ABSTRACT
BACKGROUND: Currently, the topic of dental implants is widely researched. However, still compromising are the factors that can affect implant loss as a consequence of marginal bone loss. One of the factors is smoking, which has a devastating effect on human health and bone structure. Oral health and jaw condition are also negatively affected by smoking. The aim of this study was to evaluate the peri-implant jawbone corticalization phenomenon in tobacco smokers. METHODS: A total of 2196 samples from 768 patients with an implant in the neck area were checked, and texture features were analyzed. The corticalization phenomenon was investigated. All analyses were performed in MaZda Software. The influence of corticalization was investigated as a factor on bone structure near the implant neck. The statistical analysis included a feature distribution evaluation, mean (t-test) or median (W-test) comparison, analysis of regression and one-way analysis of variance or Kruskal-Wallis test as no normal distribution or between-group variance was indicated for the significant differences in the investigated groups. Detected differences or relationships were assumed to be statistically significant when p < 0.05. RESULTS: The research revealed that MBL was correlated with smoking after 5 years (0.42 mm ± 1.32 mm 0 mm ± 1.25 mm), the Corticalization Index was higher in the smoker group on the day of surgery, and it became higher after 5y of observation (185.98 ± 90.8 and 243.17 ± 155.47). The implant-loss frequency was higher in the group of smokers, too, compared to non-smokers (6.74% and 2.87%). The higher the torque value during the implant placement, the higher the Corticalization Phenomenon Index. CONCLUSIONS: The research revealed a correlation between smoking and changes in bone structure in radio textures near the implants. The corticalization phenomenon is important, may be detected immediately after implant placement and may be one of the indicators of the implant success rate.
ABSTRACT
Aim: Comparison of injuries to the facial and cerebral parts of the skull causing death and grievous bodily harm, resulting solely from punches to the facial area of the skull. Assessment and confrontation of both groups in terms of the final criminal-legal classification of the perpetrator's acts. Review of reasons for court judgements with a focus on the subjective elements of the prohibited act. Attempt to verify the hypothesis assuming that death or grievous bodily harm can be caused by a single punch to the facial part of the skull. Material and methods: Final judgements passed by criminal divisions of common courts of law in cases where death or grievous bodily harm was caused by injuries to the facial and cerebral parts of the skull resulting solely from punches to the facial area of the skull. Assessment of individual cases within each group to determine similarities and differences. Comparative analysis of both groups. Results: The cause of death in cases involving injuries to the facial part of the skull was rapid suffocation following blood aspiration into the respiratory tract. However, the criminal-legal classification of the perpetrators' actions in these cases was varied. In one case, death resulted from injuries to the cerebral part of the skull, which are extremely rare as a result of a punch to the facial area within the skull. Grievous bodily harm was due to the loss of vision in the eye, typically due to eyeball rupture. Conclusions: Even though the circumstances of the injuries were similar, different mechanisms were responsible for causing death and grievous bodily harm in the victims. The most severe consequences (death and grievous bodily harm) were not caused by injuries of the same type in any of the cases studied. A single punch to the facial part of the skull may be enough to lead to either grievous bodily harm or death, but the criminal-legal assessment of punching to the face can vary greatly.
ABSTRACT
PURPOSE: The aim of this prospective study was to evaluate parathyroid hormone serum level as a potential single factor of bone metabolism around dental implants. MATERIALS AND METHODS: Parathyroid hormone levels were measured before implantation. Intraoral digital radiographs were taken in standardized conditions in all cases: immediately after implantation, immediately after functional loading, and 3, 6, 9, 12, 18, and 24 months after functional loading. The next phase was to align all radiographs geometrically. Two regions of interest were marked in the bone image: one in the implant neck region and another in the periapical region. Next, the entropy of the microarchitecture of the bone image was calculated, and an analysis of simple regression was performed. RESULTS: The prospective study included 107 patients of both sexes in the age range of 17 to 67 years (mean ± SD: 45.53 ± 12.1 years). A significant relationship was observed between higher levels of parathyroid hormone (but still in the normal range) and the decrease of textural entropy in the alveolar ridge bone at 3, 6, 12, and 18 months after functional loading. However, in the periods immediately after implantation, immediately after functional loading, and 9 and 24 months after functional loading, the relationship was not statistically significant. CONCLUSION: Assessment of the parathyroid hormone serum level can be considered a useful method to predict bone condition around a dental implant, but not as a single factor.
