CC BY 4.0 · Eur J Dent 2023; 17(03): 784-789
DOI: 10.1055/s-0042-1755553
Original Article

Oral Manifestations: A Reliable Indicator for Undiagnosed Diabetes Mellitus Patients

1   Department of Oral Biology, Lahore Medical and Dental College, Lahore, Pakistan
,
2   Department of Oral Pathology, Rashid Latif Dental College/Rashid Latif Medical Complex, Lahore, Pakistan
,
3   Department of Operative Dentistry, Rashid Latif Dental College/Rashid Latif Medical Complex, Lahore, Pakistan
,
4   Department of Oral & Maxillofacial Surgery, Rashid Latif Dental College/Rashid Latif Medical Complex, Lahore, Pakistan
,
5   Department of Community Dentistry, Rashid Latif Dental College/Rashid Latif Medical Complex, Lahore, Pakistan
,
2   Department of Oral Pathology, Rashid Latif Dental College/Rashid Latif Medical Complex, Lahore, Pakistan
› Author Affiliations
Funding None.
 

Abstract

Objectives This article identifies undiagnosed DM (UDM) cases in the Pakistani population by perceiving the signs and symptoms of DM and associating them with oral manifestations.

Material and Methods In this cross-sectional study, patients showing at least three or more classical or warning signs like polydipsia, polyuria, polyphagia, and general weakness were considered UDM cases. Detailed oral examination for gingivitis, periodontitis, halitosis, xerostomia, and tongue manifestations was done followed by the hemoglobin A1c (HbA1c) analysis.

Results Out of 5,878 patients, 214 UDM cases were identified, where 31.8% and 39.7% of the patients were diagnosed as prediabetics and diabetics, respectively, based on HbA1c analysis. Prevalence of gingivitis (97.6%), fissured tongue (91.8%), generalized periodontitis (85.9%), thick saliva (87.1%), xerostomia (84.7%), burning mouth syndrome (63.5%), yellow discoloration of tongue (57.6%), and ecchymosis/ulcers (43.5%) were more in diabetics as compared to prediabetic patients and normal population.

Conclusion The oral manifestations can be crucial for identifying UDM cases. Dentists can play a pivotal role by taking detailed history and thorough oral examination. If three or more symptoms as concluded above are present, an HbA1c analysis should be conducted to prevent preop and postop complications associated with DM.


#

Introduction

Diabetes mellitus (DM) is a growing public health concern worldwide.[1] [2] It can have profound long-term implications on the lives and well-being of individuals, families, and society.[1] It is a chronic metabolic disorder, and it is of two types: type 1 (also known as insulin-dependent) and type 2 (also known as noninsulin-dependent).[3] Type 2 DM represents approximately 95% of diabetic cases.[4]

DM affects all age groups but is more common in adults. According to the International Diabetes Federation, globally, its prevalence has increased dramatically over the past few years, and it is expected to increase threefold in the next decade.[1] It is also estimated that 49.7% of people living with type 2 diabetes are undiagnosed.[5] In Pakistan, the prevalence of type 2 DM is approximately 16.98%, whereas the prevalence of prediabetes is 10.91%.[6] [7] According to literature, around two-thirds of prediabetes tend to manifest DM in 3 years' time span.[8] [9] A delay of 2 to 7 years has been estimated by studies between onset of diabetes myelitis and its definitive diagnosis.[10]

The common risk factors for type 2 DM include family history of diabetes, age greater than 35 years, obesity, hypertension, sedentary lifestyle, and gestational diabetes.[4] However, people and doctors should be well aware of classical or warning symptoms like unexplained weight loss, polydipsia, polyuria, polyphagia, fatigue, irritability, dry mouth, and burning pain or numbness of feet.[4] DM ultimately leads to comorbid symptoms like microvascular (nephropathy, neuropathy, retinopathy) or macrovascular (cardiovascular and cerebrovascular) manifestations.[11] Several conditions that deter oral health have also been associated with DM, namely periodontal problems, xerostomia, halitosis, fungal infections, caries, neurosensory dysesthesia, and oral mucosal lesions (like angular cheilitis, stomatitis, geographic, and fissured tongue).[3] [12] [13] [14]

