Eficácia de soluções anestésicas e diferentes condutas clínicas para o manejo de molares inferiores com pulpite irreversível: uma revisão sistematizada da literatura / Efficacy of anesthetic solutions and different clinical approaches for the management of lower molars with irreversible pulpitis: a systematize review of the literature

Objetivo: Dificuldades anestésicas podem decorrer de cenários de infecção e inflamação, como são os casos de pulpite irreversível. Logo, o propósitoda presente revisãosistematizadafoiauxiliar o clínico a alcançar anestesia profunda durante o tratamento de urgência endodôntica de molares mandibulares com pulpite irreversível. Materiais e métodos:Foram selecionados viaPubMed,ensaios clínicos randomizadosrealizados compacientes com pulpite irreversível em molares mandibulares procurando atendimento de urgência. Estes deveriam avaliaro sucesso anestésico através do relato de dor duranteaabertura coronária e/ou instrumentação dos canais radiculares. Dois desfechos primários distintos eram alvo deste estudo (soluções anestésicas e condutas alternativas). Para soluções anestésicas, foram incluídos 18 estudos, e para condutas alternativas, 10 estudos.Revisão de literatura: Diversas estratégias têm sido investigadas para aumentar o percentual de sucesso anestésico, como ouso de técnicas complementares ao bloqueio do nervo alveolar inferior (BNAI), o aumento do volume de anestésico ou do vasoconstritor, o tamponamento das soluções econdutas alternativas.Discussão: Constatou-seque não há diferença na taxa de sucesso no BNAI e para técnicas anestésicas complementares para os diferentes agentes anestésicos. Além disso, a maior concentração de adrenalina, o aumento do volume da solução utilizada, substâncias capazes detamponar a solução anestésica, a administração ou injeção de anti-inflamatórios, a crioterapia e o óxido nitroso também parecem melhoram as taxas de sucesso anestésico.Conclusão:Diversos métodos alternativos parecem promissores para potencializar uma anestesia profunda, e devem ser mais bem investigados para a adoção de parâmetros em prol de seu emprego definitivo.

Aim:Anesthetic difficulties may arise from scenarios of infection and inflammation, as in cases of irreversible pulpitis. Therefore, the purpose of this systematized review was to help the clinician to achieve deep anesthesia during emergency endodontic treatment of mandibular molars with irreversible pulpitis. Materials and methods:Randomized clinical trials performed with patients with irreversible pulpitis in mandibular molars seeking emergency care were selected via PubMed. These should assess anesthetic success by reporting pain during coronary opening and/or instrumentation of root canals. Two distinct primary outcomes were the target of this study (anesthetic solutions and alternative approaches). For anesthetic solutions, 18 studies were included, and for alternative conducts, 10 studies. Literature review:Several strategies have been investigated to increase the percentage of anesthetic success, such as the use of complementary techniques to inferior alveolar nerve block (IANB), increasing the volume of anesthetic or vasoconstrictor, tamponade of solutions and alternative approaches. Discussion:It was found that there is no difference in the success rate for the IANB and for complementary anesthetic techniques for the different anesthetic agents. In addition, higher adrenaline concentration, increased volume of solution used, substances capable of buffering the anesthetic solution, administration or injection of anti-inflammatories, cryotherapy and nitrous oxide also seem to improve anesthetic success rates. Conclusion:Several alternative methods seem promising to potentiate deep anesthesia, and should be better investigated for the adoption of parameters in favor of its definitive use.

Modified abaxial sesamoid nerve block provides enhanced proximal diffusion compared to basisesamoid block and lower proximal diffusion than traditional low plantar nerve block in equine hind limbs: ex vivo and in vivo study.

OBJECTIVE: To determine the proximal diffusion distance of radiopaque contrast medium and mepivacaine/methylene blue solution and incidence of inadvertent intrasynovial and intravascular injections of modified sesamoid nerve block (MASB) when compared with traditional plantar nerve analgesia techniques of the equine distal hind limb. SAMPLE: Ex vivo model: 18 hind limbs; and in vivo model: 5 horses in a crossover study. METHODS: In the ex vivo model, a mepivacaine/methylene blue solution was used to compare the diffusion distance between MASB, basisesamoid block (BSB), and traditional low plantar block (TLPB). Ten minutes after injection, skin was dissected and proximal diffusion distance of the dye patch was measured. In the in vivo model, both hind limbs were injected with radiopaque contrast medium with either MASB or TLPB. Ten minutes after injection, a radiograph was acquired and the proximal diffusion of the contrast medium patch was measured. RESULTS: In the ex vivo model, solution proximal diffusion distance for MASB was significantly longer than BSB (P < .050) and significantly shorter than TLPB (P < .050). Both techniques reached the proximal aspect of DFTS similarly (P = .289), and no difference in the incidence of intrasynovial or intravascular injections was observed (P = .292). In the in vivo model, contrast medium proximal diffusion of MASB was significantly shorter than TLPB (P < .050). The proportion of injections that diffused subcutaneously to the proximal aspect of the proximal pouch of the DFTS was not significantly different between techniques (P = .136). No difference in the incidence of DFTS intrasynovial or intravascular injections was observed (P = .305). CLINICAL RELEVANCE: MASB presented significantly more proximal diffusion than BSB and less proximal diffusion than TLPB, consistently reached the proximal aspect of DFTS, and presented a very low risk of intrasynovial and intravascular injections.

