Effect of locally delivered doxycycline hyclate on human fibroblast attachment to subgingival calculus.
BACKGROUND
Clinical studies using locally applied doxycycline hyclate (DHV) have demonstrated significant probing depth reduction and gain in clinical attachment as a monotherapy without scaling and root planing. The mechanism for this attachment level gain to the non-root planed tooth is not understood. The purpose of this study was to investigate the effect of locally applied doxycycline hyclate on human gingival fibroblast attachment to subgingival calculus on contaminated root surfaces.


METHODS
Two separate experiments were performed, both on subgingival calculus. In experiment 1, teeth with subgingival calculus were treated with either doxcycycline hyclate in bioabsorbable vehicle (DHV) or with vehicle control (VC) in vivo. In experiment 2, teeth with subgingival calculus were treated with DHV, VC, scaling and root planing (SRP), or no treatment in vitro. The amount of cell attachment to calculus-covered root surfaces was quantitatively compared using a fluorescent dye assay and epifluorescence microscope. Values for cell attachment are presented as the mean standard deviation of the mean. The data were evaluated using Student t test.


RESULTS
In both experiments, there was no statistically significant difference in fibroblast attachment in the DHV, VC, or no treatment groups (P >0.05). The SRP group showed significantly more cellular attachment to tooth surfaces formerly covered by subgingival calculus than all other groups (P <0.001). In general, more cells attached to cementum than to calculus. Root chips that showed no attachment to the subgingival calculus also had no cells attached to the adjacent cemental root surface.


CONCLUSIONS
The addition of doxycycline hyclate in a bioabsorbable vehicle used as a locally delivered drug did not enhance the initial cellular attachment of human gingival fibroblasts to subgingival calculus or contaminated root surfaces.
Departments of Periodontics, School of Dentistry, Louisiana State University, New Orleans, LA, USA.
Amer
A
Sayed-Suleyman
Raymond A
RA
Yukna
Sotirios
S
Vastardis
Don
D
Layman
Thomas
T
Lallier
D020341:Absorbable Implants; D000900:Anti-Bacterial Agents / Q000008:administration & dosage*; D002448:Cell Adhesion / Q000187:drug effects*; D002478:Cells, Cultured; D003728:Dental Calculus / Q000188:drug therapy*; D003739:Dental Cementum; D012534:Dental Scaling; D004318:Doxycycline / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D005347:Fibroblasts; D005881:Gingiva / Q000166:cytology; D006801:Humans; D014677:Pharmaceutical Vehicles; D011091:Polyesters
D000900:Anti-Bacterial Agents; D014677:Pharmaceutical Vehicles; D011091:Polyesters; C033616:poly(lactide); D004318:Doxycycline