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1.
Braz. dent. j ; 34(3): 129-135, May-June 2023. tab
Article in English | LILACS-Express | LILACS, BBO | ID: biblio-1447603

ABSTRACT

Abstract This case-control study evaluated the gene expression levels of interleukin (IL)-4, macrophage inflammatory protein type 1 alpha (MIP-1α), and metalloproteinase (MMP)-9, factors involved in the formation of giant cells in healthy peri-implant tissue and peri-implantitis. Thirty-five subjects (15 healthy and 20 with peri-implantitis), who met the inclusion and exclusion criteria, were included in this study. The peri-implant tissue biopsies were subjected to total RNA extraction, DNAse treatment, and cDNA synthesis. Subsequently, the reaction of real-time PCR was performed to evaluate the gene expression levels of IL-4, MIP-1α, and MMP-9 concerning the reference gene. IL-4 gene expression showed higher (18-fold) values in the Peri-Implantitis Group of Patients when compared with the Healthy (Control) Group (p<0.0001). Although MIP- 1α and MMP-9 gene expression levels were higher in diseased implants, they showed no significant differences (p=0.06 and p=0.2337), respectively. Within the limitations of this study, the results showed that in tissues affected by peri-implantitis, only levels of Il-4 were increased when compared with tissues in the control group.


Resumo Este estudo caso-controle teve como objetivo avaliar a expressão gênica dos níveis de interleucina (IL)-4, proteína inflamatória de macrófagos tipo alfa 1 (MIP-1α) e metalopreoteinase (MMP)-9, todos fatores envolvidos na formação de células gigantes em tecidos peri-implantares saudáveis e com peri-implantite. Trinta e cinco indivíduos (15 saudáveis e 20 com peri-implantite) foram incluídos nesse estudo seguindo os critérios de inclusão e exclusão. Os tecidos peri-implantares foram submetidos a extração do RNA total, tratamento de DNAse e síntese de cDNA. Subsequentemente, a reação de PCR em tempo real foi realizada para avaliar os níveis da expressão de IL-4, MIP-1α, e MMP-9 em relação ao gene de referência. O nível de expressão de IL-4 foi estatisticamwente maior (18 vezes) nos tecidos de pacientes com peri-implantite quando comparados aos pacientes saudáveis (grupo controle) (p<0,0001). Embora os níveis de expressão de MIP- 1α e MMP-9 apresentassem maiores valores nos implantes doentes, esses níveis não foram estatisticamente significantes (p=0.06 and p=0.2337) respectivamente. Dentro das limitações desse estudo, os resultados mostraram que nos tecidos afetados pela peri-implantite, apenas os nívies de IL-4 estavam aumentados quando comparados ao grupo controle.

2.
Braz. dent. sci ; 25(4): 1-14, 2022. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1410422

ABSTRACT

Objective: it is important to know the thicknesses of the alveolar bone plates (ABPs) based on the current literature for the planning and success of orthodontic treatment. However, studies have scientific limitations regarding ABPs as the image resolution is not adequate and is restricted to a few teeth or buccal face only. This study was aimed at reporting a reference standard for bone plates of upper teeth, in which 15 patients (mean age of 21.79 years) with balanced occlusion and a harmonious facial profile were evaluated using cone-beam computed tomography at a voxel size of 0.1 mm. Material and Methods: bone tissues of the cervical, middle, and apical thirds of the root (buccal and palatal), the distance between cement-enamel junction (CEJ) and alveolar bone crest (ABC), and inclination of the teeth to the palatal plane were evaluated. Paired t-test, Spearman's correlation tests, and linear regression tests were used (P < 0.05). Results: the buccal distance between the CEJ and ABC was greater than the palatal one in all pairs of teeth. Most of the bone tissues had a thickness ≤ 1 mm in the buccal face, whereas in the cervical-apical direction, the thickness was ≥ 2 mm. There is no equivalence between genders in the sample. Conclusion: the reduced buccal bone architecture around the first premolars was indicative of local gingival recessions, and the lack of gender uniformity was suggestive of individual evaluation. References of normal bone tissue determining the orthodontic limits were provided to assist in the treatment planning. (AU)


Objetivo: é importante conhecer as espessuras das cristas ósseas alveolares (COAs) com base na literatura atual para o planejamento e sucesso do tratamento ortodôntico. No entanto, os estudos apresentam limitações científicas em relação às COAs, pois a resolução da imagem não é adequada e está restrita apenas a alguns dentes ou face vestibular. Este estudo teve como objetivo descrever um padrão de referência para corticais ósseas de dentes superiores, no qual 15 pacientes (idade média de 21,79 anos) com oclusão equilibrada e perfil facial harmonioso foram avaliados por meio de tomografia computadorizada de feixe cônico no tamanho de voxel de 0,1 mm. Material e Métodos: os tecidos ósseos dos terços cervical, médio e apical da raiz (vestibular e palatina), a distância entre a junção cemento-esmalte (JCE) e a crista óssea alveolar (COA) e a inclinação dos dentes ao plano palatino foram avaliados. Foram utilizados o teste t pareado, os testes de correlação de Spearman e os testes de regressão linear (P < 0,05). Resultados: a distância vestibular entre a JEC e a COA foi maior que a palatina em todos os pares de dentes. A maioria dos tecidos ósseos apresentou espessura ≤ 1 mm na face vestibular, enquanto no sentido cérvico-apical a espessura foi ≥ 2 mm. Não há equivalência entre os gêneros na amostra. Conclusão: a arquitetura óssea vestibular reduzida ao redor dos primeiros pré-molares foi indicativa de recessões gengivais locais, e a falta de uniformidade de gênero foi sugestiva de avaliação individual. Referências de tecido ósseo normal determinando os limites ortodônticos foram fornecidas para auxiliar no planejamento do tratamento. (AU)


