人类上颌中切牙拔除后牙槽骨外形变化的研究

Abstract

Abstract:The purpose of this study was to apply cone-beam computed tomography (CBCT) to observe contour changes in human alveolar bone after tooth extraction of the maxillary central incisor and to provide original morphological evidence for aesthetic implant treatment in the maxillary anterior area. Forty patients were recruited into the study. Each patient had two CBCT scans (CBCT I and CBCT II), one taken before and one taken three months after tooth extraction of maxillary central incisor (test tooth T). A fixed anatomic reference point was used to orient the starting axial slice of the two scans. On three CBCT I axial slices, which represented the deep, middle, and shallow layers of the socket, labial and palatal alveolar bone widths of T were measured. The number of sagittal slices from the start point to the pulp centre of T was recorded. On three CBCT II axial slices, the pulp centres of extracted T were oriented according to the number of moved sagittal slices recorded in CBCT I. Labial and palatal alveolar bone widths at the oriented sites were measured. On the CBCT I axial slice which represented the middle layer of the socket, sagittal slices were reconstructed. Relevant distances of T on the sagittal slice were measured, as were the alveolar bone width and tooth length of the opposite central incisor. On the CBCT II axial slice, which represented the middle layer of the socket, relevant distances recorded in CBCT I were transferred on the sagittal slice. The height reduction of alveolar bone on labial and palatal sides was measured, as were the alveolar bone width and tooth length of the opposite central incisor at the oriented site. Intraobserver reliability assessed by intraclass correlation coefficients (ICCs) was high. Paired sample t-tests were performed. The alveolar bone width and tooth length of the opposite central incisor showed no statistical differences (P<0.05). The labial alveolar bone widths of T at the deep, middle, and shallow layers all showed statistical differences. However, no palatal alveolar bone widths showed any statistical differences. The width reduction of alveolar bone was 1.2, 1.6, and 2.7 mm at the deep, middle, and shallow layers, respectively. The height reduction of alveolar bone on labial and palatal sides of T both showed statistical differences, which was 1.9 and 1.1 mm, respectively.

Concentrated growth factor exudate enhances the proliferation of human periodontal ligament cells in the presence of TNF‑α

“…CGF is a third-phase plasma extract, consisting of multiple growth factors (4–8). Due to the unique structure of CGF fibrin, it can replace the diaphragm used in guiding bone regeneration to a certain extent (8,9,15). CGF has been widely studied in the fields of oral implantation, extraction site preservation, jaw cyst treatment, and fracture healing promotion (4–8,16,17).…”

Avaliação comparativa dimensional longitudinal do rebordo alveolar pós exodontia, com modalidades cirúrgicas distintas: convencional x com dispositivo minimamente traumático

“…Dessa forma, tem-se uma evidência científica mais clara, já que animais como cães ou ratos podem trazer diferenças anatômicas, fisiológicas e metabólicas (IASELLA et al, 2003;SCHROPP et al, 2003; MOYA-VILLAESCUSA; SÁNCHEZ-PÉREZ, 2010;BARONE et al, 2012;LAMBERT et al, 2012;FARMER;DARBY, 2013;MUSKA et al, 2013;THALMAIR, 2013;LI, WANG, 2014;KARACA et al, 2015).…”

“…Com respeito à análise radiográfica, presente na grande maioria da literatura consultada (LEKOVIC et al, 1998;CAMARGO et al, 2000;SCHROPP et al, 2003;FIORELLINI et al, 2005;BARONE et al, 2008;LAMBERT et al, 2012;LI;WANG, 2014), é importante lembrar de princípios básicos de radiologia e somente expor o paciente à dose mínima necessária.…”

“…Exames de imagem, como a Tomografia Computadorizada Cone Beam, podem ser interessantes para um estudo clínico (LI;WANG, 2014;KARACA et al, 2015), entretanto, a dose de radiação bastante superior não justifica o seu uso e, dessa forma, foi descartada neste estudo.…”

Avaliação da alteração óssea dimensional pós-exodontia e planejamento virtual 3D em dentes anteriores superiores através da técnica de tomografia computadorizada de feixe cônico (TCFC)

“…Além disso, permite a visualização de tecidos mole e duro e de ambos os lados do paciente numa mesma aquisição de imagem (ICRP, 1991;Barriviera et al, 2009). Essa técnica tem sido utilizada em investigações com humanos para mensurar as alterações dimensionais ósseas pós-exodontia (Chappuis et al, 2013;Li;Misawa et al, 2016). No entanto, mais estudos sobre este assunto são necessários, com objetivo de compreender melhor as alterações dimensionais na zona estética, ou seja: na região superior anterior.…”