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Cassiano, Luisa Schertel - One of the best experts on this subject based on the ideXlab platform.
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Uso da tomografia computadorizada cone beam para tecidos moles (ST-CBCT) no planejamento de cirurgias estéticas de aumento de coroa clínica
2015Co-Authors: Cassiano, Luisa SchertelAbstract:O objetivo do presente estudo foi propor um protocolo para a aplicação da técnica de tomografia computadorizada cone beam para tecidos moles (ST- CBCT) como um método não-invasivo para avaliar o comprimento da coroa anatômica dos dentes anteriores e planejar cirurgias estéticas de aumento de coroa clínica, evitando a exposição indesejada da porção radicular. Dez pacientes jovens (média de idade de 22,8 anos) com indicação para cirurgias estéticas de aumento de coroa clínica, mas sem indicação de procedimentos restauradores, foram incluídos neste estudo. As imagens de ST-CBCT foram analisados com um software de edição e análise de imagens (Pixelmator 3.2), a coroa clínica, a coroa anatômica e a quantidade de gengiva que recobre o esmalte foram medidos. O valor médio do comprimento das coroas anatômicas dos incisivos centrais, incisivos laterais e caninos foi de 11,06mm, 9,55mm e 9,77mm, respectivamente. Os caninos demonstraram ser aproximadamente 1,3mm mais curtos do que os incisivos centrais. A ST-CBCT provou ser útil para avaliar o comprimento real da coroa anatômica e a quantidade de tecido gengival que precisa de ser removido cirurgicamente. Portanto, a técnica demonstrou ser útil para evitar a exposição indesejada raiz como resultado da cirurgia estética de aumento de coroa clínica, uma vez que permite que seja estimada a quantidade de coroa que está recoberta por tecido gengival. Sendo assim, um procedimento não-invasivo, útil para o planejamento de cirurgias estéticas aumento de coroa clínica. _________________________________________________________________________ ABSTRACTThe aim of the present report is to propose a protocol for the application of soft tissue - cone beam computed tomography (ST-CBCT) as a non-invasive method to assess the length of the anatomical Crown and plan esthetic Crown Lengthening surgeries avoiding undesired root exposure. Ten young patients (mean age of 22.8 years) with indication for esthetic Crown Lengthening surgeries but no indication for restorative procedures were included in this study. The images from the ST-CBCT were analyzed with an image editor and analysis software (Pixelmator 3.2) and the clinical Crown, the anatomical Crown and the amount of gingiva covering the enamel were measured. The mean value of the length of the anatomical Crowns of the central incisors, lateral incisors and canines were 11.06mm, 9.55mm and 9.77mm, respectively. Thus, the canines were approximately 1.3mm shorter than the central incisors. The ST-CBCT technic proved to be useful to assess the actual length of the anatomical Crown and the amount of gingival tissue that needs to be surgically removed, and therefore to prevent undesired root exposure. Thus it is a helpful non-invasive procedure for the planning of esthetic Crown Lengthening surgeries
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Uso da tomografia computadorizada cone beam para tecidos moles (ST-CBCT) no planejamento de cirurgias estéticas de aumento de coroa clínica
'Biblioteca Central da UNB', 2014Co-Authors: Cassiano, Luisa SchertelAbstract:Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ciências da Saúde, Programa de Pós-Graduação em Ciências da Saúde, 2014.O objetivo do presente estudo foi propor um protocolo para a aplicação da técnica de tomografia computadorizada cone beam para tecidos moles (ST- CBCT) como um método não-invasivo para avaliar o comprimento da coroa anatômica dos dentes anteriores e planejar cirurgias estéticas de aumento de coroa clínica, evitando a exposição indesejada da porção radicular. Dez pacientes jovens (média de idade de 22,8 anos) com indicação para cirurgias estéticas de aumento de coroa clínica, mas sem indicação de procedimentos restauradores, foram incluídos neste estudo. As imagens de ST-CBCT foram analisados com um software de edição e análise de imagens (Pixelmator 3.2), a coroa clínica, a coroa anatômica e a quantidade de gengiva que recobre o esmalte foram medidos. O valor médio do comprimento das coroas anatômicas dos incisivos centrais, incisivos laterais e caninos foi de 11,06mm, 9,55mm e 9,77mm, respectivamente. Os caninos demonstraram ser aproximadamente 1,3mm mais curtos do que os incisivos centrais. A ST-CBCT provou ser útil para avaliar o comprimento real da coroa anatômica e a quantidade de tecido gengival que precisa de ser removido cirurgicamente. Portanto, a técnica demonstrou ser útil para evitar a exposição indesejada raiz como resultado