Subject(s)
Humans , Male , Female , Adolescent , Adult , Orthodontics , Bone and Bones , Cone-Beam Computed Tomography , Alveolar Process , Diagnosis
3.
Braz. oral res. (Online) ; 35(supl.2): e101, 2021.
Article in English | LILACS-Express | LILACS, BBO | ID: biblio-1339467

ABSTRACT

Abstract When periodontal disease is diagnosed, it is difficult to predict the clinical response of treatment of a tooth over time because the result of treatment is affected by several factors and will depend on the maintenance and support of periodontal treatment. Rehabilitation with removable dental prostheses, fixed prostheses, and dental implants makes it possible to restore the function and esthetics of patients with tooth loss due to periodontal disease. The predictive factors of tooth loss in periodontitis patients should be assessed by dentists to inform their clinical decision-making during dental treatment planning. This will provide detailed individualized information and level of risk of patients considered suitable for dental rehabilitation. Therefore, the aim of this article was to review the subject of "Impact of tooth loss due to periodontal disease on the prognosis of rehabilitation" and the effect of fixed, removable, and implant-supported prostheses in periodontal patients.

4.
Braz. oral res. (Online) ; 33(supl.1): e080, 2019. tab, graf
Article in English | LILACS | ID: biblio-1039310

ABSTRACT

Abstract The aim of this study was to evaluate the effects of adjunct systemic antibiotic treatment with metronidazole (MTZ) and amoxicillin (AMX) in patients receiving non-surgical subgingival debridement (NSD) for peri-implantitis. Forty subjects presenting with at least one implant with severe peri-implantitis were randomized into an experimental group [treated with NSD plus MTZ (400 mg) and AMX (500 mg) three times a day for 14 days] and a control group treated with NSD plus placebo. Clinical parameters and submucosal biofilm profiles were evaluated up to 1 year post-treatment. Overall, both treatments improved clinical parameters over time. At 1 year, mean probing depth (PD), mean clinical attachment (CA) level and proportions of red complex pathogens did not differ significantly between the two groups. In addition, mean PD and CA changes to 1-year posttreatment did not differ significantly between the two groups between baseline and 1-year post-treatment. These results suggest that the addition of MTZ and AMX to the treatment protocol of patients undergoing NSD for with severe peri-implantitis does not improve the clinical and microbiological outcomes of NSD. The fact that half of the implants in both groups did not achieve clinical success (PD < 5 mm, no BoP, no bone loss) suggest that neither of the tested protocols were effective for treating severe peri-implantitis.


Subject(s)
Humans , Male , Female , Middle Aged , Aged , Peri-Implantitis/drug therapy , Amoxicillin/therapeutic use , Metronidazole/therapeutic use , Anti-Bacterial Agents/therapeutic use , Reference Values , Time Factors , Periodontal Index , Reproducibility of Results , Follow-Up Studies , Treatment Outcome , Statistics, Nonparametric , Drug Combinations , Peri-Implantitis/microbiology , Middle Aged
6.
Braz. oral res. (Online) ; 33(supl.1): e069, 2019. tab, graf
Article in English | LILACS | ID: biblio-1039318

ABSTRACT

Abstract Observational studies have indicated that crestal bone level changes at implants are typically associated with clinical signs of inflammation, but still mechanical overload has been described as possible factor leading to hard-tissue deficiencies at implant sites without mucosal inflammation. The aim of this paper was systematically review the literature regarding the possible effect of traumatic occlusal forces on the peri-implant bone levels. Literature search was conducted using PubMed, Scielo and Lilacs, including the following terms: oral OR dental AND implant$ AND (load OR overload OR excessive load OR force$ OR bruxism) AND (bone loss OR bone resorption OR implant failure$). Databases were searched for the past 10 years of publications, including: clinical human studies, either randomized or not, cohort studies, case control studies, case series and animal research. Exclusion criteria were review articles, guidelines and in vitro and in silico (finite element analysis) research, as well as retrospective studies. The PICO questions formulated was: "does traumatic occlusal forces lead to peri-implant bone loss?" The database searches as well as additional hand searching, resulted in 807 potentially relevant titles. After inclusion/exclusion criteria assessment 2 clinical and 4 animal studies were considered relevant to the topic. The included animal studies did not reveal an association between overload and peri-implant bone loss when lower overloads were applied, whereas in the presence of excessive overload it seemed to generate peri-implant bone loss, even in the absence of inflammation. The effect of traumatic occlusal forces in peri-implant bone loss is poorly reported and provides little evidence to support a cause-and-effect relationship in humans, considering the strength of a clinically relevant traumatic occlusal force.


