of 266 consenting participants which comprised of three groups as follows: (1) HIV Infected (HI) (n = 87), (2) HIV Exposed and Uninfected (HEU) (n = 82) and (3) HIV Unexposed and Uninfected (HUU) (n = 97) were recruited for the study. Questionnaires completed by parents/guardians were used for data collection. Three calibrated dentists performed oral examinations for dental caries. International Caries Detection and Assessment Scores (ICDAS) was used and presented as dmft/DMFT. Salivary pH was measured using MColourpHast™ pH indicator strips, while salivary flow rate was determined by collecting unstimulated whole saliva using the suction method. Data analysis relied on comparative statistics to determine the correlation between HIV exposure and infection on salivary pH and flow rates.

RESULT

Across the groups, (HI, HEU, and HUU) mean pH of the HI was significantly less than that of HEU and HUU. Similarly, there was a statistically significant difference in the SFR across the three groups (p = 0.004). Other variables such as gender, age and oral hygiene status expressed by the gingival inflammatory scores had no significant influence on the pH and SFR of study participants. There was a rather unexpected positive correlation of DMFT of HI and HEU groups with increasing salivary flow rate; though, the relationship was weak and not significant.

CONCLUSION

Perinatal HIV exposure and infection significantly impact salivary pH and flow rate among school-aged children in Nigeria. The findings of this study imply that HIV infection influenced the salivary pH, while HIV maternal exposure (without infection) impacted salivary flow rates when compared to the controls.

A 2-arm randomized controlled study to improve the oral health of children living with HIV in Nigeria: Protocol and study design

Background

Good oral health is an integral part of overall child health. However, immune-deficient states like the presence of Human Immunodeficiency Virus (HIV) will compromise oral health and salivary bacterial composition, leading to adverse oral conditions. Nigeria has 1.9 million HIV-positive residents, and 0.2% of incident HIV infections occur among children below 15 years.

Aim

This study aims to determine through a randomized control study, the effect of an educational intervention on the oral health status and oral health-related quality of life (OHRQoL) of HIV-positive children presenting to five pediatric HIV clinics in Kano, Nigeria.

Methods/Design

This 2-arm randomized control study will be conducted in five pediatric HIV outpatient clinics in Kano State, Nigeria over a period of 6 months. Eligible participants will include 172 HIV-infected frequency matched children aged 8-16 years (they can self-implement the oral health intervention with minimal supervision from the caregivers) who will be randomized and allocated into control and intervention groups. The evaluation and oral health assessment will be carried out by five examiners who will be trained and calibrated.

Discussion

Our findings will help inform policies to improve the oral health and OHRQoL of HIV-positive Nigerian children and inform the need to integrate oral health care services into HIV programs in similar settings.

Trial registration

ClinicalTrails.gov ID: National Clinical Trial (NCT) NCT05540171. Registered on 12th September 2022.

Supragingival mycobiome of HIV-exposed-but-uninfected children reflects a stronger correlation with caries-free-associated taxa compared to HIV-infected or uninfected children

IMPORTANCE

Globally, caries is among the most frequent chronic childhood disease, and the fungal component of the microbial community responsible is poorly studied despite evidence that fungi contribute to increased acid production exacerbating enamel demineralization. HIV infection is another global health crisis. Perinatal HIV exposure with infection are caries risk factors; however, the caries experience in the context of perinatal HIV exposure without infection is less clear. Using high-throughput amplicon sequencing, we find taxonomic differences that become pronounced during late-stage caries. Notably, we show a stronger correlation with health-associated taxa for HIV-exposed-but-uninfected children when compared to unexposed and uninfected children. This aligns with a lower incidence of caries in primary teeth at age 6 or less for exposed yet uninfected children. Ultimately, these findings could contribute to improved risk assessment, intervention, and prevention strategies such as biofilm disruption and the informed design of pro-, pre-, and synbiotic oral therapies.

