Stress distribution prevents ischaemia and bone resorption in residual ridge.
OBJECTIVE
Intensive mechanical stress and/or inflammation are known to induce alveolar bone resorption. This study investigated whether a distribution of mechanical stress would reduce residual ridge resorption or improve ischaemia.


METHODS
Thirty rats were divided into six experimental groups (n=5). The control group received no intentional stimulation, but rats in the experimental groups wore denture stimulators made of acrylic resin or a soft lining material. The stimulator transmitted masticatory pressure to the rats' palates for four weeks. The four types of soft lining materials investigated in this study dispersed the applied pressure, with compressive stress ranging from 20.8 to 90.8kPa. Volumes of blood flow and bone resorption of denture foundations were measured every week for 4 weeks. Statistical evaluation of these results was performed using two-way ANOVA and Holm-Sidak test within 5% error limits.


RESULTS
Non-viscoelastic material clearly induced bone resorption and ischaemia of denture foundations, while viscoelastic materials reduced these phenomena to different extents according to their viscoelastic properties. Ischaemia in the alveolar ridge preceded residual ridge resorption, because the amount of residual ridge resorption and blood flow rate showed a simple linear regression.


CONCLUSIONS
Animal model of this study suggested that a distribution or reduction of mechanical stress could improve blood flow and decrease alveolar ridge resorption.
Maruo
Yukinori
Y
Okayama University Hospital, Shikata-cho, Okayama City, Japan. ykmar@md.okayama-u.ac.jp
Nishigawa
Goro
G
Irie
Masao
M
Oka
Morihiko
M
Hara
Tetsuya
T
Suzuki
Kazuomi
K
Minagi
Shogo
S
D016301:Alveolar Bone Loss / Q000503:physiopathology* / Q000517:prevention & control*; D000539:Alveolar Process / Q000098:blood supply* / Q000503:physiopathology*; D000704:Analysis of Variance; D000818:Animals; D001783:Blood Flow Velocity; D019245:Compressive Strength; D003799:Dental Stress Analysis; D003819:Denture Bases; D007511:Ischemia / Q000503:physiopathology* / Q000517:prevention & control*; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D013314:Stress, Mechanical