Subject(s)
Humans , Bite Force , Bruxism/complications , Alveolar Bone Loss/etiology , Dental Occlusion, Traumatic/complications , Time Factors , Bone Resorption/etiology , Treatment Failure , Peri-Implantitis/etiology
7.
Braz. oral res. (Online) ; 33(supl.1): e073, 2019. tab, graf
Article in English | LILACS | ID: biblio-1039320

ABSTRACT

Abstract Soft tissue defects around dental implants, such as papilla or volume loss, peri-implant recession and alterations of the ridge color and/or texture, lead to esthetic and functional complaints. Treatments of these defects in implants are more demanding than in teeth because peri-implant tissue exhibits different anatomical and histological characteristics. This narrative review discusses the proposed treatments for soft tissue defects around implants in the current literature. Several clinical and pre-clinical studies addressed methods to augment the quantity of the peri-implant keratinized mucosa. Autogenous grafts performed better than soft tissue substitutes in the treatment of soft tissue defects, but there is no clinical consensus on the more appropriate donor area for connective tissue grafts. Treatment for facial volume loss, alterations on the mucosa color or texture and shallow peri-implant recessions are more predictable than deep recessions and sites that present loss of papilla. Correction of peri-implant soft tissue defects may be challenging, especially in areas that exhibit larger defects and interproximal loss. Therefore, the regeneration of soft and hard tissues during implant treatment is important to prevent the occurrence of these alterations.


Subject(s)
Humans , Dental Implants/adverse effects , Alveolar Bone Loss/therapy , Bone-Implant Interface/pathology , Bone-Anchored Prosthesis/adverse effects , Gingival Recession/therapy , Reproducibility of Results , Alveolar Bone Loss/etiology , Alveolar Bone Loss/pathology , Treatment Outcome , Face/pathology , Gingival Recession/etiology , Gingival Recession/pathology
8.
ImplantNewsPerio ; 3(1): 25-37, jan.-fev. 2018. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-881395

ABSTRACT

A tela de titânio é um recurso importante e amplamente utilizado em diversos tipos de enxertos ósseos. Contudo, apresenta um alto índice de exposição, o que pode comprometer total ou parcialmente o tratamento. Nesse contexto, é importante o profissional compreender diferentes formas de lidar com essa intercorrência, possibilitando o melhor prognóstico possível do enxerto, além de diminuir o desconforto do paciente. O presente trabalho apresenta um caso clínico de enxerto particulado com tela de titânio na região anterior da maxila, com exposição precoce e persistente do enxerto, mesmo frente a diferentes intervenções. O relato descreve as abordagens envolvidas em diferentes momentos da exposição e discute os aspectos teóricos e práticos envolvidos, incluindo a etiologia, os biomateriais utilizados, sua relação com exposições ao meio bucal e as prováveis razões pela quais o enxerto não apresentou perda significante de volume, mesmo após 41 dias exposto ao meio bucal.


Titanium mesh is an important and widely used resource in several types of bone grafts. However, it has a high prevalence of exposure, which may partially or totally compromise the treatment. In this sense, it is important for the professional to understand different ways of dealing with this problem, allowing the best possible prognosis of the graft, besides reducing the discomfort of the patient. The present work presents a case report of particulate graft with titanium mesh in the anterior region of the maxilla, with early and persistent graft exposure, even in front of different interventions. This report describes the approaches involved in different times of exposition and discusses the theoretical and practical aspects involved, including etiology, the biomaterials used, its relation with exposures to the oral environment and the likely reasons why the graft did not present signifi cant loss of volume, even after 41 days exposed to the mouth.


Subject(s)
Humans , Female , Adult , Biocompatible Materials , Bone Regeneration , Bone Transplantation/methods , Dental Implantation/methods , Particulate Matter , Titanium
9.
ImplantNewsPerio ; 3(1): 51-56, jan.-fev. 2018. tab
Article in Portuguese | LILACS, BBO | ID: biblio-881576

