Fenestração de implantes

Vol. 115 No. 1 January 2013

Detection of periimplant fenestration and dehiscence with the use of two scan modes and the smallest voxel sizes of a cone-beam computed tomography device
Sergio Lins de-Azevedo-Vaz, DDS, MS,a Karla de Faria Vasconcelos, DDS, MS,a Frederico Sampaio Neves, DDS, MS,a Saulo Leonardo Sousa Melo, DDS, MS,a Paulo Sérgio Flores Campos, DDS, MS, PhD,b and Francisco Haiter-Neto, DDS, MS, PhDa
Piracicaba and Salvador, Brazil

Objective. To assess the accuracy of cone-beam computed tomography (CBCT) in periimplant fenestration and dehiscence detection, and to determine the effects of 2 voxel sizes and scan modes. Study Design. One hundred titanium implants were placed in bovine ribs in which periimplant fenestration and dehiscence were simulated. CBCT images were acquired with the use of 3 protocols of the i-CAT NG unit: A) 0.2 mm voxel size halfscan (180°); B) 0.2 mm voxel size full-scan (360°); and C) 0.12 mm voxel size full scan (360°). Receiver operating characteristic curves and diagnostic values were obtained. The Az values were compared with the use of analysis of variance. Results. The Az value for dehiscence in protocol A was significantly lower than those of B or C (P .01). They did not statistically differ for fenestration (P .05). Conclusions. Protocol B yielded the highest values. The voxel sizes did not affect fenestration and dehiscence detection, and for dehiscence full-scan performed better than half-scan. (Oral Surg Oral Med Oral Pathol Oral Radiol 2013;115:121-127)

In the literature it has been seen that it is necessary to have at least 1 mm of bone around the implant if the treatment is to be successful.1 However, unfavorable anatomic conditions can cause insufficient bone volume and result in incorrect positioning of the implant, which leads to the occurrence of complications such as cortical bone defects, including fenestrations and dehiscences. Periimplant dehiscence is characterized by the absence of bone initiating