ABOMS PRACTICE EXAM QS EXAM
2026 | PRACTICE QUESTIONS,
VERIFIED ANSWERS & DETAILED
RATIONALES | OMS BOARD
CERTIFICATION PREP
Patientsnwithndentofacialndeformitiesnundergoingncorrectivenorthognathicnsurgerynhavenbeennfou
ndntonreport:n-
nCORRECTnANSWERanpositivenimpactnonntheirnqualitynofnlifendespitenpersistencenofnneurosensoryn
disturbances.
Whatnisnthentreatmentnmodalitynwithnthenbestnpostoperativenstabilityninnanpatientnwithnactivenunil
ateralncondylarnhyperplasianandnClassnIInmalocclusion?n-
nCORRECTnANSWERunilateralnhighncondylectomynandnsimultaneousnorthognathicnsurgery
Whichnofnthenfollowingnbestndescribesntheneffectnofnmandibularnadvancementnviandistractionnoste
ogenesisn(MDO)nonnapnea-hypopneanindexn(AHI)ninninfantsnwithnobstructivensleepnapnea?n-
nCORRECTnANSWER1nmmn=n1npointndecreaseninnAHI
Bonengraftnvolumenoutcomesninnunilateralncleftnpatientsnarenmostnimprovednby:n-
nCORRECTnANSWERpre-surgicalnorthodonticntreatment.
Andisadvantagenofnannintraoralnverticalnramusnosteotomyn(IVRO)ncomparedntonansagittalnsplitnramu
snosteotomyn(SSRO)nfornthenmanagementnofnmandibularnprognathismnis:n-
nCORRECTnANSWERannincreasednneednfornmaxillomandibularnfixationn(MMF).
Craniofacialnmicrosomianisnassociatednwithndysfunctionnofncranialnnerve:n-nCORRECTnANSWERVII
,Craniofacialnmicrosomianpatientsnwithnobstructivensleepnapneanhavenwhichnofnthenfollowingnairwa
yncharacteristicsncomparedntonthosenwithoutnobstructivensleepnapnea?n-
nCORRECTnANSWERdecreasednnasopharyngealnvolume
Thenbestntreatmentnfornanskeletallynmaturenpatientnwithnprogressivenjuvenilenidiopathicn(rheumat
oid)narthritisnwhonhasnmoderatenasymmetrynandnverticalnheightnlossnis:n-
nCORRECTnANSWERoptimizensystemicntreatment
Thenaveragendistancenfromnmostninferiornpointnofnthenpterygomaxillarynjunctionntonthenmaxillaryna
rterynis:n-nCORRECTnANSWER18.2
Comparednwithnsecondarynalveolarngraftingn(agen6-12nyrs),nprimarynalveolarngraftingn(agen1-3):n-
nCORRECTnANSWERinhibitsngrowthnmorenprofoundly
Whichnmusclenisnexcludednfromnstimulationnbynthenhypoglossalnnervenstimulator?n-
nCORRECTnANSWERstyloglossus
Whichnmodificationnofnthenthenbilateralnsagittalnsplitnmandibularnosteotomynallowsnfornincreasedn
osseousnsurfacencontactntonenhancenbonynunion?n-nCORRECTnANSWERdalpont
Growthnalongnwhichnbonynsuturenmaynbecomenmostnrestrictednfollowingnprimaryncleftnpalatenrep
air?n-nCORRECTnANSWERnasomaxillary
Whennassessingnthenlong-
termneffectivenessnofnmaxillomandibularnadvancementnfornthentreatmentnofnmoderatentonseveren
obstructivensleepnapnea,nwhichnofnthenfollowingnmetricsnarenimproved?n-
nCORRECTnANSWERdiastolicnBP
, WhichnpreoperativenparameterninncleftnpatientsnundergoingnFurlownpalatoplastynplaysnanroleninnpr
edictingnpostoperativenvelopharyngealninsufficiencyn(VPI)?n-
nCORRECTnANSWERpreoperativenvelarnclosurenratio
WithnregardntoninfantsnwithnRobinnSequence,nwhichnofnthenfollowingnresultsninnthenmostneffectivenl
ong-termnimprovementnofnOSAS?n-nCORRECTnANSWERmandibularndistractionnosteo
Afternmaxillomandibularnadvancementnfornobstructivensleepnapnea,nwhichnofnthenfollowingnhasnth
engreatestneffectnonnreducingnuppernairwaynresistance?n-
nCORRECTnANSWERincreasentransversendimension
Innpatientsnwithncleftnlipnandnpalate,nwhatnpercentagendonnotnhavenanlateralnincisornonnthenaffecte
dnside?n-nCORRECTnANSWER50%
Thenlargestnincreaseninnairwaynvolumenfollowingnmandibularndistractionnosteogenesisninninfantsnw
ithnPierrenRobinnSequencenoccursnatnwhichnofnthenfollowingnlevels?n-
nCORRECTnANSWERretroglossal
Whatnisnthenpercentagenofnpostoperativeninfectionsnwhennsurgicallynuprightingnimpactednsecondn
molars?n-nCORRECTnANSWER1.9%
Whatnisnthenmostncommonlyncongenitallynmissingnpermanentntooth?n-
nCORRECTnANSWERthirdnmolar
Whichntypenofntraumantonthentoothnisnmostnassociatednwithnrootnresorption?n-
nCORRECTnANSWERintrusion
Lingualnnervenanatomynatnthirdnmolarn-nCORRECTnANSWERdeepntonthenperiosteum
2026 | PRACTICE QUESTIONS,
VERIFIED ANSWERS & DETAILED
RATIONALES | OMS BOARD
CERTIFICATION PREP
Patientsnwithndentofacialndeformitiesnundergoingncorrectivenorthognathicnsurgerynhavenbeennfou
ndntonreport:n-
nCORRECTnANSWERanpositivenimpactnonntheirnqualitynofnlifendespitenpersistencenofnneurosensoryn
disturbances.
