Dentin Thickness of Pulp Chamber Floor in Primary Molars: Evaluation by Cone-Beam Computed Tomography


  • Mariane Bovino
  • Larissa de Souza Santos
  • Larissa Lopes Freitas de Albuquerque Cavalcante
  • Cacilda Castelo Branco Lima
  • Marina de Deus Moura de Lima
  • Marcoeli Silva de Moura
  • Paulo de Tarso Silva de Macêdo
  • Lucia de Fátima Almeida de Deus Moura


Dental Pulp Cavity, Dentin, Cone Beam Computed Tomography, Molar, Child


Objective: Use cone-beam computed tomography (CBCT) images to evaluate the dentin thickness of the pulp chamber floor in primary molars. Material and Methods: Cross-sectional study, conducted with CBCT images of teeth of children.  Primary molars with preserved pulp chamber floor were included. The dentin thickness of the pulp chamber floor in the primary molars was measured linearly in CBCT cross-sections. Data were descriptively analyzed and the Mann-Whitney test was applied (p<0.05). Results: 27 CBCT exams and 123 primary molars of children aged 4 to 13 years were analyzed; the majority was female (52.0%). In maxillary molars, the median dentin thickness was 1.50 (0.6–2.2) mm in the first and 1.65 (0.6–2.3) mm in the second (p=0.049) molars. In mandibular molars, the median was 1.20 (0.3–1.7) mm in the first and 1.60 (1.0–2.2) mm in the second (p<0.001) molars. Children aged 4 to 8 years showed less dentin thickness (p<0.001). Conclusion: The median dentin thickness of the pulp chamber floor in primary molars was 1.50 mm, ranging from 0.3 to 2.3 mm. Less dentin thickness was associated with younger children, teeth in the mandibular arch, and first molars.


Ahmed HMA, Khamis MF, Gutmann JL. Seven root canals in a deciduous maxillary molar detected by the dental operating microscope and micro-computed tomography. Scanning 2016; 38(6):554-7.

Ariffin SM, Dalzell O, Hardiman R, Manton DJ, Parashos P, Rajan S. Root canal morphology of primary maxillary second molars: a micro-computed tomography analysis. Eur Arch Paediatr Dent 2020; 21(4):1-7.

Sharma U, Gulati A, Gill N. An investigation of accessory canals in primary molars–an analytical study. Int J Paediatr Dent 2016; 26(2):149-56.

Cheong J, Chiam S, King NM, Anthonappa RP. Pulp chamber analysis of primary molars using micro-computed tomography: Preliminary findings. J Clin Pediatr Dent 2019; 43(6):382-7.

Kramer PF, Faraco Júnior IM, Meira R. A SEM investigation of acessory foramina in the furcation áreas of primary molars. J Clin Pediatr Dent 2003; 27(2):157-61.

Kumar VD. A scanning alectron microscope study of prevalence of acessory canals on the pulpar floor of deciduous molars. J Indian Soc Pedod Prev Dent 2009; 27(2):85-9.

Lugliè PF, Grabesu V, Spano G, Lumbau A. Acessory foramina in the furcation area of primary molars. A SEM investigation. Eur J Paediatr Dent 2012; 13(4):329-32.

Cordeiro MMR, Rocha MJC. The effects of periradicular inflamation and infection on a primary tooth and permanent sucessor. J Clin Pediatr Dent 2005; 29(3):193-200.

Guglielmi CAB, Romalho KM, Scaramucci T, Silva SREP, Imparato JCP, Pinheiro SL. Evaluation of the furcation area permeability of deciduous molars treated by neodymium: yttrium-aluinum-garnet laser or adhesive. Lasers Med Sci 2010; 25(6):873-80.

Sousa HCS, Lima MDM, Lima CCB, Moura MS, Bandeira AVL, Moura LFAD. Prevalence of enamel defects in premolars whose predecessors were treated with extractions or antibiotic paste. Oral Health Prev Dent 2020; 18(1):793-8.