ABSTRACT

Objetivo: a objetivo desta revisão sistemática foi avaliar estudos clínicos e as taxas de sucesso e complicações protéticas das próteses fixas totais cerâmicas implantossuportadas em pacientes totalmente desdentados, após um período de acompanhamento mínimo de 5 anos. Material e métodos: a pesquisa bibliográfica foi realizada usando as bases de dados eletrônicas Medline/PubMed, entre 1980 a 2015, para estudos clínicos em língua inglesa relatando as complicações protéticas e implantares. Os termos de pesquisa que foram utilizados, isoladamente ou em combinação foram implant-supported restoration, prosthodontic complications, technical complications, mechanical complications, dental implants, screw complications, edentulous arch, metal framework fracture, restoration, acrylic veneer fracture, ceramic veneer fracture, biologic complications e edentulous arch. Resultados: dos 181 artigos recuperados, apenas três estudos cumpriram os critérios de inclusão para esta revisão, sendo três estudos prospectivos. As complicações biológicas e técnicas em implantes e próteses foram identificadas e registradas, incluindo: fraturas dos materiais de suporte da estrutura/recobrimento, soltura do parafuso da prótese e/ou parafuso do pilar, fratura do parafuso protético e/ou parafuso do pilar, deficiências estéticas e desgaste do material. Conclusão: dentro dos limites desta revisão sistemática, os estudos sobre materiais cerâmicos com cinco anos ou mais de acompanhamento são escassos ou inexistentes sugerindo cautela na utilização desse tipo de restauração implantossuportada.


Objective: the objective of this systematic review was to access the clinical studies and as success rates and prosthetic complications of total fi xed ceramic prostheses implanted in fully edentulous patients after a minimum follow-up period of 5 years. Material and methods: a literature search was conducted using Medline/PubMed electronic databases from 1980 to 2015 for English-language clinical studies reporting as prosthetic and implant complications. "Technical complications", "mechanical complications", "dental implants", "screw complications", "edentulous arch", "technical complications", "technical complications". "Fracture of metal structure", "restoration", "acrylic veneer fracture", "ceramic veneer fracture", "biological complications" and "edentulous arch". Results: from the 181 articles retrieved, only 3 studies fullfi lled the inclusion criteria for this review, being prospective studies. Such biological and technical complications in implants and prostheses were identifi ed and recorded, including: structure/veneering material fractures, prosthetic screw loosening and/or abutment screw, prosthetic and/or abutment screw fracture, defi cient esthetics, and material wear. Conclusion: within the limits of this systematic review, studies on ceramic materials with 5 years of follow-up are scarce or non-existent suggesting caution in the use of this type of implant-supported restoration.


Subject(s)
Humans , Male , Female , Ceramics , Dental Implantation , Dental Prosthesis, Implant-Supported , Denture, Complete , Metal Ceramic Alloys , Prostheses and Implants
10.
ImplantNewsPerio ; 2(5): 845-848, set.-out. 2017. tab
Article in Portuguese | LILACS, BBO | ID: biblio-877276

ABSTRACT

Objetivo: analisar o sucesso do tratamento através de implantes cônicos de hexágono externo e interno, de superfície jateada com Al2O3 seguido de três ataques ácidos, com acompanhamento clínico de sete anos. Material e métodos: foi realizado um estudo retrospectivo aprovado pelo comitê de ética da Universidade de Guarulhos, entre os anos de 2009 e 2016, no qual foram selecionados 136 pacientes após os critérios de inclusão e exclusão, sendo instalados 774 implantes cônicos de hexágono externo e interno nos maxilares. Após o tempo de osseointegração, os implantes receberam as coroas protéticas finais. Resultados: a avaliação retrospectiva de 774 implantes cônicos de hexágono externo e interno, de superfície jateada com Al2O3 seguido de três ataques ácidos, com um acompanhamento clínico de sete anos, resultou em índices totais de sucesso na osseointegração de 98,39%, com uma perda óssea marginal de 1,08 mm após este período. Conclusão: a previsibilidade de sucesso no tratamento através dos implantes cônicos de hexágono externo e interno, de superfície jateada com Al2O3 seguido de três ataques ácidos, foi de 98,3%. A qualidade óssea é fundamental na previsibilidade do tratamento.


Objective: to analyze the treatment success of Al2O3 sandblasted, acid-etched, external and internal tapered connection dental implants after 7 years of follow-up. Material and methods: upon approval by the Ethics Committee of the University of Guarulhos, a retrospective study involving 136 patients receiving 774 dental implants in the jaws was performed. After the osseointegration period, definitive prosthetic restorations were delivered. Results: after 7 years of follow-up, the overall success rate was of 98.33% with a marginal bone loss of 1.08 mm. Conclusion: the treatment predictability of alumina sandblasted, external and internal tapered implants was significant. Bone quality is fundamental for treatment success.


Subject(s)
Humans , Dental Implantation, Endosseous , Dental Implantation/methods , Dental Prosthesis , Osseointegration
11.
ImplantNewsPerio ; 2(2): 227-233, mar.-abr. 2017. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-847144

ABSTRACT

Objetivo: avaliar, por meio de um microdurômetro, o grau de desajuste na adaptação de pilares Ucla em implantes. Material e métodos: foram utilizados dez implantes de hexágono interno de plataforma regular, e seus respectivos componentes protéticos do tipo Ucla com antirrotacional, como seguem: dez pilares Ucla totalmente calcináveis e dez pilares Ucla com base de CoCr. Todos os pilares Ucla foram fundidos pelo mesmo laboratório de prótese e pelo mesmo processo laboratorial. Cada implante recebeu apenas dois pilares, que foram anexados por meio de um parafuso de titânio quadrado utilizando-se torque de 30 Ncm com torquímetro manual. Cada conjunto implante/pilar recebeu quatro marcações aleatórias em torno da circunferência, na qual foram feitas as medições do espaço existente entre as peças utilizando uma lupa estereoscópica de 100 vezes de aumento. Resultados: os resultados obtidos mostraram diferenças significativas entre os grupos submetidos ao teste Mann-Whitney (p < 0,05). Conclusão: o pilar Ucla com base de CoCr apresentou menor desajuste marginal vertical, quando comparado ao pilar Ucla totalmente calcinável, após o processo de fundição nos implantes de hexágono interno.


