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Duran-Merino Denisse1, Molina-Frechero Nelly1*, Castañeda-Castaneira Enrique1, Gaona Enrique1, Reyes-Reyes Rosa E1,2, Tremillo-Maldonado Omar1, del Muro-Delgado Ruben1,2, Juárez-López Maria Lilia3 and Bologna-Molina Ronell4
1 Biological and Health Sciences Division, Metropolitan Autonomous University Xochimilco, Mexico City, Mexico, Email:
2 National Institute of Pediatric, Mexico City, Mexico
3 Dental School, FES Zaragoza, National Autonomous University of Mexico, Mexico
4 Molecular Pathology, Faculty of Dentistry, Universiity of the Republic, Montevideo, Uruguay, Email:
*Correspondence: Molina-Frechero Nelly, Metropolitan Autonomous University Xochimilco, Calzada del Hueso 1100, Mexico, Tel: +52 55 5695 2916, Email:

Citation: Denisse DM, et al. Relationship between Periodontal Disease and Type 1 Diabetes in Adolescents. Ann Med Health Sci Res. 2017; 7: 350-354

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Aim: The aim of this study was to evaluate the prevalence and severity of periodontal disease (PD) in adolescents with type 1 diabetes mellitus (DM) and assess the relationship with the clinical and metabolic control of diabetes in adolescents. Material and Methods: A descriptive and analytical study was conducted in patients of both sexes who had a definite diagnosis of type 1 DM and diabetes duration of at least 3 years. An odontologist evaluated PD using the American Dental Association criteria. The measured glycosylated hemoglobin (HbA1c) levels revealed an association between PD and the duration and metabolic control of DM. Results: One hundred and one patients with an average age of 15.02 ± 1.216 years were studied; 59.4% were female. Adolescents with a shorter diabetes duration (3 to 5 years) had a lower prevalence of PD (65.6% versus 34.4%); and for those with a disease duration > 6 years, stages II-IV PD predominated (56.8%, p<0.05). The most severe stages of PD were present in young people with ≥ 9% HbA1c (p<0.001). Males had a higher prevalence of PD than females in terms of disease duration and metabolic control of diabetes (p<0.05). Conclusion: The severity of PD was associated with the duration of diabetes and higher glycemic levels, with worse effects for males than females.


Periodontal disease; Type 1 diabetes mellitus: Metabolic control


Periodontal disease (PD) is a set of immune and inflammatory conditions of infectious etiology that affect tooth-supporting tissues, such as gums, cementum, periodontal ligament and alveolar bone. [1-4] PD is associated with the presence of microorganisms in the dental plaque attached to the enamel and with the microflora of the gingival sulcus, causing inflammatory lesions that result in the damage and destruction of toothsupporting tissues. [5-7]

In healthy periodontal tissue, the gums are firm and pale pink in color, do not bleed and cover the entire root of the tooth, stabilizing teeth in conjunction with periodontal ligament fibers. [8,9]

In gingivitis, dental plaque and tartar cause gingival irritation, resulting in mucosal redness and edema, with or without bleeding, and with no attachment loss at this stage. In periodontitis, there is destruction of periodontal fibers, and periodontal pockets may be present, depending on the severity of PD. In more advanced stages, molar furcation lesions, tooth mobility, and bone loss may occur, leading to tooth loss. [10,11]

There are many risk factors that an odontologist should evaluate to determine the presence, course and severity of PD, such as gender, race, age, oral hygiene habits, socioeconomic status, medications, drug abuse, smoking, stress, AIDS, malnutrition, osteoporosis, use of steroids and oral contraceptives and the presence of some systemic diseases, such as diabetes mellitus (DM). [12-15]

Type 1 DM is a chronic degenerative disease characterized by impaired glucose metabolism due to an absolute insulin deficiency caused by autoimmune damage to pancreatic beta cells. This type of insulin-dependent DM can be accompanied by multiple metabolic, organs, vascular and infectious complications. When a patient has a systemic disease, the inflammatory response in the oral cavity is altered by the presence of local irritants and infection, accelerating the progression of PD and increasing dental pathology. Diabetic patients also have diminished resistance to infection, with increased salivary glucose levels and a greater tendency to form dental plaque. [16,17]

The association between DM and PD has been studied by several authors, since these patients have a decreased immune response, mainly related to T cells, and altered polymorphonuclear cell (granulocyte) function, causing infections in the oral cavity. [18,19] A higher prevalence and severity of PD has been shown in these patients, possibly due to excessive tissue inflammation, leading to early periodontal attachment and alveolar bone loss. [20,21] An association between periodontitis and poor metabolic control of diabetics has also been reported. Some studies report that effective treatment of periodontal infection reduces hyperglycemia, glycosylated hemoglobin (HbA1c) levels and, in many cases, even insulin requirements.

