ObjectiveThe objective of this study was to evaluate the effects of the secondhand smoking in the trabecular bone micro-architecture of the mandible of rats, offsprings of passive smoking matrices. Materials and MethodsFifty-five rats, Rattus norvegicus albinus, offsprings of passive smoking and non-passive smoking matrices, were divided into three groups: continuous smoking offsprings (CSO), interrupted smoking offsprings (ISO) and non-smoking offsprings (NSO/control). After the 21 st , 42 nd , 63 rd and 128 th days, the mandibles were analyzed by microcomputer tomography(micro-CT). Images of inter-radicular alveolar bone of the mandibular first molars underwent three-dimensional reconstruction and were analyzed. The bone volume fraction (BV/TV, bone volume/total volume), the trabecular thickness (Tb.Th), the trabecular spacing (Tb.Sp), the trabecular number (Tb.N) and the structure model index (SMI) were analyzed. ResultsThe BV/TV analysis revealed increase of the average values in the CSO group, at 21 st and 42 nd days (p=0,0124), tending to decrease related to the mean from the 42 nd day. The animals of ISO group did not show significant difference in BV/TV, about the control group (p=0,9751). The results of Tb.Th were different and significant during all the experimental period among the three groups: CSO and control (p<0,0001), ISO and control (p=0,0030) and CSO / ISO (p=0,0020). About Tb.Sp, the differences were not significant among the three groups. About Tb.N, the difference was significant into each group, with increasing values (p<0.0001). The SMI showed significant difference between the CSOs and control, CSO and ISO, both with (p<0,0001). The difference between control and ISO group was not significant (p=0,1253). ConclusionThe passive inhalation of cigarette smoke by the offsprings of smoking matrices had a harmful effect in the micro-archicteture of the trabecular bone of the rats' mandible in developing. About the ISO groups, the recovery of the micro-archicteture occurred partially.
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