Prevalence Of Endo Perio Lesion - An Institutional Study
Prashaanthi. N1, Arvina Rajasekar2*, Shantha Sundari. K.K3
1 Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai - 600 077, India.
2 Senior Lecturer, Department of Periodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai - 600 077, India.
3 Professor, Department of Orthodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai - 600 077, India.
*Corresponding Author
Arvina Rajasekar,
Senior Lecturer, Department of Periodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai
- 600 077, India.
Tel: 9486442309
E-mail: arvinar.sdc@saveetha.com
Received: May 08, 2021; Accepted: June 16, 2021; Published: June 25, 2021
Citation: Prashaanthi. N, Arvina Rajasekar, Shantha Sundari. K.K Prevalence Of Endo Perio Lesion - An Institutional Study. Int J Dentistry Oral Sci. 2021;8(6):2858-2862.doi: dx.doi.org/10.19070/2377-8075-21000580
Copyright: Arvina Rajasekar©2021. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.
Abstract
The interrelationship between endodontic and periodontal disease has been a subject of confusion and controversy for many years. Pulpal and periodontal problems are responsible for more than 50% of tooth mortality rate. The aim of the study was to evaluate the prevalence of endo-perio lesions among patients in an institution. This retrospective study included patients who were diagnosed with endo perio lesion from June 2019 to March 2020 in a private institution. Variables such as age, gender and the site of endo perio lesion were retrieved from the patient’s records. Data was tabulated and was statistically subjected to IBM SPSS version 23 and results were obtained. Descriptive and inferential statistics were done. In our study, out of 150 patients, 17.3% of the patients had endo perio lesion. There were 12.7% males and 4.7% females. On analysing the age and the prevalence of endo perio lesion, the higher prevalence was seen among 31-40 years age groups (5.3%). Also, there was statistically significant association between age and the endo perio lesion while there was no statistically significant association between gender and the endo perio lesion. The present study showed that 17.3% of the study population had endo perio lesion. Also, prevalence of endo perio lesion was higher among males (12.7%) and among the age group of 31-40 years (5.3%).
2.Introduction
6.Conclusion
8.References
Keywords
Endo Perio Lesion; Periapical Abscess; Periodontal Abscess; Periodontitis.
Introduction
Periodontitis is a chronic inflammatory process which leads to
destruction of the tooth, surrounding periodontium and the alveolar
bone [1-3]. There are various inflammatory mediators such
as cytokines and vasoactive peptides which mediate the inflammatory
process and lead to periodontal destruction [3-10]. The periodontitis
is diagnosed by clinical and radiological examination and
can be classified into various types [11]. The treatment depends
on the etiology , extent and severity of the periodontal disease
and can be treated either by a non surgical [12-14] or surgical
management [15-18].
Endodontium deals with the caries involvement where there is
dissolution of inorganic substances and destruction of organic
matter. When the caries are not treated for a longer period of time
, they may end up involving the pulp [19, 20]. Eventually there will
be pulpal necrosis which progresses gradually into a periapical lesion.
The diagnosis and treatment differs depending on the type
of pulpal response and the severity of the lesion [19].
The endodontium and periodontium are closely related and disease
of one tissue may lead to the involvement of endodontic and
periodontal diseases. It can be difficult as it is important to make
a correct diagnosis so that appropriate treatment can be provided
[21-23].
Simring and Goldberg in 1964 were the first to describe the relationship
between periodontal and pulpal disease [24]. Since then
the term endo-perio lesion has been used to describe lesions due
to inflammatory products found in varying degrees in both periodontal
and pulpal tissue [25, 26].
The term endo-perio lesion describes the etiopathogenesis which
includes lesions caused by endodontic pathogens that have spread
coronally, involving the gingival margin or by creating a fistula, or
sinus tract. The infection can also spread through the marginal
lesions and involve the apical periodontal tissues.The pulp and
the periodontium are distinct from one another, but they are anatomically
connected via foramina. An apical lesion of endodontic
origin or persisting attachment and bone loss in the alveolar crest
area or resulting from a combination of the above is a crucial part
of the differential diagnosis [26].
These lesions often present as challenges to the clinician for diagnosis
and prognosis of the involved teeth [22, 27]. The possible
connection between chronic oral inflammatory processes such as
apical periodontitis and periodontal disease and systemic health
may have an influence on the disease process [28].
