Citation Information :
Fibryanto E, Tjin RR, Prahasti AE, Kusnoto J. Difference in Average Length of Maxillary Incisors between the Deuteromalayid and Protomalayid Sub-races. World J Dent 2021; 12 (2):111-114.
Aim and objective: The purpose of this study was to compare the differences in the average length of maxillary central and lateral incisors between the deuteromalayid and the protomalayid sub-race generally and differences between men and women in both sub-races.
Materials and methods: The samples of this study were maxillary central and lateral incisors periapical radiographs of male and female patients from deuteromalayid and protomalayid sub-races in Universitas Trisakti Dental Hospital (n = 200). Radiographic images were obtained from 50 men and 50 women in each of deuteromalayid and protomalayid aged 12–34 years, then the tooth length was measured using digital calipers (Nankai, Japan). The parallel technique of periapical radiograph was taken using the paralleling cone indicator device (Hanshin, Japan), digital dental X-ray devices (Dϋrr Dental Vitascan, England), and conventional dental X-ray (Veraview IX, Japan).
Results: The average length of maxillary central and lateral incisors from the deuteromalayid and protomalayid sub-races was analyzed with an independent t-test and revealed that there were significant differences between the groups (p < 0.05). The average length of maxillary central and lateral incisors for deuteromalayid was 24.70 ± 0.56 and 23.59 ± 0.62 mm, and the protomalayid was 25.66 ± 0.57 and 24.62 ± 0.63 mm, respectively. Based on gender, there were significant differences in the average length of maxillary central and lateral incisors between sub-races (p < 0.05). The average length of maxillary central and lateral incisors for protomalayid men was 26.05 ± 0.39 and 25.09 ± 0.44 mm, and protomalayid women was 25.27 ± 0.42 and 24.15 ± 0.41 mm, respectively. The average length of maxillary central and lateral incisors for deuteromalayid men was 25.06 ± 0.39 and 24.04 ± 0.44 mm, and deuteromalayid women was 24.33 ± 0.47 and 23.14 ± 0.42 mm, respectively. The interclass correlation coefficients were 0.999 and 0.991 and the intra-examiner correlation were 0.75 and 0.71.
Conclusion: The average length of the protomalayid maxillary central and lateral incisors is longer than the deuteromalayid sub-race. The men have a longer average length than women in both sub-races.
Clinical significance: The clinical application of this study is to be used as a reference to determine the estimated working length in endodontic treatment and as a demographic data reference regarding the length of the deuteromalayid and protomalayid sub-racial teeth.
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