Impact of HIV on the Oral Microbiome of Children Living in Sub-Saharan Africa, Determined by Using an rpoC Gene Fragment Metataxonomic Approach

Children living with HIV have a higher prevalence of oral diseases, including caries, but the mechanisms underlying this higher prevalence are not well understood. Here, we test the hypothesis that HIV infection is associated with a more cariogenic oral microbiome, characterized by an increase in bacteria involved in the pathogenesis of caries. We present data generated from supragingival plaques collected from 484 children representing three exposure groups: (i) children living with HIV (HI), (ii) children who were perinatally exposed but uninfected (HEU), and (iii) unexposed and therefore uninfected children (HUU). We found that the microbiome of HI children is distinct from those of HEU and HUU children and that this distinction is more pronounced in diseased teeth than healthy teeth, suggesting that the impact of HIV is more severe as caries progresses. Moreover, we report both an increase in bacterial diversity and a decrease in community similarity in our older HI cohort compared to our younger HI cohort, which may in part be a prolonged effect of HIV and/or its treatment. Finally, while Streptococcus mutans is often a dominant species in late-stage caries, it tended to be found at lower frequency in our HI cohort than in other groups. Our results highlight the taxonomic diversity of the supragingival plaque microbiome and suggest that broad and increasingly individualistic ecological shifts are responsible for the pathogenesis of caries in children living with HIV, coupled with a diverse and possibly severe impact on known cariogenic taxa that potentially exacerbates caries. IMPORTANCE Since its recognition as a global epidemic in the early 1980s, approximately 84.2 million people have been diagnosed with HIV and 40.1 million people have died from AIDS-related illnesses. The development and increased global availability of antiretroviral treatment (ART) regimens have dramatically reduced the mortality rate of HIV and AIDS, yet approximately 1.5 million new infections were reported in 2021, 51% of which are in sub-Saharan Africa. People living with HIV have a higher prevalence of caries and other chronic oral diseases, the mechanisms of which are not well understood. Here, we used a novel genetic approach to characterize the supragingival plaque microbiome of children living with HIV and compared it to the microbiomes of uninfected and perinatally exposed children to better understand the role of oral bacteria in the etiology of tooth decay in the context of HIV exposure and infection.

Age-specific associations with dental caries in HIV-infected, exposed but uninfected and HIV-unexposed uninfected children in Nigeria

Background

HIV infection and its management confer a substantial health burden to affected individuals and have been associated with increased risk of oral and dental diseases. In this study, we sought to quantify HIV-associated differences in the prevalence and severity of dental caries in the primary and permanent dentition of 4–11-year-old Nigerian Children.

Methods

We used clinical, laboratory, demographic, and behavioral data obtained from an ongoing cohort study of age-matched HIV-infected (HI, n = 181), HIV-exposed-but-uninfected (HEU, n = 177), and HIV-unexposed-and-uninfected (HUU, n = 186) children. Measures of dental caries experience (i.e., prevalence and severity) were based on dmft/DMFT indices recorded by trained and calibrated clinical examiners. Differences in primary and permanent dentition caries experience between HI, HEU, and HUU were estimated using multivariable logistic and negative binomial regression modeling.

Results

HI children had significantly higher caries experience (33%) compared to HEU (15%) and HUU (22%) children. This difference persisted in fully adjusted analyses [odds ratio (OR) = 1.6; 95% confidence interval (CI) = 1.0–2.6], was most pronounced in the permanent dentition (OR = 3.4; 95% CI = 1.2–9.5), and mirrored differences in caries severity. While molars were predominantly affected in both primary and permanent dentitions, caries lesion patterns differed between dentitions. Caries severity was significantly associated with hypoplastic primary teeth, gingival inflammation, and lower CD4 counts.

Conclusions

We found that the higher prevalence and severity of dental caries among HI children was driven by increased burden of permanent dentition caries compared to their uninfected counterparts. The dentition-specific associations identified in this study highlight the need to design and implement age-specific caries prevention strategies. These may include intensified oral hygiene regimens aimed at mitigating the cariogenic impact of hyposalivation among HI children. Similarly, the long-lasting impacts of developmental defects of the enamel in the primary and permanent dentitions must not be ignored.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12903-022-02421-w.

Caries experience by socio-behavioural characteristics in HIV-1-infected and uninfected Ugandan mothers - a multilevel analysis

OBJECTIVES

To assess caries experience in Ugandan mothers according to HIV status, socio-behavioural-characteristics, gingival bleeding status and to examine whether HIV status impacts the association of socio-behavioural characteristics with caries experience. Third, using multilevel analysis, this study assessed to what extent surface-specific caries experience varied between and within individuals.