Capsaicin-Cyclodextrin Complex Enhances Mepivacaine Targeting and Improves Local Anesthesia in Inflamed Tissues.

Acidic environments, such as in inflamed tissues, favor the charged form of local anesthetics (LA). Hence, these drugs show less cell permeation and diminished potency. Since the analgesic capsaicin (CAP) triggers opening of the TRPV1 receptor pore, its combination with LAs could result in better uptake and improved anesthesia. We tested the above hypothesis and report here for the first time the analgesia effect of a two-drug combination (LA and CAP) on an inflamed tissue. First, CAP solubility increased up to 20 times with hydroxypropyl-beta-cyclodextrin (HP-ß-CD), as shown by the phase solubility study. The resulting complex (HP-ß-CD-CAP) showed 1:1 stoichiometry and high association constant, according to phase-solubility diagrams and isothermal titration calorimetry data. The inclusion complex formation was also confirmed and characterized by differential scanning calorimetry (DSC), X-ray diffraction, and 1H-NMR. The freeze-dried complex showed physicochemical stability for at least 12 months. To test in vivo performance, we used a pain model based on mouse paw edema. Results showed that 2% mepivacaine injection failed to anesthetize mice inflamed paw, but its combination with complexed CAP resulted in pain control up to 45 min. These promising results encourages deeper research of CAP as an adjuvant for anesthesia in inflamed tissues and cyclodextrin as a solubilizing agent for targeting molecules in drug delivery.

Perfil de utilização de anestésicos locais de uma cidade brasileira com ênfase em diabéticos / Profile of use of local anesthetics in a Brazilian city with emphasis on diabetics

Objetivo: avaliar o conhecimento de cirurgiões-dentistas que trabalham em consultórios particulares de Palmas, Tocantins, quanto à utilização de anestésicos locais em pacientes portadores de diabetes mellitus. Materiais e método: trata-se de um estudo descritivo qualitativo, aprovado pelo Comitê de Ética em Pesquisa da FAMERP de São José do Rio Preto, sob o protocolo 032/2007 e CAAE: 0065.0.000.140-07, respeitando-se a Resolução 466/12, do Conselho Nacional de Saúde. A coleta de dados foi realizada por meio da aplicação de um questionário, utilizando um formulário estruturado. Resultados: de 113 participantes, 47 (41,6%) eram do sexo masculino e 66 (58,4%) do sexo feminino, com idade média de 35 anos. O anestésico mais utilizado pelos cirurgiões-dentistas avaliados foi a lidocaína 2% + adrenalina 1:100.000 (53,1%), o qual também é o mais utilizado para pacientes diabéticos controlados (64,6%). Quanto à variedade de anestésicos, 47,8% dos avaliados relataram possuir somente 3 tipos de anestésicos no consultório e que 83,2% nunca presenciaram nenhum problema decorrente do uso de anestésico. Além disso, 65,5% relataram não participar de cursos para atualização de conhecimentos, sendo que 53,1% mostraram-se insatisfeitos com o ensino de anestesiologia que receberam na graduação. Conclusão: observou-se que os cirurgiões-dentistas do atendimento odontológico particular de Palmas precisam de uma reciclagem profissional, a fim de atualizarem conhecimentos adquiridos na graduação sobre indicação e utilização de anestésicos locais em tratamentos odontológicos de pacientes com necessidades especiais, com ênfase em pacientes portadores de diabetes mellitus.(AU)