HbA1c is a blood laboratory test that retrospectively estimates the mean glucose concentration measured over a period of 8-12 weeks. HbA1c is currently used to evaluate the metabolic control of diabetic patients, is expressed as a percentage and is correlated with mean glucose levels. When HbA1c levels range from 5% to 6% (80-120 mg/dL), the results are considered normal, and when HbA1c levels are higher than 7-8% (150-180 mg/dL), the results are indicative of decompensated or poorly controlled diabetes. [20,21]

The objective of the present study was to evaluate the prevalence and characteristics of PD in adolescents with type 1 DM and to assess the relationship between diabetes duration and its clinical and metabolic control.

Materials and Methods

A descriptive analytical study was conducted in male and female adolescent patients with a definite diagnosis of type 1 DM and diabetes duration of at least 3 years who attended the XXI Century National Medical Center Pediatrics Hospital and agreed to participate in the study. A qualified odontologist performed an oral examination and evaluated PD using the American Dental Association (ADA) criteria, [22] calibrated with a Kappa index > 0.86. PD was classified into 4 stages according to PD severity as follows: stage I for gingivitis and stages II, III and IV for periodontitis. In gingivitis, dental plaque causes gingival inflammation, the gingiva is red and may bleed, there is no periodontal attachment loss or tooth mobility, toothsupporting tissues are still not damaged, and pseudopockets may be present. Stage II, or mild periodontitis, is characterized by the fact that bleeding on probing may be present in the active phase, there is a loss of periodontal fibers, and the pocket depth or attachment loss is 3 to 4 mm. Stage III, or moderate periodontitis, is characterized by bleeding on probing and a pocket depth or attachment loss of 4 mm to 6 mm. Stage IV, or severe periodontitis, is characterized by bleeding on probing and a pocket depth or attachment loss of >6 mm.

Diabetic patients were classified into groups based on the duration of diabetes: those with disease duration between 3 and 5 years and those with a disease duration of more than 6 years.

HbA1c measurements from the previous 2 or 3 years were evaluated to determine the usefulness of the laboratory test for the glycemic control of the studied diabetic patients. Based on the test results, patients were classified as diabetic patients with HbA1c controlled to < 7% (120-150 mg/dL) and as diabetic patients with uncontrolled HbA1c > 7% (150-180 mg/dL).

Analysis of the results: The data were collected in a format designed for the study and were later transferred for analysis using descriptive statistics with measures of central tendency and dispersion. For the qualitative variables, frequencies and proportions were used; for the quantitative variables with a normal distribution, the arithmetic mean and standard deviation were calculated. The chi-squared (χ2) test and Student’s t-test were used for the bivariate comparison of means, and ANOVA was used for at least 3 means. Pearson’s correlation coefficient was used to evaluate how PD is related to the duration and metabolic control of diabetes and to sex. Significant results were incorporated into the logistic regression to assess the significance of the model. The results were considered statistically significant at p< 0.05. The analysis was performed in the statistical software package IBM SPSS version 21 Armonk, NY, USA.


The sample included 101 patients, whose mean age was 15.02 ± 1.216 years, ranging from 13 to 17 years; 59.4% of the patients were female, and 40.6% were male. In the oral examination, 51 (50.6%) adolescents had PD, of which 13.9% had gingivitis and 36.7% had periodontitis (p< 0.001).

The stages found in patients with PD were as follows: stage I PD, 27.5%; stage II PD, 37.3%; stage III PD, 25.5%; and stage IV PD, 9.8%.

