Repositório RCAAP

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Universidade Federal de Uberlândia

One of the functions of teeth is to comminute food. Teeth and/or prosthodontics stability can influence subjects chewing pattern. This study evaluated comparatively the influence of oral rehabilitation type on masticatory performance in terms of number of cycles, masticatory ability, satisfaction and quality of life in adults with different removable restorations. The study involved 25 adults divided into two groups of mandibular rehabilitations: overdenture (PMSIR) and partial denture (RPD) Kennedy Class I, both as antagonist a conventional maxillary denture (PRT). The objective tests of masticatory performance were realized with the artificial test food Optocal. A shore A durometer was used before these tests to monitorate Optocal hardness up to 30 to 35 units. Food was provided in portions of 17 cubes (with sides of 5.6 mm) to test the masticatory performance. The grinding of the food was performed with 40 cycles.Optocal fragments were placed in a column of eight sieves in descending order of openings, ranging from 5.6 mm to 0.5 mm. The amount of artificial food retained in each sieve was measured and the Geometric Diameter Mean (GDM ) of particles obtained. Questionnaires were used to evaluate the ability, satisfaction, and quality of life of patients. The data of objective tests of masticatory performance were analyzed using the Student t test (p <0:05). For subjective tests was used the U-Mann-Whitney test (p <0:05). The values of reduction in percentage of (GDM ) for groups PMSIR and PPR was 27.08% and 18.36% respectively. The results showed masticatory performance similar to the groups, much lower than that natural dentition. Regarding the subjective parameters, the PPR group was more dissatisfied.

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

The criteria of success in endodontics and implant dentistry were evaluated in longitudinal studies through a systematic review. Bibliographic catalogue sources, electronically identified as MEDLINE (http://www.ncbi.nlm.nih.gov/PubMed), from 1966 until January 19th, and Cochrane Library on the same period, were used. On the searching strategy, the following combination of keywords were used: success criteria and dental implants OR failure criteria and dental implants OR success criteria and osseointegration OR failure criteria and osseointegration OR success criteria and endodontic treatment OR failure criteria and endodontic treatment OR success criteria and root canal treatment OR failure criteria and root canal treatment OR success criteria and endodontic therapy OR failure criteria and endodontic therapy OR success criteria and endodontics OR failure criteria and endodontics. The studies were selected by two independent reviewers that determined the inclusion and exclusion criteria. The search presented 684 related articles, with 263 articles that had no relation with the objective of this work, 206 articles were literature reviews, 378 articles were related with in vivo studies on humans and 14 studies on animals, and 112 were in vitro studies. From the 378 studies on humans, 15 satisfied the inclusion criteria, and all these were related to the success and/or survival of dental implants, with no work that fulfilled the inclusion criteria related to the success of non-surgical root canal treatment. In these studies, it was analyzed the success of 1601 implants with average success rate of 90.84%; the average survival of 5663 implants was 94.7%. It was observed that the investigations used distinct success criteria for the root canal treatments and the dental implants, what implicates the need of adoption of a consensus and actual model, to facilitate the future studies.

The aim of this study was to evaluate the microleakage of abutment/implant interface (A/I) in external hexagon implants (HE) with different torques values. Nine HE implants extern torque with conical abutments and screws were randomly selected and divided into three groups: V0.5, V1.0 and V1.5 and used in two experimental steps. A Escherichia coli bacterial suspension (BS) was prepared to the density of 0,5 McFarland standard and inoculated in the inner parts of the implants. The clarity of the broth was observed each 24 hours during 14 days, and after this period, the bacterial viability was checked by a microbiological test. In the first step, implants were inoculated as follows: V0.5- with 0.5 &#956;L of BS; V1.0- with 1.0 &#956;L of BS; and V1.5- with 1.5 &#956;L of BS. Then the abutments were wrench following the manufacturer s recommended torque values. In the second step, the experiment design was repeated three times for checking the reproducibility and the assemblies were divided into three groups with different torques values: T10- abutments wrench with 10 Ncm; T20- wrench with 20 Ncm and T32- wrench with 32 Ncm. The results showed that in the first step all the samples of V1.0 and V1.5 groups presented cloudy broth on the control tubes in the first 24 hours. In the second step, three samples presented positive results for bacterial leakage during the period of 14 days, which two were from the T10 group and one from the T20 group. After this period all the samples presented viability for the bacterial test. Within the limitations of this study, it was concluded that the torque value influenced the HE implants bacterial microleakage and that the standardization of the test methodology offered lower operator variables.

