Screw-retained implant bridge with MUA connection

Fabrics

The next implant parts (IPD Dental Team; Fig. 1) had been used:

• multi-unit abutments, to make sure correct control of insertion and z-axis stresses;
• ProCam scan our bodies, for correct intra-oral scanning; and
• ProCam titanium bases (Ti-bases), to make sure an exact connection between the implants and prosthesis.

Using suitable parts optimised for a virtual workflow ended in a well-fitting and purposeful prosthesis. 

Chairside workflow

Intra-oral scanning
After postoperative therapeutic of the implants, multi-unit abutments and ProCam scan our bodies had been positioned over the implants, and information used to be received with the Medit i700 wi-fi intra-oral scanner (Figs. 2a & b). Using the intra-oral scanner allowed us to keep away from bodily impressions, thereby decreasing affected person discomfort. It additionally allowed for the seize of an in depth and correct virtual illustration of the implant connections and enabled real-time analysis of the scan high quality.

Using intra-oral scanners to seize impressions has demonstrated excessive accuracy when put next with standard ways.^1, 2 The significance of making sure an exact intra-oral scan is steadily under-estimated, and correct intra-oral information seize is the actual start line for a a hit recovery. Correct switch of the implant place is very important for attaining a really perfect fit between the virtual design and scientific truth. Having an optimised geometry and being manufactured from a extremely readable scanning materials, the ProCam scan our bodies allowed the location of the implants and the profile of the peri-implant tissue to be captured with excessive constancy (Fig. 3).

Design
As soon as the STL record of the scan were got, the prosthesis used to be digitally designed within the RealGUIDE CAD+ instrument (3DIEMME), in step with the next standards:

• exact have compatibility at the ProCam Ti-bases;
• passivity of the construction to cut back rigidity;
• occlusion optimisation; and
• herbal aesthetics via complex design.

The implant base used to be then fabricated the usage of Ti-base customized interfaces. A key technical element comes into play right here: the facility to benefit from a distinct 50 μm printing offset, designed to make sure the correct house for the cement and optimise the accuracy of have compatibility between the 3-d-printed phase and the Ti-base. This reputedly minor element grew to become out to be very important for attaining efficient cementation, getting rid of any pressure and making sure very best adhesion of the anatomical phase to the implant base. The facility to change the design in genuine time made the design section extraordinarily environment friendly (Figs. 4a-c). Using CAD/CAM applied sciences in mounted implant prosthetics has proven superb effects in relation to precision and have compatibility.³

Dfab 3-d printing

As soon as the modelling used to be entire, the record used to be despatched to the Dfab 3-d printer (RD-Printing; Fig. 5) for fabrication of the high-strength hybrid polymer prosthesis. The entire printing time used to be 25 mins. The fabric decided on used to be Irix Max Photoshade (DWS Methods; Fig. 6), a ceramic-filled hybrid composite this is biocompatible, sturdy and extremely aesthetic. Direct printing confident:

• excessive accuracy with out the desire for retouching;
• easy floor and outlined main points; and
• herbal color gradient owing to resin layering enabled by means of Photoshade era.

The accuracy of 3-d printing when put next with standard ways is supported by means of scientific research, which have demonstrated excessive reproducibility and prosthetic have compatibility.^4, 5

Dfab employs tilted stereolithography (TSLA) era, designed for chairside manufacture, and works with disposable cartridges, to be had in small, medium and big variations relying at the quantity of materials contained, permitting the workflow to be optimised in step with the quantity and measurement of restorations to be published. An evolution of stereolithography, TSLA is a flexible era that makes use of an vulnerable construct platform and a shifting high-viscosity materials to create a cascade impact that permits heavy fillers to be combined calmly all over printing. This era will increase printing pace and lets in the scale of the supporting constructions to be diminished.

The method starts by means of loading the CAD recovery as an STL record into the Photoshade instrument, which routinely positions and appropriately helps it for the most efficient accuracy and have compatibility with the occlusal floor dealing with the platform and the marginal and inner surfaces freed from fortify and dealing with the cartridge reservoir. The required Photoshade color gradient and positioning of the cervical and incisal color limitations are then decided on, the width of the interspace leading to a pointy (slim) or sluggish (wider) transition (Figs. 7a-c). As soon as the semblance of the recovery is licensed, the printing procedure can start. A disposable Dfab cartridge containing the printing reservoir of the chosen materials and measurement is loaded into the highest of Dfab, at the side of the printing media and disposable platform. The highest of Dfab is closed, and the cartridge is tilted at a forty five° attitude. Printing is initiated by means of the Photoshade Professional instrument, and a continuing go with the flow of materials is begun and maintained by means of gravity and a quiet peristaltic pump (Fig. 8). At this level, the instrument exactly controls the extrusion of materials in two other gradations to supply the required color gradient of the recovery. The blue UV laser beam is directed on the floor of the composite, selectively polymerising it to create the item. The construct platform is step by step reduced into the resin tank, a part of the fabric’s cartridge, and the method is repeated layer by means of layer till the item is entire.

Dfab is then opened, and the highest segment tilted to go back the construct platform and used cartridge to their unique horizontal place, and they’re got rid of, beginning with the platform, to forestall unpolymerised liquid materials from dripping into the printer. To take away any residual unpolymerised liquid composite, the platform containing the recovery is washed with 95% ethanol for 1–2 mins in a distinct shaker container. The recovery is then manually separated from the platform—with out risking harm to adjoining surfaces—by means of greedy the recovery and the usage of a twisting movement to damage the very skinny helps. Any unpolymerised composite residue in spaces such because the occlusal and inner surfaces can also be got rid of with a flat brush dipped in 95% ethanol. In spite of everything, post-polymerisation is carried out to enhance the homes of the restorative materials. A proprietary dual-energy (UV warmth and light) unit (Dcure, RD-Printing) is used (Fig. 9) with an automatic, material-specific cycle that takes roughly 9 mins to finish.

Completing and scientific analysis
After printing, the bridge used to be washed with 94%–96% ethanol (meals grade), post-polymerised and completed at once within the health facility (Figs. 10a-c) with the next procedures:

• sharpening and characterisation with a glaze (DEI revel in Seal Coat Rapid, DEI Italia) to enhance the aesthetics (Figs. 11a-c);
• verification of passive have compatibility at the ProCam Ti-bases;
• extra-oral cementation at the ProCam Ti-bases the usage of MultiLink Hybrid Abutment cement (Ivoclar); and
• verification of occlusion and serve as.

As soon as screwed to the implants, the prosthesis demonstrated superb balance and seamless integration with the peri-implant tissue (Fig. 12). No occlusal retouching used to be carried out.