Comparative study of the effect of different temperatures on bovine bone used for bone repair of critical calvaria defects in rats.

To evaluate the osteoconductive potential of inorganic biomaterials of bovine origin submitted to different temperatures in the bone repair of critical defects in rat calvaria. Forty-eight rats were divided into four groups according to the material used to fill the defect: control group (GC), the defect was filled only with blood clot (n = 12); GBO, defect filled with Bio-Oss®, deproteinzed at 300°C (n = 12); GOX, defect filled with Inorganic GenOx®, deproteinzed from 850 to 1200°C (n = 12) and G700, defect filled with Inorganic GenOx 700, deproteinzed at 700°C (n = 12). In each animal's calvaria, a trephine bur with 5 mm internal diameter was used to produce a 6 mm-diameter central defect. Gen Derm® resorbable bovine membrane was superimposed over all defects. Subsequently, animals were euthanized at 30 and 60 days after surgery. The pieces were sent for histological and histometric analysis to evaluate the following variables: bone neoformation, presence of biomaterial, mononuclear and polymorphonuclear leukocytes, presence of other tissues (granulation and medullary) and maturation of collagen fibers. The most representative group for bone neoformation was GC. At 30 days, there was a higher mean of mature bone tissue (75.8). At 60 days, there was no statistical difference between the GC (64.9), GBO (32.9), GOX (45.3), and G700 (26.6) groups. GBO presented the highest amount of biomaterial after 30 days (115.9) and 60 days (118.5). All bovine biomaterials were biocompatible and osteoconductive. GOX promoted the best bone repair of the studied materials.

Successful Osseointegrated Implants in Hypertensive Patients: Retrospective Clinical Study.

PURPOSE: The aim of this study was to investigate the association of hypertension and antihypertensive drugs with the failure of osseointegrated dental implants. MATERIALS AND METHODS: This study conformed to STROBE Guidelines regarding retrospective studies. Data from 602 medical records of patients who received rehabilitation treatment with osseointegrated implants between 2000 and 2017, completed at least 6 months before the study, were analyzed. Data on age, sex, presence or absence of hypertension, use or not of antihypertensive drugs, number of placed and lost implants, and type of prosthetic rehabilitation were collected. Statistical chi-square tests and the Fisher exact test were used to analyze the variables with implant loss, using a significance level of P < .05. RESULTS: One thousand eight hundred eighty-seven implants were placed with a success rate of 97.51% (47 implants lost in 41 patients). Of the 602 patients, 71.43% (432) were normotensive and 28.36% (171) were hypertensive. The success rate of implants in the normotensive group was 93.28%, and in the hypertensive group, it was 92.99%, with no statistical difference between the groups (P = .958). Of these patients, the success rate among the hypertensive group was similar for medication users (92.5%) and for nonusers (94.1%), with no statistically significant difference (P = .939). CONCLUSION: The presence of hypertension, as well as the use of antihypertensives, could not be associated with the failure of osseointegrated implants.

A influência do fumo na reabilitação com implantes osseointegrados: revisão de literatura / The influence of smoking on rehabilitation of osseointegration implants: a literature review

O fumo é um forte indicador de risco para implantes osseointegrados e os insucessos estão relacionados com as fases envolvidas durante o processo de reparo e Osseointegração, além da sobrevida dos implantes em decorrência do aumento da incidência de peri-implantite e mucosite peri-implantar, e como consequência em alguns casos a perda do implante. A nicotina representa a substância de maior expressão e toxicidade nos cigarros sobre os tecidos da cavidade oral. Assim, o presente estudo tem por objetivo revisar a literatura associando a influência e o risco do tabagismo à importância da saúde peri-implantar para previsibilidade do tratamento. Há estudos que também concluíram que o fumo aumenta o risco de peri-implantite e perda óssea peri-implantar. Assim, podemos concluir que o tabaco influencia negativamente na osseointegração e sobrevida dos implantes de titânio, devido aos efeitos citotóxicos das suas substâncias.

Smoke is one of the main factors on the Osseointegrated implants failure. The cases of nonsuccess are related to the phases involved in the osseointegration procedure, also the survival rate of the implants diminish in occasion of increased gingivitis, peri-implantitis, consequently generating the loss of the implant. Nicotine is the most representative substance in cigarettes, thus many of the subsequent effects on the body are related to it. Along these lines the present study intends to review literature associating the influence of smoking and its effects on patients with severe generalized chronic periodontitis. The literature review showed that periodontal tissues health is very important to the osseointegration, because the cases of peri-implantitis identified in patients with previous periodontitis are common.There are also studies that concluded that smoking raises the risk of peri-implantitis and peri-implant bone loss. However, recent systematic revisions have not demonstrated significant difference in the implant failure among smokers and non-smokers. Yet, there are in literature enough scientific data that prove the negative effects of nicotine and smoking in the process of tooth repair and its many phases. Therefore, inside the limits of this study and considering the material addressed in the literature review, it is possible to conclude that tobacco has negative influence on osseointegration and the survival rate of titanium implants.