The Use of Injectable Polyvinylsiloxane as Medium for Border-Molding Denture Impressions G. Roger Troendle, iWS, DDS" and Karen B. Troendle, DDST This article describes a technique for making a denture impression using polyvinylsiloxane material to border-mold a custom tray. This material is more acceptable to both dentist and patient because it is not as messy or time-consuming as modeling compound. The disadvantage is the initial cost of the materials. JProsthod I: 121-123. Copyright 0 1992 by the American College of Prosthodontists. INDEX WORDS: denture, impression HE CONCEPT of molding the periphery of a T complete denture prosthesis to the surrounding musculature has been accepted and taught for about 75 years. The classic technique involves making an irreversible hydrocolloid impression of the ridge, pouring a cast, and fabricating a custom tray. The custom tray is made short of the apparent peripheral extent of the final prosthesis. The tray is then sectionally border-molded using a thermoplastic im- pression conipound to develop the proper peripheral extent. Once the tray iq border-molded, a wash impression is made to complete the final impression. The technique to be described does not vary in concept from this classic technique. 'The primary difference between this technique and the classic technique is the material used to border-mold and wash the final impression. Technique Make a custom tray on a cast made from an irreversible hydrocolloid impression (Fig 1). Evaluate the custom tray in the patient's mouth to ensure that it is short of the estimated periph- ery ofthe final prosthesis (Fig 2). With a no. 8 round bur in a straight handpiece, perforate the complete periphery of' the tray (Fig 2). 4. Place adhesive on the labial flange of the tray. Place the tray in the mouth, and inject Kerr Stat B.R. (Kerr Manufacturing Company, Romulus, MI; Fig 3) arid mold the material to the labial musculature (Fig 4). If needed, excess material can be trimmed with a sharp #25 surgical blade after the material sets. 5. The maxillar). tray is molded in four segments, the labial flange, right buccal flange, left buccal flange, and posterior palatal flange. Figure 5 show the complete border-molded impression tra)-. 6. The remainder of the tray is painted with adhe- sive, and then medium-viscosity polyvinylsiloxane impression material is injected in the tray, plact-d in the patient's mouth, and border-molded. Fig From the Unitenip ofTexas Health Srirnce Center ut San Antonio. TAssociate Pmjssor. Dqartment ofliesloratiue Dentirty!. 'Clinical Assm'ate Projfrsor, Drpartmenl qfhktorative Dentisty Address repint reqimts to Karen H. Troendle. DDS, Dept ofRestorative Dentisty, The L'niuertip~Texnr Heallh Science Center at San Antonio, 7703 Flyd Curl&, San Antonio, 7X 782847890, San Antonio. TX. Copyjqht 0 1992 b)) the Am~rican College q/Prosthodontists I059-Y41X/9210102-0011~5.00~ 0 Figure 1. Custom tray made on preliminary cast. Journal ofProsthodontics, Vol 1, No 2 (December), lYY2:pp 121-12.7 121
The Use of Injectable Polyvinylsiloxane as Medium for
Border-Molding Denture Impressions G. Roger Troendle, iWS, DDS"and
Karen B. Troendle, DDST Thisarticledescribes
atechniqueformakingadentureimpressionusingpolyvinylsiloxane materi
alt o border-mol d a custom t ray. This materi alis more acceptable
t o bot h denti st and pati ent because it i s notas messy or
time-consuming as modeling compound. The disadvantage is t he i ni
ti alcost of t he materials. JProsthodI :121-123. Copyright 0 1992
by the American College of Prosthodontists. INDEX WORDS: denture,
impression HE CONCEPT of molding theperiphery of a Tcomplete
denture prosthesis to the surrounding musculature has been accepted
and taught for about 75 years. The classic techniqueinvolves making
an irreversiblehydrocolloidimpressionoftheridge, pouringa cast, and
fabricating a custom tray. The custom tray is made short of the
apparent peripheral extentofthefinalprosthesis.Thetrayisthen
sectionally border-molded using a thermoplastic im- pression
conipound to develop the proper peripheral extent.Oncethetrayi
qborder-molded,awash impression is made to complete the final
impression. The techniqueto bedescribed does not vary in
conceptfromthisclassic technique.'The primary
differencebetweenthistechniqueandtheclassic techniqueis the
materialused to border-moldand wash the final impression. Technique
Makeacustomtrayonacastmadefrom an irreversible hydrocolloid
impression (Fig 1). Evaluate the custom tray in the patient'smouth
to ensure that it is short of the estimated periph- ery ofthe final
prosthesis (Fig 2). With a no. 8 round bur in a straighthandpiece,
perforate the complete periphery of' the tray (Fig 2). 4.Place
adhesive onthelabial flange ofthetray. Place the tray in the mouth,
and inject Kerr Stat B.R.(Kerr ManufacturingCompany,Romulus, MI;
Fig 3)aridmold thematerial tothe labial musculature(Fig 4).
Ifneeded, excess material can be trimmed with a sharp #25surgical
blade after the material sets. 5.The maxillar). trayis moldedin
four segments, the labial flange, right buccal flange, left buccal
flange,andposteriorpalatalflange.Figure5
showthecompleteborder-moldedimpression tra)-. 6. The remainder of
the tray is painted with adhe- sive, and then medium-viscosity
polyvinylsiloxane impression material is injected in the tray,
plact-d inthe patient'smouth, and border-molded.Fig FromtheUnitenip
ofTexas HealthSrirnceCenter utSan Antonio. TAssociate Pmjssor.
Dqartment ofliesloratiue Dentirty!. 'Clinical Assm'ate Projfrsor,
Drpartmenl qf hkt orat i ve Dentisty Address repint reqimts to
Karen H.Troendle. DDS, DeptofRestorative Dentisty,TheL' ni uert i
p~TexnrHeallhScience Center at San Antonio, 7703 Flyd Curl&,San
Antonio,7 X 782847890, San Antonio.TX. Copyjqht 0 1992 b)) the
Am~ricanCollege q/Prosthodontists I059-Y41X/9210102-0011~5.00~0
Figure 1.Custom tray madeon preliminary cast.
JournalofProsthodontics, Vol 1, No 2 (December), lYY2:pp 121-12.7
121 Figure 2.The customtray is trimmed short of the border and the
holes are drilled in the periphery of the tray.
Figure3.Theinjectablepolyvinylsiloxanematerials, Stat B.R. for
border molding, and Express medium viscos- ity for the wash.
Figure5.Theimpressionaftertheborderhasbeen molded. Figure
4.Injecting the Stat B.R. at the labial border of the custom tray.
December 1992, r(16urne I .i%imber2123 ure6shows
acompletedinipressionusingthis technique. Figure7shows the labial
view ofthe master cast ponred from this impression. Discussion
Atechniquewasprcsentcdforborder-moldinga custom tray with a
quick-set? high-viscosity polyvinyl- siloxane material(Stat
B.R.;Kerr)andmakinga wash with a medium-viscosity polyvinylsiloxane
im- pression material (Express; 3M Dental Products, St Paul, MN).
The technique was described for a maxil- lary overdenture, but is
useful for complete dentures, both upper and lower. The principle
of activating thc musculatureat the periphery of the denture is the
sameaswhenusingtheclassictechniquewith
thermoplasticcompound.However,thetechnique using the
polyvinylsiloxane material is more accept- able to the patient and
dentist. Figure 6.Thc final impression after being washed with
medium-viscosity polyTinylsiloxane impression material. Figure
7.Labial view of the cast porired from the impres- sion showing the
labial flange recorded on the master cast.
