Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique

Mously, Hisham Abdullah; Finkelman, Matthew; Zandparsa, Roya; Hirayama, Hiroshi

doi:10.1016/j.prosdent.2014.03.017

Cited by 184 publications

(222 citation statements)

References 40 publications

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“…Two in vitro trials compared the conventional workflow with the polyvinyl siloxane impression and heat-press technique with the digital workflow with optical scans and CAD/CAM for the fabrication of lithium disilicate crowns. 9,12 In 1 study, the conventional impressions were combined with the heat-press technique or with the CAD/CAM fabrication (E4D system). 9 Additionally, the digital Lava C.O.S.…”

Section: Discussionmentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15] A recent systematic review assessed the results of the marginal fit for crowns fabricated with 17 different fabrication processes. 16 The analysis revealed a wide range in the results.…”

Section: Introductionmentioning

confidence: 99%

“…This finding is in accordance with the data of other studies that compared the CAD/CAM restorations and the conventionally fabricated ones. 12,15 One of the main aims of fixed prosthodontics is to achieve restorations with excellent marginal adaptation and high mechanical stability. The fact that the CAD/CAM crowns did not differ from the conventionally fabricated crowns with respect to marginal fit is clinically relevant.…”

mentioning

confidence: 99%

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Randomized controlled within-subject evaluation of digital and conventional workflows for the fabrication of lithium disilicate single crowns. Part III: marginal and internal fit

Zeltner

Sailer

Mühlemann

et al. 2017

The Journal of Prosthetic Dentistry

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STATEMENT OF PROBLEM Trials comparing the overall performance of digital with that of conventional workflows in restorative dentistry are needed. PURPOSE The purpose of the third part of a series of investigations was to test whether the marginal and internal fit of monolithic crowns fabricated with fully digital workflows differed from that of crowns fabricated with the conventional workflow. MATERIAL AND METHODS In each of 10 participants, 5 monolithic lithium disilicate crowns were fabricated for the same abutment tooth according to a randomly generated sequence. Digital workflows were applied for the fabrication of 4 crowns using the Lava, iTero, Cerec inLab, and Cerec infinident systems. The conventional workflow included a polyvinyl siloxane impression, manual waxing, and heat-press technique. The discrepancy between the crown and the tooth was registered using the replica technique with polyvinyl siloxane material. The dimensions of the marginal discrepancy (Discrepancymarginal) and the internal discrepancy in 4 different regions of interest (Discrepancyshoulder, Discrepancyaxial, Discrepancycusp, and Discrepancyocclusal) were assessed using light microscopy. Post hoc Student t test with Bonferroni correction was applied to detect differences (=.05). RESULTS Discrepancymarginal was 83.6 ±51.1 m for the Cerec infinident, 90.4 ±66.1 m for the conventional, 94.3 ±58.3 m for the Lava, 127.8 ±58.3 m for the iTero, and 141.5 ±106.2 m for the Cerec inLab workflow. The differences between the treatment modalities were not statistically significant (P>.05). Discrepancyshoulder was 82.2 ±42.4 m for the Cerec infinident, 97.2 ±63.8 m for the conventional, 103.4 ±52.0 m for the Lava, 133.5 ±73.0 m for the iTero, and 140.0 ±86.6 m for the Cerec inLab workflow. Only the differences between the Cerec infinident and the Cerec inLab were statistically significant (P=.036). The conventionally fabricated crowns revealed significantly lower values in Discrepancycusp and Discrepancyocclusal than all the crowns fabricated with digital workflows (P<.05). CONCLUSIONS In terms of marginal crown fit, no significant differences were found between the conventional and digital workflows for the fabrication of monolithic lithium disilicate crowns. In the occlusal regions, the conventionally manufactured crowns revealed better fit than the digitally fabricated crowns. Chairside milling resulted in less favorable crown fit than centralized milling production. Purpose. The purpose of the fourth part of a series of investigations was to test whether the marginal and internal fit of monolithic crowns fabricated with fully digital workflows differed from that of crowns fabricated with the conventional workflow. Material and methods.In each of 10 participants, 5 monolithic lithium disilicate crowns were fabricated for the same abutment tooth according to a randomly generated sequence.Digital workflows were applied for the fabrication of 4 crowns with Lava, iTero, Cerec inLab, and Cerec infinident systems. The conventional workflow ...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Randomized controlled within-subject evaluation of digital and conventional workflows for the fabrication of lithium disilicate single crowns. Part III: marginal and internal fit

