Microstructure, topography, surface roughness, fractal dimension, internal and marginal adaptation of pressed and milled lithium-disilicate monolithic restorations

Schestatsky, Ricardo; Zucuni, Camila Pauleski; Dapieve, Kiara Serafini; Burgo, Thiago A. L.; Spazzin, Aloísio Oro; Bacchi, Ataís; Valandro, Luiz Felipe; Pereira, Gabriel Kalil Rocha

doi:10.1016/j.jpor.2019.05.004

Cited by 30 publications

(33 citation statements)

References 58 publications

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“…Schestatsky et al 18 . reported that heat‐pressed LDS crowns had better marginal adaptation than milled LDS crowns, but the adaptation of these crowns at the occluso‐axial angles was more accurate with milled technique.…”

Section: Discussionmentioning

confidence: 99%

“…Digital impressions allow less steps than conventional impressions, improving the fit of CAD/CAM restorations 14 . The fit is affected by many factors such as type of preparations, 16,17 method of fabrications, 11,18 technique of gap measurements, 19 and type of materials 4,20 . Poor marginal or internal fit can increase cement dissolution, leading to microleakage, secondary caries, endodontic inflammation, and periodontal disease 21,22 …”

mentioning

confidence: 99%

“…Many studies have compared the fit of heat‐pressed technique versus subtractive technique on partial coverage 11,23,24 and full crowns 12,25–29 ; some results showed that LDS displayed better adaptation under the heat pressing technique for complete crowns 12,25 or partial crowns, 11,23,24 while other trials revealed that LDS crowns presented more precise fitting under milling technique 26–29 . Considering endocrown restorations, some studies evaluated the effect of different materials on the fit, 3,4,20 however others assessed the effect of preparation designs on the adaptation, 16,17 but no study has assessed the effect of fabrication technique on marginal and internal adaptation of LDS endocrowns, while the fitting accuracy is well influenced by many variables such as the fabrication techniques and preparation designs 12,18 …”

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confidence: 99%

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Marginal and Internal Adaptation of Lithium Disilicate Endocrowns Fabricated By Heat‐Pressable and Subtractive Techniques

Ghoul

Salameh

2021

Journal of Prosthodontics

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Purpose To evaluate and to compare the marginal and the internal fit of milled (MLE) and heat‐pressed lithium disilicate endocrowns (PLE). Materials and Methods Thirty mandibular molars were prepared following the circumferential butt margin endocrown preparations; the cervical margin is parallel to the occlusal surface without ferrule design. A digital scan of molars was made using an intraoral digital scanner. The samples were separated into two groups (n = 15 per group); MLE: endocrowns were milled using LDS blocks and a 5‐axis milling machine, PLE: endocrowns were heat‐pressed using lost wax technique and LDS ingots. Marginal and internal adaptation were assessed using a replica technique and a stereomicroscope, selecting 32 measurements on each endocrown. Data were analyzed with one‐way repeated measures ANOVA, two‐way repeated measures ANOVA, student's t‐test and paired student t‐test (α = 0.05). Results Statistically significant interactions were recorded between fabrication technique and region (p < 0.05), F (1.97, 27.69) = 5.462. Group MLE displayed significantly smaller gaps than PLE in all regions (p < 0.001). The largest gap was observed at the pulpal floor in both groups. The internal gap was significantly larger than the marginal gap in MLE group (p < 0.001), while no statistically significant difference was observed in PLE group (p = 0.082). Conclusion Heat‐pressed and milled lithium disilicate endocrowns are clinically suitable, but the milled technique displayed a better fit than heat‐pressed technique when marginal and internal adaptation were examined.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Marginal and Internal Adaptation of Lithium Disilicate Endocrowns Fabricated By Heat‐Pressable and Subtractive Techniques

Ghoul

Salameh

2021

Journal of Prosthodontics

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“…Another option for fabricating dental restorations is the heat-press technique (HPT) 3,7,10,11 , where a tooth is waxed-up, invested in refractory material, and heated in an oven 3,7,12 . The space created by wax elimination is filled with a ceramic ingot that is heat-pressed to obtain the restoration 12,13 .…”

Section: Introductionmentioning

confidence: 99%

“…The space created by wax elimination is filled with a ceramic ingot that is heat-pressed to obtain the restoration 12,13 . The waxing-up procedure can be handmade (conventional method), or computer-aided designed and milled in wax blocks [10][11][12] . Milling restoration directly from ceramic blocks decreases one step compared to milling those in wax blocks, which needs to be invested and heat-pressed.…”

Section: Introductionmentioning

confidence: 99%

Marginal misfit of heat-pressed milled wax-pattern and CAD/CAM crowns and its effect on stress distribution in implant-supported rehabilitations

et al. 2021

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Aim: To compare the marginal fit of lithium disilicate CAD/CAM crowns and heat-pressed crowns fabricated using milled wax patterns, and evaluate its effect on stress distribution in implantsupported rehabilitation. Methods: A CAD model of a mandibular first molar was designed, and 16 lithium disilicate crowns (8/group) were obtained. The crown-prosthetic abutment set was evaluated in a scanning electron microscopy. The mean misfit for each group was recorded and evaluated using Student’s t-test. For in silico analysis, a virtual cement thickness was designed for the two misfit values found previously, and the CAD model was assembled on an implant-abutment set. A load of 100 N was applied at 30° on the central fossa, and the equivalent stress was calculated for the crown, titanium components, bone, and resin cement layer. Results: The CAD/CAM group presented a significantly (p=0.0068) higher misfit (64.99±18.73 μm) than the heat-pressed group (37.64±15.66 μm). In silico results showed that the heat-pressed group presented a decrease in stress concentration of 61% in the crown and 21% in the cement. In addition, a decrease of 14.5% and an increase of 7.8% in the stress for the prosthetic abutment and implant, respectively, was recorded. For the cortical and cancellous bone, a slight increase in stress occurred with an increase in the cement layer thickness of 5.9% and 5.7%, respectively. Conclusion: The milling of wax patterns for subsequent inclusion and obtaining heat-pressed crowns is an option to obtain restorations with an excellent marginal fit and better stress distribution throughout the implant-abutment set.

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The recognition method for the fractal and the dynamic on the tool flank of a high-energy-efficiency milling cutter

Jiang

Zhao

et al. 2023

Int J Adv Manuf Technol

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Microstructure, topography, surface roughness, fractal dimension, internal and marginal adaptation of pressed and milled lithium-disilicate monolithic restorations

Cited by 30 publications

References 58 publications

Marginal and Internal Adaptation of Lithium Disilicate Endocrowns Fabricated By Heat‐Pressable and Subtractive Techniques

Marginal and Internal Adaptation of Lithium Disilicate Endocrowns Fabricated By Heat‐Pressable and Subtractive Techniques

Marginal misfit of heat-pressed milled wax-pattern and CAD/CAM crowns and its effect on stress distribution in implant-supported rehabilitations

The recognition method for the fractal and the dynamic on the tool flank of a high-energy-efficiency milling cutter

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