DM is directly or indirectly associated with cardiovascular and cerebrovascular or infectious diseases. It has a high mortality rate and is considered to be one of the leading causes of death worldwide.[15] It is estimated that one in two people with DM are unaware of their health status.[1] This is because often, diabetes has a latent, asymptomatic phase of subclinical stage that goes undiagnosed for several years.[15] This applies to Pakistan as well; a comprehensive overview of the Pakistani health care system suggests a high burden of undiagnosed DM (UDM) cases, approximately 1 in 8,487, which estimates to be 3 million.[1] [16] If the current trend of UDM continues then, Pakistan is likely to achieve the highest prevalence of DM worldwide.[17] In many UDM patients, vascular complications are already present, and they are unaware of these complications.[5] All these factors can play an adverse role in planning their dental treatment as most dental practitioners depend only on the history given by the patients[16] [18] because such patients during dental treatment are more prone to develop hypoglycemia and require comprehensive management of oro-dental infections.[19]

Individuals with DM are more vulnerable to develop oral manifestations.[8] [19] [20] Thus, the present study was conducted to identify UDM cases in the Pakistani population by perceiving the signs and symptoms of DM and associating these symptoms with oral manifestations. Dentists can play an active role in identifying and reducing the associated morbidity and mortality with UDM by evaluating their patients' oral health so that such patients can be timely referred to physicians for definitive diagnosis.


#

Material and Methods

The present cross-sectional study was conducted on the Pakistani population at tertiary care hospital setting, from October 1, 2020 to April 1, 2021. Ethical approval was obtained from the ethical review committee of hospital with IRB no: 2520. A total of 5,878 patients presented to the outpatient department, the study included both genders, with age ranging from 25 to 75 years. All those patients who gave a history of classical or warning signs like polydipsia, polyuria, polyphagia,[4] and general weakness were included in the study.

Apart from these classical signs, history was also taken about unexplained weight loss, tingling sensation, and numbness of hands and feet. Unintentional loss of more than 5% of normal body weight, or more than 10 lbs (4.5 kg) in 6 to 12 months or less was considered as unexplained weight loss. Whereas, presence of unusual prickling sensations in the lower limbs as sharp, stabbing, lancinating, or electric shock like, was considered as numbness and tingling in the extremities.

Risk factors such as obesity and family history of DM were also taken into consideration. Known DM patients, immunocompromised, and mentally or physically disabled patients were excluded from the study.

Informed consent was taken before history taking and oral examination. Patients with a history of three or more classical DM signs were assumed as UDM patients and were referred for clinical oral examination and hemoglobin A1c (HbA1c) analysis. Clinical examination was performed using sterile examination gloves, mouth mirror, periodontal probe, sterile gauze, and wooden tongue depressor under dental unit light.

Parameters for evaluating oral manifestations were:

  • Gingivitis – the presence of bleeding on probing.

  • Periodontitis – clinical attachment loss:

    • Stage I: 1–2 mm

    • Stage II: 3–4 mm

    • Stage III: ≤ 5 mm

    • Stage IV: ≥ 5 mm

    • o Localized (less than 30% sites involving incisors and first molar only) ([Fig. 1A]).

    • o Generalized (more than 30% with three teeth other than incisors and first molars involved) ([Fig. 1B]).[21]

  • Halitosis – evaluated through the history of bad breath.

  • Xerostomia – evaluated when dental mirror was sticking to the tongue or buccal mucosa (either no saliva pooling or thick ropy saliva) and burning mouth syndrome (BMS).

  • Tongue manifestations assessed were fissured tongue, presence of ulcerations, and color of tongue coating (white, pale yellow, or yellow) ([Fig. 1C] and [D]).

Zoom Image
Fig. 1 Clinical pictures of patients with (A) localized periodontitis, (B) generalized periodontitis, (C) fissured tongue, and (D) yellow tongue coating along with fissured tongue.

Assessing the Blood Glucose Levels

According to the American Diabetic Association (ADA), HbA1c is a reliable diagnostic test for diabetes and prediabetes.[22] [23] HbA1c is a blood test that measures the average blood sugar (glucose) attached to hemoglobin over the past 3 months.[22] A high HbA1c level is indicative of diabetes.[22] Thus, interpretation of HbA1c levels was made according to the ADA guidelines; subjects with HbA1c levels within the range of 4.0 to 5.6% were nondiabetic patients (regular patients), those between 5.7 and 6.4% were prediabetic. In contrast, those with HbA1c levels greater than 6.5% were diagnosed as diabetic patients.[23] [24]


#

Data Analysis

The data was entered and analyzed using the Statistical Package of Social Sciences (SPSS) version 24.0. Mean and standard were calculated for quantitative variables like age and HbA1c. Chi-square test was used to explore the significant association between diabetic status and classical signs, including oral manifestations. A p-value of ≤ 0.05 was considered significant.