Table I shows the assessment of diabetes duration, with diabetic patients categorized into the following 2 groups: those with disease duration between 3 and 5 years and those with disease duration of more than 6 years. The highest percentage of patients with stage II-IV PD was found in the young people who had the longest duration of diabetes. Table 1 shows that patients with a longer DM duration were more likely to have severe stage III-V PD and those with a shorter duration of DM had mild stage 0-I PD. There were significant differences between these stages depending on the duration of diabetes (p< 0.05).

 Variables Diabetes duration
3 to 5 years > 6 years
  N % N %
Population                                     58 57.42 43 42.58
Stage 0-I PD 42 65.62 22 34.38
Stage II-IV PD 16 43.24 21 56.76

Table 1: Characteristics of PD in relation to DM duration.

Table 2 shows that for the 79 patients with HbA1c controlled to< 7% (78.22% of the patients), the majority (81.01%) had stage 0-I PD. In contrast, for the patients with poorly controlled HbA1c of > 7%, all 22 (100%) had stage II-IV PD, with more severe oral disease. That is, analysis of the HbA1c levels measured during the previous 2 years in terms of the presence of PD indicated a significant difference between the HbA1c levels: the prevalence of PD was inversely related to the metabolic control of diabetes (p=0.000).

Variables < 7 HbA1c > 7 HbA1c
  N % N %
Population                                     79 78.22 22 21.78
Stage 0-I PD 64 81.01 0 0.00
Stage II-IV PD 15 18.99 22 100.00

Table 2: PD in relation to the control of HbA1c levels.

Table 3 shows the severity of PD by sex, duration of diabetes and metabolic control of diabetes. The results showed that 73.3% of females had the least severe cases (stage 0-I PD); the shorter diabetes duration was also observed in females (66.7%), and females also had the highest metabolic control of their diabetes (96.7%).

Variables Females Males
  N % N %
Periodontal disease                                  
Stage 0-I PD 44 73.3 20 48.8
Stage II-IV PD 16 26.7 21 51.2
Diabetes duration
< 3-5 years 40 66.7 18 43.9
> 6 years 20 33.3 23 56.1
Metabolic control
< 7 HbA1c 58 96.7 21 51.2
> 7 HbA1c 02 3.3 20 48.8
χ2 5.259, p=0.022; PD by sex.  
χ2 5.163, p=0.023; Diabetes duration by sex.
χ2 29.527, p=0.000; Metabolic control by sex.  

Table 3: PD, duration of diabetes and metabolic control of diabetes in diabetic patients by sex.

Table 4 shows that males were more affected and had a greater risk of having the disease. When the duration of diabetes was > 5 years, the disease had an odds ratio (OR) of 0.218 (confidence interval (CI) 0.17-0.375; p=0.028), and when HbA1c was > 7, stage II-IV PD was present in 72.7% with an OR of 0.523 (CI 0.408-0.646).

  N % # % # % 95%CI P-value
Female 60 59.4 44 73.3 16 26.7 reference
-0.225 (-0.421 to -0.028)
Male 41 46.6 20 48.8 21 51.2
Total     64   37    
Disease duration
3-5 years 58 57.4 42 72.4 16 27.6 reference
0.218 (0.017 to 0.375)
> 5 years 43 42.6 22 51.2 21 48.8
Total     64   37    
Metabolic control
< 7 HbA1c 79 78.2 58 73.4 21 26.6 reference
0.523 (0.408 to 0.646)
> 7   HbA1c 22 21.8 6 27.3 16 72.7
Total     64   37    

Table 4: Severity of PD and relationship with independent variables.

Table 5 shows the logistic regression between the severity of PD and the independent variables of sex, duration of diabetes and metabolic control of diabetes, with the latter being statistically significant (p< 0.05).

Variables B Wald p-value
Sex -0.931 3.387 0.066
Diabetes duration 0.461 0.934 0.334
Metabolic control 1.342 4.681 0.031

Table 5: Logistic regression model using PD severity and independent variables.


In the studied population, PD was present in more than half of the adolescents, with 13.9% having stage I gingivitis and the remaining 86% having stage II-IV periodontitis. These results show that there is an association between DM and PD and are in agreement with those reported by other authors, who found evidence of an association between various systemic diseases, including DM and periodontal health. [23]

In this study of type 1 diabetic patients, there was a high prevalence of PD compared to the prevalence and severity reported by other authors in the general population and in type 2 diabetics. [24,25]

Adolescents with a shorter diabetes duration (3 to 5 years) had a lower prevalence of PD (65.6% versus 34.4%); and for those with a disease duration > 6 years, stages II-IV PD predominated (56.8%, p< 0.05). This is interpreted as the duration of diabetes was a risk factor that influenced the prevalence and severity of PD. Patients with a shorter duration of diabetes had less PD, while those with a longer duration had a higher prevalence and severity of PD.

