Comparative in vitro evaluation of CAD/CAM vs conventional provisional crowns

Abdullah, Adil O.; Tsitrou, Effrosyni; Pollington, Sarah

doi:10.1590/1678-775720150451

Cited by 123 publications

(149 citation statements)

References 21 publications

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“…In this study, absolute marginal discrepancy was utilized to assess the adaptation of interim crowns and found a similar result, namely that manually fabricated interim crowns (group BAC) had significantly higher marginal discrepancy than CAD/CAM PMMA resin interim crowns (group CAM). Abdullah et al evaluated the marginal gap and internal fit of CAD/CAM interim crowns and direct interim crowns made of bis‐acryl composite resin material by using the silicone replica technique. They reported that CAD/CAM interim crowns demonstrated superior marginal and internal fit than manually fabricated interim crowns.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, 3DP as an additive manufacturing method is believed to be more efficient in utilizing the material than the subtractive milling method . Recently, several studies suggest that CAD/CAM interim crowns have better marginal integrity than conventional manually fabricated interim crowns . However, there are limited data on the comparison between 3DP interim crowns and other manufacturing methods.…”

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confidence: 99%

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Assessment of the Adaptation of Interim Crowns using Different Measurement Techniques

Peng

Chung

Ramos

2019

Journal of Prosthodontics

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Purpose:To compare the internal fit and marginal discrepancy of acrylic resin interim crowns fabricated by different manufacturing methods, and to test the consistency of measuring marginal discrepancy and internal fit between different measuring techniques. Materials and Methods: A dentoform mandibular left first molar was prepared for an all-ceramic crown. Thirty-six interim crowns were fabricated and divided into three groups (n = 12): group BAC (Bis-acrylic composite, fabricated manually), group CAM (CAD/CAM polymethylmethacrylate resin, milled), and group 3DP (3D printed methacrylic oligomers, printed). The internal fit of the interim crowns was evaluated by the silicone replica technique and by X-ray microcomputed tomography (µCT) technique. The marginal discrepancy of the interim crowns was evaluated by the vinyl polysiloxane (VPS) (Aquasil Ultra XLV) impression technique and by optical coherence tomography (OCT) technique. Data were statistically analyzed using ANOVA and Turkey tests at α = 0.05. Pearson correlation test was used to evaluate the correlation between the different measurement techniques and marginal discrepancy/internal fit. Results: The manually fabricated interim crowns (group BAC) had significantly greater discrepancy of internal fit than did the digitally fabricated crowns (group CAM and group 3DP) measured by both silicone replica technique and µCT 2-dimensional (2D) image measurement. There were no statistically significant differences in the cement space volume values obtained by the µCT image technique between group BAC and group 3DP (p = 0.285). The coefficient of determination between the two volumetric measurement techniques was low (R 2 = 0.30). For marginal discrepancy, the manually fabricated interim crowns had a wider absolute marginal discrepancy than both digitally fabricated groups (p < 0.05). In both the VPS impression and OCT assessment, there was no statistically significant difference between group CAM and group 3DP (p = 0.798 and 0.994, respectively). The coefficient of determination between the VPS impression and OCT techniques for marginal discrepancy measurement was low (R 2 = 0.23). Conclusions: Digitally fabricated interim crowns (group CAM and group 3DP) had better internal fit and smaller marginal discrepancy than manually fabricated interim crowns (group BAC). For comparison of the different evaluation techniques, the silicone replica technique and µCT measurements had low correlation for internal fit assessment, as did the PVS impression and OCT techniques for marginal discrepancy test.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Assessment of the Adaptation of Interim Crowns using Different Measurement Techniques

Peng

Chung

Ramos

2019

Journal of Prosthodontics

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“…From the perspective of the development of computer‐aided technologies, numerous computer‐aided tools become commercially available. Researches have shown CAD/CAM are outperformed conventional design approaches [1,33]. However, these software tools are application‐oriented while most of them are based on the theories in multiple disciplines.…”

Section: Evolution Of Manufacturing Technologies and Computer Aided Tmentioning

confidence: 99%

New CAD/CAM course framework in digital manufacturing

Wang

2018

Comp Applic In Engineering

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Despite the importance of manufacturing industry, its position in a nation's economy has shown its shrinking; the workforce in manufacturing industry has been continuously declined. Engineering universities are highly pressured to attract new‐generation youth to traditional engineering programs and improve their retention ratios by keeping students in engineering programs. There is an emerging need to bring some innovations in engineering curriculum design to keep up with the rapid changes in other fields, especially, information technology (IT). In this paper, we focus on our effort in developing a new computer aided design (CAD) and computer integrated manufacturing CAM) course. Literatures on CAD/CAM course designs are surveyed to identify the limitations in traditional teaching CAD/CAM, the trend of manufacturing technologies is discussed to determine the industry's expectations of their new employees. A new CAD/CAM course has been designed by incorporating the theory of Digital Manufacturing and CAD/CAM integrated tools together in teaching.

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“…If this is not achieved, gingival inflammation can occur . Precise adaptation of the margins and contact points are as important as adequate preparation of the teeth …”

Section: Introductionmentioning

confidence: 99%

“…11,13 Precise adaptation of the margins and contact points are as important as adequate preparation of the teeth. [14][15][16][17][18] Functions of provisional restorations include:…”

Section: Introductionmentioning

confidence: 99%

The utilization of snap‐on provisionals for dental veneers: From an analog to a digital approach

Esquivel

Villarroel²,

Tran

et al. 2020

J Esthet Restor Dent

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Objective There are multiple treatment options to enhance a patient's smile, from conservative bleaching procedures to composite resins, porcelain veneers, or full‐coverage crowns. Treating patients with porcelain veneers is a commonly used approach in esthetic dentistry. Provisional restorations for veneers can be time‐consuming to make and difficult to retain. This article illustrates a technique for fabricating indirect snap‐on provisional restorations for veneer cases, describing both analog and digital approaches. Clinical considerations The present article presents an alternative provisionalization technique using snap‐on restorations for dental veneers. Application of these techniques will allow for ease of cleansability by the patient leading to healthier soft tissues before the final cementation. Delivery of veneers is more predictable with healthy soft tissue, as bleeding and inflammation may affect the bonding process. Conclusions This technique is an effective provisionalization option in most veneer cases. This approach seems to be well accepted by patients and a good alternative in helping to maintain optimal gingival health with interim restorations before delivery. Clinical significance The use of snap‐on provisionals for veneer restorations will allow the clinician to have an efficient technique with better tissue response before cementation. This prevents inflammation and facilitates a controlled delivery process.

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Comparative in vitro evaluation of CAD/CAM vs conventional provisional crowns

Cited by 123 publications

References 21 publications

Assessment of the Adaptation of Interim Crowns using Different Measurement Techniques

Assessment of the Adaptation of Interim Crowns using Different Measurement Techniques

New CAD/CAM course framework in digital manufacturing

The utilization of snap‐on provisionals for dental veneers: From an analog to a digital approach

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