Clinical acceptability of metal-ceramic fixed partial dental prosthesis fabricated with direct metal laser sintering technique-5 year follow-up

Prabhu, R; Prabhu, Geetha; Baskaran, Eswaran; Arumugam, Eswaran

doi:10.4103/0972-4052.176526

Cited by 29 publications

(15 citation statements)

References 19 publications

(17 reference statements)

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“…A metal die was milled to resemble the dimensions of reduced mandibular first molar with rounded shoulder finish line (5) . Resin dies were used to simulate tooth structure as they have similar modulus of elasticity to that of dentin (12.9 GPa) (4) The conventional lost wax technique includes multiple manual steps resulting in greater chance for errors (2,18) . While, CAD wax pattern technique aims to reduce inaccuracies by reducing production steps .The spacer thickness of CAD technology cannot be reduced below 50 μm.…”

Section: Discussionmentioning

confidence: 99%

Comparison of the Internal fit of conventional casting versus CAD wax (In-vitro Study)

Mansour

2021

Egyptian Dental Journal

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Statement of Problem: The accuracy of internal fit for subtractive CAD-CAM systems used in the fabrication of metal coping is still unclear. Purpose: This in vitro study compared the internal fit of casting metal core using conventional wax versus CAD wax. Material and Methods: Twenty four resin specimen dies were randomly divided into two groups according to method of metal coping construction using conventional (C) or CAD (D) wax. The silicon replica technique evaluated the internal fit using stereomicroscope at ×24 magnification; the thickness of the silicon layer was measured at 20 reference points on each specimen. Parametric data of internal gap width was analyzed using one-way ANOVA. Results: Different techniques of wax construction showed insignificant difference in internal gap values between specimens made with conventional (C) (103.89±40.39) and CAD (D) waxing (104.10±39.96). However, there was a significant difference between internal gap values measured at different sites. Conclusions: Both construction techniques of casting were considered reliable in production within a clinically acceptable range regarding internal fit.

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Section: Discussionmentioning

confidence: 99%

Comparison of the Internal fit of conventional casting versus CAD wax (In-vitro Study)

Mansour

2021

Egyptian Dental Journal

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“…The mechanism of bonding the veneering porcelain to zirconia is unknown, and it is claimed that this bonding is merely micromechanical, so that the wettability and superficial roughness factors are reported in some studies. 26…”

Section: Discussionmentioning

confidence: 99%

Effect of thermal and mechanical cycles on shear bond strength of zirconia core to porcelain veneer under different surface treatments

Ghaffari

Moslehifard

Motiei

2019

J Dent Res Dent Clin Dent Prospects

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Background. Due to the fragile nature of all-ceramic restorations, it is necessary to provide an appropriate (core) infrastructure to support the veneering porcelain. The veneer detachment and chipping are disadvantages of these restorations. Several techniques have been proposed to minimize these problems. This study evaluated the effect of thermal and mechanical cycles on the shear bond strength of zirconia core to porcelain veneer under different surface treatments. Methods. Sixty disk-like zirconium samples were randomly divided into three groups. The first group was polished and veneered with porcelain, without additional surface treatments. The two other groups were subjected to different surface treatments (modified aluminum oxide by silica and activator‒aluminum oxide and primer) and veneering with porcelain. Half of the samples in each group were subjected to 6000 thermal cycles and 20,000 masticatory cycles of 50 N to imitate the intraoral conditions; the other half were placed in distilled water at 37°C until the shear strength test. Each sample was then buried using PMMA in a mounting jig so that the gap between the core and the veneer could be placed upward. Then, they were exposed to shear stress using a universal testing machine at a rate of 1 mm/min until fracture. The maximum force leading to the fracture was recorded. Results. Comparison of the groups showed that the highest shear bond strength was related to the samples treated with aluminum oxide and primer, without applying thermal and masticatory cycles, which indicated no significant difference from the group treated with aluminum oxide and primer, with thermal and masticatory cycles. The lowest shear bond strengths were related to the polished samples without surface treatment by applying thermal and masticatory cycles (P=0.001), which indicated no significant difference from the untreated group without thermal and masticatory cycles. Conclusion. Based on the results, treatment with aluminum oxide and primer increased the shear bond strength of zirconia core to porcelain veneer. Thermocycling and masticatory cycles failed to reduce the shear bond strength in all the three groups significantly

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“…They found 12 mechanical complications and 1 biological complication on 41 restorations in total. 17 Prabhu et al 18 observed veneered FPDs built by “direct metal laser sintering technique”. They observed 45 patients with posterior restorations and found a CSR of 95.5%.…”

Section: Discussionmentioning

confidence: 99%

Survival rate of modern all-ceramic FPDs during an observation period from 2011 to 2016

2018

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PURPOSEIn literature, many studies compare survival rates of different types of FPDs. Most of them compared restorations, which originated from one university, but from different clinicians. Data about restoration survival rates by only one experienced dentist are very rare. The aim of this study was to evaluate the survival rate of allceramic FPDs without the blurring effects of different clinicians.MATERIALS AND METHODS153 veneeredzirconia FPDs were observed for follow-up. 22 patients received 131 single crowns and 22 bridges. Because of the different bridge lengths, one unit was defined as a restored or replaced tooth. In total, 201 units were included. Only the restorations performed by the same clinician and produced in the same dental laboratory from 2011 to 2016 were included. Considered factors were defined as “type of unit”, “type of abutment”, “intraoral region”, and “vitality”. Modified UHPHS criteria were used for evaluation. Statistical analysis was performed using cox-regression.RESULTS189 units (94.0%) showed no kind of failure. 5 chippings (2.4%) could be corrected by intraoral polishing. 4 units (1.9%) exhibited spontaneous decementation. These polishable and recementable restorations are still in clinical use. Chippings or decementations, which lead to total failure, did not occur. One unit was completely fractured (0.5 %). Biological failures (caries, periodontitis or periimplantitis) did not occur. The statistical analysis of the factors did not reveal any significant differences.CONCLUSIONModern all-ceramic FPDs seem to be an appropriate therapy not only for single restorations but for complex occlusal rehabilitations.

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Clinical acceptability of metal-ceramic fixed partial dental prosthesis fabricated with direct metal laser sintering technique-5 year follow-up

Cited by 29 publications

References 19 publications

Comparison of the Internal fit of conventional casting versus CAD wax (In-vitro Study)

Comparison of the Internal fit of conventional casting versus CAD wax (In-vitro Study)

Effect of thermal and mechanical cycles on shear bond strength of zirconia core to porcelain veneer under different surface treatments

Survival rate of modern all-ceramic FPDs during an observation period from 2011 to 2016

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