MATERIALS AND METHODS

Caries experience was recorded using the World Health Organization's Decayed, Missed and Filled Teeth/Surfaces indices from a cohort of 164 HIV-1-infected Ugandan mothers and a cross sectional comparison group of 181 negative controls. Mixed-effects logistic regression was conducted with surface-specific caries experience as the outcome variable.

RESULTS

The prevalence of caries in HIV-1-infected and uninfected mothers was 81% and 71%, respectively. Significant associations occurred between caries experience at surface level and women's increasing age (odds ratio [OR] = 1.8, 95% confidence interval [CI]: 1.1-2.8) and presence of gingival bleeding (OR = 2.0, 95% CI: 1.2-3.2). Intra-class correlation (ICC) coefficient amounted to 0.54 (95% CI 0.48‒0.59).

CONCLUSIONS

Caries prevalence was higher in HIV-1 infected than in uninfected mothers and increased with age and gingival bleeding. ICC indicated that 54% of the variance was attributable to variation between individuals. Socio-demographic differences in dental caries did not vary by HIV-1 status.

Dental caries and its association with the oral microbiomes and HIV in young children-Nigeria (DOMHaIN): a cohort study

Background

This study seeks to understand better the mechanisms underlying the increased risk of caries in HIV-infected school-aged Nigerian children by examining the relationship between the plaque microbiome and perinatal HIV infection and exposure. We also seek to investigate how perinatal HIV infection and exposure impact tooth-specific microbiomes' role on caries disease progression.

Methods

The participants in this study were children aged 4 to 11 years recruited from the University of Benin Teaching Hospital (UBTH), Nigeria, between May to November 2019. Overall, 568 children were enrolled in three groups: 189 HIV-infected (HI), 189 HIV-exposed but uninfected (HEU) and 190 HIV-unexposed and uninfected (HUU) as controls at visit 1 with a 2.99% and 4.90% attrition rate at visit 2 and visit 3 respectively. Data were obtained with standardized questionnaires. Blood samples were collected for HIV, HBV and HCV screening; CD4, CD8 and full blood count analysis; and plasma samples stored for future investigations; oral samples including saliva, buccal swabs, oropharyngeal swab, tongue swab, dental plaque were collected aseptically from participants at different study visits.

Conclusions

Results from the study will provide critical information on how HIV exposure, infection, and treatment, influence the oral microbiome and caries susceptibility in children. By determining the effect on community taxonomic structure and gene expression of dental microbiomes, we will elucidate mechanisms that potentially create a predisposition for developing dental caries. As future plans, the relationship between respiratory tract infections, immune and inflammatory markers with dental caries in perinatal HIV infection and exposure will be investigated.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12903-021-01944-y.

HIV-Associated Interactions Between Oral Microbiota and Mucosal Immune Cells: Knowledge Gaps and Future Directions

Even with sustained use of antiretroviral therapy (ART), HIV-infected individuals have an increased risk of systemic comorbid conditions and oral pathologies, including opportunistic infections, oral mucosal inflammation, and gingival and periodontal diseases. The immune-mediated mechanisms that drive this increased risk, in the context of sustained viral suppression, are unclear. HIV infection, even when controlled, alters microbial communities contributing to a chronic low-grade inflammatory state that underlies these non-HIV co-morbidities. The higher prevalence of dental caries, and mucosal and periodontal inflammation reported in HIV-infected individuals on ART is often associated with differentially abundant oral microbial communities, possibly leading to a heightened susceptibility to inflammation. This mini-review highlights current gaps in knowledge regarding the microbe-mediated oral mucosal immunity with HIV infection while discussing opportunities for future research investigations and implementation of novel approaches to elucidate these gaps. Interventions targeting both inflammation and microbial diversity are needed to mitigate oral inflammation-related comorbidities, particularly in HIV-infected individuals. More broadly, additional research is needed to bolster general models of microbiome-mediated chronic immune activation and aid the development of precise microbiota-targeted interventions to reverse or mitigate adverse outcomes.

