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Problem & Impact: Fractured implant screws, while uncommon, pose a significant mechanical complication. They often follow screw loosening or biomechanical overload, sometimes leading to complex retrieval or even implant removal. Main Causes: Fatigue fracture from repeated micro-movements, inadequate preload or torque, prosthetic misfit, excessive occlusal loading, parafunctional habits, and suboptimal screw design or materials are leading contributors. Materials/Fractography:

ZIRCONIA — Strength & Durability First Pros: • High flexural strength → ideal for posterior load, bruxers, thin restorations. • Excellent fracture resistance. • Minimal reduction needed. Cons: • Very high radiopacity → can mask small recurrent caries, complicate marginal evaluation. • Causes CBCT scatter/beam-hardening → reduced diagnostic accuracy around margins. • Less lifelike translucency than glass-ceramics. E.MAX (LITHIUM DISILICATE) — Esthetics & Adhesion Pros: • Super

As digital workflows evolve, the debate between sleeveless and metal sleeve surgical guides continues, and the findings aren't as clear-cut as you might think. Recent Evidence Supporting Sleeveless: 2025 in vitro study (Clinical Implant Dentistry and Related Research): Sleeveless guides delivered superior accuracy, milled sleeveless had best linear accuracy, 3D printed sleeveless had best angular accuracy 2024 study (Medicina): Sleeveless 3D-printed guides showed comparable o