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Heo, Yoon-Young,Cho, Keun-Chul,Baek, Seung-Hak Angle Orthodontists Research and Education Foundat 2012 The Angle orthodontist Vol.82 No.5
<P>To investigate the effects of orthodontic mini-implant (OMI) shape and angled-predrilling depth on the mechanical properties of OMIs during the angled insertion procedure.</P>
In vitro and in vivo mechanical stability of orthodontic mini-implants.
Cho, Il-Sik,Kim, Sung-Kyun,Chang, Young-Il,Baek, Seung-Hak Angle Orthodontists Research and Education Foundat 2012 The Angle orthodontist Vol.82 No.4
<P>To compare in vivo and in vitro mechanical stability of orthodontic mini-implants (OMIs) treated with a sandblasted, large-grit, and anodic-oxidation (SLAO) method vs those treated with a sandblasted, large-grit, and acid-etching (SLA) method.</P>
Mechanical properties of self-drilling orthodontic micro-implants with different diameters.
Chen, Yan,Kyung, Hee Moon,Gao, Limin,Yu, Won-Jae,Bae, Eun-Ju,Kim, Sang-Min Angle Orthodontists Research and Education Foundat 2010 The Angle orthodontist Vol.80 No.5
<P>OBJECTIVE: The hypothesis to be tested is that peak-insertion torque of self-drilling micro-implants of an appropriate diameter correlates with peak-removal torque mechanically. MATERIALS AND METHODS: A total of 360 self-drilling micro-implants composed of five different types were used. They (24 of each group) were inserted in three types of artificial bone with the use of a driving torque tester at a speed of 15 rpm. Insertion torque was measured during the placement, while the removal torque was measured within 3 days after insertion. RESULTS: Most of the micro-implants in type A sheared before they were completely inserted in 40-pounds per cubic foot bone. The implants in other types were successfully inserted without implant breakage and bone fracture in all bone densities. There was a statistically significant correlation between insertion torque and removal torque (r > or = 0.43543, P = .0001). There were significant differences in insertion and removal torque among the diameters of implants and bone densities with an increasing tendency. The torque loss rates reduced as the diameter of the implant and bone density increased. CONCLUSIONS: Micro-implants with a diameter of less than 1.3 mm are unsuitable for insertion into a bone with a density greater than 40 pounds per cubic foot mechanically when one is using a self-drilling technique.</P>
Kim, Seung-Jae,Choi, Jin-Young,Baek, Seung-Hak Angle Orthodontists Research and Education Foundat 2012 The Angle orthodontist Vol.82 No.6
<P>To compare the effect of canting correction in anterior maxillary transverse occlusal planes (AMTOP) and posterior maxillary transverse occlusal planes (PMTOP) on the change of lip canting (LC) in two-jaw surgery (TJS) cases.</P>
Ahn, Hyo-Won,Kim, Keun-Woo,Yang, Il-Hyung,Choi, Jin-Young,Baek, Seung-Hak Angle Orthodontists Research and Education Foundat 2012 The Angle orthodontist Vol.82 No.5
<P>To determine the difference in the effects of facemask with miniplate (FM-MP) anchorage on maxillary protraction in growing cleft patients between unilateral (UCLP) and bilateral cleft lip and palate (BCLP) groups.</P>
Cho, Keun-Chul,Baek, Seung-Hak Angle Orthodontists Research and Education Foundat 2012 The Angle orthodontist Vol.82 No.4
<P>To investigate the effects of orthodontic mini-implant (OMI) shape and predrilling depth on the mechanical properties of OMIs during the insertion procedure.</P>
Seo, Yu-Jin,Park, Ji-Wan,Kim, Young Ho,Baek, Seung-Hak Angle Orthodontists Research and Education Foundat 2011 The Angle orthodontist Vol.81 No.6
<P>To test the null hypothesis that there is no significant difference in the initial growth pattern among three cleft types before alveolar bone graft (ABG) according to cleft type (unilateral cleft lip and alveolus [UCLA], unilateral cleft lip and palate [UCLP], and cleft palate [CP]).</P>
Lee, Seung-Pyo,Lee, Shin-Jae,Lim, Bum-Soon,Ahn, Sug-Joon Angle Orthodontists Research and Education Foundat 2009 The Angle orthodontist Vol.79 No.2
<P>OBJECTIVE: To test the hypothesis that there are no significant differences in the adhesion of mutans streptococci (MS) to various orthodontic materials based on their surface characteristics. MATERIALS AND METHODS: Surface roughness (SR) and surface free energy (SFE) characteristics were investigated for nine different orthodontic materials (four orthodontic adhesives, three bracket raw materials, hydroxyapatite blocks, and bovine incisors) using confocal laser scanning microscopy and sessile drop method. Each material, except the bovine incisors, was incubated with whole saliva or phosphate-buffered saline for 2 hours. Adhesion assays were performed by incubating tritium-labeled MS with each material for 3 or 6 hours. RESULTS: Orthodontic adhesives had higher SFE characteristics and lower SR than bracket materials. Orthodontic adhesives showed a higher MS retaining capacity than bracket materials, and MS adhesion to resin-modified glass ionomer and hydroxyapatite was highest. Extended incubation time increased MS adhesion, while saliva coating did not significantly influence MS adhesion. SFE, specifically its dispersive and polar components, was positively correlated with MS adhesion, irrespective of saliva coating. CONCLUSIONS: The hypothesis is rejected. This study suggests that SFE characteristics play an important role in the initial MS adhesion to orthodontic materials.</P>