Biomaterials have been proposed as substitutes for autogenous grafts in gingival recessions treatment. The aim of this study was to evaluate the organic matrix of bovine bone marrow graft in root coating procedure. Three male dogs were used and they re in good general health. On vestibular root at mesial side of second lower pre-molars a bone defect with 3 mm in width and 5mm in height were created. Then, each animal received 2 grafts: conjunctive (autogenous) in the left side and organic matrix of bovine bone marrow (xenogenic) in the right side. After three months, the animals were anesthetized and were removed segments of the alveolar process containing the pre-molars, soft and bone tissue. These segments were fixed in formalin, demineralized and processed for embedding in paraffin. Semi-serial sections were obtained with 5 &#956;m thickness, in vestibular-lingual direction, which were stained with HE and examined under the microscope. In both experimental groups (conjunctive and bone matrix) was observed vestibular crest bone at a lower level and periodont showed normal characteristics, also, in some cases a proliferation of the junctional epithelium in apical direction was noted. The conjunctive presented numerous collagen fibers in various directions, inserted in cementum throughout extension, indicating the formation of a new insertion in the bone defect. The root surface showed areas of external resorption repaired by cellular cementum, including the insertion periodont. In addition, was observed signs of bone resorption of the external board, even with the presence of osteoclasts in activity. The results of this study suggest that the organic matrix of bovine bone marrow allows tissue repair and may be an alternative biomaterial in the treatment of gingival recessions.

The purpose of this study was to analyze the influence of the configuration and solid lubricant presence in the screw of pillar in the resistance to the flexão of compatible the Branemark® implantation. Forty pillars of the type universal trunnion had been connected the implantations with regular external hexagonal junction 4.1mm by means of 40 hexagonal screws, divided in four groups (n=10): FE (titanium screw tilted with thread in the extremity), LE (screw of titanium with solid lubricant and thread in the extremity), FT (titanium screw tilted with thread in all the length) and LT (screw of titanium with lubricant and thread in all its length). By means of the mechanical assay of flexão, the resistance of the system has implanted/pillar was evaluated, with load applied perpendicularly to the long axle of the implantation, in machine of mechanical assay (EMIC) under speed of 0,5mm/min. The data had been grouped and submitted the symmetry test. Test distribution free of Kruskal-wallis (P< was used; 0,05), and after that of Mann-whitney U to verify between which groups had difference. The results had statistical demonstrated to significant differences between the groups FE with excessively, being that FE presented the lowest values. Group LE presented statistical resulted better that LT. Ahead of the limitations of this work pose to conclude that it enters screws only tilted, of thread in all its extension provided to greater rigidity of the set, while between screws contends lubricative thread solid in all its length provided to minor rigidity of the joint implantation/pillar/screw that of threads only in the extremity.

The objective of this study was to evaluate the ability to identify occlusal prematurity, by cutting the paraxial CT cone beam, comparing the opinion of these images, provided by professionals in different specialities, with clinical examination obtained from strips of carbon paper. Sixteen young asymptomatic patients underwent an initial clinical examination and then were made appliance desprogramming individual (Lucia JIG). Through manipulation and marking interocclusal jaw with carbon film (Accufilm) identified clinically premature contact Centric Relation (CR) of each patient. Later these devices were set in the position of centric contact and used during the CT scans so that they could obtain tomographic images in the position of centric relation. After processing the images, these were analyzed for thirty professionals from different areas and compared the results obtained by the analysis of imaging and analysis of clinical markers. The data were statistically analyzed by analysis of variance ANOVA and Scott-Knott. From the evaluation of the ability to identify occlusal prematurity through cuts of paraxial CT cone beam, we can conclude that there was no statistically significant difference between the views of professionals with clinical examination carried out with carbon paper. Comparing the opinions expressed by professionals in the areas of occlusion, Radiology and General Clinicians, notes that there was no statistically significant differences. Regarding the time of his profession, the group with less time since graduation had the lowest rate of agreement among the analysis of imaging and clinical analysis with carbon paper.

Oral cancer, as represented by oral squamous cell carcinoma (OSCC) is responsible for high morbidity and mortality. This has been associated to the delay in seeking professionals together with establishing definitive diagnosis of lesions as the main factor responsible for the advanced stage of disease. The aim of this study was to evaluate the delay in diagnosis of oral cancer patients treated at the Uberlandia Federal University Hospital and analyze its relationship with socio-demographic data, illness-related behaviors and health care as well as clinical features of the disease. The different types of delay were assessed from the amplitude of time (variations) and medians. Statistical analysis was carried out using U Mann-Whitney and Kruskal-Wallis and univariate logistic regression analysis. A sample of 136 of squamous cell cases carcinoma located in different regions of the mouth was included in the study. Twenty-two variables related to patients were considered, being sociodemographic (age, sex, skin color, origin, marital status, employment status, educational level and income), behavior-related disease (exposure to tobacco or alcohol), health care (use of prosthesis, type of access to health services, patient patterns of referral) and clinical features of disease (location, size and signs and symptoms and clinical staging injuries). Three types of delay were examined: 1) delay of the patient, referring to the time elapsed between the perception of signs and symptoms and first appointment with health professionals, 2) delay of the professional, considered the time between the first appointment with health professional and definitive diagnosis of the disease (histopathological diagnosis) and 3) total delay as a result of the sum of two delays aforementioned. The results showed delays related to patient around 127 days (4.2 months), 19 days for professionals and 176 days (~ 6 months) for the total delay in cancer diagnosis. The delay of patients was responsible for longer time spent in the process of diagnosis, and 64% of patients had delays greater than 90 days. Two of the variables studied showed statistically different values: gender (p = 0.007) and presence of painful symptoms (p = 0.027). The delay for female patients (120 days) was lower than for males (225 days). For patients with pain, the delay was longer (150 days) than patients without pain (120 days). Only a marginal statistical association was observed for sex (p = 0.06, OR = 2.42), the delay was significantly associated with patients with lesions of intermediate size (p = 0.009, OR = 0.35). These patients had lower median delay. Regarding the delay of the professional, the median was 19 days, and approximately 50% of delays were greater than 15 days. No variable had categories with significantly different medians. Moreover, only the variable sex was statistically associated with professional delay (p = 0.033, OR = 2.60). Smaller lesions showed lower median and a lower risk of delay in diagnosing professional. The pattern of delayed diagnosis of median total values were significantly higher for males (p = 0.007) and patients with pain (p = 0.022) significantly different from its counterpart. However, only the variable size of the lesion were significantly associated to the total delay (p = 0.016, OR = 0.35). The pattern of delay observed is equal to those observed in studies in Brazil and abroad. Our findings also show that it does not seem common to identify associations between socio-demographic data related to behavior and care of illness and health with clinical disease and different types of delay. Also, the delay of the patient to the professional does not seem to be a risk factor for determining the staging of oral cancer.

