Influence of CAD/CAM tool and material on tool wear and roughness of dental prostheses after milling

Lebon, Nicolas; Tapie, Laurent; Vennat, Elsa; Mawussi, Bernardin

doi:10.1016/j.prosdent.2014.12.021

Cited by 101 publications

(81 citation statements)

References 24 publications

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“…The developments of CAD/ CAM technology combined with the new ceramic materials specifically designed for this technology are attracting the curiosity of many researchers. 5,9,10,[29][30][31] The principles of chair-side CAD/CAM are becoming increasingly accepted among clinicians and universities, changing the common way of learning indirect restorations and providing access to their application by more professionals in their practices. 10,32,33,34 A new skill is becoming of major importance for future dentists, improving their competence and ability to do digital restorations.…”

Section: Discussionmentioning

confidence: 99%

Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

et al. 2019

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The aim of this study is to evaluate the machinability of four CAD/CAM materials (n = 13) assessed by brittleness index, Vickers hardness, and fracture toughness and interaction among such mechanical properties. The materials selected in this in vitro study are Feldspathic ceramic [FC], Lithium-disilicate glass ceramic [LD], leucite-reinforced glass ceramic [LR], and nanofilled resin material [RN]. Slices were made from the blocks following original dimensions 14 x 12 x 3 mm (L x W x H), using a precision slow-speed saw device and then surfaces were regularized through a polishing device. Brittleness index and fracture toughness were calculated by the use of specific equations for each one of the properties. The Vickers hardness was calculated automated software in the microhardness device. One-way Anova and Pearson's correlation were applied to data evaluation. LD obtained the highest values for brittleness index and was not significantly different from FC. LR presented statistically significant difference compared with RN, which had the lowest mean. Vickers hardness showed LD with the highest average, and no statistical difference was found between FC and LR. RN presented the lowest average. Fracture toughness showed FC and LR not statistically different from each other, likewise LD and RN. The brittleness index, considered also as the machinability of a material, showed within this study as positively dependent on Vickers hardness, which leads to conclusion that hardness of ceramics is related to its milling capacity. In addition, fracture toughness of pre-sintered ceramics is compared to polymer-based materials.

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Section: Discussionmentioning

confidence: 99%

Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

et al. 2019

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“…The main difference of the proposed approach with conventional indirect methods is related to the absence of new VDO testing phase and provisional restorations use (One step), definitive indirect restorations being all bonded within two consecutive days, which reduces visit number, chairtime, cost and treatment complexity. The procedure is also characterized by the material approach, with the use of PICN materials (hybrid ceramics), which exhibit several advantages compared to ceramics and other composite materials, such as (1) the ability to be milled to a very low thickness with less edge chipping than ceramics which allowed for a “No prep” approach and a restoration design corresponding to the estimated tissue loss; (2) the ease of in‐mouth adjustments: the management of occlusal relationships required meticulous adjustments and from that point of view, PICNs were shown to be more adapted than ceramics; (3) the biomechanical properties, ceramics being brittle and stiff, while direct light‐cured composites exhibit a reduced strength and a too low elasticity modulus compared to tooth tissues; (4) the high degree of conversion of monomers, which improves chemical stability and reduces free monomer release compared to light‐cured composites; (5) the bonding properties, which were shown to be as good as glass‐ceramics when the material is etched . The use of CAD‐CAM indirect restorations facilitates tooth anatomy and occlusion management with a reduced chairtime compared to direct composites.…”

Section: Discussionmentioning

confidence: 99%

The One step‐No prep technique: A straightforward and minimally invasive approach for full‐mouth rehabilitation of worn dentition using polymer‐infiltrated ceramic network (PICN) CAD‐CAM prostheses

