Measurement of Apical Anatomy of Immature Maxillary Central Incisor using Cone-beam Computed Tomography

doi:10.13701/j.cnki.kqyxyj.2023.05.013

Abstract

Abstract: Objective: To investigate the CBCT findings of apical anatomy of immature maxillary central incisors. Methods: CBCT images of 100 immature maxillary central incisors at Nolla stage 8 and 100 immature maxillary central incisors at Nolla stage 9 were collected. The mesiodistal and carniocaudal diameters of apical foramen of immature maxillary central incisors were measured by software included with CBCT, as well as the mesiodistal, carniocaudal, and facioligual diameters of apical shadow. The diameters of apical shadow and apical foramen were compared between Nolla stage 8 and Nolla stage 9. The correlation between the diameters of apical shadow and apical foramen was calculated. The data were analyzed with MedCalc software package. Results: The mesiodistal and facioligual diameters of apical foramen of immature maxillary central incisors at Nolla stage 8 were (2.75±0.68) mm and (3.28±0.74) mm, respectively. The mesiodistal, facioligual, and carniocaudal diameters of apical shadow of immature maxillary central incisors at Nolla stage 8 were (3.84±0.73) mm, (4.49±0.68) mm, and (3.41±1.27) mm, respectively. The mesiodistal and facioligual diameters of apical foramen of immature maxillary central incisors at Nolla stage 9 were (1.50±0.51) mm and (1.92±0.79) mm, respectively. The mesiodistal, facioligual and carniocaudal diameters of apical shadow of immature maxillary central incisors at Nolla stage 9 were (2.76±0.60) mm, (3.41±0.80) mm, and (2.06±0.65) mm, respectively. The immature maxillary central incisors at Nolla 8 stage showed significantly larger apical shadow and apical foramen than those at Nolla 9 stage (P＜0.05). The mesiodistal, facioligual, and carniocaudal diameters of apical shadow were positively correlated with the mesiodistal and facioligual diameters of apical foramen (P＜0.001). The apical region of maxillary central incisors at Nolla 8 stage was more likely to have a broad and blurred lamina dura. With the development of apical foramen, lamina dura in the apical region tended to be clear and sharp. Conclusion: The immature maxillary central incisors at Nolla 8 stage have larger apical shadow and apical foramen than those at Nolla 9 stage. With the development of apical foramen, lamina dura in the apical region tends to be clear and sharp. Clinical diagnosis and treatment of periapical periodontitis could be improved with better understanding of apical anatomy.

Key words: immature maxillary central incisor, apical anatomy, cone-beam computed tomography

WANG Linlin, TIAN Hongsheng, XU Ying, FAN Mingru, QIN Xiurong. Measurement of Apical Anatomy of Immature Maxillary Central Incisor using Cone-beam Computed Tomography[J]. Journal of Oral Science Research, 2023, 39(5): 445-449.

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