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1.
Braz. dent. j ; 32(1): 9-15, Jan.-Feb. 2021. graf
Article in English | LILACS, BBO | ID: biblio-1180725

ABSTRACT

Abstract Aiming to evaluate cortical bone microarchitecture and osteonal morphology after irradiation, twelve male New Zealand rabbits were used. The animals were divided: control group (no radiation-NIr); and 3 irradiated groups, sacrificed after: 7 (Ir7d); 14 (Ir14d) and 21 (Ir21d) days. A single radiation dose of 30 Gy was used. Computed microtomography analyzed the cortical microarchitecture: cortical thickness (CtTh), bone volume (BV), total porosity (Ct.Po), intracortical porosity (CtPo-cl), channel/pore number (Po.N), fractal dimension (FD) and degree of anisotropy (Ct.DA). After scan, osteonal morphology was histologically assessed by means: area and perimeter of the osteons (O.Ar; O.p) and of the Haversian canals (C.Ar; C.p). Microtomographic analysis were performed by ANOVA, followed by Tukey and Dunnet tests. Osteon morphology analyses were performed by Kruskal-Wallis, and test Dunn's. Cortical thickness was significant difference (p<0.010) between the NIr and irradiated groups, with thicker cortex at Ir7d (1.15±0.09). The intracortical porosity revealed significant difference (p<0.001) between irradiated groups and NIr, with lower value for Ir7d (0.29±0.09). Bone volume was lower in Ir14d compared to control. Area and perimeter of the osteons were statistically different (p<0.0001) between NIr and Ir7d. Haversian canals also revealed lower values (p<0.0001) in Ir7d (80.57±9.3; 31.63±6.5) compared to NIr and irradiated groups. Cortical microarchitecture was affected by radiation, and the effects appear to be time-dependent, mostly regarding the osteons morphology at the initial days. Cortex structure in Ir21d revealed similarities to control suggesting that microarchitecture resembles normal condition after a period.


Resumo Com o objetivo de avaliar a microarquitetura óssea cortical e a morfologia dos osteons após irradiação, foram utilizados doze coelhos machos da Nova Zelândia. Os animais foram divididos: grupo controle (sem radiação-NIr); e 3 grupos irradiados, sacrificados após: 7 (Ir7d); 14 (Ir14d) e 21 (Ir21d) dias. Foi utilizada uma dose única de radiação de 30 Gy. A microtomografia computadorizada analisou a microarquitetura cortical: espessura cortical (CtTh), volume ósseo (BV), porosidade total (Ct.Po), porosidade intracortical (CtPo-cl), número de canal/ poro (Po.N), dimensão fractal (DF) e grau de anisotropia (Ct.DA). Após a varredura, a morfologia dos osteosn foi avaliada histologicamente por meio de: Área e perímetro do osteon (O.Ar; O.p) e dos canais de Havers (C.Ar; C.p). A análise microtomográfica foi realizada por ANOVA, seguida pelos testes de Tukey e Dunnet. As análises morfológicas do osteon foram realizadas por Kruskal-Wallis e testadas por Dunn. A espessura cortical foi diferente (p<0,010) entre os grupos controle e irradiados, com córtex mais espesso no Ir7d (1,15±0,09). A porosidade intracortical revelou diferenças significativas (p<0,001) entre os grupos irradiados e o controle, com menor valor para Ir7d (0,29±0,09). O volume ósseo foi menor no Ir14d em relação ao controle. Área e perímetro do osteon foi diferente (p<0,0001) entre o controle e Ir7d. Os canais haversianos também revelaram valores mais baixos (p<0,0001) em Ir7d (80.57±9.3; 31.63±6.5) em relação ao controle e demais grupos irradiados. A microarquitetura cortical é afetada pela radiação e os efeitos parecem ser dependentes do tempo, principalmente em relação à morfologia dos osteons nos dias iniciais. A estrutura cortical em Ir21d revelou semelhanças com o controle, sugerindo que a microarquitetura se assemelha à condição normal após um período.


Subject(s)
Animals , Male , Rabbits , Cortical Bone/diagnostic imaging , Haversian System , Bone and Bones , Porosity , Fractals
2.
Braz. oral res. (Online) ; 34: e007, 2020. graf
Article in English | LILACS | ID: biblio-1089397

ABSTRACT

Abstract The aim of this study was to assess the influence of cyclosporine administration on the repair of critical-sized calvaria defects (CSDs) in rat calvaria filled with diverse biomaterials. Sixty animals were divided into two groups: the control (CTR) group (saline solution) and the cyclosporine (CCP) group (cyclosporine, 10 mg/kg/day). These medications were administered daily by gavage, beginning 15 days before the surgical procedure and lasting until the day the animals were euthanized. A CSD (5 mm Ø) was made in the calvaria of each animal, which was allocated to one of 3 subgroups, according to the biomaterial used to fill the defect: coagulum (COA), deproteinized bovine bone (DBB), or biphasic calcium phosphate ceramics of hydroxyapatite and β-phosphate tricalcium (HA/TCP). Euthanasia of the animals was performed 15 and 60 days after the surgical procedure (n = 5 animals/period/subgroup). Bone repair (formation) assessment was performed through microtomography and histometry, while the analyses of the expression of the BMP2, Osteocalcin, and TGFβ1 proteins were performed using immunohistochemistry. The CSDs not filled with biomaterials demonstrated lower bone formation in the CCP group. At 15 days, less bone formation was observed in the CSDs filled with DBB, a smaller volume of mineralized tissue was observed in the CSDs filled with HA/TCP, and the expression levels of BMP2 and osteocalcin were lower in the CCP group compared to the CTR group. The use of cyclosporine impaired bone repair in CSD, and this effect can be partially explained by the suppression of BMP2 and osteocalcin expression.


