H. Elsheikh et Am. Abdelhakim, SECTIONAL IMPRESSIONS FOR MANDIBULAR DISTAL-EXTENSION REMOVABLE PARTIAL DENTURES, The Journal of prosthetic dentistry, 80(2), 1998, pp. 216-219
Statement of problem. Corrected impression procedures provide the best
possible support to be gained from an edentulous ridge for a removabl
e partial denture, but they are time-consuming and technique-sensitive
. Purpose. An experimental mandibular distal extension removable parti
al denture was used to measure the vertical movement of denture bases
during biting. Material and methods. Five patients participated for wh
om vertical movement of denture bases was measured by comparing the th
ickness of plaster interocclusal records made with the denture at rest
and under biting pressure. Denture bases were processed on master cas
ts formed from final impressions made in full arch custom trays. Secon
dly, bases were readapted using sectional relining impressions with th
e same regular body polysulfide impression material. Results. Statisti
cal analysis of the vertical movement of denture bases during biting a
t 4 paints on the right and left denture bases showed a significant de
crease in vertical movement with sectional impression. The reduction w
as less than a 0.1 mm, a result that questions the routine use of sect
ional impression for every distal-extension mandibular removable parti
al denture. Conclusion. Supportive form of distal-extension edentulous
ridges can be recorded successfully by full arch impressions in custo
m trays.