TY - JOUR
T1 - Rapid palatal expansion
T2 - Part 1. Mineralization pattern of the midpalatal suture in cats.
AU - Vardimon, A. D.
AU - Brosh, T.
AU - Spiegler, A.
AU - Lieberman, M.
AU - Pitaru, S.
N1 - Funding Information:
Supported in part by Preminger Foundation grant 960070 and by Lefco Foundation grant 960680. From the Department of Orthodontics a and Department of Oral Biology,b Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University. Reprint requests to: Dr. Alexander D. Vardimon, Department of Orthodontics, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv 69978, Israel. Copyright 9 1998 by the American Association of Orthodontists. 0889-5406/98/$5.00 + 0 8/1/82408
PY - 1998/4
Y1 - 1998/4
N2 - The mineralization pattern of the midpalatal suture after rapid palatal expansion was investigated in 10 treated and 2 control cats, in light of the tendency of RPE to relapse. The rapid palatal expansion treatment consisted of active (25 days), retention (60 days), and relapse (60 days) phases. Standardized occlusal radiographs were taken periodically and analyzed for suture width, suture optical density in anterior vs. posterior regions, and suture area measurements of radiopaque vs. radiolucent zones. Nine cats exhibited suture splitting. During the active phase, the radiolucent zone (nonmineralized tissue) increased 12-fold and the increase in optical density was 50% greater in the anterior over the posterior suture region, demonstrating increased formation of loose connective tissue at the anterior region. During the retention period, the suture's radiopaque zone (mineralized tissue) increased by 62%, the radiolucent zone declined (64%) and the suture width decreased (65%) indicating reorganization of mineralized tissue. The decrease in optical density (increased mineralization) was 2.5 times greater in the posterior over the anterior suture region, indicating that the remineralization (closure) pattern of the expanded suture is analogous to a zipper closed in a posteroanterior direction. During the relapse phase, the reduction in total suture area (41%) and in the radiopaque zone (32%) indicates medial convergence of the maxillary horizontal processes. From our findings we extrapolated that the retention of the suture anterior region should be longer than the posterior region to catch up the lag in rebuilding and maturation of the newly deposited hard tissue.
AB - The mineralization pattern of the midpalatal suture after rapid palatal expansion was investigated in 10 treated and 2 control cats, in light of the tendency of RPE to relapse. The rapid palatal expansion treatment consisted of active (25 days), retention (60 days), and relapse (60 days) phases. Standardized occlusal radiographs were taken periodically and analyzed for suture width, suture optical density in anterior vs. posterior regions, and suture area measurements of radiopaque vs. radiolucent zones. Nine cats exhibited suture splitting. During the active phase, the radiolucent zone (nonmineralized tissue) increased 12-fold and the increase in optical density was 50% greater in the anterior over the posterior suture region, demonstrating increased formation of loose connective tissue at the anterior region. During the retention period, the suture's radiopaque zone (mineralized tissue) increased by 62%, the radiolucent zone declined (64%) and the suture width decreased (65%) indicating reorganization of mineralized tissue. The decrease in optical density (increased mineralization) was 2.5 times greater in the posterior over the anterior suture region, indicating that the remineralization (closure) pattern of the expanded suture is analogous to a zipper closed in a posteroanterior direction. During the relapse phase, the reduction in total suture area (41%) and in the radiopaque zone (32%) indicates medial convergence of the maxillary horizontal processes. From our findings we extrapolated that the retention of the suture anterior region should be longer than the posterior region to catch up the lag in rebuilding and maturation of the newly deposited hard tissue.
UR - http://www.scopus.com/inward/record.url?scp=0032042314&partnerID=8YFLogxK
U2 - 10.1016/s0889-5406(98)70245-8
DO - 10.1016/s0889-5406(98)70245-8
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AN - SCOPUS:0032042314
SN - 0889-5406
VL - 113
SP - 371
EP - 378
JO - American Journal of Orthodontics and Dentofacial Orthopedics
JF - American Journal of Orthodontics and Dentofacial Orthopedics
IS - 4
ER -