Because chronic endo-perio lesions are common in clinical practice,
a number of authors have already addressed this issue [1,
3-9]. The prevalence of endo-perio lesion was studied among European
population and also its relationship with Type II Diabetes
Mellitus [22, 27]. Previously our team has a rich experience in
working on various research projects across multiple disciplines
The [29-43]. Hence, our study was to evaluate the prevalence of
endo-perio lesion.
Materials And Methods
This retrospective cross-sectional study was conducted to evaluate
the prevalence of endo perio lesions among patients in a
private institution, Chennai from June 2019 to March 2020. The
study was initiated after approval from the Institutional Ethical
review board. Ethical approval number was SDC/SIHEC/2020/
DIASDATA/0619-0320. A total of 150 patients were randomly
recruited and data regarding age, gender, oral examination were
collected from the patient’s case records.
The collected data was validated, tabulated and analysed with Statistical
Package for Social Sciences for Windows, SPSS version
23 and results were obtained. Descriptive (Frequency distribution
and percentage) and Inferential (chi square test) statistics were
done.
Results And Discussion
In our study, out of 150 patients, 17.3% of them presented with
endo-perio lesion. The study population was divided into different
age groups as: 21-30 years, 31-40 years, 41-50 years, 51-60
years and 61-70 years. 6 patients (4%) among 21-30 years , 8 patients
(5.3%) among 31-40 years , 6 patients (4%) among 41-50
years , 4 patients (2.7%) among 51-60 years , 2 patients (1.3%)
among 61-70 years presented with endo perio lesion. The endo
perio lesion was more prevalent among 31-40 years (5.3%) and
least prevalent among 61-70 years (1.3%). [Table 1].
Among 150 patients, 96 patients (64%) were males and 54 patients
(36%) were females. On analysing 26 patients with endo
perio lesion, 19 patients (12.7%) were males and 7 patients (4.7%)
were females. [Table 2].
The association between different age groups and endo perio lesion
was assessed using chi square test and was found to be statistically
significant with the p value of 0.000. [ Figure 1] Also, the
association between gender and endo perio lesion was assessed
using chi square test and was found to be statistically not significant
with the p value of 0.289. [Figure 2]
The present retrospective study assessed the prevalence of endo
perio lesion. Among 150 patients, 26 patients (17.3%) presented
with endo perio lesion. Study done by Issac et al assessed the
prevalence of endo perio lesion among Type II diabetic patients
and found that there was 18% prevalence of endo perio lesion.
[44] Study by Grudianov et al showed 17.78% of prevalence of endo perio lesion. [45] Emrich et al suggested that there was an
increased risk for progressive periodontal destruction in patients
with periapical lesions. [46] Our findings are in accordance with
the previous studies.
In the present study, prevalence of endo perio lesion was more
common among 31-40 years and was least common among 61-70
years. Study done by Kavathapu et al assessed the management
of endo perio lesion in patients with aggressive periodontitis and
there was a higher prevalence of endo-perio lesion among 31-
40 years [47]. Study done by Viswanath et al suggested different
treatment modalities for managing endo perio lesion and found
that there was higher prevalence of endo perio lesion among 31-
40 years [48]. Our findings are in accordance with the previous
studies.Our institution is passionate about high quality evidence
based research and has excelled in various fields [49-59].
In the present study, males had higher prevalence of endo perio
lesion than females. Study by Grudianov et al showed gender prediction
of males reporting with endo-perio lesion. Studies done
by Eke et al and Dye et al showed that periodontitis had a higher
prevalence in men than women [60]. Anerud et al and Loe et al
studied the natural history of periodontal diseases and found that
there was association between periodontitis and gender, suggesting
a male predilection [61, 62]. Our findings are in accordance
with the previous studies.
The present study showed that 17.3% of the study population
had endo perio lesion. Also, prevalence of endo perio lesion was
higher among males (12.7%) and among the age group of 31-40
years (5.3%). However , the results cannot be generalised because
of the limited sample size. Therefore, multicenter studies among
larger populations need to be conducted to assess the prevalence
of endo perio lesion and the other factors associated with endo
perio lesion.
Table 1. Table showing distribution of study participants based on different age groups. The endo perio lesion were in higher prevalence among 31-40 years (5.3%) and least among 61-70 years (1.3%).
