Long-term clinical outcomes for single dental crowns versus extensive direct restorations: A register-based cohort study with up to 10 years of follow-up in a Swedish population

Within the limitations of this retrospective, non-randomized study, teeth restored with large direct restorations appeared to have slightly lower long-term survival and a somewhat higher need for retreatment than teeth restored with crowns. Because treatment selection was based on clinical judgment and tooth condition rather than random allocation, the observed differences likely reflect both treatment choice and case complexity. Future studies using matched cohorts or randomized designs are needed to clarify the causal relationship between restoration type and long-term tooth survival.