recording the occlusion Flashcards
why do you need to record the occlusion?
need to know:
position of teeth in relation to each other
what is normal for px to keep same
if planning to change occlusion
to facilitate denture design
ensuring loading forces applied correctly to teeth and underlying mucosa/bone
help tech set up teeth
ensure denture stable and not dislodged in function
when can you record the occlusion?
primary registration
secondary registration
framework registration
why should you record occlusion at primary registration stage?
to examine the occlusion
to facilitate denture design
to mount surveyed primary casts
to position denture components w/o occlusal interference
why would you record occlusion at primary stage?
prior to denture design if you cant hand articulate
-helps mount casts
why would you record occlusion at secondary stage?
helps mount casts on framework design wax record blocks on master casts if primary was incorrect if you plan to change the occlusion the case is complex w/ extended edentulous spaces to replace multiple anterior teeth
why would you record occlusion at framework registration?
further trial on framework, esp in extended anterior saddle for good aesthetics if no primary to accurately mount master casts to replace multiple anterior teeth plan to change occlusion error with prev registration extended edentulous spaces
what is the aim when recording occlusion?
inform tech where you want artificial teeth to be positioned, shade and mould with info on how teeth occlude
what should be established when recording occlusion?
inter-cuspal relationship to articulate casts OCD buccal/labial contours of wax record block -lip support -incisal plane -occlusal plane tooth shade and mould `
what equipment is needed?
perform -disinfect record blocks before try in -after contamination anything goint to lab-cast/record blocks bowl cold water -chill blocks to avoid distortion when inserted/removed/adjusted to put out fires willis bite guage/dividers -record OVD -in ICP knife & bunsen -to adjust blocks -palette for height/buccal surfaces -wax/ash no. 5 to remove wax when shaping arch form/add notches pink wax/registration paste -join blocks together
what is the 2 dot method?
to record OVD
point on nose & chin with minimal movement
teeth in ICP
distance between divider arms=ovd
how do you use a willis bite guage?
teeth in ICP
fixed arm naso labial position
sliding arm under chin
distance =ovd
how many mm should OVD be?
2-3mm
-freeway space
how do you calculate freeway space?
RVD-OVD
how should you adjust the blocks?
one at a time blocks must stay in place modify to produce stability wax knife adjust upper fist occlusal, buccal and lingual/palatal
what problems can cause displacement?
overextension of peripheries =drop
too much lip support
what reference points can be used when adjusting?
teeth present dento-facial midline inter-pupillary line ala-tragus line curvature of lower lip smile line gingival margins of existing anterior teeth previous dentures
how to use ala-tragus line?
adjust upper occlusal rim so occlusal plane is oriented in relation to upper teeth/ala-tragus line
if posteriors present follow
how is dento-facial midline used?
dental centre line coincident with facial midline
when multiple anteriors missing
may not have naturally occuring
what is interupillary line used for?
a guide to where upper incisal plane should be
what is incisal plane for?
follow curvature of lower lip/teeth present
what can skew reference points?
drifting of anterior teeth
over-eruption out of occlusal plane
what does foxes occlusal plane guide help?
recreate occlusal and incisal planes on record block when extended edentulous spaces
how should you adjust upper blocks?
upper occlusal rim so plane is appropriately oriented
if anterior saddle ensure rim indicates appropriate incisal level and degree lip support
check occlusal stop when px occludes
if tooth surfaces separated trim offending part of rim until occlusal stop re-established
how should you adjust the lower blocks?
trim lower rim until occlusal stop established
add/remove wax from buccal/lingual until centre of rim lies over lower ridge and is same width as replacement teeth
upper should be harmonised w/ lower in accordance with skeletal relationship
how do you register the occlusion?
modify u&L rims so small space between occlusal surface of rim and opposing
reocord max intercuspation using registration material
occlude casts using occlusal rims and check tooth relationship on casts is same as mouth
is premature contact eliminate
how do you achieve good aesthetics in an extended anterior saddle?
make sure index teeth in occlusion
mark centreline
mark canine positions if missing
mark high smile line
what helps to select tooth shade?
existing teeth
previous denture
px preference
what helps to select tooth mould?
existing teeth
previous denture
measure
what are the steps for recording occlusion?
adjust upper block adjust lower block maintained ICP join blocks together w/ registration medium put in perform pick teeth