da cirurgia estética de aumento de coroa clínica, uma vez que permite que seja estimada a quantidade de coroa que está recoberta por tecido gengival. Sendo assim, um procedimento não-invasivo, útil para o planejamento de cirurgias estéticas aumento de coroa clínica.The aim of the present report is to propose a protocol for the application of soft tissue - cone beam computed tomography (ST-CBCT) as a non-invasive method to assess the length of the anatomical Crown and plan esthetic Crown Lengthening surgeries avoiding undesired root exposure. Ten young patients (mean age of 22.8 years) with indication for esthetic Crown Lengthening surgeries but no indication for restorative procedures were included in this study. The images from the ST-CBCT were analyzed with an image editor and analysis software (Pixelmator 3.2) and the clinical Crown, the anatomical Crown and the amount of gingiva covering the enamel were measured. The mean value of the length of the anatomical Crowns of the central incisors, lateral incisors and canines were 11.06mm, 9.55mm and 9.77mm, respectively. Thus, the canines were approximately 1.3mm shorter than the central incisors. The ST-CBCT technic proved to be useful to assess the actual length of the anatomical Crown and the amount of gingival tissue that needs to be surgically removed, and therefore to prevent undesired root exposure. Thus it is a helpful non-invasive procedure for the planning of esthetic Crown Lengthening surgeries
Min Zhen - One of the best experts on this subject based on the ideXlab platform.
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periodontal evaluation of Crown root fractured teeth following modified Crown Lengthening surgery
British Dental Journal, 2017Co-Authors: Min Zhen, Cui Wang, Hui Zhang, Yiping Wei, Kwokhung ChungAbstract:Objectives To evaluate long-term outcomes of modified Crown Lengthening procedures for Crown-root fractured teeth, and to analyse factors that affect the periodontal health of the treated teeth. Methods The present study retrospectively analysed data from 22 patients (13 males and 9 females) who had presented with Crown-root fractured teeth and received modified Crown Lengthening procedures combined with Crown restoration for ≥13 months. In total, 26 Crown-root fractured teeth were treated and examined for plaque index, probing depth, bleeding index, bleeding on probing, mobility and the Crown margin location. The contralateral tooth and ipsilateral teeth mesial and distal to the treated tooth were used as controls. Data were assessed descriptively or analysed statistically with Mann-Whitney-U test at α=0.05. Results Recorded periodontal indices revealed stable periodontal status in 25 of 26 treated teeth with the mean values for aesthetic and functional VAS scores at 9.5. A negative correlation was observed between the subgingival Crown margin location and the bleeding index. Conclusions The modified Crown Lengthening procedure is a feasible and minimally invasive therapeutic option for management of Crown-root fractured cases.
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finite element analysis of the maxillary central incisor with traditional and modified Crown Lengthening surgery and post core restoration in management of Crown root fracture
Chinese journal of stomatology, 2016Co-Authors: Min Zhen, Wenjie Hu, Qiguo Rong, Hao ZhangAbstract:Objective To construct three-dimensional finite element models with modified Crown Lengthening surgery and post-core restoration in management of various Crown-root fracture types, to investigate the intensity and distribution of stressin models mentioned above, and to compare and analyze the indications of traditional and modified Crown Lengthening surgeries from the mechanic point of view. Methods Nine three-dimensional finite element models with modified Crown Lengthening surgery and post-core restoration were established and analyzed by micro-CT scanning technique, dental impression scanner, Mimics 10.0, Geomagic studio 9.0 and ANSYS 14.0 software. The von Mises stress of dentin, periodontal ligament, alveolar bone, post and core, as well as the periodontal ligament area and threshold limit value were calculated and compared with the findings of traditional Crown Lengthening models which had been published earlierby our research group. Results The von Mises stress intensity of modified Crown Lengthening models were: dentin>post>core>alveolar bone>periodontal ligament. The maximum von Mises stress of dentin(44.37-80.58 MPa)distributed in lingual central shoulder. The periodontal ligament area of the modified Crown Lengthening surgery was reduced by 6% to 28%, under the same Crown-root fracture conditions, the periodontal ligament area of modified Crown Lengthening models was larger than that of the traditional Crown Lengthening models. In