Objective:The purpose of this study was to evaluate three-dimensional(3D) dehiscence of upper anterior alveolar bone during incisor retraction and intrusion in adult patients with maximum anchorage.Methods:Twenty adul...Objective:The purpose of this study was to evaluate three-dimensional(3D) dehiscence of upper anterior alveolar bone during incisor retraction and intrusion in adult patients with maximum anchorage.Methods:Twenty adult patients with bimaxillary dentoalveolar protrusion had the four first premolars extracted.Miniscrews were placed to provide maximum anchorage for upper incisor retraction and intrusion.A computed tomography(CT) scan was performed after placement of the miniscrews and treatment.The 3D reconstructions of pre-and post-CT data were used to assess the dehiscence of upper anterior alveolar bone.Results:The amounts of upper incisor retraction at the edge and apex were(7.64±1.68) and(3.91±2.10) mm,respectively,and(1.34±0.74) mm of upper central incisor intrusion.Upper alveolar bone height losses at labial alveolar ridge crest(LAC) and palatal alveolar ridge crest(PAC) were 0.543 and 2.612 mm,respectively,and the percentages were(6.49±3.54)% and(27.42±9.77)%,respectively.The shape deformations of LAC-labial cortex bending point(LBP) and PAC-palatal cortex bending point(PBP) were(15.37±5.20)° and(6.43±3.27)°,respectively.Conclusions:Thus,for adult patients with bimaxillary protrusion,mechanobiological response of anterior alveolus should be taken into account during incisor retraction and intrusion.Pursuit of maximum anchorage might lead to upper anterior alveolar bone loss.展开更多
Dear Editor,Actins are a family of essential cytoskeletal proteins involved in nearly all cellular processes（Lambrechts et al.,2004）.Of the six human genes that encode actins,only ACTG1and ACTB are ubiquitously expr...Dear Editor,Actins are a family of essential cytoskeletal proteins involved in nearly all cellular processes（Lambrechts et al.,2004）.Of the six human genes that encode actins,only ACTG1and ACTB are ubiquitously expressed.ACTG1（OMIM#604717）,which is linked to the DFNA20/26 locus,wasidentified in autosomal dominant, non-syndromic hearing loss （NSHL） cases （Baek et al., 2012; Liu et al., 2008; Park et al., 2013; Yuan et al., 2016）. In addition, some ACTG1 （OMIM #614583） mutations are associated with Baraitser-Winter syndrome, which is characterized by developmental delay, facial dysmorphologies, brain malformations, colobomas, and variable hearing loss （Riviere et al., 2012）.展开更多
基金Project supported by the Shandong Science and Technology Planning Project Contract Research (Nos. 2008GG30002019 and 2008GG 30001001) of Chinathe Shandong University Dental School Project Research (Nos. P2009009,P2009010,and P2010010),China
文摘Objective:The purpose of this study was to evaluate three-dimensional(3D) dehiscence of upper anterior alveolar bone during incisor retraction and intrusion in adult patients with maximum anchorage.Methods:Twenty adult patients with bimaxillary dentoalveolar protrusion had the four first premolars extracted.Miniscrews were placed to provide maximum anchorage for upper incisor retraction and intrusion.A computed tomography(CT) scan was performed after placement of the miniscrews and treatment.The 3D reconstructions of pre-and post-CT data were used to assess the dehiscence of upper anterior alveolar bone.Results:The amounts of upper incisor retraction at the edge and apex were(7.64±1.68) and(3.91±2.10) mm,respectively,and(1.34±0.74) mm of upper central incisor intrusion.Upper alveolar bone height losses at labial alveolar ridge crest(LAC) and palatal alveolar ridge crest(PAC) were 0.543 and 2.612 mm,respectively,and the percentages were(6.49±3.54)% and(27.42±9.77)%,respectively.The shape deformations of LAC-labial cortex bending point(LBP) and PAC-palatal cortex bending point(PBP) were(15.37±5.20)° and(6.43±3.27)°,respectively.Conclusions:Thus,for adult patients with bimaxillary protrusion,mechanobiological response of anterior alveolus should be taken into account during incisor retraction and intrusion.Pursuit of maximum anchorage might lead to upper anterior alveolar bone loss.
基金supported by the National Natural Science Foundation of China(81530032)the National Key Basic Research Program of China(2014CB943001)
文摘Dear Editor,Actins are a family of essential cytoskeletal proteins involved in nearly all cellular processes（Lambrechts et al.,2004）.Of the six human genes that encode actins,only ACTG1and ACTB are ubiquitously expressed.ACTG1（OMIM#604717）,which is linked to the DFNA20/26 locus,wasidentified in autosomal dominant, non-syndromic hearing loss （NSHL） cases （Baek et al., 2012; Liu et al., 2008; Park et al., 2013; Yuan et al., 2016）. In addition, some ACTG1 （OMIM #614583） mutations are associated with Baraitser-Winter syndrome, which is characterized by developmental delay, facial dysmorphologies, brain malformations, colobomas, and variable hearing loss （Riviere et al., 2012）.
