Vizzotto Mariana Boessio, Rösing Cassiano Kuchenbecker, de Araujo Fernando Borba, Silveira Heloísa Emília Dias da
Department of Surgery and Orthopedics, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Pediatr Dent. 2011 Jul-Aug;33(4):312-5.
The aim of this retrospective follow-up study was to verify the distance between the cementoenamel junction (CEJ) and the alveolar bone crest (ABC) in bitewing radiographs.
Radiographs were digitized and divided into groups by: age, proximal crown surface status (sound→sound and unsound→unsound), tooth, and timing of radiograph. The CEJ-ABC distances were measured on the distal surface of the first primary molar and/or the mesial surface of the second lower primary molar, using the Image Tool software.
The results revealed interactions between the following variables: timing of radiograph-age, age-tooth, timing of radiograph - proximal crown surface status and age- proximal crown surface status. It has been detected that CEJ-ABC distances have significantly increased with time, particularly in terms of assessment of primary lower first molars. However, this increase is greater in unsound when compared to sound surfaces.
This study suggests that an increase in the CEJ-ABC distance is directly associated with aging in a normal periodontium in the primary dentition and that the presence of unsound surfaces can be a risk indicator for the development of alveolar bone loss.
这项回顾性随访研究的目的是在咬合翼片上验证牙骨质釉质界（CEJ）与牙槽嵴顶（ABC）之间的距离。
将X线片数字化，并按年龄、近中牙冠表面状况（完好→完好和有龋坏→有龋坏）、牙齿以及X线片拍摄时间进行分组。使用Image Tool软件在第一乳磨牙远中面和/或下颌第二乳磨牙近中面测量CEJ - ABC距离。
结果显示以下变量之间存在相互作用：X线片拍摄时间 - 年龄、年龄 - 牙齿、X线片拍摄时间 - 近中牙冠表面状况以及年龄 - 近中牙冠表面状况。已检测到CEJ - ABC距离随时间显著增加，尤其是在评估下颌第一乳磨牙时。然而，与完好表面相比，有龋坏表面的增加幅度更大。
本研究表明，在乳牙列正常牙周组织中，CEJ - ABC距离的增加与衰老直接相关，并且有龋坏表面的存在可能是牙槽骨丧失发展的风险指标。
