Comparison of occlusal contact errors of 6 chairside CAD/CAM crowns: a self-controlled clinical study

Pan, Yang; Lin, Honglei; Wang, Yinghui; Jiang, Lei; Cheng, Yi-ling; Yu, Hao; Cheng, Hui

doi:10.1007/s00784-022-04764-8

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…According to the authors, the difference may be because the 3-axis milling machine used a 1 mm diameter diamond bur to cut the internal surface of the crown, while the 5-axis milling machine uses burs with diameters of 3 mm, 2 mm, and 1 mm in sequence to cut the surface of the crown notch, contributing to the discrepancy in the margin [35]. In addition to these results, a study observed that zirconia restorations exhibited the least occlusal contact fidelity during milling and post-processing, along with the lowest need for occlusal adjustment, advocating for reduced occlusal compensation [36]. Collectively, these studies offer a comprehensive perspective on the impact of various variables on the quality of ceramic restorations produced by CAD-CAM milling machines.…”

Section: Discussionmentioning

confidence: 99%

“…Although the tips used in milling machines are specific to each material type, the hardness of zirconia and the size of the tip can result in restorations with fewer details when compared to lithium disilicate restorations [36]. Similarly, the number of milling machine axes can lead to marginal gaps with statistically significant differences [37,38].…”

Section: Introductionmentioning

confidence: 99%

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Marginal gap of zirconia and lithium disilicate frameworks produced by the CAD-CAM technique through a comparator microscope in vitro analysis

ABREU,

FERREIRA,

OLIVIERI

et al. 2024

Braz. Dent. Sci.

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Objective:The aim of this study was to evaluate the marginal gap of frameworks produced using the CAD-CAM system, from zirconia and lithium disilicate blocks, adapted to a tooth preparation and a gypsum die. Material and Methods: For this study, a human first molar tooth was used as a master model with a full crown preparation. It was molded 20 times to obtain the gypsum die and randomly divided into 2 groups (n=10) for the fabrication of zirconia and lithium disilicate frameworks. The frameworks were made using pre-sintered zirconia blocks and lithium disilicate blocks, both CAD-CAM systems. The marginal gap was measured in µm at four points (buccal, palatal, mesial, and distal) using a comparator microscope with 30x magnification, with the framework seated on the master model (tooth), and on the gypsum die. Marginal gap data (µm) were evaluated using two-way analysis of variance and Tukey's test with a significance level of 5%. Results: The results showed that there was no statistically significant interaction between the factors studied (p=0.223) or isolated factors (ceramic factor p=0.886 and die factor p=0.786). Conclusion: Both ceramics produced using the CAD-CAM technique did not exhibit statistical differences in marginal adaptation on the two types of substrates, both on tooth preparation and on the gypsum die.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marginal gap of zirconia and lithium disilicate frameworks produced by the CAD-CAM technique through a comparator microscope in vitro analysis

ABREU,

FERREIRA,

OLIVIERI

et al. 2024

Braz. Dent. Sci.

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“…The digital workflow allows one to send information about the three-dimensional shape of the prepared tooth and adjacent and antagonist teeth, allowing for further CAD/CAM (computer-aided design/computer-aided manufacturing) processing of the prosthetic restoration [ 10 ]. However, CAD software generates occlusal morphologies based on standardized shapes requiring major occlusal adjustments [ 11 , 12 ]. For this purpose, using an articulator to simulate the movements of a working model is considered an indispensable aspect for prosthetic restorations [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Digital Protocol to Record Occlusal Analysis in Prosthodontics: A Pilot Study

Risciotti,

Squadrito,

Montanari

et al. 2024

JCM

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Background: Digital technologies enable the accurate replication of occlusion, which is pivotal for stability in maximum intercuspation and dynamic occlusion. CAD softwares generates standardized occlusal morphologies requiring significant adjustments. The consideration of individual mandibular movements during restoration leads to better functional integration. This pilot study evaluates the efficacy of a novel, fully digital protocol for occlusal analysis recording in prosthodontics. Methods: Patients needing single or multiple metal-free restorations were included. Teeth underwent horizontal finish line preparation, while restorations on implants were either directly screwed or used multi-unit abutments. A digital impression (Trios 3 Intraoral Scanner) captured the mouth’s elements. Dynamic occlusion was recorded via Patient Specific Motion (PSM). After the placement and functionalization of temporary restorations, subsequent scans included various elements, and CAD software (Dental system) was used for the restoration design. Restorations were milled in monolithic zirconia, pressed from CAD/CAM-milled wax, and sintered. Results: An evaluation of 52 restorations in 37 patients indicated high accuracy in restorations manufactured via the fully digital workflow. Monolithic zirconia was predominantly used. Subtractive (17.3%) and additive (7.7%) occlusal adjustments were mainly chairside. Conclusion: This study underscores the efficacy of meticulous verification measures and a centric contact system in reducing the need for clinical occlusal refinements in prosthetic restorations.

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Digital Comparison of Occlusal Vertical Contacts Between Direct Composite and Indirect Cad/Cam Restorations: An in vivo quantitative assessment

Korkut,

Tüter Bayraktar,

Şenol

et al. 2024

Clinical and Experimental Health Sciences

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Objective: Clinical assessment of the static occlusal vertical contacts for direct composite and indirect Cad/Cam restorations, and evaluation of the clinical experience level's effect on contact registration. Methods: Sixty restorations on maxillary and mandibular molar teeth were investigated. Postgraduate students performed indirect Cad/Cam restorations (Cerasmart, GC Corp., n=20), and both undergraduate and postgraduate students performed direct composite restorations (Ganeial A’chord, GC Corp., n=20 for each). A single supervisor digitally analyzed the occlusal vertical contacts immediately after by using an intraoral scanner (iTero Element-5D, AlignTech) and OrthoCAD software. The tightness of contacts was assessed by counting the pixel numbers in Photoshop CC (Adobe) software. The statistical analyses were performed by Shapiro-Wilk, One-way ANOVA, Tamhane’s T2 test, Kruska-Wallis test, and Dunn tests (p

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Comparison of occlusal contact errors of 6 chairside CAD/CAM crowns: a self-controlled clinical study

Cited by 3 publications

References 30 publications

Marginal gap of zirconia and lithium disilicate frameworks produced by the CAD-CAM technique through a comparator microscope in vitro analysis

Marginal gap of zirconia and lithium disilicate frameworks produced by the CAD-CAM technique through a comparator microscope in vitro analysis

Digital Protocol to Record Occlusal Analysis in Prosthodontics: A Pilot Study

Digital Comparison of Occlusal Vertical Contacts Between Direct Composite and Indirect Cad/Cam Restorations: An in vivo quantitative assessment

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