Off arbor implant adjustment can sometimes be compensated with angled abutments that still acquiesce spiral retention. For these angled abutments to be acclimated the bend advantage charge be added than 17 degrees (Figs 1,2). This is to acquiesce acceptable alteration in the aisle of the abutment spiral to still acquiesce apartment for the absorptive spiral of the restoration. If the alteration of the implant arbor and the application spiral of the abutment to accept the apology is beneath than 17 degrees, there charcoal bereft aggregate of the abutment to abode the application spiral of the apology (Fig. 3). In these situations accepted spiral assimilation of restorations is not possible. Lingual set screws can be congenital in adjustment to absorb restorations on, essentially, abutments advised for adhesive retention, but these are technically arduous to assassinate (Figs 4,5). Alternative methods to displace anchored implant restorations accept additionally been described. One architecture acclimated screws to displace anchored crowns by blame adjoin abutments.2 Abutments for this blazon of apology were advised to accept anchored restorations, screws were congenital into the restorations, and back bare the screws were activated to lift restorations off abutments. Figure 6 illustrates a casting for this blazon of restoration; agenda the accoutrement congenital into the restoration. Figures 7 and 8 allegorize how the spiral works to lift the apology off the abutment back activated; agenda that it pushes adjoin the abutment and can be placed in about any breadth as continued as it has a displacing force. Figures 9 and 10 appearance intra-oral occlusal and facial angle of the restoration, the displacement spiral can be placed in the best ideal position after attention to implant position.
The appropriate abutment has acceptable alteration and can abode a application screw.
The arbor of the implant can be ignored.
Though added methods accept been developed to retrieve anchored restorations, the ideal abutment architecture should still accept the afterward characteristics:
The adhesive allowance should chase the mucosal outline
The actual of the abutment should be able in attenuate section
The actual should be biocompatible.
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