Abstract Introduction The implant-prosthetic abutment interface and the formation of its microgaps are relevant aspects in load transfer and biological response and are linked to the success of the rehabilitation. Objective To evaluate microgaps at the internal connection interface of the Cone Morse implant and the prosthetic component surface by means of scanning electron microscopy (SEM). Material and method Twenty 3.75 x 11.0 mm Cone Morse dental implants with their respective Singular® prosthetic abutments were used (Singular Implants, RN, Brazil). The straight trunnions were attached to the implants with a 32N/cm2 torque and the ES260 Epoxy Resin-based set emerged to allow longitudinal sectioning of the sample. The samples were analyzed and the microgaps measured in SEM (JEOL JCM-5700, MA, USA), and later the data were analyzed. Result The mean and standard deviation of the largest microgaps were observed in the apical part of the right and left side 1.44±2.68 and 1.16±1.49 μm, respectively. The smallest microgaps were on the upper implant right and left sides 0.60±0.73 and 0.66±0.67 μm, respectively. However, in the Kruskal-Wallis test there was no statistically significant difference between the implant regions, both for the left side (p=0.692) and right side (p=0.865). The Mann-Whitney test, there were no statistically significant differences between the sides for the different regions of the implants. Conclusion Even with the presence of microgaps in the implant-post interface, it presents a smaller size than the one presenting biological and mechanical problems. The samples analyzed for their fitting compatibility were satisfactory.

Abstract Introduction The implant-prosthetic abutment interface and the formation of its microgaps are relevant aspects in load transfer and biological response and are linked to the success of the rehabilitation. Objective To evaluate microgaps at the internal connection interface of the Cone Morse implant and the prosthetic component surface by means of scanning electron microscopy (SEM). Material and method Twenty 3.75 x 11.0 mm Cone Morse dental implants with their respective Singular® prosthetic abutments were used (Singular Implants, RN, Brazil). The straight trunnions were attached to the implants with a 32N/cm2 torque and the ES260 Epoxy Resin-based set emerged to allow longitudinal sectioning of the sample. The samples were analyzed and the microgaps measured in SEM (JEOL JCM-5700, MA, USA), and later the data were analyzed. Result The mean and standard deviation of the largest microgaps were observed in the apical part of the right and left side 1.44±2.68 and 1.16±1.49 μm, respectively. The smallest microgaps were on the upper implant right and left sides 0.60±0.73 and 0.66±0.67 μm, respectively. However, in the Kruskal-Wallis test there was no statistically significant difference between the implant regions, both for the left side (p=0.692) and right side (p=0.865). The Mann-Whitney test, there were no statistically significant differences between the sides for the different regions of the implants. Conclusion Even with the presence of microgaps in the implant-post interface, it presents a smaller size than the one presenting biological and mechanical problems. The samples analyzed for their fitting compatibility were satisfactory.

Abstract Pain due to administration of local anesthetics is the primary reason for patients' fear and anxiety, and various methods are used to minimize it. This study aimed to measure the degree of pain during administration of anesthesia and determine the latency time and duration of pulpal anesthesia using two anesthetic methods in the maxilla. Materials and Methods: A randomized, single-blind, split-mouth clinical trial was conducted with 41 volunteers who required class I restorations in the maxillary first molars. Local anesthesia was administered with a needleless jet injection system (experimental group) or with a carpule syringe (control) using a 30-gauge short needle. The method of anesthesia and laterality of the maxilla were randomized. A pulp electric tester measured the latency time and duration of anesthesia in the second molar. Visual analogue scale (VAS) was used to measure the degree of pain during the anesthetic method. Data were tabulated and then analyzed by a statistician. The t-test was used to analyze the differences between the groups for basal electrical stimulation. Duration of anesthesia and degree of pain were compared using the Mann-Whitney test. A 5% significance level was considered. Results: There was no statistical difference in the basal electrical stimulation threshold (mA) and degree of pain between the two methods of anesthesia (p>0.05). Latency time was 2 minutes for all subjects. The duration of pulpal anesthesia showed no statistical difference (minutes) between the two methods (p<0.001), with a longer duration for the traditional method of anesthesia (median of 40 minutes). Conclusions: The two anesthetics methods did not differ concerning the pain experienced during anesthesia. Latency lasted 2 minutes for all subjects; the traditional infiltration anesthesia resulted in a longer anesthetic duration compared with the needleless jet injection.

