Amalgum will definitely need an extensive tooth preparation, compared to adhesive restoration. So, a conservative cavity preparation with composite would be a better option. The question does not mention which surfaces are involved .Maybe than, we can re-evaluate the restorative options.
Hello there,
Restoring posterior teeth with resin-based composite materials continues to gain
popularity among clinicians, and the demand for such aesthetic restorations is increasing. Indeed, the most common aesthetic alternative to dental amalgam is resin composite. Moderate to large posterior composite restorations, however, have higher failure rates, more recurrent caries, and increased frequency of replacement. Large to moderate posterior composite restorations continue to have a clinical lifetime that is approximately one-half that of the dental amalgam. While there are numerous recommendations regarding preparation design, restoration placement, and polymerization technique, current research indicates that restoration longevity depends on several variables that may be difficult for us to control. These variables include the patient’s caries risk, tooth position, patient habits, number of restored surfaces, the quality of the tooth restoration bond, and the ability of the restorative material to produce a sealed tooth restoration interface. Although we tend to focus on tooth form when evaluating the success and failure of posterior composite restorations, the emphasis must remain on advancing our understanding of the clinical variables that impact the formation of a durable seal at the restoration–tooth interface.
Hope these facts can help you decide for yourself with regard to your current patient which of the restoration would be more suitable.
Regards
I think remaining tooth structure rather than the materials should determine which one we should have to select, i think in multi-surfaces amalgam can withstand tensile and compressive strength better duo to bulkiness and depth while lack of walls for retention could be managed by means of additional retentions.
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