Fit of e.max Crowns Fabricated Using Conventional and CAD/CAM Technology: A Comparative Study

Miwa, Atsushi; Kori, Hidehiro; Tsukiyama, Yoshihiro; Kuwatsuru, Rika; Matsushita, Yasuyuki; Koyano, Kiyoshi

doi:10.11607/ijp.4865

Cited by 20 publications

(19 citation statements)

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“…In the mentioned study, the average difference from the pre‐defined cement gap for bridges fabricated using direct digitalisation was 45 μm at the canine and 40 μm at the premolar; these differences for bridges fabricated using indirect digitalisation were 91 μm at the canine and 67 μm at the premolar . On the other hand, these and our findings are contrary to other studies, which did not find significant difference in the internal fit of all‐ceramic crowns fabricated using direct and indirect digitalisation methods with various pre‐defined cement gaps (50‐150 μm). Despite the variation in the results of previous studies assessing the fit of dental restorations fabricated using direct and indirect techniques, both techniques are considered clinically acceptable …”

Section: Discussioncontrasting

confidence: 99%

“…For the fabrication of the acrylic bridges, a 90 μm pre‐defined cement gap was chosen as suggested by previous studies . The influence of the pre‐defined cement gap (90, 120 and 150 μm) on the fit of monolithic lithium disilicate crowns made from direct and indirect digitalisation techniques was investigated in vitro by Miwa et al . These authors showed that a pre‐defined cement gap of 90 μm resulted in the largest marginal discrepancy, and assumed that this could be attributed to crown elevation due to decreased cement flow.…”

Section: Discussionmentioning

confidence: 99%

“…While the literature suggests the clinically acceptable marginal gap to vary from 50 to 200 μm, 120 μm is often referred to as the maximum clinically tolerable marginal cement gap . The variability in results reported from different studies investigating internal and marginal fit of reconstructions illustrates that the fit is influenced not only by the CAD/CAM system and the milling specifications (eg, pre‐defined cement gap) but also other factors such as the methods used for measuring the fit, as well as the type of restoration . Thus, it is the accumulation of error from each step of the fabrication process and from the measuring method that influence the results.…”

Section: Discussionmentioning

confidence: 99%

“…22 The second null hypothesis was partially rejected, as there was only a significant difference in the internal fit between acrylic bridges fabricated from direct and indirect digitalisation techniques 13,20,23 For the fabrication of the acrylic bridges, a 90 μm pre-defined cement gap was chosen as suggested by previous studies. 5,24 The influence of the pre-defined cement gap (90, 120 and 150 μm) on the fit of monolithic lithium disilicate crowns made from direct and indirect digitalisation techniques was investigated in vitro by Miwa et al 24 These authors showed that a pre-defined cement gap of 90 μm resulted in the largest marginal discrepancy, and assumed that this could be attributed to crown elevation due to decreased cement flow. In the current study, however, the measurements of fit were performed without cement.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of marginal and internal fit of acrylic bridges using optical coherence tomography

Al-Imam

Michou

Benetti

et al. 2018

J of Oral Rehabilitation

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Summary Background The potential of non‐invasive optical coherence tomography (OCT) as a tool for assessment of fit of indirect reconstructions is not fully explored. Objectives The objectives were to investigate the feasibility and validity of OCT, and to measure the internal and marginal fit of acrylic bridges fabricated using direct and indirect digitalisation. Methods The accuracy of the employed swept source OCT (wavelength: 1310 nm) was assessed by comparing with an object with known dimensions. Validity was assessed by measuring an OCT measurements on replica, mimicking the cement film thickness, with stereomicroscopic measurements. The reconstructions were placed on the abutments without cementation. The internal and marginal fit of acrylic bridges from direct and indirect digitalisation techniques were then assessed by obtaining 5 OCT B‐scans per abutment tooth at pre‐defined positions located 250 μm apart. The marginal and internal cement gaps were measured using image‐processing software (ImageJ). Mean and standard deviation were calculated for both groups and t test assuming unequal variances was carried out. The level of significance was defined at 0.05. Results A strong linear correlation (r = 0.865) between OCT and stereomicroscopy was found. T test showed significantly (P < 0.01) better internal fit of bridges made from indirect digitalisation, but no difference in marginal fit. Conclusion OCT is a feasible and valid tool for investigating internal and marginal fit of acrylic dental reconstructions. Better internal fit was observed in bridges fabricated using the direct digitalisation technique. No difference in marginal fit was found between the two fabrication methods.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Evaluation of marginal and internal fit of acrylic bridges using optical coherence tomography

Al-Imam

Michou

Benetti

et al. 2018

J of Oral Rehabilitation

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“…[2223] On the contrary, the latest literature on this subject has reported that the CAD-CAM ceramic restorations having superior fit when compared to the crowns fabricated by heat-press technique. [32425] However, Papadiochou and Pissiotis did not observe any superiority of the of CAD-CAM milling over the casting technique about the marginal adaptation. [26] Inconsistencies in previously reported studies have created a dilemma regarding marginal fit of restoration fabricated by CAD-CAM and conventional techniques.…”

