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cosmetic dentistry_ beauty & science

12 I I special topic _ composite restorations _Abstract This article describes a new bulk-fill resin, or deep resin composite, SonicFill (Kerr Corp., USA), possessing fluctuatingviscositybytheapplicationofsonicenergy. Therationaleforthesystemisexplained,togetherwith concerns and the benefits in clinical practice. Deep resins are primarily indicated for white fillings in pos- terior teeth, but the unique varying viscosity of the SonicFill concept offers other useful clinical applica- tions.Numerouscasestudiesarepresentedforavariety of clinical situations including replacing defective posterior fillings; core build-ups and retaining fixed orthodonticbracketsandretainers. _Introduction The use of amalgam for posterior restorations has declinedconsiderablyinthelasttwodecades,andcon- tinuestodoso.Thereasonsaretwofold,first,scientific advances in the development of superior, alternative restorativematerialsandsecond,patientwishes. Oneofthemajorconcernsaboutamalgamrestora- tions is cavity preparation, which is both invasive and extensive, undermining the remaining tooth substrate alreadyravishedbydisease.Furthermore,placingamal- gam restorations without a dentine-bonding agent fails to seal the margins, and is therefore potentially detrimental. From the patients’ perspective, grey fillings are unsightly, especially in mandibular teeth, and usually shunned in favour of tooth coloured “white” restora- tions. However, the clinical time and cost of these cosmeticdentistry 1_2013 Fig. 1_The SonicFill system consist of a handpiece for delivering sonic energy to a dispensing tip containing a specially formulated resin-based composite. Fig. 2_Pre-operative lower left mandibular molar showing rampant occlusal decay. Fig. 3_A round bur is used for judicial decay excavation, leaving deeper decay in-situ to avoid accidental pulpal exposure. Fig. 4_Completed cavity preparation following decay removal, with 90 degrees cavo-surface angles. Fig. 5_A periodontal probe confirms the cavity depth for ensuring that a single increment of 5 mm of the resin is sufficient to fill the cavity. Deep resins, white fillings: Anew technique for composite restorations Author_ Dr Irfan Ahmad, UK Fig. 1 Fig. 2 Fig. 4Fig. 3 Fig. 5