Zeltner

Sailer

Mühlemann

et al. 2017

The Journal of Prosthetic Dentistry

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“…Ceramic crowns can be distorted during this process, which can negatively affect the fit and compromise the success of the restoration. [7][8][9][10] Important considerations are how accurate the milling process is and whether it damages the restoration.…”

Section: Discussionmentioning

confidence: 99%

A 3-dimensional accuracy analysis of chairside CAD/CAM milling processes

Bosch

Ender

Mehl

2014

The Journal of Prosthetic Dentistry

131

102

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“…Greater precision of prostheses in relation to the cervical terminal of the preparation means avoiding exaggerated marginal gaps that may generate dissolution of the cement, thereby increasing the potential of leakage, caries and periodontal disease. Moreover, this may avoid exaggerated space between the surface of the dental preparation and internal part of the crown, thereby avoiding fractures of the prosthetic part 22 . Therefore, clinical success depends on various factors, in addition to correct copying of the cervical terminal, and dentists must be alert to these at all stages during rehabilitation with dental prostheses.…”

Section: Discussionmentioning

confidence: 99%

Comparison between aluminum chloride and tetryzoline hydrochloride for control of vertical gingival displacement and crevicular fluid

Neto

Borges

Souza

et al. 2017

Rev. odontol. UNESP

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ResumoIntrodução: A utilização de fio de afastamento gengival com uma substância de afastamento gengival é um procedimento comum para se realizar uma moldagem com qualidade do término cervical em dentes com finalidade protética. Objetivo: Avaliar se o método mecânico-químico com cloridrato de tetrizolina a 0,05% ou cloreto de alumínio a 25% são capazes de reduzir o fluido crevicular e afastar o tecido gengival verticalmente em uma quantidade maior, estatisticamente significante, em comparação com o método mecânico de afastamento (sem substâncias químicas). Material e método: Dez pacientes foram selecionados, e os fios Ultrapak n° 000 e 1 foram posicionamos de maneira randomizada nos dentes 13, 21 e 23. Grupo I: fio sem substância química; Grupo II: fio impregnado com cloridrato de tetrizolina; Grupo III: fio impregnado com cloreto de alumínio. Utilizando modelos de gesso, foram capturadas trinta imagens com uma câmera acoplada a uma lupa, para análise do grau de afastamento. O fluxo crevicular foi quantificado através de uma balança de alta precisão, a partir de tiras de papel absorvente personalizadas para cada dente que recebeu afastamento gengival. Resultado: Não houve diferença estatística entre os três grupos quanto a quantidade de afastamento gengival vertical (Anova, p=0,26). Quanto a redução de fluido crevicular, não houve diferença entre os grupos teste e controle (Wilcoxon e Friedman, p < 0,05). Conclusão: A utilização do cloridrato de tetrizolina ou cloreto de alumínio em fio de afastamento gengival não melhorou a quantidade de afastamento vertical da gengiva e não reduziu a quantidade de fluido crevicular.Descritores: Retração gengival; líquido do sulco gengival; sulco gengival. AbstractIntroduction: The use of a gingival displacement cord with a gingival displacement substance is a common procedure for taking a quality impression of the cervical terminal in teeth for prosthetic purposes. Objective: To evaluate whether the mechanical-chemical method with 0.05% tetryzoline hydrochloride or 25% aluminum chloride is capable of reducing crevicular fluid, and displacing a statistically significant larger quantity of gingival tissue vertically, compared with the mechanical method (without chemical substances). Material and method: Ten patients were selected, and then No. 000 and 1 Ultrapak cords were randomly positioned on teeth 13, 21 and 23. Group I -cord with no chemical substance; Group II -cords impregnated with tetryzoline hydrochloride and Group III -cords impregnated with aluminum chloride. Using dental stone models, thirty images were captured with a camera coupled to a loupe to analyze the degree of gingival displacement. Crevicular fluid was quantified using a high-precision scale and individualized strips of absorbent paper for each tooth on which gingival displacement was performed. Result: There was no statistical difference between the three groups relative to the amount of vertical gingival displacement (Anova, p=0.26). As regards reduction in crevicular fluid, there was no difference betwe...

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Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique

Cited by 184 publications

References 40 publications

Randomized controlled within-subject evaluation of digital and conventional workflows for the fabrication of lithium disilicate single crowns. Part III: marginal and internal fit

Randomized controlled within-subject evaluation of digital and conventional workflows for the fabrication of lithium disilicate single crowns. Part III: marginal and internal fit

A 3-dimensional accuracy analysis of chairside CAD/CAM milling processes

Comparison between aluminum chloride and tetryzoline hydrochloride for control of vertical gingival displacement and crevicular fluid

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