Oral Health Status of Young People Infected with HIV in High Epidemic Area of China

Purpose

This study aimed to understand the oral hygiene habits and oral health status of young people infected with human immunodeficiency virus (HIV) in Henan province of China.

Methods

Randomized stratified cluster sampling strategy was used to select young people who were receiving highly active anti-retroviral therapy (HARRT) from 6 towns. A total of 104 participants were enrolled and divided into 2 groups, adolescence group and young adult group. By face-to-face oral interview and examination, well-trained dentists collected general information, oral hygiene habits and oral health status of the participants.

Results

Fifty-eight of them were adolescence group and 46 of them were young adult group. In two groups, most of them brushed their teeth once a day (55.20%, 67.40%), and half of them basically brushed their teeth for 2 minutes (51.7%, 50.0%). Majority of participants did not use dental floss (93.1%,91.3%) and also never visited a dentist (81%,78.3%). One-third of participants had spontaneous bleeding, and about half of them had gingival bleeding when brushed their teeth. The most frequent mucosal disease was oral ulcers. Moreover, the prevalence of caries remained very high in both groups, which was 82.76% and 84.8%, respectively. Most of the participants in both groups had low education level and received less than 9 years of education (65.5%, 63%).

Conclusion

The participants had poor oral hygiene habits. The economic and education level may associate with the awareness of oral health and care.

Is there an association between viral load, CD4 count, WHO staging, and dental caries in HIV-positive children?

BACKGROUND

Few studies have investigated an association between CD4 counts, viral load (VL), WHO staging, and caries among HIV-positive (HIV+) children on HAART therapy (>12 months).

AIM

To determine the strength of association between CD4 counts, WHO staging, VL, and dental caries.

DESIGN

This cross-sectional analytical study comprised of 355 HIV + children, aged 4-12 years, attending a hospital in Johannesburg, South Africa. Demographic and clinical data such as decayed (d,D), missing (m,M), filled teeth (f,F) [dmft/DMFT], CD4 counts, and WHO staging were collected. Correlation and regression analyses were done to test for associations.

RESULTS

Caries prevalence for this cohort of children was 57%. The dmft score for the primary dentition was 4.36 (SD 4.87) and DMFT for secondary dentition was 0.58 (SD 1.49). Pearson's correlation analyses showed significant association between VL and CD4 count (P = .003) and VL and WHO stage (P = .007). Weak associations were noted between caries (d, D) and VL, CD4 count, and WHO stage of disease for correlation and regression analyses.

CONCLUSION

There appears to be no substantial evidence of any significant association between the presence of caries among HIV + children and CD4 counts, viral load, and WHO clinical stage of the disease.

Antiretroviral treatment and its impact on oral health outcomes in 5 to 7 year old Ugandan children: A 6 year follow-up visit from the ANRS 12174 randomized trial

BACKGROUND

Antiretroviral therapy for HIV in sub-Saharan Africa has transformed the highly infectious virus to a stable chronic condition, with the advent of Highly active antiretroviral therapy (HAART). The longterm effects of HAART on the oral health of children are understudied.

OBJECTIVE

To compare the effect of lopinavir-ritonavir and lamivudine on oral health indicators (dental caries, gingivitis, tooth eruption, and oral health related quality of life) in 5 to 7 year old HIV-1 exposed uninfected children from the ANRS 12174 trial.

METHODS

This study used data collected in 2017 among children aged 5 to 7 years from the Ugandan site of the ANRS 12174 randomized trial (ClinicalTrials.gov no: NCT00640263) implemented between 2009 and 2012 in Mbale district, Eastern Uganda. The intervention was lopinavir-ritonavir or lamuvudine treatment to prevent vertical HIV-1 transmission. One hundred thirty-seven and 139 children were randomized to receive lopinavir-ritonavir or lamivudine treatment at day 7 postpartum to compare efficacy of prevention of vertical HIV-1 transmission. At follow up, the children underwent oral examination using the World Health Organization methods for field conditions. The oral health related quality of life was assessed using the early childhood oral health impact scale. Negative binomial and logistic regression were used for the analysis of data.

MAIN OUTCOME MEASURES

Dental caries, gingivitis, tooth eruption, and oral health related quality of life) in 5 to 7 year old HIV-1 exposed uninfected children.