Table 2. Table showing distribution of study participants based on gender. Males (12.7%) had higher prevalence of endo perio lesion than females (4.7%).
Figure 1. Bar graph shows the association between different age groups and endo perio lesion. X axis represents different age groups and Y axis represents percentage distribution of patients with (blue) and without (green) endo perio lesion. The endo perio lesion was more prevalent among 31-40 years (5.3%) and least prevalent among 61-70 years (1.3%). The association between different age groups and endo perio lesion prevalence was statistically significant. (Chi-square test; p=0.000).
Figure 2. Bar graph shows the association between gender and endo perio lesion. X axis represents gender and Y axis represents percentage distribution of patients with (blue) and without (green) endo perio lesion. The endo perio lesion was more prevalent among males (12.67%) than females (4.67%).The association between gender and endo perio lesion prevalence was statistically not significant. (Chi-square test; p=0.289).
Conclusion
Within the limitations of the present study, it can be concluded
that 17.3% of the study population had endo perio lesion. Also,
prevalence of endo perio lesion was higher among males (12.7%)
and among the age group of 31-40 years (5.3%).
Authors Contribution
Prashaanthi.N contributed acquisition of data, analysis, literature
collection and also in drafting the article and revising it critically
for important intellectual content. Arvina Rajasekar contributed
in conception, the study design, interpretation of data, formatting,
manuscript preparation, supervision and guidance. Shantha
sundari.K.K contributed in editing, supervision and final approval
of the submitted version of the manuscript. All the authors had
equally contributed in developing the manuscript.
Acknowledgement
The authors of this study would like to express their gratitude
towards everyone who facilitated and enabled us to carry out this
study successfully. We would also thank the institute for helping
us to have access to all the case records for collecting the required
cases for conducting this study.
References
- Ramesh A, Varghese SS, Jayakumar ND, Malaiappan S. Chronic obstructive pulmonary disease and periodontitis–unwinding their linking mechanisms. J Oral Biosci . 2016 Feb 1;58(1):23-6.
- Ramesh A, Ravi S, Kaarthikeyan G. Comprehensive rehabilitation using dental implants in generalized aggressive periodontitis. J Indian Soc Periodontol. 2017 Mar;21(2):160-3.
- Colombo AP, Boches SK, Cotton SL, Goodson JM, Kent R, Haffajee AD, et al. Comparisons of subgingival microbial profiles of refractory periodontitis, severe periodontitis, and periodontal health using the human oral microbe identification microarray. J Periodontol. 2009 Sep;80(9):1421-32.Pubmed PMID: 19722792.
- Varghese SS, Thomas H, Jayakumar ND, Sankari M, Lakshmanan R. Estimation of salivary tumor necrosis factor-alpha in chronic and aggressive periodontitis patients. Contemp Clin Dent. 2015 Sep;6(Suppl 1):S152-6. Pubmed PMID: 26604566.
- Avinash K, Malaippan S, Dooraiswamy JN. Methods of Isolation and Characterization of Stem Cells from Different Regions of Oral Cavity Using Markers: A Systematic Review. Int J Stem Cells. 2017 May 30;10(1):12-20. Pubmed PMID: 28531913.
- Mootha A, Malaiappan S, Jayakumar ND, Varghese SS, Toby Thomas J. The Effect of Periodontitis on Expression of Interleukin-21: A Systematic Review. Int J Inflam. 2016;2016:3507503.Pubmed PMID: 26998377.
- Khalid W, Vargheese SS, Lakshmanan R, Sankari M, Jayakumar ND. Role of endothelin-1 in periodontal diseases: A structured review. Indian J Dent Res. 2016 May-Jun;27(3):323-33.Pubmed PMID: 27411664.
- Khalid W, Varghese SS, Sankari M, Jayakumar ND. Comparison of Serum Levels of Endothelin-1 in Chronic Periodontitis Patients Before and After Treatment. J Clin Diagn Res. 2017 Apr;11(4):ZC78-ZC81.Pubmed PMID: 28571268.
- Priyanka S, Kaarthikeyan G, Nadathur JD, Mohanraj A, Kavarthapu A. Detection of cytomegalovirus, Epstein-Barr virus, and Torque Teno virus in subgingival and atheromatous plaques of cardiac patients with chronic periodontitis. J Indian Soc Periodontol. 2017 Nov-Dec;21(6):456-460.Pubmed PMID: 29551863.