Objective: to evaluate, using a microhardness device, the misfit between Ucla abutments and internal hex implants. Material and methods: 10 internal hex implants received 10 Ucla burnout and 10 Ucla abutments with CoCr collar. All the abutments were cast in the same laboratory and under the same protocol. A square-head titanium screw was tightened to a 30 Ncm using a manual wrench. Each abutment/implant set receive four random markings around its perimeter. A stereoscopic lens was used to investigate the misfi t at 100 magnification. Results: there was a statistically significant difference between tested abutments (Mann-Whitney p < 0.05). Conclusion: the Ucla abutment with the CoCr collar presented less vertica misfit values after casting for internal hex dental implants.


Subject(s)
Data Interpretation, Statistical , Dental Casting Investment , Dental Casting Technique/instrumentation , Dental Prosthesis Design , Dental Prosthesis, Implant-Supported , Dental Prosthesis, Implant-Supported/adverse effects
12.
ImplantNewsPerio ; 2(2): 247-257, mar.-abr. 2017. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-847148

ABSTRACT

O PRF líquido pode facilitar o posicionamento e a escultura de enxertos ósseos particulados, além dos possíveis benefícios relacionados ao reparo ósseo e fibromucosa. Para tanto, é necessário que o profissional conheça os aspectos práticos e teóricos envolvidos no seu uso. Um paciente com 45 anos de idade, apresentava perda dos incisivos maxilares e de espessura da crista óssea na região, impossibilitando a colocação de implantes de diâmetro convencional. Para a regeneração óssea, foi utilizado enxerto com substituto ósseo associado a coágulos de PRF, PRF líquido e tela de titânio. Após o reparo ósseo, foram instalados dois implantes na região dos incisivos laterais como pilares de uma prótese parcial fixa de quatro elementos. O PRF líquido pode facilitar procedimentos de enxertia óssea e diminuir o risco de iatrogenia sem, contudo, aumentar significativamente o custo e o tempo do tratamento.


The liquid PRF can facilitate the positioning and carving of particulate bone grafts, in addition to possible benefi ts related to bone and soft tissue repair. Therefore, it is necessary that the professional knows the practical and theoretical aspects involved in its use. A 45-year-old patient presented loss of maxillary incisors and thickness of the bone crest in the region, making it impossible to place implants of conventional diameter. For bone regeneration, graft was used with bone substitute associated with PRF clots, liquid PRF and titanium mesh. After bone repair, two implants were installed in the region of the lateral incisors as pillars of a fixed partial denture of four elements. The liquid PRF can facilitate bone graft procedures and reduce the risk of iatrogenic, without, however, significantly increasing the cost and time of treatment.


Subject(s)
Humans , Female , Middle Aged , Biocompatible Materials , Bone Substitutes/therapeutic use , Bone Transplantation/methods , Dental Implantation , Dental Prosthesis, Implant-Supported , Platelet-Rich Plasma
13.
ImplantNewsPerio ; 2(3): 433-440, mai.-jun. 2017. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-847254

ABSTRACT

O uso de membranas em casos de regeneração óssea guiada tornou-se comum e representa um recurso para ganho de tecido ósseo. As membranas de politetrafluoretileno denso (d-PTFE) são uma opção quando há necessidade de mantê-las expostas ao meio bucal. Neste estudo, relata-se a utilização de uma membrana d-PTFE para regeneração óssea em alvéolo pós-extração em região estética.


The use of membranes in cases of guided bone regeneration has become common and represents a resource for bone tissue gain. Dense polytetrafl uoroethylene (d-PTFE) membranes are an option when there is a need to keep them exposed in the oral cavity. In this study, we report the use of a d-PTFE membrane for bone regeneration in the post-extraction socket in the esthetic zone.


