The relationships between the arrangement of teeth, root resorption, and dental maturity in bovine mandibular incisors
An Jin-Kyu, Matsumoto Yoshiro, Ono Takashi,
소속 상세정보
( An Jin-Kyu ) - Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences Department of Orthodontic Science
( Matsumoto Yoshiro ) - Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences Department of Orthodontic Science
( Ono Takashi ) - Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences Department of Orthodontic Science
Abstract
Objective: The objective of this study is to investigate the eruption pattern androot resorption of the bovine anterior dentition in relation to growth-relatedparameters based on dental maturity.
Methods: A cross-sectional study wasconducted on 110 bovine anterior mandibles by using standard radiography,cone-beam computed tomography (CBCT), and actual measurements. Wedetermined the relationships between the stages of dental maturity by using amodification of Demirjian’s method and various growth-related parameters, suchas the activity of the root-resorbing tissue and mobility of the deciduous teeth.The correlation of growth-related parameters with interdental spacing and distalunusual root resorption (DRR) of the deciduous fourth incisor was assessed.The cause of mesial unusual root resorption (MRR) of the deciduous fourthincisor was determined on the basis of the arrangement of the permanent thirdincisor.
Results: An independent t-test and chi-square test indicated significantdifferences in growth-related parameters associated with dental arch lengthdiscrepancy and factors related to the shedding of deciduous teeth between thelow and high dental maturity groups. The samples with interdental spacing andDRR showed a larger sum of mesiodistal permanent crown widths and higherdental maturity than did the respective controls. Samples with MRR tended toshow a lingually rotated distal tip of the adjacent tooth crown.
Conclusions:Dental maturity has relevance to the interdental spaces and unusual rootresorption of mixed dentition. The position of the adjacent tooth crown onCBCT may be correlated with the occurrence of unusual root resorption of theincisor.
키워드
Growth and development; Root resorption; Ectopic eruption; Computed tomography
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