Subject(s)
Animals , Male , Rats , Osteogenesis/drug effects , Bone Regeneration/drug effects , Cyclosporine/pharmacology , Bone Substitutes/pharmacology , Calcineurin Inhibitors/pharmacology , Skull/drug effects , Skull/pathology , Time Factors , Immunohistochemistry , Random Allocation , Osteocalcin/analysis , Reproducibility of Results , Transforming Growth Factor beta1/analysis , Bone Morphogenetic Protein 2/analysis , X-Ray Microtomography
3.
Braz. oral res. (Online) ; 34: e080, 2020. tab, graf
Article in English | LILACS, BBO | ID: biblio-1132682

ABSTRACT

Abstract The aims of the present study were to compare conventional radiography, radiographs digitized with a scanner or photographic camera, and digital radiography, used to evaluate the radiopacity of endodontic materials, and to compare the accuracy of linear and quadratic models used to convert radiopacity values to equivalent millimeters of aluminum (mm Al). Specimens of AH Plus, Endofill, Biodentine and BioMTA materials (n = 8) were radiographed next to an aluminum step-wedge using radiographic films and digital radiography systems (FONA CMOS sensor, Kodak CMOS sensor and photosensitive phosphor plate-PSP). Conventional radiographs were digitized using a scanner or photographic digital camera. Digital images of all the radiographic systems were evaluated using dedicated software. Optical density units (ODU) of the specimens and the aluminum step-wedge were evaluated by a photo-densitometer (PTDM), used in conventional radiographs. The radiopacity in equivalent mm Al of the materials was determined by linear and quadratic models, and the coefficients of determination (R2) values were calculated for each model. Radiopacity of the materials ranged from -9% to 25% for digital systems and digitized radiographs, compared to the PTDM (p < 0.05). The R2 values of the quadratic model were higher than those of the linear model. In conclusion, the FONA CMOS sensor showed the lowest radiopacity variability of the methodologies used, compared with the PTDM, except for the BioMTA group (higher than PTDM). The quadratic model showed higher R2 values than the linear model, thus indicating better accuracy and possible adoption to evaluate the radiopacity of endodontic materials.


Subject(s)
Aluminum , X-Ray Film , Materials Testing , Radiography, Dental, Digital
4.
Braz. oral res. (Online) ; 34: e007, 2020. graf
Article in English | LILACS | ID: biblio-1055531

ABSTRACT

Abstract The aim of this study was to assess the influence of cyclosporine administration on the repair of critical-sized calvaria defects (CSDs) in rat calvaria filled with diverse biomaterials. Sixty animals were divided into two groups: the control (CTR) group (saline solution) and the cyclosporine (CCP) group (cyclosporine, 10 mg/kg/day). These medications were administered daily by gavage, beginning 15 days before the surgical procedure and lasting until the day the animals were euthanized. A CSD (5 mm Ø) was made in the calvaria of each animal, which was allocated to one of 3 subgroups, according to the biomaterial used to fill the defect: coagulum (COA), deproteinized bovine bone (DBB), or biphasic calcium phosphate ceramics of hydroxyapatite and β-phosphate tricalcium (HA/TCP). Euthanasia of the animals was performed 15 and 60 days after the surgical procedure (n = 5 animals/period/subgroup). Bone repair (formation) assessment was performed through microtomography and histometry, while the analyses of the expression of the BMP2, Osteocalcin, and TGFβ1 proteins were performed using immunohistochemistry. The CSDs not filled with biomaterials demonstrated lower bone formation in the CCP group. At 15 days, less bone formation was observed in the CSDs filled with DBB, a smaller volume of mineralized tissue was observed in the CSDs filled with HA/TCP, and the expression levels of BMP2 and osteocalcin were lower in the CCP group compared to the CTR group. The use of cyclosporine impaired bone repair in CSD, and this effect can be partially explained by the suppression of BMP2 and osteocalcin expression.


Subject(s)
Animals , Male , Rats , Osteogenesis/drug effects , Bone Regeneration/drug effects , Cyclosporine/pharmacology , Bone Substitutes/pharmacology , Calcineurin Inhibitors/pharmacology , Skull/drug effects , Skull/pathology , Time Factors , Immunohistochemistry , Random Allocation , Osteocalcin/analysis , Reproducibility of Results , Transforming Growth Factor beta1/analysis , Bone Morphogenetic Protein 2/analysis , X-Ray Microtomography
5.
J. appl. oral sci ; 27: e20180429, 2019. tab, graf
Article in English | LILACS, BBO | ID: biblio-990101

ABSTRACT

Abstract Objectives: To evaluate the radiopacity of Biodentine (BD) and BD associated with 15% calcium tungstate (BDCaWO4) or zirconium oxide (BDZrO2), by using conventional and digital radiography systems, and their physicochemical and biological properties. Materials and Methods: Radiopacity was evaluated by taking radiographs of cement specimens (n=8) using occlusal film, photostimulable phosphor plates or digital sensors. Solubility, setting time, pH, cytocompatibility and osteogenic potential were also evaluated. Data were analyzed using one-way ANOVA and Tukey post-test or two-way ANOVA and Bonferroni post-test (α=0.05). Results: BD radiopacity was lower than 3 mm Al, while BD ZrO2 and BD CaWO4 radiopacity was higher than 3 mm Al in all radiography systems. The cements showed low solubility, except for BDCaWO4. All cements showed alkaline pH and setting time lower than 34 minutes. MTT and NR assays revealed that cements had greater or similar cytocompatibility in comparison with control. The ALP activity in all groups was similar or greater than the control. All cements induced greater production of mineralized nodules than control. Conclusions: Addition of 15% ZrO2 or CaWO4 was sufficient to increase the radiopacity of BD to values higher than 3 mm Al. BD associated with radiopacifiers showed suitable properties of setting time, pH and solubility, except for BDCaWO4, which showed the highest solubility. All cements had cytocompatibility and potential to induce mineralization in Saos-2 cells. The results showed that adding 15% ZrO2 increases the radiopacity of BD, allowing its radiography detection without altering its physicochemical and biological properties.


Subject(s)
Humans , Zirconium/chemistry , Tungsten Compounds/chemistry , Silicates/chemistry , Calcium Compounds/chemistry , Radiography, Dental, Digital/methods , Osteoblasts/drug effects , Reference Values , Solubility , Time Factors , Zirconium/pharmacology , Materials Testing , Cell Survival/drug effects , Reproducibility of Results , Analysis of Variance , Anthraquinones , Tungsten Compounds/pharmacology , Silicates/pharmacology , Calcium Compounds/pharmacology , Alkaline Phosphatase/analysis , Hydrogen-Ion Concentration
6.
Braz. dent. j ; 29(3): 227-238, May-June 2018. graf
Article in English | LILACS | ID: biblio-951543

ABSTRACT

Abstract Micro computed tomography (µCT) follows the same principle of computed-tomography used for patients, however providing higher-resolution. Using a non-destructive approach, samples can be scanned, and each section obtained is used to build a volume using tridimensional reconstruction. For bone analysis, it is possible to obtain information about the tissue's microarchitecture and composition. According to the characteristics of the bone sample (e.g. human or animal origin, long or irregular shape, epiphysis or diaphysis region) the pre-scanning parameters must be defined. The resolution (i.e. voxel size) should be chosen taking into account the features that will be evaluated, and the necessity to identify inner structures (e.g. bone channels and osteocyte lacunae). The region of interest should be delimited, and the threshold that defines the bone tissue set in order to proceed with binarization to separate the voxels representing bone from the other structures (channels, resorption areas, and medullary space). Cancellous bone is evaluated by means of the trabeculae characteristics and their connectivity. The cortex is evaluated in relation to the thickness and porosity. Bone mineral density can also be measured, by the amount of hydroxyapatite. Other parameters such as structure-model-index, anisotropy, and fractal dimension can be assessed. In conclusion, intrinsic and extrinsic determinants of bone quality can be assessed by µCT. In dentistry, this method can be used for evaluating bone loss, alterations in bone metabolism, or the effects of using drugs that impair bone remodeling, and also to assess the success rate of bone repair or surgical procedures.