Subject(s)
Humans , Adult , Biocompatible Materials , Bone Regeneration , Bone Transplantation/methods , Polytetrafluoroethylene/therapeutic use , Surgery, Oral/methods , Tomography, X-Ray Computed
14.
Braz. oral res. (Online) ; 31: e96, 2017. tab, graf
Article in English | LILACS | ID: biblio-952130

ABSTRACT

Abstract This study evaluated the effect of implantoplasty on different bone insertion levels of exposed implants. A model of the Bone Level Tapered implant (Straumann Institute, Waldenburg, Switzerland) was created through the Rhinoceros software (version 5.0 SR8, McNeel North America, Seattle, WA, USA). The abutment was fixed to the implant through a retention screw and a monolithic crown was modeled over a cementation line. Six models were created with increasing portions of the implant threads exposed: C1 (1 mm), C2 (2 mm), C3 (3 mm), C4 (4 mm), C5 (5 mm) and C6 (6 mm). The models were made in duplicates and one of each pair was used to simulate implantoplasty, by removing the threads (I1, I2, I3, I4, I5 and I6). The final geometry was exported in STEP format to ANSYS (ANSYS 15.0, ANSYS Inc., Houston, USA) and all materials were considered homogeneous, isotropic and linearly elastic. To assess distribution of stress forces, an axial load (300 N) was applied on the cusp. For the periodontal insert, the strains increased in the peri-implant region according to the size of the exposed portion and independent of the threads' presence. The difference between groups with and without implantoplasty was less than 10%. Critical values were found when the inserted portion was smaller than the exposed portion. In the exposed implants, the stress generated on the implant and retention screw was higher in the models that received implantoplasty. For the bone tissue, exposure of the implant's thread was a damaging factor, independent of implantoplasty. Implantoplasty treatment can be safely used to control peri-implantitis if at least half of the implant is still inserted in bone.


Subject(s)
Humans , Stress, Mechanical , Dental Implants/adverse effects , Osseointegration/physiology , Dental Abutments , Surface Properties , Biomechanical Phenomena , Case-Control Studies , Retreatment , Dental Stress Analysis
15.
ImplantNewsPerio ; 1(8): 1501-1507, nov.-dez. 2016. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-848533

ABSTRACT

Objetivo: o presente estudo avaliou in situ a adesão bacteriana em função da rugosidade superficial das superfícies de titânio. Material e métodos: 24 discos de titânio (titânio grau 4; 4 mm de diâmetro x 3 mm de altura) foram divididos em quatro grupos: A) controle (liso/sem polimento); B) lixa 320; C) lixa 600; e D) lixa 1.200. Após tratamento, os discos foram fixados na região palatina de aparelhos ortodônticos, utilizados por três voluntários durante quatro horas para formação de biofilme. A adesão bacteriana foi avaliada quantitativamente por meio de imagens obtidas em microscopia eletrônica de varredura. Resultado: a rugosidade superficial foi alterada pelos tratamentos com as lixas, variando entre 0,084 µm e 0,324 µm (p < 0,05). A adesão bacteriana foi significativamente maior no grupo B (p=0,0082), apresentando uma área do titânio recoberta com biofilme de 67,68 pixels/µm2, enquanto o grupo A apresentou uma adesão 3,7 x menor. Conclusão: o aumento da rugosidade superficial aumentou significativamente a adesão bacteriana do biofilme dental in situ, após quatro horas. Futuros estudos são necessários para avaliar a maturação e futura colonização bacteriana por outras espécies que sucedem a colonização inicial.


Objective: the present study evaluated, in situ, the bacterial adhesion based on the titanium roughness surface. Material and methods: 24 titanium disks (titanium grade IV, 4 mm diameter and 3 mm high) were divided in 4 groups: A) control (smooth/without treatment); B) 320 grit sandpaper; C) 600 grit sandpaper, and D) 1.200 grit sandpaper. After treatment, all the disks were fixed at palatal area of orthodontic appliances on 3 volunteers during 4 hours after biofilm formation. The bacterial adhesion was quantitatively evaluated during the first hours using scanning electron microscopy images. Results: the superficial roughness was altered by the sandpaper treatment between 0.084 and 0.324 µm (p < 0.05). The bacterial adhesion was statistically higher for the group B (p=0.0082), depicting titanium area cover by biofilm of 67.68 pixels/µm2, while in group A the adhesion was a 3-fold lower. Conclusion: the superficial roughness increases significantly in situ bacterial adhesion four hours later. Further studies are need to evaluate the maturation and future succession bacterial colonization by other species in the succession after the early events.


Subject(s)
Humans , Male , Female , Adult , Bacterial Adhesion , Dental Implants , Microscopy, Electron, Scanning , Evaluation Studies as Topic , Titanium/analysis
16.
ImplantNewsPerio ; 1(6): 1100-1108, ago.-set. 2016. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-847810

ABSTRACT

Os enxertos ósseos homógenos provenientes de bancos de ossos podem ser utilizados para o tratamento de atrofias maxilofaciais em Odontologia. A disponibilidade e a menor morbidade ao paciente, assim como as altas taxas de sucesso observadas em um curto espaço de tempo, foram importantes fatores para a popularização da técnica, entretanto, existem poucos relatos na literatura com acompanhamentos longitudinais. Neste relato clínico, foi avaliada, por um período de 12 anos de carga funcional, uma restauração implantossuportada fixa sobre implantes inseridos em área regenerada com enxerto de banco homógeno, utilizando avaliação clínica e tomográfica. Ainda, é apresentado um breve relato histológico do tecido ósseo removido previamente à inserção dos implantes, sugerindo adaptação do material homógeno junto ao leito receptor. Após 12 anos de acompanhamento clínico, evidenciou-se, mesmo com o sucesso da restauração implantossuportada, a reabsorção total do enxerto homógeno, sugerindo que o mesmo não foi incorporado pelo tecido do hospedeiro. Nas limitações deste relato de caso, sugere-se que áreas enxertadas com osso homógeno devem ser reavaliadas com precaução devido ao grande potencial de reabsorção que podem apresentar, podendo assim comprometer a longevidade da restauração implantossuportada.


