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Advisory Committee Chair

Chung How Kau

Advisory Committee Members

Jack Lemons

Amjad Javed

Nada Souccar

Clark Browne

Document Type

Thesis

Date of Award

2015

Degree Name by School

Master of Dentistry (MDent) School of Dentistry

Abstract

ABSTRACT The purpose of this study was to analyze the microstrains of compact and trabecular bone caused by loading of different miniscrews at different healing times, and to compare these results to the limits of bone stability maintenance based on the Frost Mechanostat Theory. Materials and Methods: Theoretical calculations of microstrains of bone surrounding 10 different miniscrews were done. These miniscrews were considered under loading forces of 500 gm., and the microstains of both trabecular and compact bone were calculated separately when the thickness of the compact bone was at 1mm or 2mm. The microstrains were calculated at 4 different healing times after the insertion of miniscrews at (T0), after 1 week (T1), 6 weeks (T6), more than 6 weeks (T>6), and 54 weeks (T54). Results: Miniscrews with smaller surface areas showed risk for bone microfracture at weeks T1 and T6 under loading forces of 500 mg. The general pattern of microstrain at different healing times demonstrated a gradual increase until a maximum at weeks T6 and T>6, then a gradual decrease till the end of healing process. Conclusions: Cortical bone thickness was the primary factor in determining the primary stability. Evaluation of healing times and the associated modulus of elasticity of both trabecular and cortical bone showed that the loading forces should be adjusted according to different healing time.

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