Abstract Pain due to administration of local anesthetics is the primary reason for patients' fear and anxiety, and various methods are used to minimize it. This study aimed to measure the degree of pain during administration of anesthesia and determine the latency time and duration of pulpal anesthesia using two anesthetic methods in the maxilla. Materials and Methods: A randomized, single-blind, split-mouth clinical trial was conducted with 41 volunteers who required class I restorations in the maxillary first molars. Local anesthesia was administered with a needleless jet injection system (experimental group) or with a carpule syringe (control) using a 30-gauge short needle. The method of anesthesia and laterality of the maxilla were randomized. A pulp electric tester measured the latency time and duration of anesthesia in the second molar. Visual analogue scale (VAS) was used to measure the degree of pain during the anesthetic method. Data were tabulated and then analyzed by a statistician. The t-test was used to analyze the differences between the groups for basal electrical stimulation. Duration of anesthesia and degree of pain were compared using the Mann-Whitney test. A 5% significance level was considered. Results: There was no statistical difference in the basal electrical stimulation threshold (mA) and degree of pain between the two methods of anesthesia (p>0.05). Latency time was 2 minutes for all subjects. The duration of pulpal anesthesia showed no statistical difference (minutes) between the two methods (p<0.001), with a longer duration for the traditional method of anesthesia (median of 40 minutes). Conclusions: The two anesthetics methods did not differ concerning the pain experienced during anesthesia. Latency lasted 2 minutes for all subjects; the traditional infiltration anesthesia resulted in a longer anesthetic duration compared with the needleless jet injection.

Abstract Introduction The golden proportion, represented by the mathematical ratio 1:1.618, has been investigated in Orthodontics and orthognathic surgery in order to be established as a guide to clinical success related to facial aesthetics. Objective To verify the facial aesthetics of patients with Angle Class II and III deformities pre and post orthodontic-surgical treatment, and to analyze if 13 dental-skeletal patters (ratios) and 5 soft tissue ratios moved closer to or further away from the golden proportion after the orthognathic surgery. Material and method A total of 94 lateral cephalometric radiographs, in which 13 dental-skeletal ratios and 5 soft tissue ratios were measured and compared to the golden number. In addition, 270 examiners performed a subjective analysis of facial esthetics before and after treatment. Result Dental-skeletal ratios 1, 3, 6, 7, 8 and 9 moved closer to the golden number after orthognathic surgery in Class III patients. For the soft tissue profile, only ratio 4 moved closer to the golden number in both Class II and III patients. Regarding the subjective evaluation of facial aesthetics, 91.49% of the facial profiles were considered more harmonic after treatment. Conclusion Considering the methodology, it may be concluded that the golden proportion had little effect on the facial aesthetics evaluation and should not work as a guide for orthodontic-orthognathic planning and treatment.

Introduction: Epidemiological survey of maxillofacial lesions in a specific geographic region establishes the real needs of this population and guides health professionals in defining preventive actions and appropriate treatment.Objective: To analyze the histopathological diagnosis of maxillofacial lesions issued in the period 1996-2011 managed by the Laboratory of Oral Pathology, Department of Dentistry, Federal University of Sergipe, Brazil.Material and method: A retrospective study of biopsies removed from 1996-2011 was conducted, recovering data related to gender and age of the patients, location of the lesions and histopathological diagnosis. The lesions were grouped into eight diagnostic categories: benign neoplasms, potentially malignant lesions, malignant neoplasms, inflammatory lesions, odontogenic lesions, bone lesions, salivary gland lesions and malformations and developmental anomalies.Result: 762 reports were analyzed, with a higher prevalence of inflammatory lesions (n = 205, 26.9 %). The most common diagnosis among benign neoplasms was the peripheral giant cell granuloma (n=15), among potentially malignant lesions was the epithelial dysplasia (n=80), and in the malignant neoplasm group the most common lesion was the squamous cells carcinoma. (n=29). Analyzing the group of inflammatory lesions, we observed that the prevalent lesion was inflammatory fibrous hyperplasia (n=74). Periapical granuloma was the lesion that appeared most commonly among odontogenic lesions. The prevalent lesion among bone lesions was central ossifying fibroma (n=08), among salivary gland lesions was mucous retention (n=64), in the group of developmental anomalies the prevalent lesion was melanocytic macule (n=04).Conclusion: The findings of this survey highlight the importance in developing treatment plans and educational measures to prevent and reduce patients' exposure to risk factors.

