Dental Caries Status and Relevant Factors in Children with Primary Nephrotic Syndrome in National Children Hospital, Vietnam

Objectives: 1) To give a description for dental caries status of children suffer ing primary nephrotic syndrome in National Children’s Hospital 2016-2017; 2) to provide a comment on mentioned-above children dental caries rate related factors. Method: this is a descriptive cross-sectional study conducted on 236 children 6-14 years old who are diagnosed with primary nephrotic syndrome and under treatment in Department of Nephrology -Dialysis in National Children’s Hospital from 11/2016 to 5/2017 Results: Caries rate of researched object is 90.7%; 6-8 group presents a deciduous teeth-caries rate of 9%, dmft index: 6.54; Group 9-11 and 12-14 presents a permanent teeth-caries of 73.4% (DMFT = 2.39) and 87.1 (DMFT = 3.58) respectively. The patient group sufferingsteroid-resistant type presents a risk of 3.21 times higher than the group with steroid-dependent type (OR = 3.21 and 95% CI is 1 .09-9.42); The group with steroid-sensitive type presents a risk of 3.03 times higher than the group with steroid-dependent type (OR=3.03 and 95%CI is 1.0 – 9.65). Conclusions: Caries rate in children related to primary nephrotic syndrome is signifi cantly high. Oral hygiene practice of children related to pr imary nephrotic syndrome is a caries rate related factor. Research Article Dental Caries Status and Relevant Factors in Children with Primary Nephrotic Syndrome in National Children Hospital, Vietnam Tong Minh Son1*, Nguyen Thu Huong2, Tran Thi My Hanh3, Ha Ngoc Chieu4, Le Thi Thuy Linh5, Pham Thi Phuong6 and Le Hung7 1Assoc. Prof, Department of Prosthodontics, Hanoi Medical University, Hanoi, Vietnam 2Nguyen Thu Huong, PhD, MD, Departament of Nephrology and Dialysis, National Children’s Hospital. 3Tran Thi My Hanh, PhD, Departament of Pediatric Dentistry, Hanoi Medical University, Hanoi, Vietnam 4Dr, Department of Dental Public Health, Hanoi Medical University, Hanoi, Vietnam 5M.S, Department of Pediatric Dentistry, Hanoi Medical University, Hanoi, Vietnam 6Postgraduate Student at Hanoi Medical University, Hanoi, Vietnam 7PhD. Dong Da Hospital, Hanoi, Vietnam Received: 19 December, 2017 Accepted: 29 December, 2017 Published: 02 January, 2018 *Corresponding author: Tong Minh Son, Associate Professor, Department of Prosthodontics, Hanoi Medical University, Hanoi, Vietnam, Tel: +84912670670; E-mail: https://www.peertechz.com


Introduction
Nephrotic syndrome (NS) is one of the most popular nephropathy in kids, according to statistics of National Children's Hospital, In Vietnam during decades 1981-1990 the number of NS children occupied 1.7% total in-patients, and 46.6% total patients of Nephro-Urology Department [1]. Ho Chi Minh City Children Hospital No 1 annually receives an average number of 300 NS patients, accounting for 0.7% total hospitalized children, and 38%hospitalized patients under Nephrotic diseases [2]. NS patients stand under a high recrudescence rate (55-60%) and can be resulted in extreme complications such as vasodepressor, anglemphrasis and infection etc. even resistance followed with risk of chronic renal failure requiring dialysis and kidney transplant [3], the disease often get recrudesced after aninfection. Thus, all infection contains bacterial oral contamination (caries, gingivitis, apical periodontitis, pericoronal abscess etc.) require an urgent and continuous treatment. According to Cheryl Thomas and R.D.H, complications of chronic nephropathy will impact on hard tissue and soft tissue in oral. Oral mucosa, teeth, bone, tongue and salivary gland will be all affected by chronic nephropathy [4]. Thus, reality of caries and oral care in children suffering primary nephrotic syndrome (PNS) needs a signifi cant notice. Therefore, we conduct this study to: Giving a description for reality of children suffering primary nephrotic syndrome in National Children Hospital 2016-2017.
Providing some comments on factors related to caries rate of such children group.

Material and Method
The research will be conducted on 236 children diagnosed suffering primary nephrotic syndrome and being under treatment in Nephro-Dialysis Department of National proteinuria≥ 50mg/kg/24 hours, blood protide < 56 g/l, blood albumin< 25 g/l [5][6].
Inclusion criteria: age from 6-14, existing primary nephrotic syndrome, engaged permit of family or elders for the research.
ICDAS 1997 based cries diagnosis was revised on 2013. Decayed-missing-fi lled index (DMFT): It is the total number of deciduous teeth by decayed ones + missing ones + fi lled ones. The decayed-missing-fi lled index for permanent teeth: is the total number of permanent teeth by decayed ones + missing ones + fi lled ones Or al Care Practice: conducting interview with researched objects by Research Form (Table 1), then the Oral Care Practice grade will be calculated as following: + Total grade ≤ 3 indicates an "Ill Practice" + Total grade ≤ 3 indicates an "Good Practice" As f or PNS, we will obtain following records: disease type, disease time and recrudescence from the initial diagnoses until research and applying medicine Figures will be processed and calculated by SPSS 16.0 Research morality: the research is permitted only with agreement of children and family. All their information will be subjected to confi dence and for research purposes only.
-Group 12-14 has the highest DMFT index 3.58. Indicating an average number of 3.5 decayed permanent teeth for each patient. (Table 3).
Oral ca re practice is relevant to dental caries status. Particularly, caries rate in the Ill practice group is signifi cantly higher than the Good practice group. Such difference presents a statistical meaning with p<0.05 (fi sher's exact test) ( Table  4).