Objective: to evaluate the knowledge of dentists who work in private offices in Palmas, Tocantins, regarding the use of local anesthetics in patients with diabetes mellitus. Materials and method: this research is a qualitative descriptive study, approved by the Research Ethics Committee of FAMERP from São José do Rio Preto, under protocol number 032/2007 and CAAE: 0065.0.000.140-07 in compliance with the Resolution 466/12 of the National Health Council. Data collection was performed through the application of a questionnaire, using a structured form. Results: 47 (41.6%) out of 113 participants were male and 66 (58.4%) female, with an average age of 35 years old. The anesthetic most used by the dentists evaluated was lidocaine 2% + adrenaline 1: 100,000 (53.1%) which is also the most used for controlled diabetic patients (64.6%). As for the variety of anesthetics, 47.8% of those evaluated reported having only 3 types of anesthetics in the office and that 83.2% never saw any problems resulting from the use of anesthetics. Furthermore, 65.5% reported not participating in courses to update knowledge and 53.1% were dissatisfied with the teaching of anesthesiology they received during graduation. Conclusion: it was observed that dentists who work in private dental offices in Palmas need a professional retraining in order to update knowledge acquired during graduation on the indication and use of local anesthetics in dental treatments for patients with special needs, with an emphasis on patients with diabetes mellitus.(AU)

Diagnosis and Treatment of Oral Venous Malformation in a Child.

Venous malformations (VMs) are congenital disorders that constitute about 40% of all vascular anomalies. These lesions do not regress spontaneously and may increase in size during childhood. The case of a 10-year-old girl with an extensive oral VM is reported. Intraoral examination revealed the presence of purplish nodules in the alveolar mucosa and gingiva from anterior maxilla. Doppler ultrasound showed a well-defined hypoechoic image and increased vascularization with low blood flow for the alveolar mucosa lesion. The patient was submitted to intralesional injections of the ethanolamine oleate/mepivacaine sclerosing solution. After four sessions, there was a significant reduction of the lesions. However, the patient abandoned the treatment and the oral VM grew progressively. After 1 year, sclerotherapy was resumed and performed weekly. After 10 session of sclerotherapy, the oral VM totally regressed. The childhood is a critical period for oral VM growth. Doppler ultrasound and sclerotherapy can be effective for the management of extensive lesions in children.

Safety of local anesthetics

Abstract Local anesthetics are essential medications for the conduction of dermatological procedures. They stop the depolarization of nerve fibers and are divided into two main categories, the amide and ester types. Systemic toxicity with reflex on the central nervous and cardiovascular systems is their most feared adverse reactions, and the anaphylactic reaction is the most concerning one. Although potentially fatal, these events are extremely rare, so local anesthetics are considered safe for use in in-office procedures.

Safety of local anesthetics.

Local anesthetics are essential medications for the conduction of dermatological procedures. They stop the depolarization of nerve fibers and are divided into two main categories, the amide and ester types. Systemic toxicity with reflex on the central nervous and cardiovascular systems is their most feared adverse reactions, and the anaphylactic reaction is the most concerning one. Although potentially fatal, these events are extremely rare, so local anesthetics are considered safe for use in in-office procedures.

Efeito da mepivacaína 2% nos parâmetros cardiovasculares em cirurgias de terceiros molares / The 2% mepivacaine in the cardiovascular system in third molar surgeries / Efecto de la mepivacaína 2% en los parámetros cardiovasculares en cirugías de terceros molares

Ao serem administrados, os Anestésicos Locais e Vasoconstritores (VC) iniciam os processos de absorção e eliminação, passando pela circulação sanguínea podendo atingir níveis tóxicos ou induzir alterações cardiovasculares. Objetivou-se avaliar o comportamento da atividade cardiovascular nas cirurgias para a remoção de terceiros molares utilizando a mepivacaína 2% com adrenalina na concentração de 1:100.000 em um período de até 120 min após a injeção anestésica. Trata-se de um estudo longitudinal, interventivo com caráter quantitativo e descritivo, com dados mensuráveis para análise e interpretação, realizado com pacientes da disciplina de clínica cirúrgica do curso de odontologia da UniCatólica. Os resultados obtidos foram analisados através do teste de normalidade de Kolmogorov-Smirnov e comparados ao longo do trans-operatório pelos testes ANOVA para medidas repetidas seguidas do pós-teste de Bonferroni ou Friedman seguido do pós-teste de Dunn adotando um nível de 5% de significância (p < 0,05). O procedimento com o anestésico utilizado não provocou alterações na Pressão Arterial Sistólica (PAS) (p=0,712), Pressão Arterial Diastólica (PAD) (p=0,098) bem como da diferença de PAS e PAD (p=0,546). Na Frequência Cardíaca (FC) houve diferença significante nos tempos de 10 min (p=0,013) e 120 min (p=0,013). Já na Saturação Periférica O2 (SPO2) houve diferença estatística significante nos tempos da 1ª visita (p=0,001), 0 (p=0,001), 5 (p=0,001) e 20 (p=0,001). Conclui-se assim, que o anestésico local pode ser utilizado em pacientes normotensivos durante a realização de procedimentos cirúrgicos odontológicos, e este leve aumento na FC e SPO2 pode estar relacionado à ansiedade e/ou ao estresse emocional dos pacientes(AU)