#
#

Results

Out of 5,878 patients, 214 (3.6%) patients were identified as UDM who gave history of three or more classical signs of DM ([Fig. 2]). These patients were proceeded for oral examination and HbA1c analysis. According to the ADA criteria, out of these 214 UDM patients, 28.5% (n = 61) were nondiabetic, 31.8% (n = 68) patients were found to be prediabetic, and 39.7% (n = 85) were identified as diabetic patients ([Fig. 2]).

Zoom Image
Fig. 2 Flowchart of the study protocol.

The mean age of participants was almost 50 ± 8 years, and the mean value of HbA1c was 6.6 with a standard deviation of 1.45. [Table 1] shows that the mean age of nondiabetic and prediabetic participants was similar (47 ± 5 years), whereas the mean age of diabetic patients was 54 ± 9 years. The mean value of HbA1c among nondiabetic, prediabetic, and diabetic participants was 5.23 ± 0.20, 6.00 ± 0.21, and 8.01 ± 1.25, respectively ([Table 1]).

Table 1

Description of age and HbA1c by classification of diabetic status

Diabetic status

Variable name

N

Minimum

Maximum

Mean

Standard deviation

Nondiabetic

Age

61

39

61

47.07

5.205

Prediabetic

68

37

61

47.12

5.307

Diabetic

85

38

88

54.29

9.396

Nondiabetic

HbA1c

61

4.80

5.60

5.2344

.20321

Prediabetic

68

5.70

6.40

6.0015

.21682

Diabetic

85

6.50

11.00

8.0153

1.25247

Classical diabetic signs were slightly more prevalent in female participants; however, the results revealed insignificant p-value for both genders, showing that they had the same chances to develop DM ([Table 2]).

Table 2

Association of classical signs of diabetes mellitus and diabetic status

Variable name

Category name

Frequency (%)

Diabetic status

p-Value

Nondiabetic

Prediabetic

Diabetic

Gender

Male

N (%)

30 (49.2)

30 (44.1)

41 (48.8)

0.803

Female

N (%)

31 (50.8)

38 (55.9)

43 (51.2)

Polydipsia

No

N (%)

0

0

0

0.000

Yes

N (%)

61 (100)

68 (100)

85 (100)

Polyurea

No

N (%)

0

0

0

0.000

Yes

N (%)

61 (100)

68 (100)

85 (100)

Polyphagia

No

N (%)

49 (80.3)

0

0

0.000

Yes

N (%)

12 (19.7)

68 (100)

85 (100)

Numbness

No

N (%)

61 (100)

66 (97.1)

0

0.000

Yes

N (%)

0

2 (2.9)

85 (100)

Unexplained weight loss

No

N (%)

31 (50.8)

7 (10.3)

0

0.000

Yes

N (%)

30 (49.2)

61 (89.7)

85 (100)

All 214 patients gave a history of polydipsia and polyuria; however, polyphagia was predominant among prediabetic and diabetic patients ([Table 2]). Most diabetic patients suffered from numbness and tingling in their extremities, compared with prediabetic and nondiabetic patients ([Table 2]). A significant number of prediabetic and diabetic participants had a history of more than 10 lbs (4.5 kg) of unexplained weight loss in 6 to 12 months compared with nondiabetic patients ([Table 2]).

The percentage of oral manifestations recorded in UDM patients is depicted in [Table 3], where generalized periodontitis, xerostomia, and BMS, with yellow discoloration of tongue were dominant in diabetics compared with normal and prediabetic patients.