Resumo A microtomografia computadorizada segue o mesmo princípio da tomografia computadorizada utilizada para avaliação dos pacientes, mas neste caso, é empregada para pequenas amostras com alta resolução. De forma não destrutiva, as amostras podem ser escaneadas, e cada fatia obtida é organizada de forma seriada para formar um volume tridimensional (3D). Para análise óssea, é possível obter informações de microarquitetura e composição mineral, permitindo avaliação distinta entre diferentes sítios. De acordo com as características de cada amostra óssea, como amostras de humanos, animais, ossos longos ou achatados, epífise ou diáfise, etc, devem ser definidos os parâmetros pré-escaneamento com a resolução desejada, levando em consideração quais informações serão extraídas da avaliação. Depois do escaneamento e da reconstrução, deve-se proceder com a seleção da região de interesse (ROI), e depois seguir com o processo de binarização, que se caracteriza pela escolha de um limiar que define os voxels que compõem a região de osso e àqueles que compõem a região dos buracos (canais, áreas de reabsorção e espaço medular). No osso trabecular e no reparo os parâmetros avaliados se baseiam nas características das trabéculas e sua conectividade. No osso cortical os parâmetros estão relacionados com a espessura e porosidade. Além dos parâmetros de microarquitetura, também é possível avaliar a densidade mineral óssea, calculada por volume de hidroxiapatita. Outros parâmetros também podem ser mensurados, utilizando técnicas computacionais como a análise de textura. Parâmetros intrínsecos e extrínsecos da qualidade óssea podem ser avaliados pela microtomografia computadorizada. Na odontologia, este método pode ser empregado em estudos que objetivem avaliar doenças, alterações metabólicas e medicamentos com repercussão no metabolismo ósseo, e na avaliação do processo de reparo e de técnicas cirúrgicas.


Subject(s)
Humans , Animals , Bone and Bones/diagnostic imaging , Radiography, Dental/methods , Imaging, Three-Dimensional/methods , X-Ray Microtomography/methods , Bone and Bones/anatomy & histology , Image Processing, Computer-Assisted , Bone Density , Porosity
7.
RGO (Porto Alegre) ; 65(4): 308-314, Oct.-Dec. 2017. tab, graf
Article in English | LILACS, BBO | ID: biblio-896045

ABSTRACT

ABSTRACT Objective: This study evaluated two implant-abutment connection systems under immediate loading of lower prosthesis in edentulous mandibles. Methods: Seventy-two implants placed in 18 patients were analyzed. The parameters evaluated included probing depth, stability of implants and perimplant bone loss, which were measured immediately when installing the prosthesis and after 3 and 6 months. All data underwent statistical analysis (T-Test and ANOVA, 5% significance level). Results: Implants with Morse cone connections showed smaller, statistically significant probing depth values for all periods (0.68/1.19/1.31), when compared to the external hexagon connections (1.08/1.52/1.64). A statistically significant difference was observed between baseline, 3 months (p<0.01 for Morse cone; p<0.001 for external hexagon) and 6 months (p<0.001 for both connections). When periods were considered there was a statistically significant difference in Implant Stability Quotient ISQ values between baseline and 6 months for both prosthetic connections. Conclusion: Immediate loading of the lower prosthesis is a viable option for the treatment of edentulous mandibles and that the external hexagon or Morse cone connections do not interfere with the success of the implants in a short-term evaluation.


RESUMO Objetivo: Avaliar dois sistemas de conexões protéticas sobre carga imediata em próteses tipo protocolo em mandíbulas edêntulas. Métodos: Setenta e dois implantes instalados em 18 pacientes foram analisados. Os parâmetros avaliados incluíram: profundidade de sondagem, estabilidade dos implantes e perda óssea periimplantar, os quais foram mensurados imediatamente após a instalação das próteses e depois de 3 e 6 meses pós-operatórios. Todos os dados foram submetidos à análise estatística (Teste T e ANOVA, ao nível de 5% de significância). Resultados: Implantes com conexão cone Morse mostraram profundidade de sondagem estatisticamente menor em todos os períodos (0,68/1,19/1,31), quando comparado com a conexão hexágono externo (1,08/1,52/1,64). Diferença estatisticamente significante foi observada entre o pré-operatório imediato, 3 meses (p<0,01 para cone Morse; p<0,001 para hexágono externo) e 6 meses (p<0,001 para ambas as conexões). Quando os períodos foram considerados houve uma diferença estatisticamente significante no quociente de estabilidade do implante (ISQ) entre o pré-operatório imediata e de 6 meses para ambas as conexões protéticas. Conclusão: A carga imediata sobre protocolos inferiores é uma opção viável para o tratamento de mandíbulas edêntulas e a conexão hexágono externo ou cone Morse não interferiram no sucesso dos implantes em um período curto de avaliação.

8.
Braz. oral res. (Online) ; 31: e28, 2017. tab, graf
Article in English | LILACS | ID: biblio-839509

ABSTRACT

Abstract The purpose of this study is to evaluate the effect of the avocado/soybean unsaponifiables (ASU) on the treatment of induced periodontitis in rats. Periodontitis was induced in 84 rats via ligature placement around the second upper molar, which was removed after 7 days, and scaling and root planning (SRP) was performed at this time. Subsequently, the rats were randomly allocated to four groups with 21 animals each: One SRP group in which saline solution was administered (SS), and three groups in which ASU was administered (0.6 g/kg/day), beginning either 7 days before the induction of periodontitis (SRP/ASU-7), on the day of periodontitis induction (SRP/ASU0), or on the day of treatment (SRP/ASU+7). ASU and SS were administered daily by gavage until the sacrifice of the animals (7, 15, and 30 days after SRP). The % bone in the furcation area was evaluated by histomorphometry and micro-CT. The expression of proteins (TRAP, RANKL, and alkaline phosphatase) and mRNA (IL-1β, TNF-α, IL-6, RANKL, and alkaline phosphatase) were evaluated by immunohistochemistry and qPCR. The SRP/ASU+7 group presented a higher percentage of bone fill in the furcation area and higher expression of alkaline phosphatase than in the SRP group (at 7 and 30 days, respectively). The SRP/ASU0 and SRP/ASU+7 groups presented lower expression levels of RANKL mRNA than the SRP and SRP/ASU-7 groups at 15 days. ASU administration on the day of the SRP treatment of the ligature-induced periodontitis promoted subtle beneficial effects on periodontal repair following the treatment of induced periodontitis within the experimental period of 7 days.