When injected into the tissues, Local Anesthetics and Vasoconstrictors (VC) initiate the process of absorption and elimination, passing through the bloodstream to reach toxic levels or induce cardiovascular changes. The aim of this study was to evaluate the behavior of cardiovascular activity in the surgeries for the removal of third molars using mepivacaine 2% with adrenaline at a concentration of 1: 100,000 in a period of up to 120 min after the anesthetic injection. It is a longitudinal, interventional study with a quantitative and descriptive character, with measurable data for analysis and interpretation, carried out with patients of the discipline of surgical clinic of the dentistry course of the UniCatólica. The results obtained were analyzed using the normality test of Kolmogorov-Smirnov and compared during the trans-operative period by ANOVA for repeated measurements followed by the Bonferroni or Friedman post-test followed by the Dunn post-test adopting a 5% level of significance (p <0.05). The procedure with the anesthetic used did not cause changes in systolic blood pressure (SBP) (p = 0.712), diastolic blood pressure (DBP) (p = 0.098) as well as SBP and DBP difference (p = 0.546). In heart rate (HR) there was a significant difference in the time of 10 min (p = 0.013) and 120 min (p = 0.013). In the O2 Peripheral Saturation (SPO2) there was a statistically significant difference at the time of the first visit (p = 0.001), 0 (p = 0.001), 5 (p = 0.001) and 20 (p = 0.001). It is concluded that the local anesthetic can be used in normotensive patients during dental surgical procedures, and this slight increase in HR and SPO2 may be related to the anxiety and / or emotional stress of the patients(AU)

Al ser administrados, los anestésicos locales y vasoconstrictores (VC) inician los procesos de absorción y eliminación, pasando por la circulación sanguínea pudiendo alcanzar niveles tóxicos o inducir alteraciones cardiovasculares. Se objetivó evaluar el comportamiento de la actividad cardiovascular en las cirugías para la remoción de terceros molares utilizando la mepivacaína 2% con adrenalina en la concentración de 1: 100.000 en un período de hasta 120 minutos después de la inyección anestésica. Se trata de un estudio longitudinal, interventivo con carácter cuantitativo y descriptivo, con datos mensurables para análisis e interpretación, realizado con pacientes de la disciplina de clínica quirúrgica del curso de odontología de la UniCatólica. Los resultados obtenidos fueron analizados a través del test de normalidad de Kolmogorov-Smirnov y comparados a lo largo del trans-operatorio por las pruebas ANOVA para medidas repetidas seguidas del post-test de Bonferroni o Friedman seguido del post-test de Dunn adoptando un nivel del 5% de significancia (p <0,05). El procedimiento con el anestésico utilizado no provocó cambios en la presión arterial sistólica (PAS) (p = 0,712), presión arterial diastólica (PAD) (p = 0,098), así como de la diferencia de PAS y PAD (p = 0,546). En la Frecuencia Cardiaca (FC) hubo diferencia significante en los tiempos de 10 min (p = 0,013) y 120 min (p = 0,013). En la Saturación Periférica O2 (SPO2) hubo diferencia estadística significante en los tiempos de la 1ª visita (p = 0,001), 0 (p = 0,001), 5 (p = 0,001) y 20 (p = 0,001). Se concluye así que el anestésico local puede ser utilizado en pacientes normotensivos durante la realización de procedimientos quirúrgicos odontológicos, y este leve aumento en la FC y SPO2 puede estar relacionado a la ansiedad y / o al estrés emocional de los pacientes(AU)

Avaliação comparativa de articaína 4% versus mepivacaína 2% para cirurgia de terceiros molares: ensaio clínico controlado, randomizado, duplo-cego, de boca dividida / Comparative evaluation of articaine 4% versus mepivacaine 2% for third molar surgery: randomized controlled trial, double-blind, mouth divided

