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. 2014 May-Jun;19(3):36-43.
doi: 10.1590/2176-9451.19.3.036-043.oar.

Immediate periodontal bone plate changes induced by rapid maxillary expansion in the early mixed dentition: CT findings

Daniela Gamba Garib, Maria Helena Ocké Menezes, Omar Gabriel Silva Filho, Patricia Bittencourt Dutra Santos

Immediate periodontal bone plate changes induced by rapid maxillary expansion in the early mixed dentition: CT findings

Daniela Gamba Garib et al. Dental Press J Orthod. 2014 May-Jun.

Abstract
in English, Portuguese

Objective: This study aimed at evaluating buccal and lingual bone plate changes caused by rapid maxillary expansion (RME) in the mixed dentition by means of computed tomography (CT).

Methods: The sample comprised spiral CT exams taken from 22 mixed dentition patients from 6 to 9 years of age (mean age of 8.1 years) presenting constricted maxillary arch treated with Haas-type expanders. Patients were submitted to spiral CT scan before expansion and after the screw activation period with a 30-day interval between T1 and T2. Multiplanar reconstruction was used to measure buccal and lingual bone plate thickness and buccal bone crest level of maxillary posterior deciduous and permanent teeth. Changes induced by expansion were evaluated using paired t test (p < 0.05).

Results: Thickness of buccal and lingual bone plates of posterior teeth remained unchanged during the expansion period, except for deciduous second molars, which showed a slight reduction in bone thickness at the distal region of its buccal aspect. Buccal bone dehiscences were not observed in the supporting teeth after expansion.

Conclusions: RME performed in mixed dentition did not produce immediate undesirable effects on periodontal bone tissues.

Objetivo: o presente estudo teve como objetivo avaliar alterações das tábuas ósseas vestibulares e linguais decorrentes da expansão rápida da maxila (ERM), em pacientes na dentição mista, por meio de tomografia computadorizada (TC).

Métodos: a amostra foi constituída por exames de TC helicoidal, realizados de 22 pacientes com dentição mista, dos 6 aos 9 anos de idade (média de 8,1 anos), com atresia maxilar, tratados com expansores do tipo Haas. Os pacientes foram submetidos a tomografia computadorizada helicoidal antes da expansão e após o período de ativação de parafuso expansor, com 30 dias de intervalo entre as fases T1 e T2. A reconstrução multiplanar foi usada para medir a espessura da tábua óssea vestibular e lingual e a altura da crista óssea alveolar dos dentes posteriores decíduos e dos dentes permanentes. As alterações induzidas pela expansão foram avaliadas usando o teste t pareado (p < 0,05).

Resultados: a espessura das tábuas ósseas vestibular e lingual dos dentes posteriores permaneceu inalterada durante o período de expansão, com exceção dos segundos molares decíduos, que mostraram uma ligeira redução da espessura do osso na região distal. Deiscências ósseas vestibulares não foram observadas nos dentes de suporte após a expansão.

Conclusão: a ERM, realizada na dentição mista, não produziu efeitos imediatos indesejáveis sobre os tecidos ósseos periodontais.

Keywords: Palatal expansion technique; Periodontium; Spiral computed tomography.

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Figures

Figure 1
Figure 1
Haas-type expander used in this study.
Figure 2
Figure 2
Measurements of buccal and lingual bone plate thickness (BBPT and LBPT) of permanent erupted and non-erupted posterior teeth were performed in the axial section, parallel to the palatal plane, passing at the level of right maxillary permanent first molar furcation.
Figure 3
Figure 3
Measurements of buccal and lingual bone plate thickness (BBPT and LBPT) of deciduous posterior teeth were performed in the axial section, parallel to the palatal plane, passing at the level of right maxillary deciduous second molar furcation.
Figure 4
Figure 4
Measurement of maxillary posterior teeth buccal alveolar crest level. BACL: buccal alveolar crest level measured from the buccal cusp tip to the buccal alveolar crest.
See this image and copyright information in PMC

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