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Effects of rapid-slow maxillary expansion on the dentofacial structures.
Aust Orthod J. 2010 Nov; 26(2):178-83.AO

Abstract

BACKGROUND

To date, no study has determined if rapid followed by slow maxillary expansion (also termed 'semi-rapid' expansion) has the same effects on the dentofacial skeleton as rapid maxillary expansion.

OBJECTIVE

To determine the vertical and sagittal changes in the facial skeleton during and following rapid then slow maxillary expansion (R-SME).

METHODS

Bonded maxillary expansion appliances were used to separate the maxillae over six days by activating the midline screws twice a day. The screws were then activated three times a week until sufficient expansion was obtained (Mean: 3.4 months) and used as retainers for six months. Cephalometric measurements at the start of expansion (T1), end of expansion (T2) and end of retention (T3) were compared with paired t-tests. Pearson correlation coefficients were used to determine the associations between the expansion (dental and skeletal) and the cephalometric changes.

RESULTS

The maxillae moved forward a small, but statistically significant, extent during expansion. The upper molars were extruded and the mandible 'rotated' downward and backward. Although the vertical height of the facial skeleton (SN/GoMe, S-Go, N-Me, ANS-Me) increased significantly during expansion, the changes were small and highly variable. Some dimensions (SN/GoMe) relapsed during retention, while others (S-Go, N-Me) increased.

CONCLUSIONS

Rapid then slow maxillary expansion caused a small, but statistically significant, forward movement of the upper facial skeleton, a small downward and backward rotation of the mandible and a small increase in face height. The changes were similar to those found during rapid maxillary expansion.

Authors+Show Affiliations

Department of Orthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey. drnkilic@yahoo.comNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

21175029

Citation

Kilic, Nihat, and Hüsamettin Oktay. "Effects of Rapid-slow Maxillary Expansion On the Dentofacial Structures." Australian Orthodontic Journal, vol. 26, no. 2, 2010, pp. 178-83.
Kilic N, Oktay H. Effects of rapid-slow maxillary expansion on the dentofacial structures. Aust Orthod J. 2010;26(2):178-83.
Kilic, N., & Oktay, H. (2010). Effects of rapid-slow maxillary expansion on the dentofacial structures. Australian Orthodontic Journal, 26(2), 178-83.
Kilic N, Oktay H. Effects of Rapid-slow Maxillary Expansion On the Dentofacial Structures. Aust Orthod J. 2010;26(2):178-83. PubMed PMID: 21175029.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of rapid-slow maxillary expansion on the dentofacial structures. AU - Kilic,Nihat, AU - Oktay,Hüsamettin, PY - 2010/12/24/entrez PY - 2010/12/24/pubmed PY - 2011/2/25/medline SP - 178 EP - 83 JF - Australian orthodontic journal JO - Aust Orthod J VL - 26 IS - 2 N2 - BACKGROUND: To date, no study has determined if rapid followed by slow maxillary expansion (also termed 'semi-rapid' expansion) has the same effects on the dentofacial skeleton as rapid maxillary expansion. OBJECTIVE: To determine the vertical and sagittal changes in the facial skeleton during and following rapid then slow maxillary expansion (R-SME). METHODS: Bonded maxillary expansion appliances were used to separate the maxillae over six days by activating the midline screws twice a day. The screws were then activated three times a week until sufficient expansion was obtained (Mean: 3.4 months) and used as retainers for six months. Cephalometric measurements at the start of expansion (T1), end of expansion (T2) and end of retention (T3) were compared with paired t-tests. Pearson correlation coefficients were used to determine the associations between the expansion (dental and skeletal) and the cephalometric changes. RESULTS: The maxillae moved forward a small, but statistically significant, extent during expansion. The upper molars were extruded and the mandible 'rotated' downward and backward. Although the vertical height of the facial skeleton (SN/GoMe, S-Go, N-Me, ANS-Me) increased significantly during expansion, the changes were small and highly variable. Some dimensions (SN/GoMe) relapsed during retention, while others (S-Go, N-Me) increased. CONCLUSIONS: Rapid then slow maxillary expansion caused a small, but statistically significant, forward movement of the upper facial skeleton, a small downward and backward rotation of the mandible and a small increase in face height. The changes were similar to those found during rapid maxillary expansion. SN - 0587-3908 UR - https://www.unboundmedicine.com/medline/citation/21175029/Effects_of_rapid_slow_maxillary_expansion_on_the_dentofacial_structures_ L2 - https://antibodies.cancer.gov/detail/CPTC-SIGLEC1-1 DB - PRIME DP - Unbound Medicine ER -