Maxillary and mandibular dental arch forms in a Jordanian population with normal occlusion
Background
Ethnic background had been claimed to affect arch form. The purpose of this study was to describe the maxillary and mandibular arch forms in Jordanian population and to develop a classification of these forms which could be used to construct orthodontic archwires accordingly.
Methods
The sample comprised the study casts of five hundred and twenty subjects (231 males and 289 females with mean age 15.4 ± 1.02 years). All subjects had permanent dentition with normal occlusion. A mathematical method associated with a polynomial function of 6th degree was used to evaluate the dental arch forms. The resulting arch forms were organized into 5 groups for both the maxilla and the mandible utilizing computer software with special code designed for this study. Each group was subdivided into 3 subgroups: small, medium, and large sizes.
Results
Catenary arch form was found in 47% and 41.2% (P˂0.01) in maxilla and mandible, respectively. Form 2 (between half ellipse and U-shaped arch form) was found in 27.7% and 26.7%. Medium size arch form was found in 55.4% in the maxilla and 65.6% in the mandible.
Conclusions
Catenary arch form was the most common arch form, followed by wide elliptical form. The other forms; tudor arch, tapered equilateral and quadroangular forms were less frequent. With respect to size, the medium size was the most common one in the studied sample.
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Posted 16 Dec, 2020
Received 16 Dec, 2020
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On 14 Dec, 2020
Posted 15 Nov, 2020
On 15 Nov, 2020
Received 09 Nov, 2020
On 01 Nov, 2020
Received 30 Oct, 2020
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On 29 Oct, 2020
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Posted 17 Sep, 2020
On 12 Oct, 2020
Received 11 Oct, 2020
Received 10 Oct, 2020
On 26 Sep, 2020
Invitations sent on 21 Sep, 2020
On 21 Sep, 2020
On 21 Sep, 2020
On 27 Aug, 2020
On 26 Aug, 2020
On 26 Aug, 2020
On 25 Aug, 2020
Maxillary and mandibular dental arch forms in a Jordanian population with normal occlusion
Posted 16 Dec, 2020
Received 16 Dec, 2020
On 15 Dec, 2020
On 14 Dec, 2020
Invitations sent on 14 Dec, 2020
On 14 Dec, 2020
On 14 Dec, 2020
Posted 15 Nov, 2020
On 15 Nov, 2020
Received 09 Nov, 2020
On 01 Nov, 2020
Received 30 Oct, 2020
Invitations sent on 29 Oct, 2020
On 29 Oct, 2020
On 21 Oct, 2020
On 20 Oct, 2020
On 20 Oct, 2020
Posted 17 Sep, 2020
On 12 Oct, 2020
Received 11 Oct, 2020
Received 10 Oct, 2020
On 26 Sep, 2020
Invitations sent on 21 Sep, 2020
On 21 Sep, 2020
On 21 Sep, 2020
On 27 Aug, 2020
On 26 Aug, 2020
On 26 Aug, 2020
On 25 Aug, 2020
Background
Ethnic background had been claimed to affect arch form. The purpose of this study was to describe the maxillary and mandibular arch forms in Jordanian population and to develop a classification of these forms which could be used to construct orthodontic archwires accordingly.
Methods
The sample comprised the study casts of five hundred and twenty subjects (231 males and 289 females with mean age 15.4 ± 1.02 years). All subjects had permanent dentition with normal occlusion. A mathematical method associated with a polynomial function of 6th degree was used to evaluate the dental arch forms. The resulting arch forms were organized into 5 groups for both the maxilla and the mandible utilizing computer software with special code designed for this study. Each group was subdivided into 3 subgroups: small, medium, and large sizes.
Results
Catenary arch form was found in 47% and 41.2% (P˂0.01) in maxilla and mandible, respectively. Form 2 (between half ellipse and U-shaped arch form) was found in 27.7% and 26.7%. Medium size arch form was found in 55.4% in the maxilla and 65.6% in the mandible.
Conclusions
Catenary arch form was the most common arch form, followed by wide elliptical form. The other forms; tudor arch, tapered equilateral and quadroangular forms were less frequent. With respect to size, the medium size was the most common one in the studied sample.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7