The marginal ridges can be used as a key to achieve relative vertical positioning of the posterior teeth 4.During the finishing stage, it is important to make sure that the marginal ridges of adjacent posterior teeth are positioned at the same level (Fig. 1). This will position the cusps and fossae of those teeth at the same level.Once the marginal ridges of the posterior teeth are positioned at the same relative level, then the cementoenamel junctions are also at the same relative level. This will lead to the bone levels between the adjacent teeth being flat, producing a much healthier periodontal situation for the patient.
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