RESULTS

The prevalence of dental caries was 48% in the study sample: 49% in the lopinavir-ritonavir arm and 48% in the lamivudine treatment group. The corresponding mean decayed missing filled teeth and standard deviation was 1.7 (2.4) and 2.3 (3.7) The mean number (standard deviation) of erupted permanent teeth was 3.8 (3.7) and 4.6 (3.9) teeth in the lopinavir- and lamivudine group, respectively. The prevalence of reported impacts on oral health was 7% in the lopinavir-ritonavir and 18% in the lamivudine group. Gingivitis had a prevalence of 7% in the lopinavir-ritonavir and 14% lamivudine treatment group. The regression analysis revealed 70% less reported impacts on oral health in lopinavir-ritonavir group than the lamivudine treatment group with an incidence rate ratio of 0.3 (95% confidence interval: 0.1-0.9).

CONCLUSIONS

HIV exposed uninfected infants in the lopinavir-ritonavir group reported less impacts on oral health than the lamivudine treatment group. Dental caries, gingivitis, and tooth eruption were not significantly affected by the treatment lopinavir-ritonavir or lamivudine. TRIAL REGISTRATION CLINICALTRIALS.

GOV IDENTIFIER

NCT00640263.

Immune status, and not HIV infection or exposure, drives the development of the oral microbiota

Even with antiretroviral therapy, children born to HIV-infected (HI) mothers are at a higher risk of early-life infections and morbidities including dental disease. The increased risk of dental caries in HI children suggest immune-mediated changes in oral bacterial communities, however, the impact of perinatal HIV exposure on the oral microbiota remains unclear. We hypothesized that the oral microbiota of HI and perinatally HIV-exposed-but-uninfected (HEU) children will significantly differ from HIV-unexposed-and-uninfected (HUU) children. Saliva samples from 286 child-participants in Nigeria, aged ≤ 6 years, were analyzed using 16S rRNA gene sequencing. Perinatal HIV infection was significantly associated with community composition (HI vs. HUU—p = 0.04; HEU vs. HUU—p = 0.11) however, immune status had stronger impacts on bacterial profiles (p < 0.001). We observed age-stratified associations of perinatal HIV exposure on community composition, with HEU children differing from HUU children in early life but HEU children becoming more similar to HUU children with age. Our findings suggest that, regardless of age, HIV infection or exposure, low CD4 levels persistently alter the oral microbiota during this critical developmental period. Data also indicates that, while HIV infection clearly shapes the developing infant oral microbiome, the effect of perinatal exposure (without infection) appears transient.

Malnutrition, enamel defects, and early childhood caries in preschool children in a sub-urban Nigeria population

Objectives

The study tried to determine if malnutrition (underweight, stunting, wasting, overweight) and enamel defects (enamel hypoplasia, hypomineralized second molar, amelogenesis imperfecta, fluorosis) were associated with early childhood caries (ECC). The study also examined whether malnutrition was associated with the presence of enamel defects in 0-5-year-old children.

Methods

The study was a secondary analysis of primary data of a cross-sectional study assessing the association between maternal psychosocial health and ECC in sub-urban Nigerian population collected in December 2018 and January 2019. One hundred and fifty nine children were recruited. Exploratory variables were malnutrition and enamel defects. The outcome variables were the prevalence of ECC in 0-2-year-old, 3-5-year-old, and 0-5-year-old children. Multivariable Poisson regression analysis was used to determine the associations, and socioeconomic status, oral hygiene status, and frequency of in-between-meals sugar consumption were adjusted for. The adjusted prevalence ratios, 95% confidence intervals, and p values were calculated.

Results

The prevalence of ECC was 2.1% in 0-2-year-old children and 4.9% in 3-5-year-old children. In adjusted models, underweight, stunting, and wasting/overweight were not significant risk indicators for ECC in either age group. 0-2-year-old children who had amelogenesis imperfecta (p<0.001) and fluorosis (p<0.001) were more likely to have ECC than were children who did not have these lesions. 3-5-year-old children who had hypoplasia (p = 0.004), amelogenesis imperfecta (p<0.001) and fluorosis (p<0.001) were more likely to have ECC than were children who did not have these lesions. 0-5-year-old children with hypoplasia (p<0.001) and fluorosis (p<0.001) were more likely to have ECC than were children who did not have these lesions. There were significant associations between various types of malnutrition and various types of enamel defects.