A eficácia do controle da dor em exodontias de terceiros molares está associada ao tipo e concentração do anestésico local. No entanto a taxa de sucesso pode variar de acordo com o anestésico usado, influenciando no controle da dor, nos índices de complicações, entre elas a parestesia, e alterações sistêmicas do paciente. Este estudo clínico controlado em boca dividida, comparou o uso dos anestésicos locais cloridrato de articaína 4% e do cloridrato de mepivacaína 2%, ambos com epinefrina 1:100.000, para a anestesia local em exodontias de terceiros molares inferiores. Vinte pacientes, de ambos os gêneros, com idade média de 21 anos, com terceiros molares inferiores bilaterais em posições semelhantes de acordo com as classificações de Winter e Pell & Gregory, foram submetidos às cirurgias para exodontias, em consultas separadas, com cada um dos lados (direito e esquerdo) randomizados e alocados em dois grupos diferentes, denominados: Grupo 1ART (articaína 4%) e Grupo 2MEP (mepivacaína 2%). Os parâmetros de comparação foram: índice de dor, medida por meio de Escala Visual Analógica (EVA) no trans e pós-operatório imediato; também análise da eficácia anestésica, parâmetros hemodinâmicos, complicações durante e após a cirurgia, dentre os quais se enquadram a ocorrência de parestesia pós-operatória, e a satisfação do paciente e do operador. Não foram encontradas diferenças significativas nos índices de dor na comparação entre os dois anestésicos. O controle da dor foi mais efetivo até 2 horas do pós-operatório imediato e um menor volume de mepivacaína foi necessário para execução do procedimento (p=0,014). A ocorrência de parestesia foi observada com os dois tipos de anestésicos. O uso da articaína e da mepivacaína foi satisfatório para o paciente, e cirurgião, tendo este, o maior grau de satisfação para os momentos de divulsão e sutura (p<0,05), com a articaína(AU)

The efficacy of pain control in third molars is associated with the type and concentration of local anesthetic. However, success rates may vary according to the anesthetic used, influencing pain control, complication rates, including paresthesia and systemic changes of the patient. This split-mouth controlled clinical study compared the use of local anesthetics with 4% articaine hydrochloride and 2% mepivacaine hydrochloride, both with epinephrine 1: 100,000, for local anesthesia in lower molar extractions. Twenty patients of both genders, with an average age of 21 years, with three bilateral inferior inferiors in the limits according to the statistics of Winter and Pell & Gregory, underwent extraction surgeries, in collected consultations, with each one of them. The following sides (right and left) were randomized and allocated into two different groups, namely: Group 1ART (4% articaine) and Group 2MEP (2% mepivacaine). The comparison parameters were: pain index, measured by Visual Analogue Scale (VAS) in the trans and immediate postoperative period; also analysis of anesthesia efficacy, hemodynamic parameters, adverse events during and after surgery, which include the occurrence of postoperative paresthesia and patient and operator satisfaction. No significant differences were found in the comparison rates between two anesthetics. Pain control was more effective with in 2 hours of the immediate postoperative period and a smaller volume of mepivacaine was required to perform the procedure (p = 0.014). The occurrence of paresthesia was observed with both types of anesthetics. The use of articaine and mepivacaine was satisfactory for the patient and surgeon, who had a higher degree of satisfaction with the moments of division and suture (p <0.05) with one articaine(AU)

Is mepivacaine as effective as lidocaine during inferior alveolar nerve blocks in patients with symptomatic irreversible pulpitis? A systematic review and meta-analysis.

This study aimed to compare the effectiveness of mepivacaine and lidocaine for pulpal anaesthesia and pain control when administered via an inferior alveolar nerve block during the root canal treatment of mandibular molars in patients with symptomatic irreversible pulpitis. A research protocol was developed and registered in PROSPERO. The systematic search was conducted during May 2017 in eight databases. The studies were selected based on inclusion and exclusion criteria. Two examiners analysed the sample independently, decided the eligibility for inclusion and classified the articles according to their quality. Statistical analysis was performed with Mantel-Haenszel and I-square (I2 ) tests considering a confidence interval of 95%. The initial sample consisted of 1130 articles, out of which four were eligible. The articles were published between 1993 and 2016. For both pulpal anaesthesia and pain control, there was no significant difference between mepivacaine and lidocaine (P = 0.843, I2  = 0%, and P = 0.183, I2  = 21.1%, respectively). Mepivacaine and lidocaine were similarly effective for pulpal anaesthesia and pain control after inferior alveolar nerve blocks for root canal treatment.

Neurologic Outcomes After Low-Volume, Ultrasound-Guided Interscalene Block and Ambulatory Shoulder Surgery.