- Page RC, Kornman KS. The pathogenesis of human periodontitis: an introduction. Periodontol 2000. 1997 Jun;14(1):9-11.
- Kavarthapu A, Thamaraiselvan M. Assessing the variation in course and position of inferior alveolar nerve among south Indian population: A cone beam computed tomographic study. Indian J Dent Res. 2018 Jul- Aug;29(4):405-409.Pubmed PMID: 30127186.
- Ramesh A, Varghese SS, Doraiswamy JN, Malaiappan S. Herbs as an antioxidant arsenal for periodontal diseases. J Intercult Ethnopharmacol. 2016 Jan 27;5(1):92-6.Pubmed PMID: 27069730.
- Ramamurthy JA, Mg V. Comparison of effect of hiora mouthwash versus chlorhexidine mouthwash in gingivitis patients: a clinical trial. Asian Asian J Pharm Clin Res. 2018;11(7):84-8.
- Van Dyke TE, Dave S. Risk factors for periodontitis. J Int Acad Periodontol. 2005 Jan;7(1):3-7.
- Thamaraiselvan M, Elavarasu S, Thangakumaran S, Gadagi JS, Arthie T. Comparative clinical evaluation of coronally advanced flap with or without platelet rich fibrin membrane in the treatment of isolated gingival recession. J Indian Soc Periodontol. 2015 Jan;19(1):66-71.
- Ravi S, Malaiappan S, Varghese S, Jayakumar ND, Prakasam G. Additive Effect of Plasma Rich in Growth Factors With Guided Tissue Regeneration in Treatment of Intrabony Defects in Patients With Chronic Periodontitis: A Split-Mouth Randomized Controlled Clinical Trial. J Periodontol. 2017 Sep;88(9):839-845.Pubmed PMID: 28474968.
- Ramesh A, Vellayappan R, Ravi S, Gurumoorthy K. Esthetic lip repositioning: A cosmetic approach for correction of gummy smile - A case series. J Indian Soc Periodontol. 2019 May-Jun;23(3):290-294.Pubmed PMID: 31143013.
- Panda S, Jayakumar ND, Sankari M, Varghese SS, Kumar DS. Platelet rich fibrin and xenograft in treatment of intrabony defect. Contemp Clin Dent. 2014 Oct;5(4):550-4.
- Bjørndal L. The caries process and its effect on the pulp: the science is changing and so is our understanding. Pediatr Dent. 2008 May 1;30(3):192-6.
- Usha C, Sathyanarayanan R. Dental caries-A complete changeover (Part I). J Conserv Dent. 2009 Apr;12(2):46-54.
- Parolia A, Gait TC, Porto IC, Mala K. Endo-perio lesion: A dilemma from 19 th until 21 st century. J. Interdiscip. Dent. 2013 Jan 1;3(1):2.
- Segura-Egea JJ, Castellanos-Cosano L, Machuca G, López-López J, Martín- González J, Velasco-Ortega E, et al. Diabetes mellitus, periapical inflammation and endodontic treatment outcome. Med Oral Patol Oral Cir Bucal. 2012 Mar;17(2):e356-61.
- Simon JH, Glick DH, Frank AL. The relationship of endodontic-periodontic lesions. J Periodontol. 1972 Apr;43(4):202-8.
- Simring M, Goldberg M. The pulpal pocket approach: retrograde periodontitis. J. Periodontol. 1964 Jan;35(1):22-48.
- Paul A.. Rosenberg. Endodontic Pain: Diagnosis, Causes, Prevention and Treatment. Springer.; 2014:183.
- Foce E, Castellucci A, Carnevale G. Endo-periodontal lesions. Quintessence Pub.; 2011.
- Ueta E, Osaki T, Yoneda K, Yamamoto T. Prevalence of diabetes mellitus in odontogenic infections and oral candidiasis: an analysis of neutrophil suppression. J Oral Pathol Med. 1993 Apr;22(4):168-74.Pubmed PMID: 8391079.
- Wang HL, Burgett FG, Shyr Y. The relationship between restoration and furcation involvement on molar teeth. J Periodontol. 1993 Apr;64(4):302-5.
- Hafeez N. Accessory foramen in the middle cranial fossa. Res J Pharm Technol. 2016 Nov 1;9(11):1880.