The allogeneic bone tissue bank can be used to treat maxillofacial atrophic sites. Its availability and less morbidity, as well as the higher success rates in a short-term period were important to popularize this technique; however, there are few literature reports with long-term results. In this case report, after 12 years of functional loading, a fixed implant-supported restoration was examined over a bone site regenerated with this graft type upon clinical and tomographic analyses. Also, a brief histological report from the removed tissue was presented before dental implant placement, suggesting the close ada ptation of the grafting material to the recipient site. After 12 years of clinical follow-up, even in the case of a successful implant-supported restoration, total graft resorption was demonstrated suggesting deficient incorporation to the recipient host site. Within the limitations of this case, it can be said that grafted areas with allogeneic bone must be evaluated with caution since there is a great chance of resorption, which can compromise the longevity of fixed restorations.


Subject(s)
Humans , Female , Adult , Bone Banks , Bone Resorption , Bone Transplantation , Dental Implants , Tomography, X-Ray Computed , Transplantation, Homologous
17.
ImplantNewsPerio ; 1(6): 1143-1152, ago.-set. 2016. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-847815

ABSTRACT

Reabilitações estéticas em áreas anteriores com limitação de espaço mesiodistal tornam-se um desafio. Entretanto, implantes dentários de diâmetros reduzidos (< 3 mm) têm sido utilizados nestes casos. Este relato de caso apresenta a utilização de dois implantes de diâmetro reduzido (2,8 mm) e conexão morse no tratamento de agenesia de laterais superiores. Após planejamento cirúrgico-protético, os implantes foram restaurados imediatamente e acompanhados por um período de um ano. Dentro das limitações deste trabalho, sugere-se que implantes de diâmetro reduzido podem ser utilizados com sucesso para a restauração imediata de laterais superiores, oferecendo um bom perfil de emergência protética e estética para dentes estreitos.


Esthetic rehabilitations in the anterior zones with limited mesiodistal spaces are a great challenge. However, dental implants with reduced diameters (< 3 mm) with a morse taper connection have been used in cases os lateral incisor agenesis. After a detailed surgical-prosthetic planning, the dental implants were immediately restored and followed-up for one year. Within the limits of this paper, it can be suggested that narrower dental implantes can be used with success in such situations, providing a good emergence profile and esthetics to for narrower dental spaces.


Subject(s)
Humans , Female , Adolescent , Alveolar Process/abnormalities , Anodontia/therapy , Dental Implants , Dental Implants, Single-Tooth , Mouth Rehabilitation , Surgery, Oral/methods
18.
Braz. oral res. (Online) ; 30(1): e40, 2016. tab, graf
Article in English | LILACS | ID: biblio-952021

ABSTRACT

Abstract The fit of the implant-abutment interface was assessed by the metallographic technique and by scanning electron microscopy (SEM), using solid abutment types at different torque levels. Forty Morse taper connections and forty solid abutments were used at different torque levels (repeated after 10 minutes) in the following groups (n = 10): 25 Ncm (group g1), 30 Ncm (group g2), 35 Ncm (group g3), and 40 Ncm (group g4). The samples were embedded in a metallographic resin, sectioned lengthwise, and polished. SEM images were used to measure the linear contacts and the fits between abutments and the internal walls of the implant. The overall mean gap and standard deviation were as follows: 9.0 ± 1.36 µm for group g1, 7.9 ± 2.81 µm for group g2, 2.0 ± 0.76 µm for group g3, and 0.3 ± 0.40 µm for group g4. A significant difference was observed in the average fit values between the groups (p < 0.05). The linear area of contact between the abutment and the implant increased as torque augmented. This study demonstrated that higher insertion torque values in a conical internal connection increase the fit (contact) of the implant-abutment interface.


Subject(s)
Dental Implants/standards , Dental Abutments/standards , Torque , Dental Implantation, Endosseous/methods , Dental Implant-Abutment Design/methods , Reference Standards , Bone Screws , Materials Testing , Microscopy, Electron, Scanning , Analysis of Variance , Weight-Bearing
19.
Perionews ; 9(6): 562-568, nov.-dec. 2015. tab
Article in Portuguese | LILACS | ID: lil-786285