Conclusion

Although different types of malnutrition were associated with enamel defects, and enamel defects were associated with ECC, malnutrition was not associated with ECC. Further studies are needed to clarify the association between malnutrition and genetically and toxin-induced enamel defects.

Caries experience and oral health related quality of life in a cohort of Ugandan HIV-1 exposed uninfected children compared with a matched cohort of HIV unexposed uninfected children

Background

Very few studies consider the oral health status and quality of life in HIV-1 exposed uninfected (HEU) children. The aim of this study was to estimate the prevalence of caries in primary teeth and its oral health related quality of life impacts in HEU children compared to HIV-unexposed-uninfected (HUU) children, whilst adjusting for confounding covariates.

Methods

This study uses data from the Ugandan site of the ANRS 121741 PROMISE- PEP trial (ClinicalTrials.gov, number NCT00640263) conducted in 2009–2013 that recruited mothers with HIV-1 and their uninfected children. Of 244 HEU-children-caretaker pairs available at the end of the one-year trial, 166 were re-enrolled in the ANRS 12341 PROMISE-PEP M&S study at 5–7 years and 164 were included in this study. These were age and sex-matched with 181 HUU children-caretaker comparators. Caries experience was recorded using World Health Organization’s Decayed, Missed and Filled teeth (dmft/DMFT) indices. The Early Childhood Oral health Impact Scale (ECOHIS) was used for assessment of oral health related quality of life. Mixed effects logistic regression was conducted with dmft and ECOHIS scores as outcomes and HIV-1 exposure status as the main exposure.

Results

Forty-eight percent of HEU children and 60% of HUU had dmft> 0. Corresponding figures for ECOHIS> 0 were 12% of HEU and 22% of HUU. The crude analysis showed differences related to HIV-1 exposure in caries experience and oral health related quality of life. Mixed effect logistic regression analyses were not significant when adjusted for use of dental care and toothache. If caregivers’ DMFT> 0, the adjusted odds ratio for caries experience (dmft> 0) was 1.6 (95% CI: 1.0–2.8) while if dmft> 0 the adjusted odds ratio for quality of life impacts (ECOHIS> 0) was 4.6 (95% CI: 2.0–10.6).

Conclusion

The prevalence of untreated caries in primary teeth and quality of life impacts was high in this study population. HIV-1 exposed uninfected children were not more likely than HUU children to experience dental caries or have impaired oral health related quality of life. Given the global expansion of the HEU child population, the present findings indicating no adverse effect of pre- and post-natal HIV-1 exposure on caries in deciduous teeth are reassuring.

Association of maternal HIV-1 severity with dental caries: an observational study of uninfected 5- to 7-yr-old children of HIV-1-infected mothers without severe immune suppression

Treatment programs to prevent perinatal and postnatal HIV-1 transmission have become available in sub-Saharan Africa, leading to an emerging population of HIV-1 exposed uninfected (HEU) children. Exposure to HIV-1 in utero and during breastfeeding may increase the risk of morbidity and mortality in HEU children. This study estimated the association of the severity of maternal HIV-1 infection as assessed by CD4 count and viral load at baseline (7 d postpartum), with  dmft count of their 5- to 7-yr-old HEU offspring. A follow-up study was conducted of HIV-1-infected mother-HEU children pairs (n = 164) from the Ugandan site of the ANRS 12341-PROMISE- PEP trial (ClinicalTrials.gov, number NCT00640263). HIV-1-infected mothers were interviewed and the HEU children were examined for caries using the World Health Organization's survey methods for field conditions and the dmft index. Directed acyclic graphs and negative binomial regression were used for analyses. The prevalence of 1 or more dmft was 48%. Negative binomial regression showed no association between the dmft count and maternal CD4 counts 7 d postpartum but a 10% lower dmft count with longer breastfeeding duration was found. Maternal CD4 count at birth was not associated with the dental caries experience in uninfected children born to women without severe immune suppression, while there appeared to be a protective effect of high viral load and breastfeeding duration.