AIM: To evaluate, by means of a low-dose computed tomography protocol, the dental and periodontal changes associated with rapid maxillary expansion (RME) at the end of the active phase and after 6 months of retention in a group of growing patients. SUBJECTS AND METHOD: Seventeen Caucasian children (7 males, 10 females), with a mean age at the fi rst observation of 11.2 years (range 8-14 years), and with cervical vertebral maturation stages ranging from CS1 to CS3 (pre-pubertal or pubertal) as assessed on lateral cephalograms. Each patient underwent a standardized protocol with RME. The expansion screw was activated twice a day for 14 days, thus reaching the total amount of expansion of 7 mm in all subjects. Multislice computed tomographic scans were obtained before RME (T0), at the end of the active expansion phase (T1), and after a retention period of 6 months following expansion removal (T2). Measurements were performed on the scanned images at the dental and periodontal levels and were repeated after a period of one month; the mean values of the two measurements were used for fi nal analysis. The mean differences in measurements at T0, T1, and T2 were examined with Friedman ANOVA for repeated measures with post hoc tests. Wilcoxon’s ranked sum test was used when only two consecutive observations were performed (T0-T2). The level of signifi cance was P < 0.05. RESULTS: All interdental transverse measurements signifi cantly increased at both T1 and T2 with respect to T0, with a high prevalence rate of translatory movement of the teeth. In evaluation of T0-T1 changes, periodontal measurements were statistically signifi cant on the buccal aspect of banded teeth with a reduction in alveolar bone thickness corresponding to the mesial (–0.5 mm; P < 0.05) and distal (–0.4 mm; P < 0.05) roots of the right fi rst molar, and to the mesial root of the left fi rst molar (–0.3 mm; P < 0.05). In evaluation of the T1-T2 changes, and of overall T0-T2 changes, the lingual bone plate thickness of both fi rst molars was signifi cantly increased (+0.6 mm; P < 0.05). No signifi cant differences at the alveolar crest level were present at T2 when compared with T0. CONCLUSION: RME therapy induces a signifi cant increase in the transverse dimension of the maxillary arch in growing subjects without any permanent damage to the periodontal bony support of anchoring teeth.

Low-dose computed tomographic evaluation of dental and periodontal effects of rapid maxillary expansion / R. Lione; F. Ballanti; P. Cozza; L. Franchi; T. Baccetti. - In: EUROPEAN JOURNAL OF ORTHODONTICS. - ISSN 1460-2210. - STAMPA. - 30:(2008), pp. e116-e116.

Low-dose computed tomographic evaluation of dental and periodontal effects of rapid maxillary expansion.

FRANCHI, LORENZO;BACCETTI, TIZIANO
2008

Abstract

AIM: To evaluate, by means of a low-dose computed tomography protocol, the dental and periodontal changes associated with rapid maxillary expansion (RME) at the end of the active phase and after 6 months of retention in a group of growing patients. SUBJECTS AND METHOD: Seventeen Caucasian children (7 males, 10 females), with a mean age at the fi rst observation of 11.2 years (range 8-14 years), and with cervical vertebral maturation stages ranging from CS1 to CS3 (pre-pubertal or pubertal) as assessed on lateral cephalograms. Each patient underwent a standardized protocol with RME. The expansion screw was activated twice a day for 14 days, thus reaching the total amount of expansion of 7 mm in all subjects. Multislice computed tomographic scans were obtained before RME (T0), at the end of the active expansion phase (T1), and after a retention period of 6 months following expansion removal (T2). Measurements were performed on the scanned images at the dental and periodontal levels and were repeated after a period of one month; the mean values of the two measurements were used for fi nal analysis. The mean differences in measurements at T0, T1, and T2 were examined with Friedman ANOVA for repeated measures with post hoc tests. Wilcoxon’s ranked sum test was used when only two consecutive observations were performed (T0-T2). The level of signifi cance was P < 0.05. RESULTS: All interdental transverse measurements signifi cantly increased at both T1 and T2 with respect to T0, with a high prevalence rate of translatory movement of the teeth. In evaluation of T0-T1 changes, periodontal measurements were statistically signifi cant on the buccal aspect of banded teeth with a reduction in alveolar bone thickness corresponding to the mesial (–0.5 mm; P < 0.05) and distal (–0.4 mm; P < 0.05) roots of the right fi rst molar, and to the mesial root of the left fi rst molar (–0.3 mm; P < 0.05). In evaluation of the T1-T2 changes, and of overall T0-T2 changes, the lingual bone plate thickness of both fi rst molars was signifi cantly increased (+0.6 mm; P < 0.05). No signifi cant differences at the alveolar crest level were present at T2 when compared with T0. CONCLUSION: RME therapy induces a signifi cant increase in the transverse dimension of the maxillary arch in growing subjects without any permanent damage to the periodontal bony support of anchoring teeth.
2008
R. Lione; F. Ballanti; P. Cozza; L. Franchi; T. Baccetti
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/777346
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