ABSTRACT

A proteína da matriz do esmalte (Emdogain, Straumann, Basel, Switzerland) vem ganhando amplo destaque no tratamento das recessões gengivais, por permitir a regeneração dos tecidos de suporte perdidos. O objetivo desta revisão sistemática foi avaliar compreensivamente a efetividade da proteína da matriz do esmalte no recobrimento radicular. Os artigos inclusos nesta revisão foram encontrados através de uma pesquisa eletrônica na base de dados Medline/Pubmed, e a busca estratégica incluiu a seguinte combinação de palavras para estudos pré-clínicos: “periodontal disease AND gingival ressection OR root coverage AND enamel matrix protein AND animal”; e para os estudos clínicos: “periodontal disease AND gingival ressection OR root coverage AND enamel matrix protein”. Não foram inseridos critérios de refinamento de busca. Inicialmente, 64 artigos foram selecionados para análise. Os estudos pré-clínicos incluídos deveriam ser clínicos, pré-clínicos (em animais) e analisar a efetividade da proteína da matriz do esmalte. Os estudos clínicos deveriam apresentar dados numéricos (média e desvio-padrão) inicias e finais relativos às mensurações de nível clínico de inserção (NCI), de profundidade de sondagem (PS), de mucosa queratinizada (MC), de recessão gengival (RG) e período de observação mínimo de 12 meses. Ao final da análise, 18 artigos – cinco estudos pré-clínicos e 13 estudos clínicos longitudinais – foram inclusos e analisados. As evidências científicas analisadas compreensivamente nesta revisão sistemática sugerem que a utilização da proteína da matriz do esmalte é efetiva, apresentando boa estabilidade e previsibilidade no tratamento de recessões gengivais.


Subject(s)
Dental Enamel , Dental Enamel Proteins , Gingival Recession , Periodontal Diseases
20.
Dent. press implantol ; 9(3): 46-54, July-Sept.2015. ilus
Article in Portuguese | LILACS | ID: lil-796654

ABSTRACT

Paciente do sexo masculino, 54 anos de idade, leucoderma, compareceu a uma clínica privada para tratamento odontológico. Na anamnese, verificou-se tratar de um paciente saudável sistemicamente; os exames clínico e radiográfico demonstraram reabsorção dos terços apical e médio da raiz do dente 21. A opção de tratamento foi a realização da extração do elemento dentário e realização de implante imediato com carga tardia, utilizando-se o dente do próprio paciente como provisório fixado aos dentes vizinhos. O paciente foi informado sobre os detalhes das fases pré-, trans- e pós-cirúrgica, e autorizou a execução do tratamento e da documentação fotográfica com fins de publicação e divulgação. A utilização de periótomo foi necessária para uma exodontia atraumática. Após remoção atraumática da raiz, e com o osso alveolar remanescente preservado, optou-se por realizar a instalação imediata do implante (Neodent, Curitiba/PR, Brasil), com formato cônico e encaixe cone morse. O espaço alvéolo- implante foi preenchido com Bio-Oss®; removeu-se do palato um enxerto conjuntivo subeptelial, rotacionado para vestibular, e fez-se a obliteração do alvéolo — nessa fase, é importante garantir a imobilidade do enxerto, para sua revascularização. Passou-se, então, à fase protética do provisório, utilizando a coroa do elemento extraído como provisório e estabelecendo um pôntico, afixado com resina composta nos elementos 11 e 22. Assim, após a etapa de provisório utilizando o pôntico reembasado com resina composta, começou-se a confecção da coroa protética final. Após acompanhamento de três anos do caso, foi possível concluir que a associação das técnicas obteve resultados estéticos previsíveis e satisfatórios para a prevenção da saúde peri-implantar, conforme planejado...


A male, 54‐year‐old, Caucasian patient attended a private clinic for dental treatment. Hismedical history revealed a systemically healthy patient. Clinical and radiographic examination revealed resorption in the apical and middle thirds of tooth 21 root. A treatment option was to perform extraction of tooth 21 and implant placement with late loading, using patient's own tooth as a provisional secured to adjacent teeth. The patient was made aware of the details before, during and after surgery, and authorized the implementation of treatment and photographic documentation for purposes of publication and dissemination. The use of Periotome was required for atraumatic extraction. After atraumatic removal of the root, andwith the remaining alveolar bone being preserved, we chose to perform immediate implantplacement (Neodent‐Curitiba‐PR, Brazil). The implant was of conical shape and of the MorseTaper type. The alveolar‐implant space was filled with Bio‐Oss®, subepithelial connective graftwas harvested from the palate, with buccal rotation, and alveolar obliteration was carried out. At this stage, it is important to ensure graft immobility for vascularization. Subsequently, the prosthetic phase was carried out with the crown of the extracted tooth used as a temporary tooth, establishing a provisional pontic secured to between teeth 11 and 22 with compositeresin. Accordingly, after the temporary tooth phase with a pontic secured with composite resin, the final prosthetic crown was manufactured. After a three‐year follow‐up, we conclude that the combination of techniques yielded predictable and satisfactory outcomes for themaintenance of peri‐implant health, as planned ...


Subject(s)
Humans , Male , Middle Aged , Biocompatible Materials , Dental Implants, Single-Tooth , Dental Prosthesis Design , Gingiva/transplantation , Tooth Extraction/methods , Immediate Dental Implant Loading , Tooth Mobility/complications , Root Resorption/complications
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