Retained primary tooth in unusual ages in southern Iran: A population-based study

Document Type: Original Article

Authors

1 Assistant Professor, Department of Community Medicine, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran

2 Dentist, Larestan University of Medical Sciences, Larestan, Iran

3 Department of Emergency Medicine, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran

4 Communicable Diseases Unit, Shohada-e-Enghelab Health Center, Shiraz University of Medical Sciences, Shiraz, Iran

Abstract

BACKGROUND AND AIM: The retained primary tooth (RPT) is a tooth that remains beyond its exfoliation time, which can cause some problems. This study aimed to evaluate the prevalence of RPT in unusual ages in Larestan, a city in Fars Province, southern Iran.
METHODS: In this cross-sectional population-based study (April-October 2015), clinical and radiological evaluations were done for all patients referred to Larestan dentistry clinics. The characteristics of RPT were evaluated. All data were analyzed statistically using SPSS and MedCalc software (α = 0.05).
RESULTS: Among 2106 patients, 145 (6.88%) had at least one RPT. The most frequent RPT were primary canine in the maxilla (42.45%) and second primary molar in the mandible (33.01%). The main cause of RPT was absence of permanent successor tooth congenitally (67.45%) and impaction of it (33.54%). The most tooth mobility was class III (17.92%) and the second molar in mandible had the most mobility (6.60%). Root resorption was seen in about 45% of patients, which level 3 was the most (24.76%), mostly in second molar in mandible. Infra-occlusion was seen only in 5.18% of patients. There were significant correlations between root resorption and age (r = 0.175, P = 0.0360) and gender (r = 0.171, P = 0.0400), mobility and decay (r = 0.470, P < 0.0010), as well as infra-occlusion (r = 0.262, P = 0.0010).
CONCLUSION: The prevalence of RPT in unusual ages was not high in this study, but exact examination can detect the RPT earlier, to prevent the related problems by suitable treatments. Studies in larger population are recommended.

Keywords


  1. Robinson S, Chan MF. New teeth from old: Treatment options for retained primary teeth. Br Dent J 2009; 207(7): 315-20.
  2. Onyeaso CO. Incidence of retained deciduous teeth in a Nigerian population: An indication of poor dental awareness/attitude. Odontostomatol Trop 2005; 28(111): 5-9.
  3. Nordquist I, Lennartsson B, Paulander J. Primary teeth in adults--a pilot study. Swed Dent J 2005; 29(1): 27-34.
  4. Gupta P, Gupta N, Gupta R, Arora V, Mehta N. The prevalence of oro-dental anomalies among 14-17 years students in Panchkula District Haryana, India. J Dent Oral Hyg 2015; 7(4): 44-7.
  5. Jose A, Joseph MR. Prevalence of dental health problems among school going children in rural Kerala. J Indian Soc Pedod Prev Dent 2003; 21(4): 147-51.
  6. Garib BT. The prevalence of oral developmental disturbances and dental alignment anomalies in females of secondary schools in Thamar city (14-21years). J Bagh Coll Dentistry 2006; 18(2): 35-9.
  7. Javali R, Meti M. Prevalence of developmental anomalies of teeth in a group of North Karnataka population, India. Int J Dent Res 2015; 3(1): 5-9.
  8. Ali ZH. Evaluation of the mineralized tissue in the pulp of retained human deciduous teeth (Histolog-ical and immunohistochemical study). Journal of American Science 2012; 8(1): 398-407.
  9. Al-Najjar M. Long-term follow-up of mandibular second primary molar in patients with agenesis of mandibular second premolar. Kronoberg, Sweden: Landstinget Kronoberg; 2006.
  10. Arhakis A, Boutiou E. Etiology, diagnosis, consequences and treatment of infraoccluded primary molars. Open Dent J 2016; 10: 714-9.
  11. Aktan AM, Kara I, Sener I, Bereket C, Celik S, Kirtay M, et al. An evaluation of factors associated with persistent primary teeth. Eur J Orthod 2012; 34(2): 208-12.
  12. Sheikhi M, Sadeghi MA, Ghorbanizadeh S. Prevalence of congenitally missing permanent teeth in Iran. Dent Res J (Isfahan) 2012; 9(Suppl 1): 105-11.
  13. Vahid-Dastjerdi E, Borzabadi-Farahani A, Mahdian M, Amini N. Non-syndromic hypodontia in an Iranian orthodontic population. J Oral Sci 2010; 52(3): 455-61.
  14. Statistical Center of Iran. Population and Housing Censuses, 2016 [Online]. [cited 2018 Dec 16]; Available from: URL: https://www.amar.org.ir/english/Population-and-Housing-Censuses
  15. Miller PD, Jr. A classification of marginal tissue recession. Int J Periodontics Restorative Dent 1985; 5(2): 8-13.
  16. Bjerklin K, Bennett J. The long-term survival of lower second primary molars in subjects with agenesis of the premolars. Eur J Orthod 2000; 22(3): 245-55.
  17. Hvaring CL, Ogaard B, Stenvik A, Birkeland K. The prognosis of retained primary molars without successors: infraocclusion, root resorption and restorations in 111 patients. Eur J Orthod 2014; 36(1): 26-30.
  18. Hedayati Z, Dashlibrun YN. The prevalence and distribution pattern of hypodontia among orthodontic patients in Southern Iran. Eur J Dent 2013; 7(Suppl 1): S78-S82.
  19. Behr M, Proff P, Leitzmann M, Pretzel M, Handel G, Schmalz G, et al. Survey of congenitally missing teeth in orthodontic patients in Eastern Bavaria. Eur J Orthod 2011; 33(1): 32-6.
  20. Sisman Y, Uysal T, Gelgor IE. Hypodontia. Does the prevalence and distribution pattern differ in orthodontic patients? Eur J Dent 2007; 1(3): 167-73.
  21. Fekonja A. Hypodontia in orthodontically treated children. Eur J Orthod 2005; 27(5): 457-60.
  22. Amini F, Rakhshan V, Babaei P. Prevalence and pattern of hypodontia in the permanent dentition of 3374 Iranian orthodontic patients. Dent Res J (Isfahan) 2012; 9(3): 245-50.