Subject(s)
Animals , Male , Periodontitis/drug therapy , Soybeans/chemistry , Plant Extracts/therapeutic use , Persea/chemistry , Periodontitis/etiology , Periodontitis/pathology , Reference Values , Time Factors , Immunohistochemistry , Random Allocation , Gene Expression , Reproducibility of Results , Interleukin-6/analysis , Tumor Necrosis Factor-alpha/analysis , Treatment Outcome , Root Planing/methods , Rats, Sprague-Dawley , Interleukin-1beta/analysis , RANK Ligand/analysis , Real-Time Polymerase Chain Reaction , Tartrate-Resistant Acid Phosphatase/analysis
9.
Rev. odontol. UNESP (Online) ; 45(6): 356-361, nov.-dez. 2016. tab, ilus
Article in English | LILACS, BBO | ID: biblio-830702

ABSTRACT

Introduction: Anteroposterior maxillary deficiency can be associated with a decrease of upper airway volume. Maxillary advancement can improve the upper airway space. Aim: To correlate cephalometric (2D) and volumetric (3D) measurements of the upper airway in class III patients treated by maxillary advancement. Material and method: This retrospective transversal study was performed in ten adult patients submitted to maxillary advancement for correction of class III deformity secondary to maxillary anteroposterior deficiency. The Cone beam tomography files included in the medical records were used: (T1) pre-operative and (T2) 6 to 8 months postoperative. The DICOM files were imported and reconstructed for volumetric and cephalometric evaluation of the upper airway, as divided into nasopharynx, oropharynx and hypopharynx (Arnett & Gunson FAB Surgery). Result: Age ranged from 26 to 55 years with a mean of 36.3±9.2 years. There were no statistically significant differences for cephalometric and volumetric parameters of the three pharyngeal regions between T1 and T2 periods. This was due to the small amount of maxillary advancement necessary to correct the maxillary deformity in the studied patients (4.7±1.89mm). The correlation between area and volume was not statistically significant only for preoperative measurements of the nasopharynx (r=0.30, p=0.40). It was significant for the other regions and evaluation periods (p<0.05). Conclusion: Small maxillary advancements do not result in significant increases in airway dimensions.


Introdução: A deficiência anteroposterior da maxila pode estar associada com a diminuição do volume da via aérea superior. O avanço de maxila por resultar em um aumento do espaço aéreo superior. Objetivo: Correlacionar mensurações cefalométricas (2D) e volumétricas (3D) da via aérea superior em pacientes classe III tratados por meio de avanço maxilar. Material e método: Este estudo retrospectivo transversal foi realizado em dez pacientes adultos submetidos ao avanço de maxila para correção de deficiência anteroposterior de maxila e deformidade classe III. Foram incluídos os dados de tomografias computadorizadas Cone beam em dois períodos: pré-operatório (T1) e pós-operatório de 6 a 8 meses (T2). Os arquivos DICOM foram importados e reconstruídos para avaliação volumétrica e cefalométrica da via aérea superior, dividida em nasofaringe, orofaringe e hipofaringe (Arnett & Gunson FAB Surgery). Resultado: A idade variou de 26 a 55 anos, com média de 36,3±9,2 anos. Não foram verificadas diferenças estatisticamente significantes para os parâmetros cefalométricos e volumétricos das três regiões da faringe entre os períodos T1 e T2. Este resultado ocorreu devido à pequena quantidade de avanço maxilar (4,7±1,89mm) necessário para a correção da deformidade na amostra. A correlação entre área e volume não foi estatisticamente significante apenas para as mensurações pré-operatórias da nasofaringe (r=0,30; p=0,40). Nas outras regiões e períodos a correlação foi estatisticamente significante (p<0,05). Conclusão: Avanços maxilares de pequenas dimensões não resultam em um aumento significativo das dimensões da via aérea superior.


Subject(s)
Cephalometry , Mandibular Advancement , Cone-Beam Computed Tomography , Airway Remodeling , Orthognathic Surgery , Malocclusion, Angle Class III , Maxilla
10.
J. appl. oral sci ; 24(2): 121-125, Mar.-Apr. 2016. tab
Article in English | LILACS | ID: lil-779910

ABSTRACT

ABSTRACT Objective To evaluate solubility and sealing ability of Mineral Trioxide Aggregate (MTA) and root-end filling materials. Material and Methods The materials evaluated were: MTA, Calcium Silicate Cement with zirconium oxide (CSC/ZrO2), and zinc oxide/eugenol (ZOE). Solubility test was performed according to ANSI/ADA. The difference between initial and final mass of the materials was analyzed after immersion in distilled water for 7 and 30 days. Retrograde cavities in human teeth with single straight root canal were performed by using ultrasonic tip CVD 9.5107-8. The cavities were filled with the evaluated materials to evaluate sealing ability using the bacterial leakage test with Enterococcus faecalis. Bacterial leakage was evaluated every 24 hours for six weeks observing the turbidity of Brain Heart infusion (BHI) medium in contact with root apex. Data were submitted to ANOVA followed by Tukey tests (solubility), and Kruskal-Wallis and Dunn tests (sealing ability) at a 5% significance level. Results For the 7-day period, ZOE presented highest solubility when compared with the other groups (p<0.05). For the 30-day period, no difference was observed among the materials. Lower bacterial leakage was observed for MTA and CSC/ZrO2, and both presented better results than ZOE (p<0.05). Conclusion MTA and CSC/ZrO2 presented better bacterial sealing capacity, which may be related to lower initial solubility observed for these materials in relation to ZOE.