BACKGROUND AND OBJECTIVES: Postoperative neurologic symptoms after interscalene block and shoulder surgery have been reported to be relatively frequent. Reports of such symptoms after ultrasound-guided block have been variable. We evaluated 300 patients for neurologic symptoms after low-volume, ultrasound-guided interscalene block and arthroscopic shoulder surgery. METHODS: Patients underwent ultrasound-guided interscalene block with 16 to 20 mL of 0.5% bupivacaine or a mix of 0.2% bupivacaine/1.2% mepivacaine solution, followed by propofol/ketamine sedation for ambulatory arthroscopic shoulder surgery. Patients were called at 10 days for evaluation of neurologic symptoms, and those with persistent symptoms were called again at 30 days, at which point neurologic evaluation was initiated. Details of patient demographics and block characteristics were collected to assess any association with persistent neurologic symptoms. RESULTS: Six of 300 patients reported symptoms at 10 days (2%), with one of these patients having persistent symptoms at 30 days (0.3%). This was significantly lower than rates of neurologic symptoms reported in preultrasound investigations with focused neurologic follow-up and similar to other studies performed in the ultrasound era. There was a modest correlation between the number of needle redirections during the block procedure and the presence of postoperative neurologic symptoms. CONCLUSIONS: Ultrasound guidance of interscalene block with 16- to 20-mL volumes of local anesthetic solution results in a lower frequency of postoperative neurologic symptoms at 10 and 30 days as compared with investigations in the preultrasound period.

Plasma mepivacaine concentrations in patients undergoing third molar surgery.

BACKGROUND: Local anaesthetic-related systemic toxicity mainly results from elevated plasma concentrations of these drugs. We hypothesized that intraoral injection of submaximal doses of mepivacaine does not lead to toxic levels of this drug in blood. This study evaluated the plasma levels of mepivacaine in third molars surgeries. METHODS: Twenty-one patients were randomly assigned into two groups: group I (two unilateral third molars; submaximal dose of mepivacaine 108 mg with epinephrine 54 µg) and group II (four third molars; submaximal dose of mepivacaine 216 mg with epinephrine 108 µg). Blood samples were collected before anaesthesia, and 5, 10, 15, 20, 30, 40, 60, 90 and 120 min after anaesthesia. RESULTS: Individual peak plasma concentrations ranged 0.77-8.31 µg/mL (group I) and from 2.36-7.72 µg/mL (group II). An increase in the average dose of mepivacaine from 1.88 ± 0.12 mg/kg (group I) to 3.35 ± 0.17 mg/kg (group II) increased the mean mepivacaine peak plasma levels from 2.33 ± 0.58 to 4.01 ± 0.69 µg/mL, respectively. Four patients obtained plasma levels of mepivacaine above the threshold for toxicity (5 µg/mL). CONCLUSIONS: Toxic levels of mepivacaine are possible, even when a submaximal dose is used. A twofold increase in the dose of mepivacaine caused the mean peak plasma concentration to increase proportionally, indicating that they may be predicted based on the relation of dose per bodyweight.

The Anesthetic Effect of Anterior Middle Superior Alveolar Technique (AMSA).

Anesthesia of the soft and hard tissues of the maxilla may require up to 5 injections. Thus, the aim of this study was to evaluate the anesthetic efficacy of the anterior middle superior alveolar (AMSA) and supraperiosteal injection techniques during subgingival scaling and root planing (SRP). Thirty individuals with periodontitis were scheduled for SRP on the buccal aspect of teeth in the anterior maxilla. Before SRP, on a randomly chosen side of the maxilla, the supraperiosteal injection was performed in 1 session, while the AMSA injection was conducted in the contralateral side of the same patient in another session. Immediately after each SRP session, patients rated their pain perception during the procedure with a visual analog scale. No statistically significant differences in mean pain ratings during SRP were found after both anesthetic techniques (P > .05). This preliminary study demonstrated that the AMSA and supraperiosteal injection techniques provided similar anesthetic comfort during SRP. The AMSA injection could be an alternative to anesthetize the buccal aspect of maxilla, without the undesirable effects on facial structures such as the upper lip, nostrils, and lower eyelids. However, further randomized clinical trials with larger samples are necessary to confirm such results.

Temporal profile of the effects of regional anesthesia on the cutaneous reflexes of foot muscles.