Mainjot¹

2018

J Esthet Restor Dent

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Objectives To introduce a novel approach for full‐mouth rehabilitation of severely worn dentition using polymer‐infiltrated ceramic network (PICN) computer‐aided‐design and manufacturing (CAD‐CAM) restorations, without tooth tissue preparation and provisional phase. Clinical considerations Three patients with generalized tooth wear, suffering from dental pain, masticatory dysfunction, bruxism and neck and back pain, were selected and treated in collaboration with physiotherapists. Occlusal analyses were performed and full‐mouth diagnostic wax‐ups were designed on the basis of estimated tissue loss. Deficient direct restorations were replaced and low‐thickness PICN (Vita Enamic) restorations (up to 0.2 mm) were CAD‐CAM designed from wax‐ups, milled, tried‐in and then bonded within two consecutive days. To mask palatal veneers, either buccal direct composites or glass‐ceramic veneers were later performed. An occlusal splint was realized. Clinical results were shown to be successful after a follow‐up of 22, 18, and 13 months, respectively. The absence of provisional phase did not engender any inconveniences. Patient reported outcomes were very positive, showing a reduction in neck and back pain and a well‐being increase. Conclusion The proposed protocol is particularly minimally invasive and straightforward compared to classical techniques. PICNs exhibit several advantages compared to other materials. Preliminary results of this multidisciplinary approach are promising but deserve further clinical research. Clinical significance The development of CAD‐CAM technologies offers the possibility of improving treatment of severe worn dentition, reducing chairtime and need of tooth tissue preparation, and introducing a new class of composite materials (hybrid ceramics), which exhibit interesting properties for this indication. The influence of the proposed multidisciplinary approach, particularly the collaboration with physiotherapists, needs to be further explored with respect to treatment of associated symptoms, such as masticatory muscles hypertrophy and neck pain.

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“…Behr et al49 mentioned that the required tooth and resin bond strength is at least 10 MPa; all samples tested here showed a lower bond strength. Lebon et al50 investigated the roughness of dental materials, including RNC, after milling. Three commonly used milling tools with average diamond grit sizes of 105, 78, and 43.5 µm were used.…”

Section: Discussionmentioning

confidence: 99%

Microtensile bond strength and micromorphologic analysis of surface-treated resin nanoceramics

Park

Choi

2016

J Adv Prosthodont

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PURPOSEThe aim of this study was to evaluate the influence of different surface treatment methods on the microtensile bond strength of resin cement to resin nanoceramic (RNC).MATERIALS AND METHODSRNC onlays (Lava Ultimate) (n=30) were treated using air abrasion with and without a universal adhesive, or HF etching followed by a universal adhesive with and without a silane coupling agent, or tribological silica coating with and without a universal adhesive, and divided into 6 groups. Onlays were luted with resin cement to dentin surfaces. A microtensile bond strength test was performed and evaluated by one-way ANOVA and Tukey HSD test (α=.05). A nanoscratch test, field emission scanning electron microscopy, and energy dispersive X-ray spectroscopy were used for micromorphologic analysis (α=.05). The roughness and elemental proportion were evaluated by Kruskal–Wallis test and Mann–Whitney U test.RESULTSTribological silica coating showed the highest roughness, followed by air abrasion and HF etching. After HF etching, the RNC surface presented a decrease in oxygen, silicon, and zirconium ratio with increasing carbon ratio. Air abrasion with universal adhesive showed the highest bond strength followed by tribological silica coating with universal adhesive. HF etching with universal adhesive showed the lowest bond strength.CONCLUSIONAn improved understanding of the effect of surface treatment of RNC could enhance the durability of resin bonding when used for indirect restorations. When using RNC for restoration, effective and systemic surface roughening methods and an appropriate adhesive are required.

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Influence of CAD/CAM tool and material on tool wear and roughness of dental prostheses after milling

Cited by 101 publications

References 24 publications

Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

Brittleness index and its relationship with materials mechanical properties: Influence on the machinability of CAD/CAM materials

The One step‐No prep technique: A straightforward and minimally invasive approach for full‐mouth rehabilitation of worn dentition using polymer‐infiltrated ceramic network (PICN) CAD‐CAM prostheses

Microtensile bond strength and micromorphologic analysis of surface-treated resin nanoceramics

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