- Krishnan RP, Ramani P, Sherlin HJ, Sukumaran G, Ramasubramanian A, Jayaraj G, et al. Surgical Specimen Handover from Operation Theater to Laboratory: A Survey. Ann Maxillofac Surg. 2018 Jul-Dec;8(2):234-238. Pubmed PMID: 30693238.
- Somasundaram S, Ravi K, Rajapandian K, Gurunathan D. Fluoride Content of Bottled Drinking Water in Chennai, Tamilnadu. J Clin Diagn Res. 2015 Oct;9(10):ZC32-4.Pubmed PMID: 26557612.
- Felicita AS. Orthodontic extrusion of Ellis Class VIII fracture of maxillary lateral incisor - The sling shot method. Saudi Dent J. 2018 Jul;30(3):265- 269.Pubmed PMID: 29942113.
- Kumar S, Rahman RE. Knowledge, awareness, and practices regarding biomedical waste management among undergraduate dental students. Asian J Pharm Clin Res. 2017;10(8):341.
- Gurunathan D, Shanmugaavel AK. Dental neglect among children in Chennai. J Indian Soc Pedod Prev Dent. 2016 Oct 1;34(4):364.
- Sneha S. Knowledge and awareness regarding antibiotic prophylaxis for infective endocarditis among undergraduate dental students. Asian J Pharm Clin Res. 2016 Oct 1:154-9.
- Dhinesh B, Lalvani JI, Parthasarathy M, Annamalai K. An assessment on performance, emission and combustion characteristics of single cylinder diesel engine powered by Cymbopogon flexuosus biofuel. Energy Convers Manage. 2016 Jun 1;117:466-74.
- Choudhari S, Thenmozhi MS. Occurrence and Importance of Posterior Condylar Foramen. LATERALITY. 2016 Aug 28;8:11-43.
- Paramasivam A, Vijayashree Priyadharsini J, Raghunandhakumar S. N6- adenosine methylation (m6A): a promising new molecular target in hypertension and cardiovascular diseases. Hypertens Res. 2020 Feb;43(2):153- 154.Pubmed PMID: 31578458.
- Wu F, Zhu J, Li G, Wang J, Veeraraghavan VP, Krishna Mohan S, et al. Biologically synthesized green gold nanoparticles from Siberian ginseng induce growth-inhibitory effect on melanoma cells (B16). Artif Cells Nanomed Biotechnol. 2019 Dec;47(1):3297-3305.Pubmed PMID: 31379212.
- Palati S, Ramani P, Shrelin HJ, Sukumaran G, Ramasubramanian A, Don KR, et al. Knowledge, Attitude and practice survey on the perspective of oral lesions and dental health in geriatric patients residing in old age homes. Indian J Dent Res. 2020 Jan-Feb;31(1):22-25.Pubmed PMID: 32246676.
- Saravanan M, Arokiyaraj S, Lakshmi T, Pugazhendhi A. Synthesis of silver nanoparticles from Phenerochaete chrysosporium (MTCC-787) and their antibacterial activity against human pathogenic bacteria. Microb Pathog. 2018 Apr;117:68-72.Pubmed PMID: 29427709.
- Govindaraju L, Gurunathan D. Effectiveness of Chewable Tooth Brush in Children-A Prospective Clinical Study. J Clin Diagn Res. 2017 Mar;11(3):ZC31-ZC34.Pubmed PMID: 28511505.,/
- Vijayakumar Jain S, Muthusekhar MR, Baig MF, Senthilnathan P, Loganathan S, Abdul Wahab PU, et al. Evaluation of Three-Dimensional Changes in Pharyngeal Airway Following Isolated Lefort One Osteotomy for the Correction of Vertical Maxillary Excess: A Prospective Study. J Maxillofac Oral Surg. 2019 Mar;18(1):139-146.Pubmed PMID: 30728705.
- Issac E. PREVALENCE OF ENDO-PERIO LESIONS AMONG PEOPLE WITH TYPE II DIABETES MELLITUS IN SULLIA TALUK-A CROSS SECTIONAL STUDY.
- Grudianov AI, Makeeva MK, Piatgorskaia NV. Modern concepts of etiology, pathogenesis and treatment approaches to endo-perio lesions]. Vestn Ross Akad Med Nauk. 2013;(8):34-6.Pubmed PMID: 24340643.