Subject(s)
Humans , Aluminum Compounds/chemistry , Calcium Compounds/chemistry , Dental Leakage/microbiology , Eugenol/chemistry , Oxides/chemistry , Root Canal Filling Materials/chemistry , Silicates/chemistry , Zinc Oxide/chemistry , Zirconium/chemistry , Analysis of Variance , Dental Cavity Lining , Dental Pulp Cavity/drug effects , Dental Pulp Cavity/microbiology , Drug Combinations , Enterococcus faecalis , Materials Testing , Reproducibility of Results , Retrograde Obturation/methods , Solubility , Statistics, Nonparametric , Time Factors
11.
Int. j. odontostomatol. (Print) ; 9(3): 483-487, dic. 2015. ilus
Article in English | LILACS | ID: lil-775475

ABSTRACT

The aim was to evaluate the differences of implant stability quotient (ISQ) between implants with external hexagon and Morse taper connectors. The study had a split mouth design, composed by 10 patients who received hybrid protocol prosthesis. In total, 40 implants (3.75 x 13 mm) were installed: on the right side, 20 external hexagon, and on the left, 20 Morse taper. After two years in function, the stability test was applied by using the MRI machine Osstell ISQ directly on the implants and on the abutments. Considering the measurements made on the implants, there were differences between HE and CM mesial (p= 0.011), lingual (p= 0.003) and distal (p= 0.006). Considering the measurements made on the abutments, there were differences between HE and CM on the buccal (p= 0.020) and lingual (p= 0.004). The trend and higher values are for the CM group. The values for Morse taper implants were always higher in a statistically significant manner, when compared to the external hexagon.


El objetivo fue evaluar las diferencias del coeficiente de estabilidad de implantes comparando los de conexión de hexágono externo (HE) y cono morse (CM). El estudio tuvo un diseño de boca dividida, siendo compuesta por 10 pacientes que recibieron protocolos protésicos de tipo hibrido. En total, 40 implantes (3,75x13 mm) fueron instalados: en el lado derecho, 20 implantes de hexágono externo y en el lado izquierdo, 20 implantes de cono morse. Después de dos años en función, la prueba de estabilidad fue aplicada utilizando una maquina MRI, Ostell ISQ directamente sobre los implantes y pilares. Considerando las medidas en los implantes, hubo diferencias entre los implantes HE y CM en mesial (p= 0,011), lingual (p= 0,003) y distal (p= 0,006). Considerando las medidas en los pilares, hubo diferenciasentre HE y CM en el sector bucal (p= 0,020) y lingual (p= 0,004). Los valores mas altos se obtuvieron en CM; los valores de las conexión tipo cono morse presentaron mayor estabilidad al comparase con los implantes de conexión de hexágono externo.


Subject(s)
Humans , Dental Implants , Dental Abutments , Dental Implantation, Endosseous , Epidemiology, Experimental , Dental Prosthesis Design , Resonance Frequency Analysis
12.
Rev. odontol. UNESP (Online) ; 44(5): 273-279, set.-out. 2015. tab, graf
Article in English | LILACS-Express | LILACS | ID: lil-763350

ABSTRACT

AbstractObjectiveThe aim of this study was to assess the stresses and strains generated after the application of two types of forces (traction of 200 gf and torsion of 20 N.cm) in two types of orthodontic mini-implants inserted at different (45° and 90° to the cortical bone) angles.Material and methodthree-dimensional models of two brands of mini-implant (SIN – Sao Paulo, Brazil, and RMO – South Korea) were exported and analyzed by finite element analysis (FEA). Analyses were performed on simulations of cortical bone, cancellous bone and the screw.ResultFEA analysis showed that RMO mini-implants had greater elastic deformation when subjected to tensile and torsional forces when compared with SIN mini-implants. For both trademarks and insertion angles tested, there was greater cortical bone deformation, but with the greatest strain located on the mini-implant. Tension on the mini-implant was located in its transmucosal profile region.ConclusionWhen comparing the two brands of mini-implants by FEA, it is fair to conclude that that the larger number of threads and their greater angle of inclination resulted in less resistance to deformation and induced a higher level of tension in the mini-implant and cortical bone when subjected to forces, especially when inserted at an angle of 45º to the cortical bone.


ResumoObjetivoO objetivo deste estudo foi avaliar as tensões e deformações de duas marcas comerciais de mini-implantes ortodônticos geradas após a aplicação de dois tipos de forças (de tração de 200 gf e torção de 20 N.cm) inseridos em duas angulações (45° e 90° em relação ao osso cortical).Material e métodoModelos tridimensionais das duas marcas de mini-implantes (SIN - Sao Paulo, Brasil, e RMO – Coréia do Sul) foram construídos e analisados por análise de elementos finitos (FEA). As análises foram realizadas em simulações no osso cortical, osso esponjoso e no parafuso.ResultadoA análise FEA mostrou que os mini-implantes da marca RMO apresentaram maior deformação elástica quando submetidos à tração e as forças de torção quando comparado aos mini-implantes da marca SIN. Em ambas as marcas testadas, e para os diferentes ângulos de inserção, houve uma maior deformação do osso cortical, com maior tensão localizado no mini-implante. A tensão no mini-implante foi localizado na região do perfil transmucoso.ConclusãoAo comparar as análises de elementos finitos das duas marcas comerciais de mini-implantes, concluiu-se que um maior número de roscas e maior inclinação resultam em menor resistência à deformação e induzem uma maior tensão no osso cortical quando submetidos à forças de torção e tração, especialmente quando inserido em um ângulo de 45º com o osso cortical.

13.
Dent. press implantol ; 9(2): 100-109, Apr.-Jun.2015. ilus, graf
Article in Portuguese | LILACS | ID: lil-790543

ABSTRACT

O objetivo desse trabalho foi avaliar, clínica e radiograficamente (bi/tridimensional), as alterações em tecidos moles e duros encontradas após a colocação de implantes imediatos com carga imediata em alvéolos pós-extração. Dez pacientes tratados com implantes imediatos com carga imediata nos incisivos central e lateral superiores foram incluídos. Parâmetros clínicos foram avaliados em fotografias padronizadas tiradas após a instalação do implante ( baseline ) e 1, 3 e 6 meses após. Parâmetros bi- e tridimensionais foram medidos em tomografias Cone-Beam, para avaliar a estabilidade do tecido ósseo na região vestibular. Também foram realizadas análises clínicas e fotográficas dos tecidos moles, para avaliar a sua estabilidade durante o período de avaliação. Não houve variações estatisticamente significativas nos parâmetros clínicos e radiográficos avaliados, tendo sido demonstrada uma manutenção de 94% do volume do osso vestibular. Implantes imediatos com carga imediata apresentam boa estabilidade dos tecidos moles e duros peri-implantares...


To evaluate by clinical and radiographic bi- and tridimensional means the soft and hard tissues alterations following immediate implant placement and loading in postextraction sockets in theanterior maxilla. Ten patients, treated with immediate-loaded implants in the maxillary central or lateral incisors, were evaluated in this study. Clinical parameters were evaluated in standardized pictures taken at baseline (immediately after), and 1, 3, and 6 months after provisional implant-supported single crown placement. Bi- and tridimensional radiographic parameters were evaluated from standardized digital periapical radiographies and from CBCT images. The volume of the buccal bone wall covering the central millimeter of the implant was also assessed in the CBCT images. The variation for all clinical, bi- and tridimensional parameters assessed was non-statistically significant. There was 94% maintenance of bone volume. The parameters assessed showed good clinical, bi- and tridimensional radiographic stability of soft and hard tissues for implants immediately placed and loaded in aesthetic zones...


