ABSTRACT
OBJECTIVES: To evaluate the effect of Cisplatin on bone repair and mineralization around implants and on the mechanical properties of bone tissue. MATERIALS AND METHODS: Forty-three Wistar rats were randomly divided into two groups: Cisplatin (CIS, medication) and control (CTL, placebo solution), administered once a week for 4 weeks. After 4 weeks, implants were installed in both tibiae metaphysis. After 30 and 60 days, the animals were sacrificed and their femurs and tibiae were removed. Femurs were subjected to mechanical tests and tibiae for removal torque, arrangement and distribution of collagen fibers, morphometrical analyses (bone tissue in contact with the implant surface [BIC] and areal fraction between implant threads occupied by bone tissue [BAFO]) and scanning electron microscopy to calcium and calcium/phosphorus analysis. Data were analyzed by ANOVA or MANOVA, and Tukey or Games-Howell post hoc tests, respectively (α = 0.05). RESULTS: The CTL specimens had significantly higher values (0.0001 ≤ p≤0.036) of strength (N), removal torque (N/cm2 ), %BIC, and %BAFO than CIS specimens, being their best results at day 60. No significant differences were found among the groups regarding the values of deformation, percentage of calcium, and calcium/phosphorus ratio. In CIS groups, there was a reduction in the organization of collagen at the bone/implant interface, resulting in a trabecular bone with thin trabeculae and birefringent collagen and irregular arrangement. CONCLUSIONS AND CLINICAL IMPLICATIONS: Cisplatin interfered negatively in the repair and mineralization around dental implants, as well as on the quality of the bone tissue, mainly in the period of 30 days after the implant placement.
Subject(s)
Dental Implants , Osseointegration , Animals , Cisplatin , Rats , Rats, Wistar , Surface Properties , Tibia , Titanium , TorqueABSTRACT
Introduction: The dental patient's anxiety and expectation may significantly alter their vital signs. The use of local anesthetics associated with a vasoconstrictor may also alter the vital signs of these patients, promoting hemodynamic changes that may result in emergency situations. Objective: To evaluate the influence of anxiety of patients submitted to third molar extraction and the use of different anesthetic substances with adrenaline on their vital signs (oxygen saturation, heart rate, and systolic and diastolic blood pressure) in different moments. Material and method: Forty patients answered the questionnaire of the Dental Anxiety Scale (Corah's Scale) and fear (KleinKnecht's Scale) and were submitted to third molar extraction in two surgical times for the use of articaine or mepivacaine, both associated with adrenaline. The results were analyzed by ANOVA followed by Tukey post hoc test, Student's t test, and Pearson's correlation coefficients (α=0.05). Result: There was no significant differences in saturation or heart rate. The blood pressure showed significant variations during time for both anesthetics, however mepivacaine resulted in a longer postoperative time to restore blood pressure. Patients with high or moderate anxiety and high fear index were those who had positive correlations with the highest blood pressure values. Conclusion: Anxiety and fear positively influence the increase in blood pressure. Mepivacaine promoted a greater resistance to the return of normal vital signs, especially blood pressure levels.
Introdução: A ansiedade e a expectativa do paciente odontológico podem alterar de forma significativa seus sinais vitais. Da mesma forma, o uso de anestésico local associado a um vasoconstrictor também alteram os sinais vitais desses pacientes, promovendo alterações hemodinâmicas que podem resultar em situações de emergência. Objetivo: Avaliar a influência da ansiedade de pacientes submetidos à exodontia de terceiros molares e do uso de diferentes substâncias anestésicas com adrenalina sobre seus sinais vitais (saturação de oxigênio, pulsação e pressão arterial sistólica e diastólica) em diferentes momentos operatórios. Material e método: Quarenta pacientes responderam os questionários da Escala de Ansiedade Dentária (Escala de Corah) e de medo (Escala de Kleinknecht) e foram submetidos à exodontia dos terceiros molares em dois tempos cirúrgicos para utilização de articaína ou mepivacaína, ambos associados com adrenalina. Os resultados obtidos foram analisados por ANOVA seguido do teste post hoc de Tukey, t de Student e coeficientes de correlação de Pearson (α=0,05). Resultado: Não houve alteração significativa na saturação nem na frequência cardíaca. A pressão arterial apresentou variações significantes nos tempos aferidos para os dois anestésicos, entretanto a mepivacaína resultou em maior tempo de pós-operatório para o restabelecimento da pressão arterial. Os pacientes com muita ou moderada ansiedade e alto índice de medo foram os que tiveram correlações positivas com os maiores números pressóricos aferidos. Conclusão: A ansiedade e medo influenciam positivamente no aumento da pressão arterial. A mepivacaína promoveu uma maior resistência ao retorno da normalidade dos sinais vitais, especialmente dos níveis pressóricos.