Relationship between dental caries with primary nephrotic syndrome
-Existin g a statistical meaning difference between disease type and dental caries status. The patient group with steroidresistant type presents a dental risk of 3.21 times higher than times higher than the group with steroid-dependent type (OR = 3,21 and 95% CI is 1,09-9,42); The group with steroid-sensitive type presents a risk of 3.03 times higher than the group with steroid-dependent type (OR=3,03 and 95%CI is 1,0 -9,65).
-The patient group with treatment period more than 5 years presents a dental caries risk of 1,95 times higher than the group with treatment period under 5 years. However, the difference is not statistically signifi cant.
-the patient group being under treatment course presents a dental caries risk of 1.47 times higher than the treatmentpaused group. However, the difference is not statistically signifi cant.
-The cycloporine -used patient group has a dental caries risk of 1.53 higher than the cycloporine-unused group. However, the difference is not statistically signifi cant.
The patient group with recrudescence frequency 1-3 times presents a dental caries risk of 3.19 times higher than the group with initial caries. The group with recrudescence frequency more than 3 times has a dental caries risk more than 2.04 times the group with initial caries. However, such difference is without statistical meaning (Table 5).

Dental caries rate in researched objects
The research indicates the dental caries rate of 90.7% (Chart 1) which is ranked to the top class.
Deciduous teeth caries rate of group 6-8 is the highest one (93%), lowered to 73.4% in the group 9-11 and 8.57% in the group 12-14. These results are generally higher than the national oral health survey results in 2002 of Vietnam by Tran Van Truong and Lam Ngoc An: Deciduous teeth caries rate in 6-8 children was 84.9%, in 9-11 56.3% [8].
Permanent teeth caries rate of the group 6-8 is 42.1%; group 9-11 73.4% and the highest, 78.1%, is of group 12-14. These results matches with that of Tran Van Truong 2002, permanent caries rate is different between the groups and increases gradually by age [8] which can be explained by accumulation by time of dental caries.
In comparison with results of Tran Van Truong and indexes in 12 provinces and cities over the country in 2002 [8], as well as results of Nguyen Anh Son's research (Deciduous teeth caries rate: 67.2%, Permanent teeth caries rate: 59.2%) [9], the various dental caries rates in our research are all higher. It is due to our nephrotic syndrome-related researched subject we chose, partly comes from side-effect of xerosfomia-causing medicament which reduces saliva fl ow and causes dental plate accumulation. This is a risk factor causing dental caries rate increase. In addition, because of PNS of the children in this research, families just focus on body disease while the oral care practice is neglected. These results matches with study of Anna Piróget. al (2012) conducting study of a disease group upon 60 children (8,4 ± 4,6 years old) suffering nephrotic syndrome and the control group with 55 children at the same age (10,04 ± 4,79 years old) without other chronic diseases or using medicine in long-term [10]. The results indicate that general dental caries rate in PNS group is higher than the control group, leading the authors to the conclusion that all PNS children suffer a dental caries risk higher than the normal.

Decayed-missing-fi lled teeth index of the researched objects
Untreated decayed deciduous teeth index of the PNS children is rather high (3,91), treated rate (including dental extraction and fi lling) is very low (0.07). Thus, PND children   suffer a high risk and incidence of dental caries without a worth concentration of treatment. If such fact remains, masticatory force, permanent jaw quality and development, as well as treatment performance of existing disease will be impacted signifi cantly. Table 3 shows DMFT of the researched group 2.42, averagely each patient has 2.36 decayed permanent teeth. This result is higher than that of Nguyen Thu Hang's research 2013 upon 12 Vietnamese children with DMFT 1.49 [11]. In this research, DMFTs present a difference and takes an increase by age groups. This is explained by the fact that the more children grow, the higher exposure time to risk factor is, leading to an increase of dental caries accumulation. Permanent teeth caries rate in NS children in our research is 69.5%, really being a social concerned problem.

Relationship between dental caries and oral care practice
Oral care practice is relevant to dental caries status. Particularly, 100% patient if good practice group have not dental caries at all, while 97.3% patient in the Ill practice suffer dental caries. Such difference bears a statistical meaning with p < 0.05 (fi sher's exact test) ( Table 4).

Relationship between nephrotic syndrome characteristics and dental caries status
Existing a statistical meaning difference between disease type and dental caries status. The patient group with steroidresistant type presents a dental risk of 3.21 times higher than times higher than the group with steroid-dependent type (OR = 3,21 and 95% CI is 1,09-9,42); The group with steroid-sensitive type presents a risk of 3.03 times higher than the group with steroid-dependent type (OR=3,03 and 95%CI is 1,0 -9,65). Steroid-resistant type and sensitive type increase dental caries risk mainly due to an ill oral hygiene practice, and further due to ill enamel or xerostomia increasing dental caries rate.

Conclusion
De ntal caries rate in children suffering primary nephrotic syndrome is signifi cant high. Oral care practice and nephrotic syndrome type are relevant to dental caries rate.