Subject(s)
Humans , Jaw , Critical Pathways , Dental Implants, Single-Tooth , Gingiva , Immediate Dental Implant Loading , Osseointegration , Brazil , Esthetics, Dental , Incisor
14.
Braz. dent. j ; 26(1): 11-18, Jan-Feb/2015. graf
Article in English | LILACS | ID: lil-735833

ABSTRACT

The aim of this study was to determine the pattern of bone remodeling after maxillary sinus lifting in humans by means of fractal dimension (FD) and histomorphometric analysis. Therefore, the correlation between FD and the histomorphometric findings was evaluated. Sixteen patients with posterior edentulous maxilla were enrolled in this study. Maxillary sinus lifting was performed using autogenous bone grafted from the mandibular retromolar area. Three direct digital panoramic radiographs were obtained: before surgery (Group 1), immediately postoperatively (Group 2) and after 6 months of healing (Group 3) for FD analysis. Biopsies were taken after 6 months, processed and submitted to histological and histomorphometric analysis. Data were analyzed by Shapiro-Wilk test and ANOVA test followed by a Tukey test (a=0.05). The bone volume fraction of newly trabecular bone (TB) and medullary area (MA) was measured as 62.75%±17.16% and 37.25±17.16%, respectively. Significant difference in FD analysis was measured between Group 1 and Group 3. No significant difference was found in the correlation between FD and histomorphometric analysis for TB and MA (p=0.84). In conclusion, all performed analyses were effective in assessing the bone-remodeling pattern in the maxillary sinus, offering complementary information about healing and predictable outcomes. There were no correlations between FD and histomorphometric analysis.


O objetivo deste estudo foi determinar o padrão de remodelação óssea após levantamento de seio maxilar in humanos por meio de analise de dimensão fractal (FD) e histomorfometria. Além disso, a correlação entre FD e histomorfometria foi avaliada. Dezesseis pacientes com edentulismo na região posterior da maxila foram relacionados para este estudo. Levantamento de seio maxilar foi realizado utilizando-se enxerto de osso autógeno coletado da região retro molar da mandíbula. Três radiografias panorâmicas digitais foram obtidas: antes da cirurgia (Grupo 1), imediatamente após o levantamento de seio (Grupo 2) e após 6 meses de cicatrização (Grupo 3) para analise de FD. Biopsias foram coletadas após 6 meses, processadas e submetidas para analise histológica e histomorfométrica. Os dados foram analisados utilizando-se o teste Shapiro-Wilk e ANOVA seguido pelo pós teste de Tukey (a=0.05). A fração de volume de ósseo neoformado para o osso trabecular (TB) e para a área medular (MA) foi mensurado como 65,75%±17,16% and 37,25±17,16%, respectivamente. Diferença significante na analise FD foi observada entre os grupos 1 e 3. Nenhuma diferença estatística foi encontrada para correlação entre FD e histomorfometria para TB e MA (p=0,84). Em conclusão, todas as análises realizadas foram efetivas em acessar o padrão de remodelação ósseo no seio maxilar, oferecendo informações complementares sobre cicatrização e previsibilidade de resultados. Não houve correlação entre FD e histomorfometria.


Subject(s)
Humans , Male , Female , Middle Aged , Bone Transplantation/methods , Mandible/transplantation , Maxillary Sinus/surgery , Maxilla/surgery , Sinus Floor Augmentation/methods , Biopsy , Bone Remodeling , Dental Implantation, Endosseous , Fractals , Jaw, Edentulous, Partially/pathology , Jaw, Edentulous, Partially/surgery , Maxillary Sinus/pathology , Maxilla/pathology , Radiography, Panoramic , Transplantation, Autologous , Treatment Outcome , Wound Healing
15.
Braz. dent. j ; 26(1): 69-74, Jan-Feb/2015. tab, graf
Article in English | LILACS | ID: lil-735843

ABSTRACT

This study quantitatively assessed the periapical bone repair following endodontic surgery, using planimetric evaluation based on two- (conventional and digital intraoral radiographic images - IRs) and three-dimensional (cone beam computed tomography - CBCT) evaluation. Eleven maxillary anterior teeth (of 11 patients) with periapical bone lesions and indication for surgical endodontic treatment were selected. IRs and CBCT images were acquired before the endodontic surgery, and 48 h, 4, and 8-months after the surgery. In each period of evaluation, the area (mm2) of the bone lesion was measured in the images, and the values for the three methods were compared. The area in the CBCT images was measured in the mesio-distal sections comprising the largest diameter of the lesion. Data were submitted to repeated measures 2-way ANOVA and t-tests with Bonferroni correction. There was significant difference between the periods of evaluation (p=0.002) regarding the assessed periapical bone lesion area. There was no statistically significant difference between the methods of evaluation (p=0.023). In the CBCT images the lesion areas were 10% larger than those observed in the conventional IRs (22.84 mm2) and 15% larger than those observed in the digital IRs (21.48 mm2). From the baseline (40.12 mm2) to 4 (20.06 mm2) and 8-months (9.40 mm2), reductions of 50 and 77% in the lesion area, respectively, were observed (p<0.0001). From 4 to 8-months, this value was 53%. Progressive bone repair could be seen from 48h to 8-months following endodontic surgery based on two- (conventional and digital IRs) and three-dimensional (CBCT) evaluation. CBCT images provided results similar to those assessed by means of IRs.