Using HbA1c levels, the mean blood glucose levels of the last 3 months were evaluated, which helped to determine the metabolic control of diabetes. Patients with hyperglycemia and poorly controlled diabetes had a higher prevalence and severity of PD than those with good diabetic control (HbA 1c >7%). Therefore, poorly controlled diabetes not only increases the prevalence of PD but is also a risk factor for severe periodontitis; in other words, the severity of PD is inversely related to the metabolic control of diabetes (p=0.000).

The HbA1c levels indicated that 78.2% of patients with controlled diabetes had stage 0-I PD, and the remaining patients with HbA1c > 7% had stage II-IV PD, so a direct relationship was found between the metabolic control of diabetes and PD (p=0.000). [26]

These results are in agreement with the studies conducted by Jirdal A. et al. [27] in type I diabetic patients, where the researchers found that the severity of PD increased with poor HbA1c control. Silvestre FJ et al. [28] also examined the prevalence of PD in type I diabetic patients and related PD to the metabolic control and duration of diabetes. Comparison of the results with those of nondiabetic patients showed that the group with poorly controlled diabetes had a higher prevalence and severity of PD. In the present study, 27.3% of the adolescents with poorly controlled diabetes had stage 0-I PD, and the majority of those with poorly controlled diabetes had severe PD stages, demonstrating a direct relationship between poorly controlled DM and PD severity. Hyperglycemia and immunological deficiencies in diabetic patients are factors that can cause oral infections that lead to PD.

Additionally, Costa KL et al. [29] revealed the importance of diabetes control by measuring HbA1c levels; the researchers found better periodontal health in the patients with lower HbA1c levels and found an association between the progression of periodontitis and increased HbA1c levels. The above suggests that the control of PD can improve glycemic control and vice versa: glycemic control decreases the prevalence and severity of PD. [30,31]

A higher proportion of the females had stage 0-I PD (73.3% versus 48.8% in males), and females had a shorter duration of DM (p< 0.005).

Adequate metabolic control was significantly more common for female patients, while males had a higher risk for the presence of factors causing PD. This deficiency in males could be related to differences in attitude, where females show greater compliance with the treatment plan. Moreover, males with poorly controlled diabetes can experience many complications; more than half of them need support from the family in addition to institutions to control and treat their diabetes. Another factor that could influence diabetes control is that the population in this study visited a public hospital; patients with higher purchasing power can visit private institutions, so socioeconomic status may be another factor that can influence patients who did not achieve good metabolic control and received subpar treatment for the disease.


In the present study, the prevalence of PD was found to be associated with poorly controlled diabetes. The treatment of periodontitis is essential in diabetic patients because an effective treatment of PD improves blood glucose levels; thus, it is suggested that efforts should be made to prevent the onset of PD.

In the multidisciplinary management of these patients, specialist doctors should take the participation of the stomatologist into account since infections in diabetic patients make hyperglycemia worse. This type of hyperglycemia can only be controlled if, in addition to diet, insulin and ancillary treatment, PD is prevented and treated.

Some limitations of the present study should be considered. This study was cross-sectional. The socioeconomic level was not analyzed despite reports indicating that this factor influences the outcome of disease control and suggesting that populations with a higher socioeconomic level can more easily access information on disease control, better understand instructions regarding treatment and develop more self-care skills. These results are valid for the studied population but cannot be extrapolated to the entire Mexican population.

Apart from these limitations, the results may be relevant because of the use of a large population of type I diabetic patients. These findings, which have revealed the needs of this population, can be useful for identifying and thus designing promotion and follow-up strategies; the results may serve as a basis for future follow-up or intervention studies of adolescents.


We thank the authorities of the Institution, the patients and their relatives for the collaboration necessary to conduct this study as well as the physicians who supported the collaboration, thus allowing this study to be performed.

Conflict of Interest

All authors disclose that there was no conflict of interest.


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