[Effects of micro-arc oxidation on the biological behaviors of MC3T3-E1 cells on titanium].

Purpose: This study was intended to modify the surface of pure titanium by micro-arc oxidation (MAO), and to investigate the effects of MAO process on the biological behavior of MC3T3-E1 osteoblastic cells.

Methods: MAO treatment of specimens were carried out using a staggered voltage boost procedure. The surface topography of the prepared specimens were observed by field emission scanning electron microscopy.

[Treatment effects of the maxillary protraction in correction of maxillary deficiency: a comparative study between RPE group and no RPE group.].

Purpose: To compare the clinical effects of rapid palatal expansions combined with maxillary protractions to that of maxillary protractions of the maxillary deficiency alone.

Methods: Twenty patients aging from 9 to 11 years were divided into two groups , each group had 10 patients. All patients were diagnosed as having deficient maxillas with anterior crossbite.