Pattern of Hydroxyapatite Crystal Growth on Bleached Enamel Following the Application of Two Antioxidants: An Atomic Force Microscope Study.

Objectives: This study observed the topographical pattern of hydroxyapatite deposition and growth (D&G) on bleached enamel following application of two antioxidants (sodium ascorbate and catalase) using atomic force microscope.

Study Design: Twenty enamel specimens (4×3×2mm), prepared from extracted impacted third molars, were mounted in self-cure acrylic and randomly grouped as: Group I-untreated; Group II- 35%HO; Group III- 35%HO + artificial saliva; Group IV- 35%HO + catalase+ artificial saliva; Group V- 35%HO + sodium ascorbate+ artificial saliva. Groups I and II were observed immediately after treatment.

Autogenous tooth fragment reattachment: a multidisciplinary management for complicated crown-root fracture with biologic width violation.

Fractures of multiple permanent anterior teeth can be a traumatic experience for children, with functional, esthetic and psychological aspects. The treatment of complicated crown-root fractures (CRFs) is more challenging when the biologic width is violated. This paper presents a case of 12-year boy with complicated CRF of teeth #12 and #21, and horizontal crown fracture of tooth #11.