- Emrich LJ, Shlossman M, Genco RJ. Periodontal disease in non-insulin-dependent diabetes mellitus. J Periodontol. 1991 Feb;62(2):123-31.
- Kavarthapu A, Malaiappan S. Management of periodontic-endodontic lesion in aggressive periodontitis-9 months follow-up: Report of a case. Indian J Dent Res. 2019 Jan-Feb;30(1):149-153.Pubmed PMID: 30900677.
- . Vishwanath V, Rao HM, Prasad BK, Shashikala K. Successful endodontic management of endo-perio lesions with different treatment modalities: Case series. SRM J Res Dent Sci. 2019 Apr 1;10(2):105.
- Vijayashree Priyadharsini J. In silico validation of the non-antibiotic drugs acetaminophen and ibuprofen as antibacterial agents against red complex pathogens. J Periodontol. 2019 Dec;90(12):1441-1448.Pubmed PMID: 31257588.
- PC J, Marimuthu T, Devadoss P, Kumar SM. Prevalence and measurement of anterior loop of the mandibular canal using CBCT: A cross sectional study. Clin Implant Dent Relat Res. 2018 Apr 6;20(4):531-4.
- Ramesh A, Varghese S, Jayakumar ND, Malaiappan S. Comparative estimation of sulfiredoxin levels between chronic periodontitis and healthy patients - A case-control study. J Periodontol. 2018 Oct;89(10):1241-1248.Pubmed PMID: 30044495.
- Ramadurai N, Gurunathan D, Samuel AV, Subramanian E, Rodrigues SJ. Effectiveness of 2% Articaine as an anesthetic agent in children: randomized controlled trial. Clin Oral Investig. 2019 Sep;23(9):3543-50.
- Sridharan G, Ramani P, Patankar S, Vijayaraghavan R. Evaluation of salivary metabolomics in oral leukoplakia and oral squamous cell carcinoma. J Oral Pathol Med. 2019 Apr;48(4):299-306.
- Ezhilarasan D, Apoorva VS, Ashok Vardhan N. Syzygium cumini extract induced reactive oxygen species-mediated apoptosis in human oral squamous carcinoma cells. J Oral Pathol Med. 2019 Feb;48(2):115-121.Pubmed PMID: 30451321.
- Mathew MG, Samuel SR, Soni AJ, Roopa KB. Evaluation of adhesion of Streptococcus mutans, plaque accumulation on zirconia and stainless steel crowns, and surrounding gingival inflammation in primary molars: randomized controlled trial. Clin Oral Investig. 2020 Sep;24(9):1-6.Pubmed PMID: 31955271.
- Samuel SR. Can 5-year-olds sensibly self-report the impact of developmental enamel defects on their quality of life? Int J Paediatr Dent. 2021 Mar;31(2):285-286.Pubmed PMID: 32416620.
- R H, Ramani P, Ramanathan A, R JM, S G, Ramasubramanian A, et al. CYP2 C9 polymorphism among patients with oral squamous cell carcinoma and its role in altering the metabolism of benzo[a]pyrene. Oral Surg Oral Med Oral Pathol Oral Radiol. 2020 Sep;130(3):306-312.Pubmed PMID: 32773350.
- Chandrasekar R, Chandrasekhar S, Sundari KKS, Ravi P. Development and validation of a formula for objective assessment of cervical vertebral bone age. Prog Orthod. 2020 Oct 12;21(1):38.Pubmed PMID: 33043408.
- Vijayashree Priyadharsini J, Smiline Girija AS, Paramasivam A. In silico analysis of virulence genes in an emerging dental pathogen A. baumannii and related species. Arch Oral Biol. 2018 Oct;94:93-98.Pubmed PMID: 30015217.
- Eke PI, Dye BA, Wei L, Thornton-Evans GO, Genco RJ. Prevalence of periodontitis in adults in the United States: 2009 and 2010. J. Dent. Res. 2012 Oct;91(10):914-20.
- Anerud A, Löe H, Boysen H, Smith M. The natural history of periodontal disease in man. Changes in gingival health and oral hygiene before 40 years of age. J Periodontal Res. 1979 Nov;14(6):526-40.Pubmed PMID: 161591.
- Löe H, Anerud A, Boysen H. The natural history of periodontal disease in man: prevalence, severity, and extent of gingival recession. J Periodontol. 1992 Jun;63(6):489-95.Pubmed PMID: 1625148.