Impact of minimal taper canal preparation on the adaptation of glass fiber posts.

Objectives: To evaluate the adaptation of a small diameter glass fiber post in minimally prepared root canals and to compare two taper configurations (4% and 7%) within the framework of minimally invasive endodontics (MIE). Materials and Methods: Twenty standardized resin canal models with identical internal anatomy were assigned to two groups ( Results: Low mean RMS values confirmed excellent digital alignment accuracy across both groups (7% group: 0.0615 ± 0.029 mm and 4% group: 0.1496 ± 0.088 mm). At all five evaluated cross-sectional levels (-5, -6, -7, -8, and -9 mm), the canal-derived diameters were significantly smaller than the 0.95 mm reference post ( Conclusions: Minimally invasive canal preparations utilizing 4% and 7% tapers effectively preserve radicular dentin structural integrity but do not provide sufficient physical space to accommodate standard small diameter (0.95 mm) glass fiber posts. To successfully bridge this gap without sacrificing the biological benefits of conservative endodontics, a balanced approach combining apical preservation with highly controlled coronal modification is required. Alternatively, the dental industry must develop reduced-taper, smaller-diameter fiber posts that match contemporary minimal-preparation file dimensions.