Evidence favoring a secular reduction in mandibular leeway space
OBJECTIVE: Researchers have documented secular trends in tooth size among recent generations. This study was a test for a change in mandibular leeway space.
MATERIALS AND METHODS: Dental casts from participants in the Denver Growth Study (23 boys, 22 girls; born in the 1930s) were compared with casts from a contemporary series of orthodontic patients (23 boys, 22 girls; born in the 1990s). All were phenotypically normal, healthy American whites.
RESULTS: Analysis of variance (accounting for sex) showed that the cumulative mandibular primary canine plus first and second primary molar size (c + m1 + m2) was slightly larger in the recent cohort (23.53 mm earlier vs 23.83 mm recent cohort; mean difference: 0.30 mm; P = .009), principally due to larger second primary molars (m2) in the recent cohort. In turn, the sum of the permanent canine and two premolars (C + P1 + P2) was significantly larger in the recent cohort (21.08 mm earlier vs 21.80 mm recent cohort; mean difference: 0.72 mm; P = .002). Larger teeth in the contemporary series produced a mean leeway space per quadrant of 2.03 mm versus 2.45 mm in the earlier cohort-a clinically and statistically significant reduction (P = .030). Some tooth types (primary second molar and permanent canine) were significantly larger in boys than in girls, but the sex difference in leeway space was not statistically significant.
CONCLUSION: Results suggest that mandibular leeway space is decreasing in 21st century American whites and may present a challenge to orthodontists in managing tooth size-arch length discrepancies.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2017 |
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| Erschienen: |
2017 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:87 |
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| Enthalten in: |
The Angle orthodontist - 87(2017), 4 vom: 03. Juli, Seite 576-582 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Allen, Tyler R [VerfasserIn] |
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| Links: |
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| Themen: |
Arch size |
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| Anmerkungen: |
Date Completed 18.05.2018 Date Revised 07.12.2022 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.2319/091416-688.1 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM270080112 |
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| 245 | 1 | 0 | |a Evidence favoring a secular reduction in mandibular leeway space |
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| 500 | |a Date Completed 18.05.2018 | ||
| 500 | |a Date Revised 07.12.2022 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a OBJECTIVE: Researchers have documented secular trends in tooth size among recent generations. This study was a test for a change in mandibular leeway space | ||
| 520 | |a MATERIALS AND METHODS: Dental casts from participants in the Denver Growth Study (23 boys, 22 girls; born in the 1930s) were compared with casts from a contemporary series of orthodontic patients (23 boys, 22 girls; born in the 1990s). All were phenotypically normal, healthy American whites | ||
| 520 | |a RESULTS: Analysis of variance (accounting for sex) showed that the cumulative mandibular primary canine plus first and second primary molar size (c + m1 + m2) was slightly larger in the recent cohort (23.53 mm earlier vs 23.83 mm recent cohort; mean difference: 0.30 mm; P = .009), principally due to larger second primary molars (m2) in the recent cohort. In turn, the sum of the permanent canine and two premolars (C + P1 + P2) was significantly larger in the recent cohort (21.08 mm earlier vs 21.80 mm recent cohort; mean difference: 0.72 mm; P = .002). Larger teeth in the contemporary series produced a mean leeway space per quadrant of 2.03 mm versus 2.45 mm in the earlier cohort-a clinically and statistically significant reduction (P = .030). Some tooth types (primary second molar and permanent canine) were significantly larger in boys than in girls, but the sex difference in leeway space was not statistically significant | ||
| 520 | |a CONCLUSION: Results suggest that mandibular leeway space is decreasing in 21st century American whites and may present a challenge to orthodontists in managing tooth size-arch length discrepancies | ||
| 650 | 4 | |a Comparative Study | |
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Arch size | |
| 650 | 4 | |a Environment | |
| 650 | 4 | |a Leeway | |
| 650 | 4 | |a Secular trend | |
| 650 | 4 | |a Tooth size | |
| 700 | 1 | |a Trojan, Terry M |e verfasserin |4 aut | |
| 700 | 1 | |a Harris, Edward F |e verfasserin |4 aut | |
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