Este estudo avaliou quantitativamente a reparação óssea periapical após cirurgia parendodôntica, utilizando avaliação planimétrica bidimensional (imagens convencionais e digitais intraorais radiográficas-IRs) e tridimensional (CBCT). Onze dentes anteriores da maxila (de 11 pacientes) com lesões ósseas periapicais e indicação de tratamento endodôntico cirúrgico foram selecionados. IRs e imagens tomográficas foram obtidas antes da cirurgia parendodôntica, e 48 h, 4 e 8 meses após a cirurgia. Para cada período, a área (mm2) de rarefação óssea foi mensurada, e os valores para os três métodos comparados. A área nas imagens de CBCT foi mensurada nas seções mésio-distal, compreendendo o maior diâmetro da lesão. Os dados foram submetidos à análise de variância de medidas repetidas a dois critérios e teste T com correção de Bonferroni. Houve diferença significativa entre os períodos de avaliação (p=0,002) em relação à área de lesão óssea periapical mensurada. Não houve diferença significativa entre os métodos de avaliação (p=0,023). Nas imagens tomográficas as áreas das lesões foram 10% maiores do que as observados nas IRs convencionais (22,84 mm2) e 15% maior do que àquelas das digitais (21,48 mm2). A partir dos valores baseline (40,12 mm2) a 4 (20,06 mm2) e 8 meses (9,40 mm2), foram observadas reduções de 50 e 77%, respectivamente, na área das lesões (p<0,0001). De 4 a 8 meses, esse valor foi de 53%. Entre o período de 48h a oito meses após as cirurgias parendodônticas foram observadas reparações ósseas progressivas nas avaliações bidimensionais (IRs convencional e digital) e tridimensional (CBCT). A CBCT produziu resultados semelhantes aqueles avaliados por meio das IRs.


Subject(s)
Humans , Male , Female , Adult , Alveolar Bone Loss/diagnostic imaging , Cone-Beam Computed Tomography/methods , Imaging, Three-Dimensional/methods , Incisor/diagnostic imaging , Incisor/surgery , Maxilla/diagnostic imaging , Radiography, Dental/methods , Root Canal Therapy/methods , Treatment Outcome
16.
Rev. odontol. UNESP (Online) ; 44(1): 37-43, Jan-Feb/2015. graf
Article in Portuguese | LILACS-Express | LILACS | ID: lil-742104

ABSTRACT

OBJETIVO: Avaliar histomorfometricamente o efeito de biovidro (B), osso bovino liofilizado (OB) ou da mistura desses dois biomateriais (B/OB - 1:1) no reparo de defeitos ósseos críticos em calvária de ratos. MATERIAL E MÉTODO: Defeitos ósseos (8 mm Ø) foram criados cirurgicamente na calvária de 24 ratos, distribuídos em 4 grupos com 6 animais, de acordo com o tipo de biomaterial: coágulo sanguíneo (GC), biovidro (GB), osso bovino liofilizado (GOB) e a mistura desses dois biomateriais (GB/OB). Os animais foram eutanasiados após 15 e 60 dias do procedimento cirúrgico (3 animais por período). A avaliação histológica foi baseada na descrição da morfologia dos tecidos neoformados, enquanto para a avaliação histomorfométrica foi realizada quantificação da porcentagem de tecido ósseo, de tecido conjuntivo fibroso neoformados e de biomaterial remanescente no defeito ósseo. RESULTADO: Nos dois períodos experimentais, a análise histológica apresentou neoformação óssea, principalmente nas bordas dos defeitos, e ao redor de partículas de biomateriais remanescentes. A avaliação histomorfométrica demonstrou que no período de 15 dias o grupo GC apresentou maior percentagem de tecido ósseo em relação aos demais grupos estudados, enquanto que aos 60 dias o grupo GOB apresentou maior porcentagem de tecido ósseo em relação ao grupo GB. CONCLUSÃO: O osso bovino liofilizado apresentou maior formação óssea em relação ao biovidro, mas nenhum dos biomateriais foi superior ao coágulo. A associação do biovidro e osso bovino liofilizado não adicionou vantagem à formação óssea. .


OBJECTIVE: This study sought to histomorphometrically evaluate the effect of bioglass (B), lyophilized bovine bone (BB) or the 1:1 mixture of these two biomaterials on the repair of critical bone defects in rat calvaria. MATERIAL AND METHOD: Bone defects (8 mm Ø) were surgically created in the calvaria of 24 rats, which were divided into the following 4 groups of 6 animals each according to the type of biomaterial used: blood clot / coagulum (control) group (CG), bioglass group (BG), lyophilized bovine bone group (BBG) and a group receiving a mixture of these two biomaterials (BG/BB). The animals were euthanized at 15 or 60 days after surgery (3 animals per period). Histological evaluation was based on the morphological description of the newly formed tissues, and a quantification of the percentage of bone tissue with newly formed fibrous connective tissue and the percentage of biomaterial remaining in the bone defect was performed for the histomorphometric evaluation. RESULT: In both experimental periods, the histological analysis showed new bone formation, especially at the edges of the defects and around remaining biomaterial particles. Histomorphometric analysis showed that the CG contained a higher percentage of bone tissue over the 15-day period compared to that of the other groups. At 60 days, the BBG showed a higher percentage of bone tissue compared to that of the BG (p <0.01). CONCLUSION: Lyophilized bovine bone led to greater bone formation compared to bioglass, but none of the biomaterials was superior to blood clot. Moreover, the combination of bioglass and lyophilized bovine bone did not provide an advantage for bone formation. .

17.
ImplantNews ; 12(5): 582-587, 2015. tab
Article in Portuguese | LILACS, BBO | ID: lil-767516

ABSTRACT

Objetivo: avaliar a remodelação óssea radiográfica ao redor de implantes hexágono externo (EH) que possuem roscas no módulo da crista. Material e métodos: doze pacientes desdentados totais receberam quatro implantes (Ø 3,8 mm x 13 mm) customizados na região interforaminal. Doze desses implantes foram hexágono externo com roscas no módulo da crista. Todos os pacientes receberam uma prótese implantossuportada imediata. A distância entre o topo do implante e o primeiro contato osso/implante (IT-FBIC) foi avaliada em radiografias periapicais digitais padronizadas adquiridas em um, três, seis e 12 meses de acompanhamento. A comparação entre vários períodos de observação foi realizada utilizando análise de variância (Anova) para medidas repetidas, seguida pelo teste post-hoc de Tukey. Resultados: a variação radiográfica da perda óssea peri-implantar foi significativamente diferente entre os períodos de acompanhamento (p < 0,001). A média de IT-FBIC foi de 1,17 ± 0,44 mm, depois de 12 meses de carregamento funcional. Conclusão: a remodelação óssea peri-implantar ocorrerá para implantes com hexágono externo, independentemente da presença de elementos de retenção no módulo da crista do implante


Objective: to evaluate the radiographic bone remodeling around implants using external hexagon (EH) with a threaded implant crestal module. Material and methods: twelve patients with totally edentulous mandibles received four custom-made (Ø 3.8 x 13 mm) implants in the interforaminal region. Twelve of the implants were external hexagon with a threaded implant crestal module. All patients received an immediate implant-supported prosthesis. The distance between the top of the implant and the first bone-to-implant contact (IT-FBIC) was evaluated on standardized digital periapical radiographs acquired at one, three, six, and 12 months of follow-up. Comparison among multiple observation periods was performed using repeated-measures analysis of variance (Anova), followed by a Tukey post-hoc test. Results: the radiographic periimplant bone loss was significantly different among the follow-up periods (p < 0.001). Mean IT-FBIC was 1.17 mm ± 0.44 mm, at 12 months follow-up period. Conclusions: radiographic periimplant bone remodeling will occur for implants using external hexagon, regardless of the presence of retention elements at the implant crestal module.


