Clinical evaluation of quartz fiber post and zirconia all-ceramic crowns in restoring extensively damaged molar

Objective To evaluate the clinical effect of quartz fiber post and zirconia all-ceramic crowns in restoring extensively damaged molar.Methods A total of 32 molars of 28 patients were included.After complete root canal therapy,the teeth were restored with quartz fiber posts and zirconia all-ceramic crowns.Follow-up survey were conducted 1month,6 months and 12 months later,including the intactness,marginal adaptation,anatomical contour and color of prostheses and gingival health.Results 93.75% of prostheses were found to be intact;little wane was found in two all-ceramic crowns due to hard food biting.Marginal adaptation and anatomical contour was good,color of prostheses in harmony with adjacent teeth(84.37%).No loosening or exfoliation was found among quartz fiber posts and composite resin core.Roentgen diagnosis revealed posts' adaptation to root canal without fracture of posts and cores in any prostheses.Conclusion Quartz fiber posts and zirconia all-ceramic crowns are reliable and ideal materials in the restoration of extensively damaged molar.