Abstract

Objective The purpose of this study was to observe the three-dimensional growth and development of the maxillary arch in 10-year-olds with normal occlusion during the late mixed dentition stage. Methods Forty-four 10-year-old students (22 males and 22 females) who had normal occlusion during late mixed dentition were selected from an elementary school in Beijing, China. Once per year for three consecutive years, a dental cast was obtained from each subject, and the cast was scanned with a 3D digital scanner (R700 3D). The three-dimensional measurements of the maxillary dental arch and the inclination of the bilateral maxillary first molars were obtained from the digital model. Results The upper anterior arch length (UAAL), upper total arch length (UTAL), upper inter primary or permanent canine width (UICW), upper intermolar width (UIMW), and upper dental arch length (UDAL) increased by 0.959 mm, 0.583 mm, 0.955 mm, 1.462 mm, and 2.46 mm, respectively, over the two years (P < 0.001). UR6BL and UL6BL decreased by 4.416° and 7.133°, respectively, over the two years (P < 0.001). The values of the UICW and UIMW were 1.67 mm and 1.86 mm, respectively, larger in males than in females at 12 years old (P < 0.01). The change in the UTAL was 0.431 mm greater in males than in females over the 2 years (P < 0.05). Conclusion The UAAL, UTAL, UICW, UIMW, and UDAL in 10- to 12-year-olds with normal occlusion increased with age. The buccolingual inclination of the bilateral maxillary first molars inclined to the palatal side with age. The UICW and UIMW were larger in males than in females at 12 years old. The male UTAL increased more than the female UTAL over the 2 years.

Highlights

  • A 2-year-follow-up of 10-year-olds with normal occlusion was performed in this study, and the upper anterior arch length (UAAL) and upper total arch length (UTAL) increased significantly with age. is is consistent with the results of the Louly et al [12] and Alkadhi et al [13] studies

  • E UTAL is the perpendicular distance from the mesial contact point of the central incisor to the connecting line between the mesial contact points of the bilateral maxillary first molars

  • A change in UTAL is affected by the growth and development of the maxillary arch and by mesiodistal movement and the inclination of the maxillary first molar, which affects the position of the mesial contact point

Read more

Summary

Research Article

Evaluation of Growth and Development of Late Mixed Dentition Upper Dental Arch with Normal Occlusion Using 3-Dimensional Digital Models. E purpose of this study was to observe the three-dimensional growth and development of the maxillary arch in 10-year-olds with normal occlusion during the late mixed dentition stage. E purpose of this study was to use a digital model generated with a 3Shape R700 scanner for 2 years of observations of the 3D growth of the maxillary dental arch and mesiodistal and buccolingual inclinations of the bilateral maxillary first molars. It investigated whether there was a sex-based difference in the dental arch and dental arch changes

Materials and Methods
Upper inter primary or permanent canine width
UTAL d e
Discussion
NS NS years years years
Male Female
Conclusion
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call