modified Crown Lengthening surgery models, the von Mises stress of periodontal ligament of B3L1m, B3L2m, B3L3m models exceeded their limit values, however, the von Mises stress of periodontal ligament of the B2L2c, B2L3c, B3L1c, B3L2c, B3L3c models exceeded their limit values in traditional Crown Lengthening surgery models. Conclusions The modified Crown Lengthening surgery conserves more periodontal supporting tissues, which facilitates the long-term survival of teeth. The indication of modified Crown Lengthening surgery is wider than traditional method. The maxillary central incisors with labial fracture at gingival margin level and with palatal fracture at or below the alveolar crest level are not the indication of the Crown Lengthening surgery. Key words: Tooth fractures; Crown Lengthening; Finite element analysis; Tooth Crown; Tooth root
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finite element analysis of the maxillary central incisor with Crown Lengthening surgery and post core restoration in management of Crown root fracture
Journal of Peking University. Health sciences, 2015Co-Authors: Min Zhen, Wenjie Hu, Qiguo RongAbstract:OBJECTIVE: To construct the finite element models of maxillary central incisor and the simulations with Crown Lengthening surgery and post-core restoration in management of different Crown-root fracture types, to investigate the stress intensity and distributions of these models mentioned above, and to analyze the indications of Crown Lengthening from the point of view of mechanics. METHODS: An extracted maxillary central incisor and alveolar bone plaster model were scanned by Micro-CT and dental impression scanner (3shape D700) respectively. Then the 3D finite element models of the maxillary central incisor and 9 simulations with Crown Lengthening surgery and post-core restoration were constructed by Mimics 10.0, Geomagic studio 9.0 and ANSYS 14.0 software. The oblique static force (100 N) was applied to the palatal surface (the junctional area of the incisal 1/3 and middle 1/3), at 45 degrees to the longitudinal axis, then the von Mises stress of dentin, periodontal ligament, alveolar bone, post and core, as well as the periodontal ligament area, were calculated. RESULTS: A total of 10 high-precision three-dimensional finite element models of maxillary central incisor were established. The von Mises stress of models: post>dentin>alveolar bone>core>periodontal ligament, and the von Mises stress increased linearly with the augmentation of fracture degree (besides the core). The periodontal ligament area of the Crown Lengthening was reduced by 12% to 33%. The von Mises stress of periodontal ligament of the B2L2c, B2L3c, B3L1c, B3L2c, B3L3c models exceeded their threshold limit value, respectively. CONCLUSION: The maxillary central incisors with the labial fracture greater than three-quarter Crown length and the palatal fracture deeper than 1 mm below the alveolar crest are not the ideal indications of the Crown Lengthening surgery.
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a primary observation of the long term effect of modified Crown Lengthening procedure
Chinese journal of stomatology, 2012Co-Authors: Min Zhen, Hao ZhangAbstract:Objective To observe the effect of modified surgical Crown Lengthening procedure and discuss the factors which could affect the periodontal health of the operated teeth. Methods Seventeen patients,a total of 20 teeth,who received the modified Crown Lengthening surgery were recruited in a retrospective study ( 1-6 years). The periodontal status of the operated teeth was compared with the adjacent and the contralateral natural teeth respectively.Results One out of seventeen patients appeared root fracture after surgery,one patient wasn't satisfied with the color of the molar's metal Crown,other fifteen patients were satisfied with the esthetics and function of the teeth.The sites where probing depth was 4 mm just accounted for 4％ (5/120) of the operaled teeth,and the probing depth of the other sites was less than or equal to 3 mm.Although 83％ (33/40) of buccal and lingual sites of the teeth exhibited various degrees of bleeding index,the periodontal indices of the operated teeth and the adjacent teeth.The position of the Crown margin had a significantly negativc correlation with the bleeding indcx( r =-0.742),and the plaque index was moderatelv correlated with the bleeding index(r =0.480).Conclusions The modified surgical Crown Lengthening indicated a good effect,which could be an alternative method to save the residual Crown and root.The position of Crown margin might be the main factor which influences the periodontal health of the teeth. Key words: Crown Lengthening; Treatment outcome; Retrospeetive studies
Mauricio Gallo - One of the best experts on this subject based on the ideXlab platform.
