Fit of single tooth zirconia copings: comparison between various manufacturing processes

Grenade, Charlotte; Mainjot, Amélie; Vanheusden, Alain

doi:10.1016/s0022-3913(11)60040-1

Cited by 94 publications

(75 citation statements)

References 33 publications

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“…For the manual adapted copings, the mean marginal gaps varied from 54 to 59.9 μm. This is in accordance with marginal gaps reported for CAD/ CAM-generated zirconia copings in other studies, in which marginal gaps ranged from 24 to 110 μm 6,11,14,15,31) . The large variation in the reported mean values can be explained by a number of infl uencing factors, including CAD/CAM components and differences between presintered and post-sintered milling of the zirconia blank.…”

Section: Discussionsupporting

confidence: 92%

“…Clinically, the fi t of all-ceramic restorations is infl uenced by factors that simulate oral conditions, such as the veneering technique, cementation methodology, and aging process, which have not been evaluated in the present study 33) . Furthermore, the preparations of the artifi cial abutments were idealized and thus do not refl ect the conditions of daily clinical practice 14) . A disadvantage of the measurement of marginal gaps with a light microscope is the two-dimensional display format, which only allows for the detection of vertical discrepancies.…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that allceramic crowns show a mean marginal discrepancy that ranges from 19-160 μm [7][8][9][10] . The mean marginal gap for CAD/CAM-generated crowns is reported to be 23-110 μm 6,[11][12][13][14][15] . Many authors accept the criterion established by McLean and von Fraunhofer (1971) who proposed after a 5-year examination of 1,000 restorations that 120 μm should be considered the maximum marginal gap 6,[15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

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Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

et al. 2012

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This study evaluated the effect of different parameters on the marginal precision of CAD/CAM-fabricated zirconia copings. Specimens (n=60) were fabricated with two different scanners and two milling systems. The copings were evaluated with respect to their mean and average maximum marginal gaps. A two-way analysis of variance (ANOVA) (α=0.05) was used to evaluate the effect of different parameters (scanner, milling process) on marginal accuracy. The mean (averaged maximum) marginal gaps ranged from 57.9 (112.2 μm) to 71.0 (144.6 μm) in the "as machined" state. After manual adaptation, the respective values ranged from 54.6 (98.0 μm) to 59.9 (107.7 μm). The system and manual adaptation variables were found both to have multiple signifi cant effects on the marginal gap size and to have a complex interaction. Thus, synchronized/validated processing chains should be preferentially used to guarantee optimal fi tting accuracy for CAD/CAM zirconia restorations.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

et al. 2012

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“…Во многих исследованиях продемонстрировано, что нарушение краевого прилега-ния реставраций, изготовленных методом CAD/CAM, ас-социировано с различными факторами, например, таки-ми как вид границы препарирования, толщина слоя лака на гипсовой модели, тип материала для цементирования [10][11][12][13]. Более того, существуют разные мнения по пово-ду используемого программного обеспечения, точности фрезерования и их влияния на посадку CAD/CAM-реставрации [14][15][16][17][18][19].…”

Section: стоматология 5 2016unclassified

Comparative analysis of 3D data visibility of the prepared tooth finishing line on a synthetic jaw model, captured by international scanners in a laboratory conditions

Ryakhovskiy

Kostyukova

2016

Stomat.

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“…During the past few decades various impression and die materials have been used in dentistry, [1][2][3] and marginal and internal fit has been determined using a variety of measuring techniques: cementing on extracted teeth or replicas and subsequent slicing of the restorations and the teeth/replicas, [4][5][6] direct measurement with light microscope, 7,8 or replica technique with polyvinylsiloxane impression materials. [9][10] Currently, most impression materials have to be sent by mail and/or courier to dental laboratories despite the possible risk of the impressions being disease carriers as disinfection of impression materials is problematic.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Ceramic Restorations Made Using an In-office Optical Scanning Technique: An In Vitro Study

Tidehag

Ottosson

Sjögren

2014

Operative Dentistry

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The findings in the present study suggest that in-office digital impressions and subsequent computer-aided design/computer-aided manufacturing (CAD/CAM) fabrication of ceramic crowns could result in marginal and internal fit similar to that of hot-pressed all-ceramic crowns. SUMMARYThe present in vitro study concerns determination of the pre-cementation gap width of all-ceramic crowns made using an in-office digital-impression technique and subsequent computer-aided design/computer-aided manufacturing (CAD/CAM) production. Two chairside video camera systems were used: the Lava Oral scanner and Cadent's iTero scanner. Digital scans were made of a first molar typodont tooth that was suitably prepared for an all-ceramic crown. The digital impressions were sent via the Internet to commercial dental laboratories, where the crowns were made. Also, an impression of the typodont tooth was made, poured, and scanned in order to evaluate the pre-cementation gap of crowns produced from scanning stone dies. These methods and systems were evaluated by creating replicas of the intermediate space using an addition-cured silicone, and the gap widths were determined using a measuring microscope. Hot-pressed leucite-reinforced glassceramic crowns were selected as a reference. The mean value for the marginal measuring points of the control was 170 lm, and the values for all the evaluated crowns ranged from 107 to 128 lm. Corresponding figures for the internal measuring points were 141-210 lm and 115-237 lm, respectively. Based on the findings in the present study, an in-office digital-impression technique can be used to fabricate CAD/CAM ceramic single crowns with a marginal and internal accuracy that is on the same level as that of a conventional hot-pressed glass-ceramic crown. In the pre-

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Fit of single tooth zirconia copings: comparison between various manufacturing processes

Cited by 94 publications

References 33 publications

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

Comparative analysis of 3D data visibility of the prepared tooth finishing line on a synthetic jaw model, captured by international scanners in a laboratory conditions

Accuracy of Ceramic Restorations Made Using an In-office Optical Scanning Technique: An In Vitro Study

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