Sectional impressions for mandibular distal extension removable partial dentures.
BACKGROUND
Corrected impression procedures provide the best possible support to be gained from an edentulous ridge for a removable partial denture, but they are time-consuming and technique-sensitive.


OBJECTIVE
An experimental mandibular distal extension removable partial denture was used to measure the vertical movement of denture bases during biting.


METHODS
Five patients participated for whom vertical movement of denture bases was measured by comparing the thickness of plaster interocclusal records made with the denture at rest and under biting pressure. Denture bases were processed on master casts formed from final impressions made in full arch custom trays. Secondly, bases were readapted using sectional relining impressions with the same regular body polysulfide impression material.


RESULTS
Statistical analysis of the vertical movement of denture bases during biting at 4 points on the right and left denture bases showed a significant decrease in vertical movement with sectional impression. The reduction was less than a 0.1 mm, a result that questions the routine use of sectional impression for every distal-extension mandibular removable partial denture.


CONCLUSIONS
Supportive form of distal-extension edentulous ridges can be recorded successfully by full arch impressions in custom trays.
Department of Prosthetic Dental Science, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
H A
HA
el-Sheikh
A M
AM
Abdel-Hakim
D000328:Adult; D000704:Analysis of Variance; D001732:Bite Force; D002133:Calcium Sulfate; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000295:instrumentation; D003766:Dental Occlusion; D003819:Denture Bases; D003779:Denture Design; D003823:Denture Rebasing; D003832:Denture, Partial, Removable; D005260:Female; D006801:Humans; D007574:Jaw Relation Record / Q000295:instrumentation; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation*; D008334:Mandible; D008875:Middle Aged; D011312:Pressure; D013440:Sulfides / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
D003760:Dental Impression Materials; D013440:Sulfides; C032915:polysulfide; D002133:Calcium Sulfate