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esthetic rehabilitation through Crown Lengthening surgery and conservative cad cam veneers a multidisciplinary case report
Case Reports in Dentistry, 2016Co-Authors: Leandro Passos, Fernando Peixoto Soares, Mauricio GalloAbstract:This case report describes a successful multidisciplinary approach used to improve the smile esthetics of a patient presenting with excessive gingival display, asymmetric gingival margins, and small upper anterior teeth and lower anterior teeth. The treatment combined esthetic Crown Lengthening, dental bleaching, and restorative dentistry using CAD/CAM veneer. The 6-month follow-up examination confirmed the stability of the modification and absence of adverse effects.
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Esthetic Rehabilitation through Crown Lengthening Surgery and Conservative CAD/CAM Veneers: A Multidisciplinary Case Report
Hindawi Limited, 2016Co-Authors: Leandro Passos, Fernando Peixoto Soares, Mauricio GalloAbstract:This case report describes a successful multidisciplinary approach used to improve the smile esthetics of a patient presenting with excessive gingival display, asymmetric gingival margins, and small upper anterior teeth and lower anterior teeth. The treatment combined esthetic Crown Lengthening, dental bleaching, and restorative dentistry using CAD/CAM veneer. The 6-month follow-up examination confirmed the stability of the modification and absence of adverse effects
Hao Zhang - One of the best experts on this subject based on the ideXlab platform.
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finite element analysis of the maxillary central incisor with traditional and modified Crown Lengthening surgery and post core restoration in management of Crown root fracture
Chinese journal of stomatology, 2016Co-Authors: Min Zhen, Wenjie Hu, Qiguo Rong, Hao ZhangAbstract:Objective To construct three-dimensional finite element models with modified Crown Lengthening surgery and post-core restoration in management of various Crown-root fracture types, to investigate the intensity and distribution of stressin models mentioned above, and to compare and analyze the indications of traditional and modified Crown Lengthening surgeries from the mechanic point of view. Methods Nine three-dimensional finite element models with modified Crown Lengthening surgery and post-core restoration were established and analyzed by micro-CT scanning technique, dental impression scanner, Mimics 10.0, Geomagic studio 9.0 and ANSYS 14.0 software. The von Mises stress of dentin, periodontal ligament, alveolar bone, post and core, as well as the periodontal ligament area and threshold limit value were calculated and compared with the findings of traditional Crown Lengthening models which had been published earlierby our research group. Results The von Mises stress intensity of modified Crown Lengthening models were: dentin>post>core>alveolar bone>periodontal ligament. The maximum von Mises stress of dentin(44.37-80.58 MPa)distributed in lingual central shoulder. The periodontal ligament area of the modified Crown Lengthening surgery was reduced by 6% to 28%, under the same Crown-root fracture conditions, the periodontal ligament area of modified Crown Lengthening models was larger than that of the traditional Crown Lengthening models. In modified Crown Lengthening surgery models, the von Mises stress of periodontal ligament of B3L1m, B3L2m, B3L3m models exceeded their limit values, however, the von Mises stress of periodontal ligament of the B2L2c, B2L3c, B3L1c, B3L2c, B3L3c models exceeded their limit values in traditional Crown Lengthening surgery models. Conclusions The modified Crown Lengthening surgery conserves more periodontal supporting tissues, which facilitates the long-term survival of teeth. The indication of modified Crown Lengthening surgery is wider than traditional method. The maxillary central incisors with labial fracture at gingival margin level and with palatal fracture at or below the alveolar crest level are not the indication of the Crown Lengthening surgery. Key words: Tooth fractures; Crown Lengthening; Finite element analysis; Tooth Crown; Tooth root
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a primary observation of the long term effect of modified Crown Lengthening procedure
Chinese journal of stomatology, 2012Co-Authors: Min Zhen, Hao ZhangAbstract:Objective To observe the effect of modified surgical Crown Lengthening procedure and discuss the factors which could affect the periodontal health of the operated teeth. Methods Seventeen patients,a total of 20 teeth,who received the modified Crown Lengthening surgery were recruited in a retrospective study ( 1-6 years). The periodontal status of the operated teeth was compared with the adjacent and the contralateral natural teeth respectively.Results One out of seventeen patients appeared root fracture after surgery,one patient wasn't satisfied with the color of the molar's metal Crown,other fifteen patients were satisfied with the esthetics and function of the teeth.The sites where probing depth was 4 mm just accounted for 4％ (5/120) of the operaled teeth,and the probing depth of the other sites was less than or equal to 3 mm.Although 83％ (33/40) of buccal and lingual sites of the teeth exhibited various degrees of bleeding index,the periodontal indices of the operated teeth and the adjacent teeth.The position of the Crown margin had a significantly negativc correlation with the bleeding indcx( r =-0.742),and the plaque index was moderatelv correlated with the bleeding index(r =0.480).Conclusions The modified surgical Crown Lengthening indicated a good effect,which could be an alternative method to save the residual Crown and root.The position of Crown margin might be the main factor which influences the periodontal health of the teeth. Key words: Crown Lengthening; Treatment outcome; Retrospeetive studies
Lopes, Carolina Martins Romano - One of the best experts on this subject based on the ideXlab platform.