Tumors of salivary gland constitute among less than 10% of malignant neoplasms affecting paranasal sinuses. There are few statistics about these tumors of the maxillary sinus (MS) in the Brazilian population. This is a retrospective study of the salivary gland tumors of the MS attended from 1997 to 2006 at the Brazilian National Institute of Cancer (INCA/MS/Brasil), the main governmental center for cancer statistics. Methods: After histological review for diagnostic confirmation, medical files were assessed to gather demographic and clinical data from 38 patients presenting salivary gland tumors in the maxillary sinus. Results: The adenoid cystic carcinoma (AdCC) was the most frequent histological type observed (63,1%), followed by mucoepidermoid carcinoma(MEC) (18,4%). Furthermore, one case (2,6%) of carcinoma expleomorfic adenoma (CA ex-PA), 4 (10,5%) cases of polymorphous low-grade adenocarcinoma (PLGA), 1 (2,6%) case of acinic cell carcinoma (ACC) and 1(2,6%) epithelial-myoepithelial carcinoma (EMC) were observed. The male to female ratio was 1:1,7. Most of the affected patients were white (68,4%). The patients average age was 50,8 years (from 18 to 79 years-old), with prevalence of patients in the 5th decade of life. 61,5% of the patients were non-smokers, and 71,7% were non drinkers. Tumor was registered as the main sign of the disease (23,6%), followed by pain (21,4%) and nasal obstruction (9,6%). Furthermore, 4 (10,5%) patients were diagnosed at stage II and as advanced disease, 10 (26,3%) were diagnosed at stage III and 24 (63,1%) at stage IV. Significant statistical results were not found when the following parameters were used for the survival analyses: histological subtype, stage of disease, grade of tumor, treatment modality, metastatic disease and recurrence. Conclusion: Salivary gland tumors of maxillary sinuses represent a group of tumor for which clinical manifestations are unspecific being, in general, diagnosed as advanced diseases. Adenoid cystic carcinoma is the most frequent tumor found in this location.

Fundação de Amparo a Pesquisa do Estado de Minas Gerais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Introduction: Short dental implants have been considered alternative to the reconstructive surgeries in patients with extremely atrophic maxillaries. Due to lack of prognostic data, the purpose of the present study was to evaluate the success percentage of short implants with and without immediate loading. Material and method: Short implants, Neodent® mark (cortical Titamax cm 3,75 mm of diameter and 7, 8, and 9 mm of length and cortical Titamax WS 4, 5 and 6mm of diameter and, 5 and 6 mm of length) were installed, in posterior region of partially edentulous mandibles (Kennedy Class I, II and III ). Based on primary stability, measured in the end of the installation, the implants had been placed in immediate or delayed loading. Those that had gotten torque lower than 32 Ncm had been left subgengival (2 stages ). In those with torque of 32 Ncm, but lower than 45 Ncm, abutments with 32 Ncm torque were installed, covered With protection caps (1 stage) and left without loading for at least 4 months. Those with torque of 45 Ncm or more were placed with immediate loading (1 stage). The temporay prosthesis had been installed splinted, with passive fit and adjusted in functional loading. The patients were followed up to at least 6 months from the implant installation. Result: Some 63 implants were installed in women of 34 to 79 years of age (average 55 years and two months); 33 implants (52.38%) had 45 Ncm torque and were placed immediate loading, 30 implants (47.62%) with less than 45 Ncm torque were placed in delayed in loading (4 months). Three of these implants had not stabilized in the surgical site (zero torque). In a follow up of 6 months, eight implants had failed, four with immediate loading and four without loading (failure of 12.12% and 13.33%, respectively). Six had been removed by presenting mobility and two had been expelled spontaneously, all within the maximum of 66 days after the surgery of installation. Conclusion: Short implants, installed in delayed or immediate loading, are therapeutic alternative for replacing missing teeth of posterior region of jaws with severe atrophy.

Fundação de Amparo a Pesquisa do Estado de Minas Gerais