Subject(s)
Humans , Male , Female , Young Adult , Middle Aged , Bone Remodeling , Dental Implants , Osseointegration
18.
Braz. j. oral sci ; 13(4): 288-291, Oct-Dec/2014. tab, graf
Article in English | LILACS, BBO | ID: lil-732340

ABSTRACT

Aim: To evaluate prospectively the upper airway of 16 patients submitted to surgically assisted rapid maxillary expansion. Methods: Volumetric tomography acquisitions were done preoperatively (T1) and after six months postoperatively (T2), the slices were obtained from the hard palate to the third cervical vertebra (C3), the images were imported and reconstructed in the Dolphin software for 2D definition of the upper airway. A cephalometric radiograph was generated by the software, the cephalometric points were traced at T1 and T2 for all patients in a dark environment always by the same operator and the Arnett-Gunson FAB Surgery analysis was applied. Results: A statistically significant reduction in area (p=0.03) at the level of the nasopharynx was observed, while at the oropharynx and hypopharynx it showed no statistical difference between T1 and T2. Conclusions: The area in the nasopharynx level presented a statistically significant decrease, however, despite the area decrease at this point, the patients seem to do better, and thus, this area decrease may not be clinically significant.


Subject(s)
Humans , Male , Female , Adult , Palatal Expansion Technique , Facial Asymmetry , Orthognathic Surgery
19.
ImplantNews ; 10(6): 735-742, 2013. ilus
Article in Portuguese | LILACS, BBO | ID: lil-707607

ABSTRACT

O objetivo deste estudo foi apresentar um caso clínico, suportado por achados tomográficos e histológicos, de regiões enxertadas com HA+β-TCP (hidroxiapatita + beta fosfato tricálcio, BoneCeramic) ou osso bovino inorgânico liofilizado (Bio-Oss), em um procedimento de elevação bilateral da mucosa do seio maxilar. A necessidade de enxerto ósseo, para viabilizar a instalação de implantes na maxila posterior foi comprovada pela altura óssea residual inferior a 5 mm, bilateralmente, avaliada por tomografia computadorizada de feixe cônico em paciente edêntulo total, usuário de prótese total convencional. Após a osteotomia de acesso ao seio maxilar e o descolamento da mucosa sinusal, foi realizado o preenchimento da cavidade com substituto ósseo bovino inorgânico liofilizado (Bio-Oss) na maxila direita e com HA+β-TCP (BoneCeramic) na maxila esquerda. Nova tomografia computadorizada foi realizada oito meses após o procedimento de enxertia, e demonstrou ganho de tecido mineralizado em altura nas regiões enxertadas, compatível com a instalação de implantes. No ato da instalação dos implantes foram obtidas biópsias das áreas enxertadas com auxílio de broca trefina. A análise histológica demonstrou que, nas áreas em que ambos os enxertos foram realizados, havia remanescente do biomaterial sempre rodeado por tecido ósseo neoformado e tecido conjuntivo mole. Entretanto, a análise qualitativa subjetiva sugere uma tendência maior de presença de material mineralizado quando o osso bovino inorgânico liofilizado (Bio-Oss) foi utilizado. Dentro do limite deste estudo, pôde-se concluir que ambos os materiais, quando utilizados em procedimentos de enxertia para aumento ósseo no assoalho do seio maxilar em humanos, foram capazes de promover o ganho em altura óssea, apresentando comportamento clínico e tomográfico semelhantes depois de oito meses.


The aim of this study was to report a clinical case, supported by CBCT and histological findings, of regions grafted with HA + β-TCP (hydroxyapatite + beta tricalcium phosphate, BoneCeramic) or inorganic bovine bone lyophilized (Bio-Oss) for bilateral maxillary sinus lifting. The need for bone grafting in the posterior maxilla was confirmed by residual bone heights of less than 5 mm, in a totally edentulous patient, wearing a conventional total prosthesis. After osteotomy and detachment of the sinus mucosa, the formed cavities were filled with Bio-Oss (right side) and BoneCeramic (left side). A new CBCT scan was performed eight months after grafting procedure, and demonstrated gain of mineralized tissue height in the grafted regions, consistent with placement implant. After installation of the implants, biopsies were retrieved from the grafted areas with the aid of a trephine bur. Histological analysis demonstrated that, remaining biomaterial particles were always surrounded by newly formed bone and soft tissue in both sides. However, the subjective qualitative analysis suggests the presence of a larger trend of mineralized material when lyophilized inorganic bovine bone (Bio-Oss) was used. Within the limits of this study, it can be concluded that both materials were able to promote significant gain in bone maxillary height after eight months.


Subject(s)
Humans , Female , Middle Aged , Biocompatible Materials , Bone Transplantation , Dental Implants , Maxillary Sinus
20.
Perionews ; 7(2): 162-168, 2013. ilus
Article in Portuguese | LILACS, BBO | ID: lil-689061

ABSTRACT

Algumas regiões da cavidade oral apresentam condições anatômicas que parecem interferir negativamente no resultado do recobrimento de recessões gengivais. Dessa forma, o objetivo desse relato de caso foi apresentar duas cirurgias de recobrimento de recessões gengivais em dentes mandibulares executadas no mesmo paciente com o acompanhamento de 24 meses. Paciente RP, 35 anos, gênero masculino, leucoderma, não fumante, sistematicamente saudável, procurou atendimento na clínica do curso de especialização em Periodontia da Faculdade de Odontologia de Araraquara – Foar-Unesp. Sua queixa principal eram recessões inferiores nos dentes 33, 34, 35 e 43, 44 e 45. Além do incômodo estético, o paciente relatava sensibilidade dentinária ocasional. Para resolução do caso foi indicada a técnica de enxerto conjuntivo subepitelial associada ao retalho pediculado reposicionado coronalmente. Após dois anos do procedimento cirúrgico, percebeu-se excelente recobrimento radicular com significante melhora estética do caso. Pôde-se concluir que a técnica de enxerto conjuntivo subepitelial foi eficaz no recobrimento de recessões gengivais do tipo Classe I de Miller, mesmo em uma região de difícil execução da técnica.


Subject(s)
Humans , Male , Adult , Connective Tissue , Esthetics, Dental , Free Tissue Flaps , Gingival Recession
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