Effect of crown-root ratio in endo-perio treated teeth restored with prosthodontic crowns

The crown-root ratio (CRR) plays a crucial role in determining the biomechanical stability and long-term prognosis of endo-perio treated teeth restored with prosthodontic crowns. Therefore, it is of interest to assess the influence of CRR on the clinical performance and survival of such teeth in a sample of 60 patients aged 25-65 years. Based on radiographic CRR, teeth were categorized into three groups: favourable (≤1:1), moderate (1:1-1.5:1) and unfavourable (>1.5:1). All patients received standardized endodontic, periodontal and prosthodontic treatment and were evaluated over a 12-month period for probing depth, attachment level, marginal bone changes and crown survival. Teeth with favourable CRR showed minimal bone loss (0.2 mm) and a 100% survival rate, whereas those with unfavourable ratios demonstrated increased bone loss (0.9 mm) and reduced survival (75%) (p < 0.05). Thus, we show that prognosis declines progressively as CRR becomes less favourable, highlighting the importance of radiographic CRR assessment in treatment planning for enhancing the long-term success of prosthodontically restored endo-perio treated teeth.