The laboratory can get very ‘arty’- adding stains and tints to make the tooth as life-like as possible. Those milled out of a solid block of porcelain of a particular shade can have less of a natural appearance and are more difficult to match to neighbouring teeth- which may have a variety of shades. The type of porcelain used affects the colour and in areas where a really good match is needed, it is much better to have a restoration built up by hand and fired in the furnace. Expansion. They don’t expand and contract in the same way as filling materials reducing the stresses on the tooth.Hygiene. Because they are custom- made for individual teeth, they do not trap plaque in the same way that poorly done fillings can and thus are easier to keep clean.Durable. They are more durable and last longer than fillings.Decay.They are less prone to decay at the margins because of the custom fit and the good seal they achieve.Wear. The materials used to make the inlays/ onlays are extremely durable and will wear like fillings, even under the stress of grinding.Strength. They are not as destructive to the remaining tooth as crowns and by preserving much of the natural tooth, they increase the strength of the tooth.The porcelain can not only be shaped to mimic the original tooth, but the patterns of the biting-surface are naturally recreated- with a little staining for added effect. Appearance. They have a very attractive natural appearance, unlike silver amalgam and are much less prone to picking up stain and discolouring than white filling materials.
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