Table 3

Association of oral manifestations of diabetes mellitus and diabetic status

Variable name

Category name

Frequency (%)

Diabetic status

p-Value

Nondiabetic

Prediabetic

Diabetic

Halitosis

No

N (%)

53 (86.9)

8 (11.8)

2 (2.4)

0.000

Yes

N (%)

8 (13.1)

60 (88.2)

83 (97.6)

Gingivitis

No

N (%)

40 (65.5)

8 (11.8)

2 (2.4)

0.000

Yes

N (%)

21 (34.4)

60 (88.2)

83 (97.6)

Localized periodontitis

No

N (%)

53 (86.9)

13 (19.1)

74 (87.1)

0.000

Yes

N (%)

8 (13.1)

55 (80.9)

11 (12.9)

Generalized periodontitis

No

N (%)

56 (91.8)

56 (82.4)

12 (14.1)

0.000

Yes

N (%)

5 (8.2)

12 (17.6)

73 (85.9)

H/O dry mouth

No

N (%)

61 (100)

57 (83.8)

13 (15.3)

0.000

Yes

N (%)

0

11 (16.2)

72 (84.7)

Burning mouth syndrome

No

N (%)

61 (100)

61 (89.7)

31 (36.5)

0.000

Yes

N (%)

0

7 (10.3)

54 (63.5)

Tongue color

White

N (%)

58 (95.1)

52 (76.5)

11 (12.9)

0.000

Pale Yellow

N (%)

3 (4.9)

12 (17.6)

25 (29.4)

Yellow

N (%)

0

4 (5.9)

49 (57.6)

Tongue fissure

No

N (%)

61 (100)

63 (92.6)

7 (8.2)

0.000

Yes

N (%)

0

5 (7.4)

78 (91.8)

Ecchymosis/Ulcers

No

N (%)

61 (100)

62 (91.2)

48 (56.5)

0.000

Yes

N (%)

0

6 (8.8)

37 (43.5)

Consistency of saliva

Thick ropy

N (%)

3 (4.9)

12 (17.6)

74 (87.1)

0.000

Thin

N (%)

58 (95.1)

56 (82.4)

11 (12.9)

Other tongue manifestations like fissured tongue and ecchymosis/ulcers with thick saliva (stringy or rope-like) were observed more in diabetic patients than prediabetic and nondiabetic participants ([Table 3]).


#

Discussion

The prevalence of type 2 diabetes and prediabetes has been increasing rapidly in developing countries, particularly in Pakistan.[1] [7] [25] Comprehensive strategies regarding awareness of warning signs, timely diagnosis, and treatment planning of DM are lacking.[6] [7] [17]

Type 2 DM which accounts for 85 to 95% of all diabetes, has a latent, asymptomatic period of subclinical stages which often remain undiagnosed for several years.[1] During this period of undiagnosed disease, risk factors for diabetic micro- and macrovascular complications are markedly elevated in the background of diabetic disease progression. Thus, in many Asian patients, warning signs and vascular complications are already present at the time of diagnosis of diabetes.[4] Accordingly, it was observed in our study, that among the 214 UDM cases, 71.5% participants were prediabetic and diabetic. The prevalence of UDM was almost the same in both genders; however, previous demographic data shows that old-aged females are most likely to be affected by DM.[7] [13] [24]

According to literature, patients with DM are more prone to develop oral manifestations,[8] [19] [20] and are more susceptible to develop periodontal diseases.[26] Consequently, in the current study, majority of the patients with higher HbA1c levels showed generalized periodontitis. These findings are in accordance with earlier studies[27] [28] showing that people with type 2 DM are three times more likely to develop periodontal diseases than people without DM.[27] [28] This is due to the fact that status of periodontal disease in uncontrolled diabetic patients is influenced by glycemic control, increased production of advanced glycated end-products, and poor glycemic control cause oxidative stress to the gingiva, which in turn lead to periodontal disease.[29] [30]

The risk of halitosis (bad breath) increases with elevated levels of HbA1c[31] In the present study, around 88% of prediabetic and 97% of diabetic patients presented with halitosis which is in accordance with studies done by Choi and Al-Zahrani et al showing a strong association between halitosis and elevated levels of HbA1c.[31] [32]

Xerostomia is regarded as one of the most prevalent signs of DM.[13] In the present study, xerostomia was the fifth most common oral manifestation (after gingivitis, periodontitis, halitosis, and fissure tongue), conforming with literature.[2] [3] [13] [20] The presence of thick ropy saliva is also a common feature with higher HbA1c levels; in our study, 87% of diabetic people presented with thick ropy saliva, which is in line with work done by Al-Maskari et al and Chávez et al.[3] [33] Xerostomia causes dryness which disturbs the delicate lining of oral mucosa leading to BMS.[3] [34] Our study data showed that around 63% of the participants had BMS, which corresponds with Gurvits and Tan.[35] Prevalence of BMS was lesser in diabetic and prediabetic patients probably because it has multifactorial etiologies other than poor glycemic control, such as chronic stress disorder, dietary and prosthesis allergies, angiopathy, candidiasis, and regional neuropathy.[34] [36]

