Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] · 2026
Enhancement of Bond Strength, Degree of Conversion and Biocompatibility In Vitro Using a Hollow Glass Fiber Post With an Optical Illuminator in the Restoration of Endodontically Treated Teeth.
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Gomes Laís Carolina Landim, Nakano Leonardo Jiro Nomura, de Siqueira Lilian, Dos Santos Lupp Juliana, de Vasconcellos Luana Marotta Reis, de Arruda Paes Junior Tarcisio José
Аннотация
OBJECTIVE: Evaluate an optical fiber illuminator associated with a hollow glass post on resin cement's adhesive, physicochemical, and biological properties.
MATERIALS AND METHODS: To enhance light transmission throughout the root canal, a photopolymerization optical fiber device was developed. Eighty bovine teeth were distributed into five groups (n = 16): CD (Commercial post, Allcem dual-cured cement); PL (Hollow post, Allcem light-cured cement); PD (Hollow post, Allcem dual-cured cement); POL (Optical illuminator, hollow post, Allcem light-cured cement); POD (Optical illuminator, hollow post, Allcem dual-cured cement). About 2 mm slices (n = 12) from cervical, middle, and apical thirds underwent a push-out bond test, fracture analysis, conversion of monomer degree (DC%), energy dispersive spectroscopy (EDS), and MTT cytotoxicity. Micro-CT (n = 4) evaluated the cementation interface.
RESULTS: Apical third exhibited higher adhesive strength compared to the middle third (p < 0.001). Fiber optic lighting with a hollow glass fiber post and dual-cured cement (POD) from apical showed the highest bond strength and DC%. EDS proved suitable chemical components. Hollow glass fiber post and dual-cured cement (PD) from apical exhibited higher cell viability compared to commercial post (p < 0.001). Micro-CT with 3D reconstruction evidenced the excellent adaptation of the post.
CONCLUSION: The illuminator device efficiently improved cement's adhesive strength, degree of conversion for the dual-cured cement, especially in the apical third, and enhanced the biocompatibility of the proposed system.
CLINICAL RELEVANCE: This novel optical device enhances light transmission within the root canal, improving post bonding and potentially leading to better clinical outcomes in the restoration of endodontically treated teeth.
MATERIALS AND METHODS: To enhance light transmission throughout the root canal, a photopolymerization optical fiber device was developed. Eighty bovine teeth were distributed into five groups (n = 16): CD (Commercial post, Allcem dual-cured cement); PL (Hollow post, Allcem light-cured cement); PD (Hollow post, Allcem dual-cured cement); POL (Optical illuminator, hollow post, Allcem light-cured cement); POD (Optical illuminator, hollow post, Allcem dual-cured cement). About 2 mm slices (n = 12) from cervical, middle, and apical thirds underwent a push-out bond test, fracture analysis, conversion of monomer degree (DC%), energy dispersive spectroscopy (EDS), and MTT cytotoxicity. Micro-CT (n = 4) evaluated the cementation interface.
RESULTS: Apical third exhibited higher adhesive strength compared to the middle third (p < 0.001). Fiber optic lighting with a hollow glass fiber post and dual-cured cement (POD) from apical showed the highest bond strength and DC%. EDS proved suitable chemical components. Hollow glass fiber post and dual-cured cement (PD) from apical exhibited higher cell viability compared to commercial post (p < 0.001). Micro-CT with 3D reconstruction evidenced the excellent adaptation of the post.
CONCLUSION: The illuminator device efficiently improved cement's adhesive strength, degree of conversion for the dual-cured cement, especially in the apical third, and enhanced the biocompatibility of the proposed system.
CLINICAL RELEVANCE: This novel optical device enhances light transmission within the root canal, improving post bonding and potentially leading to better clinical outcomes in the restoration of endodontically treated teeth.