Dabawala S, Chacko V, Suprabha BS, Rao A, Natarajan S, Ongole R. Evaluation of pulp chamber dimensions of primary molars from bitewing radiographs. Pediatr Dent 2015; 37(4):361-5.

Gentner MR, Meyers IA, Symons AL. The floor of the pulp chamber following pulpotomy. J Clin Pediatr Dent 1991; 16(1):20-4.

Vijayakumar R, Selvakumar H, Swaminathan K, Thomas E, Ganesh R, Palanimuthu S. Root canal morphology of human primary maxillary molars in Indian population using spiral computed tomography scan: An in vitro study. SRM J Res Dent Sci 2013; 4(4):139-42.

Selvakumar H, Kavitha S, Vijayakumar R, Eapen T, Bharathan R. Study of pulp chamber morphology of primary mandibular molars using spiral computed tomography. J Contemp Dent Pract 2014; 15(6):726-9.

Patel S, Brown J, Pimentel T, Kelly RD, Abella F, Durack C. Cone beam computed tomography in Endodontics – a review of the literature. Int Endod J 2019; 52(8):1138-52.

Scarfe WC, Farman AG, Sukovic P. Clinical applications of cone-beam computed tomography in dental practice. J Can Dent Assoc 2006; 72(1):75-80.

Azim AA, Azim KA, Deutsch AS, Huang GTJ. Acquisition of anatomic parameters concerning molar pulp chambre landmarts using cone-beam computed tomography. J Endod 2014; 40(9):1298-1302.

Xu J, He J, Yang Q, Huang D, Zbou X, Peters DA, et al. Accuracy of cone-beam computed tomography in measuring dentin thickness and its potential of predicting the remaining dentin thickness after removing fractured instruments. J Endod 2017; 43(9):1522-7.

Amano M, Agematsu H, Abe S, Usami A, Matsunaga S, Suto K, et al. Three-dimensional analysis of pulp chambers in maxillary second deciduous molars. J Dent 2006; 34(7):503-8.

Tsatsoulis IN, Filippatos CG, Floratos SG, Kontakiotis EG. Estimation of radiographic angles and distances in coronal part of mandibular molars: A study of panoramic radiographs using EMAGO software. Eur J Dent 2014; 8(1):90-4.

Kurthukoti AJ, Sharma P, Swamy DF, Shashidara R, Swamy EB. Computed tomographic morphometry of the internal anatomy of mandibular second primary molars. Int J Clin Pediatr Dent 2015; 8(3):202-7.

Moshfeghi M, Tavakoli MA, Hosseini ET, Hosseini AT, Hosseini IT. Analysis of linear measurement accuracy obtained by cone beam computed tomography (CBCT-NewTom VG). Dent Res J 2012; 9(Suppl 1):S57-S62.

Lascala CA, Panella J, Marques MM. Analysis of the accuracy of linear measurements obtained by cone beam computed tomography (CBCT-NewTom). Dentomaxillofac Radiol 2004; 33(5):291-4.

Stratemann SA, Huang JC, Maki K, Miller AJ, Hatcher DC. Comparison of cone beam computed tomography imaging with physical measures. Dentomaxillofac Radiol 2008; 37(2):80-93.

Yawaka Y, Osanai M, Akiyama A, Ninomiya R, Oguchi H. Histological study of deposited cementum in human deciduous teeth with pathological root resorption. Ann Anat 2003; 185(4):335-41.




How to Cite

Bovino, M. ., Santos, L. de S. ., Cavalcante, L. L. F. de A. ., Lima, C. C. B., de Lima, M. de D. M. ., de Moura, M. S. ., de Macêdo, P. de T. S. ., & Moura, L. de F. A. de D. . (2021). Dentin Thickness of Pulp Chamber Floor in Primary Molars: Evaluation by Cone-Beam Computed Tomography. Pesquisa Brasileira Em Odontopediatria E Clínica Integrada, 21, e0013. Retrieved from



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