Oral cavity mirrors the general health status of a person and supports the relationship between oral health and DM, hence examination of the tongue plays a vital role in the identification and prognosis of DM.[20] In the present study, the tongue manifestations taken into consideration were fissured tongue, ulceration, and color of tongue coating. Fissures develop on the dorsal surface of the tongue due to inadequate glycemic control, immunological changes, alteration in microcirculation, and salivary flow.[34] [37] Manifestations like fissure tongue were prevalent in patients with higher HbA1c levels, accounting to 91% of diabetic patients. The findings of our study are consistent with the results of the study done on the Japanese population by Hsu et al.[20]

Furthermore, in the current study, there was a greater prevalence of both yellow (57.6%) and pale yellow (29.4%) tongue coatings in patients having high levels of HbA1c. Similar findings regarding tongue coatings are observed by Tomooka et al in prediabetic and diabetic Japanese patients.[20] [38] However, the prevalence of ulceration on the tongue was relatively lower (around 44%) in diabetic patients, which is in accordance with previous studies.[20] [39]


#

Conclusion

Our study identified all UDM patients, on the basis of history and oral examination, further confirmed by HbA1c, and were categorized as prediabetics and diabetics based on HbA1c levels. Overall, these diabetic patients had poor glycemic control since they were unaware of their medical condition, and were neither taking hypoglycemics nor were on dietary restrictions. The results of the current study reveal that fissure tongue, halitosis, generalized periodontitis, tongue coatings, thick ropy saliva, and xerostomia were more prevalent in UDM due to poor glycemic control as compared with nondiabetics. These oral signs and symptoms can be crucial for identifying UDM cases. Dentists can play an essential role by performing thorough oral examination. If three or more symptoms as concluded above are present, an HbA1c test should be conducted. Moreover, extra precautions should be considered, especially during invasive procedures. They should strictly adhere to aseptic techniques, minimize iatrogenic tissue injury, and access the need for prophylactic antibiotics to avoid postoperative infections.


#

Limitations

Sample size was limited, large-scale studies should carried out. Further, such studies should be conducted on different populations to validate the findings.


#

Future Recommendations

Practice of conducting HbA1c tests should be implemented in all patients identified with three or more established oral manifestations. All private and government dental institutes throughout the country should focus on diabetic awareness programs, which will help save millions from morbidity and mortality secondary to DM.


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Conflict of Interest

None declared.

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Address for correspondence

Farhat Kazmi, BDS, MPhil, PhD
Department of Oral Pathology, Rashid Latif Dental College/Rashid Latif Medical Complex
Lahore
Pakistan   

Publication History

Article published online:
11 October 2022

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  • References

  • 1 Saeedi P, Petersohn I, Salpea P. et al; IDF Diabetes Atlas Committee. Global and regional diabetes prevalence estimates for 2019 and projections for 2030 and 2045: results from the International Diabetes Federation Diabetes Atlas, 9th edition. Diabetes Res Clin Pract 2019; 157: 107843
  • 2 Ali Hassan S, Pratyusha F. Diabetes and oral diseases- a review. IP J Nutr Metab Heal Sci. 2020; 3 (01) 6-9
  • 3 Al-Maskari AY, Al-Maskari MY, Al-Sudairy S. Oral manifestations and complications of diabetes mellitus: a review. Sultan Qaboos Univ Med J 2011; 11 (02) 179-186
  • 4 Ramachandran A. Know the signs and symptoms of diabetes. Indian J Med Res 2014; 140 (05) 579-581
  • 5 Akhtar S, Nasir JA, Abbas T, Sarwar A. Diabetes in Pakistan: a systematic review and meta-analysis. Pak J Med Sci 2019; 35 (04) 1173-1178
  • 6 Ijaz M, Ali I, Hussain A. Diabetes mellitus in Pakistan: the past, present, and future. Int J Diabetes Dev Ctries 2020; 40 (01) 153-154
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Fig. 1 Clinical pictures of patients with (A) localized periodontitis, (B) generalized periodontitis, (C) fissured tongue, and (D) yellow tongue coating along with fissured tongue.
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Fig. 2 Flowchart of the study protocol.