Section: Introductionmentioning

confidence: 99%

Stereomicroscopic evaluation of marginal fit of E.Max press and E.Max computer-aided design and computer-assisted manufacturing lithium disilicate ceramic crowns: An in vitro study

Elrashid

AlKahtani

Alqahtani

et al. 2019

J Int Soc Prevent Communit Dent

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Objective: The purpose of this study was to compare the marginal gap of E-max press, and E.max computer-aided design and computer-assisted manufacturing (CAD-CAM) lithium disilicate (LD) ceramic crowns fabricated by using conventional technique and CAD-CAM technique. Materials and Methods: This was an in vitro experimental study carried out in Riyadh Elm University and King Saud University. A marginal gap of 30 LD crowns was evaluated by Stereomicroscopy. A total of 15 pressable LD (IPS E.max Press [Ivoclar Vivadent]) ceramic crowns were fabricated by using conventional lost wax pattern method (Group A). Digital impressions of the prepared dies were scanned and transferred to the milling machine. IPS E.max CAD (IPS E-max, Ivoclar, Amherst, NY, USA) LD blocks in shade Vita A2 were then milled by using DWX-50 machine for CAD-CAM crowns (Group B). Descriptive statistics of mean and standard error of marginal gaps for both groups were recorded and compared by applying Mann–Whitney U-test. All the data were analyzed by using statistical analysis software SPSS version 21.0 (Armonk, NY, USA: IBM Corp). Results: The LD crowns prepared by CAD-CAM technology (26.80 ± 3.4 μm) had significantly lower ( P < 0.001) marginal gap than the LD pressed crowns (38.8 ± 2.3 μm) fabricated by conventional technique. The marginal gaps between CAD-CAM versus conventional groups exhibited significant differences at (42.68 μm vs. 52.46 μm, U = 51.500, P = 0.011), Mesiobuccal (15.94 μm vs. 30.13 μm, U = 45.500, P = 0.005), distolingual (26.70 μm vs. 43.86 μm, U = 63.500, P = 0.042), and distal (12.38 μm vs 31.45 μm, U = 47.500, P = 0.006). Conclusions: Within the limitations of the study, it can be concluded that LD all ceramic crowns fabricated by using CAD-CAM techniques showed lesser marginal gap and better marginal fit compared to the conventional technique.

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A 3‐year controlled clinical trial comparing high‐translucency zirconia (cubic zirconia) with lithium disilicate glass ceramic (e.max)

Fawakhiri,

Abboud,

Kanout

2023

Clinical & Exp Dental Res

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IntroductionThe rate of clinical success in veneers, under esthetics, has achieved a range of 18 months to 20 years. In a plethora of studies, it registers a success rate reaching 75% and even 100%. The most common type of glass ceramics used in ceramics is the vitreous lithium disilicate crystal‐reinforced material, e.max®. Recent studies focus on “polycrystalline ceramic use” in manufacturing veneers, as it possesses a stronger structure and different enabling manufacturing schemes.ObjectivesThis research aims at comparing e.max and the high‐translucent Cubic Zirconia. Such comparison is administered to veneers manufacturing: esthetic (surface and edge, and staining and color matching), functional (crack and fracture, contact point, and patient satisfaction), and biological (posttreatment vitality and hypersensitivity, and periodontal response).Materials and MethodsThe research sample consisted of 60 veneers, divided into two groups: cubic zirconia and e.max. The sample included 2 males (16.6%) and 10 females (83.3%), with age ranging from 25 to 37 years. Patients were thoroughly diagnosed and treated and included in this study based on certain inclusion–exclusion criteria. Hickel's 2010 criteria were utilized to examine and observe the clinical aspect of veneers during intervals of 1 week, 3 months, 1 year, and 3 years.ResultsNo significant differences were traced across the groups for all the variables, with a p‐value being greater than 0.05. The e.max group revealed better clinical results compared to the cubic zirconia one regarding esthetics and tooth translucency. Nonetheless, the results showed a merely slight increase in hypersensitivity in the e.max group.ConclusionWithin the limitation of an extensive follow‐up period, we can conclude that there is no difference between cubic zirconia and e.max (p > 0.05), where e.max and cubic zirconia veneers have the same characteristics in terms of the following. The characteristics of the aspects examined were esthetic, functional, and biological.

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Fit of e.max Crowns Fabricated Using Conventional and CAD/CAM Technology: A Comparative Study

Cited by 20 publications

References 0 publications

Evaluation of marginal and internal fit of acrylic bridges using optical coherence tomography

Evaluation of marginal and internal fit of acrylic bridges using optical coherence tomography

Stereomicroscopic evaluation of marginal fit of E.Max press and E.Max computer-aided design and computer-assisted manufacturing lithium disilicate ceramic crowns: An in vitro study

A 3‐year controlled clinical trial comparing high‐translucency zirconia (cubic zirconia) with lithium disilicate glass ceramic (e.max)

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