Whatnisnthentreatmentnmodalitynwithnthenbestnpostoperativenstabilityninnanpatientnwithnactivenunil
ateralncondylarnhyperplasianandnClassnIInmalocclusion?n-
nCORRECTnANSWERunilateralnhighncondylectomynandnsimultaneousnorthognathicnsurgery
Whichnofnthenfollowingnbestndescribesntheneffectnofnmandibularnadvancementnviandistractionnoste
ogenesisn(MDO)nonnapnea-hypopneanindexn(AHI)ninninfantsnwithnobstructivensleepnapnea?n-
nCORRECTnANSWER1nmmn=n1npointndecreaseninnAHI
Bonengraftnvolumenoutcomesninnunilateralncleftnpatientsnarenmostnimprovednby:n-
nCORRECTnANSWERpre-surgicalnorthodonticntreatment.
Andisadvantagenofnannintraoralnverticalnramusnosteotomyn(IVRO)ncomparedntonansagittalnsplitnramu
snosteotomyn(SSRO)nfornthenmanagementnofnmandibularnprognathismnis:n-
nCORRECTnANSWERannincreasednneednfornmaxillomandibularnfixationn(MMF).
Craniofacialnmicrosomianisnassociatednwithndysfunctionnofncranialnnerve:n-nCORRECTnANSWERVII
,Craniofacialnmicrosomianpatientsnwithnobstructivensleepnapneanhavenwhichnofnthenfollowingnairwa
yncharacteristicsncomparedntonthosenwithoutnobstructivensleepnapnea?n-
nCORRECTnANSWERdecreasednnasopharyngealnvolume
Thenbestntreatmentnfornanskeletallynmaturenpatientnwithnprogressivenjuvenilenidiopathicn(rheumat
oid)narthritisnwhonhasnmoderatenasymmetrynandnverticalnheightnlossnis:n-
nCORRECTnANSWERoptimizensystemicntreatment
Thenaveragendistancenfromnmostninferiornpointnofnthenpterygomaxillarynjunctionntonthenmaxillaryna
rterynis:n-nCORRECTnANSWER18.2
Comparednwithnsecondarynalveolarngraftingn(agen6-12nyrs),nprimarynalveolarngraftingn(agen1-3):n-
nCORRECTnANSWERinhibitsngrowthnmorenprofoundly
Whichnmusclenisnexcludednfromnstimulationnbynthenhypoglossalnnervenstimulator?n-
nCORRECTnANSWERstyloglossus
Whichnmodificationnofnthenthenbilateralnsagittalnsplitnmandibularnosteotomynallowsnfornincreasedn
osseousnsurfacencontactntonenhancenbonynunion?n-nCORRECTnANSWERdalpont
Growthnalongnwhichnbonynsuturenmaynbecomenmostnrestrictednfollowingnprimaryncleftnpalatenrep
air?n-nCORRECTnANSWERnasomaxillary
Whennassessingnthenlong-
termneffectivenessnofnmaxillomandibularnadvancementnfornthentreatmentnofnmoderatentonseveren
obstructivensleepnapnea,nwhichnofnthenfollowingnmetricsnarenimproved?n-
nCORRECTnANSWERdiastolicnBP
, WhichnpreoperativenparameterninncleftnpatientsnundergoingnFurlownpalatoplastynplaysnanroleninnpr
edictingnpostoperativenvelopharyngealninsufficiencyn(VPI)?n-
nCORRECTnANSWERpreoperativenvelarnclosurenratio
WithnregardntoninfantsnwithnRobinnSequence,nwhichnofnthenfollowingnresultsninnthenmostneffectivenl
ong-termnimprovementnofnOSAS?n-nCORRECTnANSWERmandibularndistractionnosteo
Afternmaxillomandibularnadvancementnfornobstructivensleepnapnea,nwhichnofnthenfollowingnhasnth
engreatestneffectnonnreducingnuppernairwaynresistance?n-
nCORRECTnANSWERincreasentransversendimension
Innpatientsnwithncleftnlipnandnpalate,nwhatnpercentagendonnotnhavenanlateralnincisornonnthenaffecte
dnside?n-nCORRECTnANSWER50%
Thenlargestnincreaseninnairwaynvolumenfollowingnmandibularndistractionnosteogenesisninninfantsnw
ithnPierrenRobinnSequencenoccursnatnwhichnofnthenfollowingnlevels?n-
nCORRECTnANSWERretroglossal
Whatnisnthenpercentagenofnpostoperativeninfectionsnwhennsurgicallynuprightingnimpactednsecondn
molars?n-nCORRECTnANSWER1.9%
Whatnisnthenmostncommonlyncongenitallynmissingnpermanentntooth?n-
nCORRECTnANSWERthirdnmolar
Whichntypenofntraumantonthentoothnisnmostnassociatednwithnrootnresorption?n-
nCORRECTnANSWERintrusion
Lingualnnervenanatomynatnthirdnmolarn-nCORRECTnANSWERdeepntonthenperiosteum