We analyzed the effects of an anesthetic sciatic nerve block on the cutaneomuscular reflex (cMR) and the cutaneous silent period (cSP) of foot muscles, in order to investigate further the type of fibers involved in their generation. In 14 neurologically normal patients with indication for surgical treatment of hallux valgus, we recorded from the extensor digitorum brevis muscle the reflex responses elicited by high-intensity electrical stimulation of the big toe at various time periods, ranging from 0 to 20 min, after ultrasound-guided sciatic nerve popliteal anesthetic block. The first effect was a delay in cSP onset latency, with no changes in end latency. The cMR remained unaltered up to when subjects were no longer able to maintain the contraction. The effects of local anesthetics on peripheral nerves allow for recognition of the different types of fibers contributing to the cMR and the cSP in muscles of the lower limb.

Pharmacokinetic study of liposome-encapsulated and plain mepivacaine formulations injected intra-orally in volunteers.

OBJECTIVES: The pharmacokinetics of commercial and liposome-encapsulated mepivacaine (MVC) injected intra-orally in healthy volunteers was studied. METHODS: In this double blind, randomized cross-over study, 15 volunteers received, at four different sessions, 1.8 ml of the following formulations: 2% MVC with 1 : 100 000 epinephrine (MVC(2%EPI) ), 3% MVC (MVC(3%) ), 2% and 3% liposome-encapsulated MVC (MVC(2%LUV) and MVC(3%LUV) ). Blood samples were collected pre dose (0 min) and at 15, 30, 45, 60, 90, 120, 180, 240, 300, 360 min after injections. Liquid chromatography-tandem mass spectrometry was used to quantify plasma MVC concentrations. RESULTS: Pharmacokinetic analysis showed that the maximum plasma concentration (Cmax) and the areas under the curves (AUC(0-360) and AUC(0-∞)) after MVC(2%LUV) and MVC(2%EPI) injections were smaller (P < 0.05) than the equivalent figures for MVC(3%) and MVC(3%LUV). The time to maximum plasma concentration (Tmax) and the half-life of elimination (t½beta) obtained after the treatment with MVC(2%LUV), MVC(2%EPI), MVC(3%) and MVC(3%LUV) presented no statistically significant differences (P > 0.05). Cmax, AUC(0-360) and AUC(0-∞) after injection of the 2% formulations (MVC(2%LUV) and MVC(2%EPI) ) did not exhibit statistically significant differences (P > 0.05). The pharmacokinetics of MVC(2%LUV) were comparable to the pharmacokinetics of MVC(2%EPI). CONCLUSION: The liposomal formulation of 2% MVC exhibits similar systemic absorption to the local anesthetic with vasoconstrictor.

Predictive variables for postoperative pain after 520 consecutive dental extraction surgeries.

The aim of this study was to evaluate postoperative pain in patients who had a single tooth or multiple erupted teeth extracted. This research evaluated 520 consecutive dental extraction surgeries in which 680 teeth were removed. Data collection was obtained through a questionnaire of patients and of the undergraduate students who performed all procedures. Pain was evaluated through qualitative self-reported scores at seven days postsurgery. An increased pain level was statistically associated with ostectomy, postoperative complications, and tobacco consumption. Pain that persisted for more than two days was statistically associated with the amount of anesthetic solution used, with a notable increase in surgical time and development of postoperative complications. Periods of pain lasting more than two days could be expected for traumatic surgeries lasting more than 30 minutes. Both severe and prolonged pain were signs of development of postoperative complications, such as alveolar osteitis and alveolar infection.

Submucous tramadol increases the anesthetic efficacy of mepivacaine with epinephrine in inferior alveolar nerve block.

The purpose of this study was to evaluate the effect of submucous tramadol as adjuvant of mepivacaine with epinephrine in inferior alveolar nerve block. A double-blind, randomized, placebo-controlled, crossover clinical trial was conducted. Twenty healthy young volunteers were randomized into two treatment sequences using a series of random numbers. Sequence 1: Group A, 2% mepivacaine with 1:100,000 epinephrine plus submucous tramadol 50mg (1mL of saline) and one week later Group B, 2% mepivacaine with 1:100,000 epinephrine plus submucous placebo (1mL of saline). Sequence 2: Group B and one week later Group A. All treatments were administered 1min after that patient informed anesthesia of lower lip. We evaluated the duration of anesthesia of lower lip, anesthetic efficacy, and local and systemic adverse events. Anesthetic efficacy was better in group receiving submucous tramadol during the first 2h compared with group receiving submucous placebo (P<0.05). Submucous tramadol increased the anesthetic efficacy of mepivacaine with epinephrine of soft tissue in inferior alveolar nerve block.