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Alongamento coronário : uma revisão bibliográfica
2020Co-Authors: Lopes, Carolina Martins RomanoAbstract:Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas MonizO alongamento coronário é um dos procedimentos mais realizados em Periodontologia. Engloba uma grande variedade de técnicas cirúrgicas e não cirúrgicas, com o objetivo de aumentar a exposição da coroa dentária, em doentes com excesso de tecido gengival, ou como técnica adjuvante a procedimentos restauradores. Esta revisão bibliográfica tem como objetivo estudar as várias técnicas de alongamento coronário, suas indicações e contraindicações, bem como rever a importância da avaliação do fenótipo gengival no planeamento terapêutico. Adicionalmente, serão revistos os fatores que influenciam a maturação dos tecidos moles periodontais e a posição final da margem gengival pós-cirúrgica. Foi realizada uma pesquisa bibliográfica utilizando os termos “Crown Lengthening surgery AND gingival biotype”, “Crown Lengthening surgery AND surgical techniques”, “Crown Lengthening surgery AND gingival margin position” e “Crown Lengthening surgery AND surgical complications”, nas bases de dados Pub-Med, Medline, Cochrane e SciELO. Foi dada preferência a meta-análises, revisões sistemáticas e a estudos randomizados controlados. O alongamento coronário cirúrgico está indicado na abordagem de cáries ou fraturas subgengivais, em situações de invasão dos tecidos aderidos supracrestais e ainda em casos com discrepância das margens gengivais. A gengivectomia e a realização de cirurgia de retalho, com ou sem osteotomia, representam as técnicas cirúrgicas mais aplicadas. A extrusão ortodôntica é uma técnica não cirúrgica, normalmente utilizada como alternativa às técnicas cirúrgicas de alongamento coronário. Apesar de serem conhecidos alguns dos fatores implicados na posição final da margem gengival, estão descritas situações de migração apical ou coronal da mesma, com o passar do tempo. O alongamento coronário é uma técnica periodontal valiosa no sentido de recriar um sorriso harmonioso. Com este objetivo, a associação de procedimentos periodontais e protéticos é muitas vezes necessária e benéfica.Crown Lengthening surgery is a commonly performed technique in Periodontology. It involves several surgical and non-surgical techniques, aiming to enhance the exposition of the Crown, in patients with redundant gingival tissue or as an adjuvant technique to restorative procedures. This literature review aims to study the various Crown Lengthening techniques, their indications and contraindications, and review the importance of the gingival phenotype evaluation in the therapeutic plan. A literature review in Pub-Med, Medline, Cochrane e SciELO databases was performed using the terms “Crown Lengthening surgery AND gingival biotype”, “Crown Lengthening surgery AND surgical techniques”, “Crown Lengthening surgery AND gingival margin position” e “Crown Lengthening surgery AND surgical complications”. There was a preference for meta-analysis, systematic reviews and randomized controlled trials. Surgical Crown Lengthening is indicated while treating caries or subgingival fractures, in cases of invasion of the supracrestal gingival tissues or in situations where there are discrepancies in the gingival margin. Gingivectomy and flap surgery with or without osteotomy represent the most used Crown Lengthening surgical techniques. The orthodontic extrusion is the most used Crown Lengthening non-surgical technique, normally applied as an alternative to surgical procedures. Although several factors involved in the final position of the gingival margin are already known, there are still described situations of apical or coronal gingival migration over time. Crown Lengthening is a valuable periodontal technique which can help recreate a harmonious smile. Also, the association between periodontal and prosthetic procedures is many times necessary and beneficial