Introduction: Epidemiological survey of maxillofacial lesions in a specific geographic region establishes the real needs of this population and guides health professionals in defining preventive actions and appropriate treatment.Objective: To analyze the histopathological diagnosis of maxillofacial lesions issued in the period 1996-2011 managed by the Laboratory of Oral Pathology, Department of Dentistry, Federal University of Sergipe, Brazil.Material and method: A retrospective study of biopsies removed from 1996-2011 was conducted, recovering data related to gender and age of the patients, location of the lesions and histopathological diagnosis. The lesions were grouped into eight diagnostic categories: benign neoplasms, potentially malignant lesions, malignant neoplasms, inflammatory lesions, odontogenic lesions, bone lesions, salivary gland lesions and malformations and developmental anomalies.Result: 762 reports were analyzed, with a higher prevalence of inflammatory lesions (n = 205, 26.9 %). The most common diagnosis among benign neoplasms was the peripheral giant cell granuloma (n=15), among potentially malignant lesions was the epithelial dysplasia (n=80), and in the malignant neoplasm group the most common lesion was the squamous cells carcinoma. (n=29). Analyzing the group of inflammatory lesions, we observed that the prevalent lesion was inflammatory fibrous hyperplasia (n=74). Periapical granuloma was the lesion that appeared most commonly among odontogenic lesions. The prevalent lesion among bone lesions was central ossifying fibroma (n=08), among salivary gland lesions was mucous retention (n=64), in the group of developmental anomalies the prevalent lesion was melanocytic macule (n=04).Conclusion: The findings of this survey highlight the importance in developing treatment plans and educational measures to prevent and reduce patients' exposure to risk factors.

INTRODUCTION : With the interest in anticipating access to the result of intraoral radiography, the radiographic processing is frequently neglected, compromising image quality. OBJECTIVE : The aim of this study was to evaluate the influence of interrupting the fixation process on the radiographic contrast and base-plus-fog density (BPFD) in three brands of periapical films. MATERIAL AND METHOD : Ninety radiographs were taken of an aluminum stepwedge and a lead plate for each brand, and they were divided according to the time of initial immersion in the fixative in: control group (without interrupting the fixing), 5, 10, 20, 30 and 40 seconds. During processing, films had the fixing stage stopped and were exposed to a negatoscope for 1 minute, then the fixation time of 10 minutes was completed. The radiographs were digitized and exported to Image Tool 3.0.software. RESULT : Kodak(r) film showed no statistically significant differences between groups, while Agfa(r) film presented difference in BPFD compared with Group 5 seconds, and Dentix(r) film showed statistical difference in all groups in comparison with the control group. CONCLUSION : Under the conditions studied, Kodak(r) film is not influenced by disruption of fixation as regards BPFD and image contrast, enabling early access to the results of radiographs, whereas Agfa(r) film requires at least 10 seconds of initial fixation, and Dentix(r) film obtains better results when the process of fixation is not interrupted.

AbstractIntroductionThe dual-cure resin cement is the main material for luting of ceramic. However, factors such as light source can influence the performance of the cement.ObjectiveEvaluate the influence of two light sources of different intensities on the microhardness of a resin cement when cured under different ceramics.Material and methodForty samples of dual resin cement were photoactivated by two LED light sources, with light intensity of 1000mW/cm² and 800mW/cm², respectively (40 seconds), under the base ceramic Zirconia, Spinel MgAl2O4 and Lithium Disilicate. In the control group, a glass plate was used. Each samples had the surface grounded (600 and 1200). After dry storage in the dark (24 hours), Vickers microhardness measurements were performed (HMV Shimadzu - 50gf/10 seconds). The data were submitted to factorial ANOVA and Tukey's test with significance level of 5%.ResultThe average hardness and standard deviation in the control group for cement polymerized 1000mW/cm² was 43.9±1.5 and 800mW/cm² the value of 43.4±1.3. The lowest value was for the Ceramic base of spinel MgAl2O4, light cured with 800mW/cm² with a value of 34.3±3.3.ConclusionThe ceramic type and intensity of the light source influence the hardness of the cement. The polymerization 1000mW/cm2 on the ceramic based on zirconia and spinel MgAl2O4 resulted in the best combination of hardness cement.

AbstractIntroductionThe dual-cure resin cement is the main material for luting of ceramic. However, factors such as light source can influence the performance of the cement.ObjectiveEvaluate the influence of two light sources of different intensities on the microhardness of a resin cement when cured under different ceramics.Material and methodForty samples of dual resin cement were photoactivated by two LED light sources, with light intensity of 1000mW/cm² and 800mW/cm², respectively (40 seconds), under the base ceramic Zirconia, Spinel MgAl2O4 and Lithium Disilicate. In the control group, a glass plate was used. Each samples had the surface grounded (600 and 1200). After dry storage in the dark (24 hours), Vickers microhardness measurements were performed (HMV Shimadzu - 50gf/10 seconds). The data were submitted to factorial ANOVA and Tukey's test with significance level of 5%.ResultThe average hardness and standard deviation in the control group for cement polymerized 1000mW/cm² was 43.9±1.5 and 800mW/cm² the value of 43.4±1.3. The lowest value was for the Ceramic base of spinel MgAl2O4, light cured with 800mW/cm² with a value of 34.3±3.3.ConclusionThe ceramic type and intensity of the light source influence the hardness of the cement. The polymerization 1000mW/cm2 on the ceramic based on zirconia and spinel MgAl2O4 resulted in the best combination of hardness cement.