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Abstract
Fifteen patients were selected.
They had only mandibular canines opposing completely edentulous maxillae.
All canines were endodontically treatment.
Patients were divided into three groups according to the planned treatment pattern.
Group I:
The mandibular canines were reduced to medium short dome shaped preparation ”3mm” above the gingiva. The abutments received cast coping with short post extending 4-5 mm into the root canal.
Group II:
The mandibular canines were reduced to short dome shaped preparation ”1mm” above the gingiva and they received cast coping with short post extending 4-5mm into the root canal.
Group III:
The crowns of the canines were amputated and reduced 2mm below alveolar bone level after reflection of surgical flap.
The abutments were evaluated clinically through measurement of the gingival crevicular fluid (G.C.F) and pocket depth for group I & II.
Radiographic evaluations for the three groups were performed to detect bone height and bone density changes.
These evaluations were performed at the time of overdenture delivery 6,9,12 and 15 months later.
The data were collected and the value of the change between the baseline and various time intervals were calculated and tabulated.
Clinical evaluation of the present study showed significant increase in the flow of G.C.F during the follow up regarding the effect of time and insignificant difference between group I and II as related to abutment designs 12 months after denture insertion.
At the end of the study group II was significantly higher than group I.
Pocket depth measurements revealed significant increase at the end of the study period.
Insignificant difference between abutment designs was detected regarding the effect of different treatment modalities.
The results of radiographic evaluation revealed changes of bone height in the three groups. Bone height reduction was significantly higher in group III compared to group I and II. Furthermore, bone height reduction was significantly higher 1.5cm distal to abutment in all groups.
Regarding the optical bone density, group I and II showed significant gradual increase in density.
The increased bone density was lower 1.5cm distal to abutment teeth. On the other hand, in group III ”submerged” a decrease in optical bone density was detected and the decrease was higher 1.5cm distal to abutment.