Eficácia da articaína, da lidocaína e da mepivacaína associadas à epinefrina em pacientes com pulpite irreversível em molares mandibulares / Efficacy of articaine, of lidocaine and mepivacaine in patients associated with irreversible pulpitis in mandibular molars

O objetivo deste estudo foi comparar a eficácia anestésica da articaína 4%, da lidocaína 2% e da mepivacaína 2%, todas associadas à epinefrina 1:100.000, durante pulpectomia em pacientes com pulpite irreversível em molares mandibulares. Sessenta e seis voluntários do Setor de Urgência da Faculdade de Odontologia da Universidade de São Paulo receberam, aleatoriamente, 3,6ml de um dos anestésicos locais para o bloqueio convencional do nervo alveolar inferior (NAI). No caso de falha do bloqueio, foram administrados 3,6ml da mesma solução como injeção complementar no ligamento periodontal. O sinal subjetivo de anestesia do lábio, a presença de anestesia pulpar e ausência de dor durante a pulpectomia foram avaliados, respectivamente, por indagação ao paciente, por meio do aparelho estimulador pulpar elétrico (pulp tester) e por uma escala analógica verbal. A análise estatística foi realizada por meio dos testes Qui-quadrado, Kruskal Wallis e Razão de Verossimilhancas. Todos os pacientes reportaram anestesia no lábio após o bloqueio do NAI. A mepivacaína apresentou valores superiores (68,2%) para a anestesia pulpar após o bloqueio do NAI e a lidocaína (90%) após a injeção no ligamento periodontal. A mepivacaína apresentou valores superiores para a analgesia (72,7%) após o bloqueio no NAI e a lidocaína (90%) após a injeção no ligamento periodontal. Após a falha do bloqueio do NAI, a dor na câmara pulpar foi a mais frequente e após a falha da injeção no ligamento periodontal, a dor no canal. No entanto, essas diferenças não foram estatisticamente significantes. Portanto as três soluções anestésicas locais se comportam de forma semelhante e não apresentam efetivo controle da dor no tratamento da pulpite irreversível em molares mandibulares.

The aim of this study was to compare the anesthetic efficacy of 4% articaine, lidocaine 2% and 2% mepivacaine, all associated with epinephrine 1:100,000 during pulpectomy in patients with irreversible pulpitis in mandibular molars. Sixty-six volunteers Sector Emergency Faculty of Dentistry, Universidade de São Paulo randomly received 3.6 ml of a local anesthetic to block conventional inferior alveolar nerve. In case of failure of the lock, were administered 3.6 ml of the same solution as in the periodontal ligament injection complement. The signal subjective lip anesthesia, the presence of pulpal anesthesia and no pain during pulpectomy were evaluated respectively by questioning the patient, via the stimulating device electrical pulp (pulp tester) and a verbal analogue scale. Statistical analysis was performed using the chi-square test, Kruskal Wallis and likelihood ratio. All patients reported lip anesthesia after blockade of the inferior alveolar nerve. The mepivacaine showed higher values (68.2%) for pulpal anesthesia after blockade of the inferior alveolar nerve and lidocaine (90%) after injection in the periodontal ligament. The mepivacaine showed higher values for analgesia (72.7%) after blocking the inferior alveolar nerve and lidocaine (90%) after injection in the periodontal ligament. After the failure of the blockade of the inferior alveolar nerve, the pain in the pulp chamber was the most frequent and after the failure of the periodontal ligament injection, pain in the channel. However, these differences were not statistically significant. Therefore, the three local anesthetic solutions behave similarly and did not exhibit effective pain management in treating irreversible pulpitis in mandibular molars.

Efficacy of anesthetic agents to delay pain onset after periodontal surgery.

The aim of this study was to evaluate the influence of 2 anesthetic agents on patients' postoperative pain perception after periodontal surgery. For this parallel-group, double-blinded, randomized clinical trial, 36 open flap debridement surgeries were performed on patients who presented with periodontal disease with clinical signs of inflammation after nonsurgical treatment on at least 1 quadrant. Patients were allocated to 1 of the following groups: group 1, 2% lidocaine with 1 ∶ 100,000 epinephrine; group 2, 2% mepivacaine with 1 ∶ 100,000 norepinephrine. Pain intensity was assessed using the visual analog scale during the first 8 hours after surgery. All patients received 750-mg acetaminophen tablets, which they were instructed to take as a rescue medication if necessary. The results demonstrated that postoperative pain intensity was statistically lower in group 2 than in group 1 at the 1-, 2-, and 3-hour periods after surgery, although the pain intensity for all groups could be considered mild. In conclusion, patients in both groups reported similar mild pain after periodontal surgery.