RidgePreservationoftheMolarExtractionSocketUsingCollagenSpongeandXenogeneicBoneGraftsYoung-KyunKim,DDS,PhD,*Pil-YoungYun,DDS,PhD,†Hyo-JungLee,DDS,PhD,‡Ji-YeonAhn,DDS,§andSu-GwanKim,DDS,PhD�Ithasbeenreportedthattheresorp-tionoftheresidualalveolarboneinthevicinityofextractionsocketsoc-cursprimarilyduringtheinitialperiodaftertoothextraction,andincaseswithteethinfectedwithperiodontaldiseases,itshowsmorewidely.1,2Chenetal,3andSchroppetal4havereportedthat6to12monthsaftertoothextraction,0.34to7.7mmhorizontaland0.2to3.25mmver-ticalbonelossoccurs,andboneresorp-tionoccursmostabundantlyduringtheinitial3months.Theprogressionofboneresorp-tionafterextractionrenderstheplace-mentofimplantdifficultorinducesthedifficultyofmanufacturingpros-thesisinthefutureandthemanage-mentoforalhygieneinthevicinityofimplants.Therefore,byapplyingdi-versemethods,effortshavebeenmadetopreservethealveolarridgeandtopreventboneresorption.Ithasbeenreportedthatbonesubstitutionmateri-alssuchasHTR,BioOss,DFDBA,Bioglass,Hydroxyapatite,andmateri-alssuchascollagen,polylactide,andpolyglycolidespongewereusedaloneorincombination,andtheresorptionofthealveolarbonewasless.5–9Darbyetal10reportedthatitismorepreferabletoperformridgepres-ervationintheareawherethethick-nessofthebuccalboneplateislessthan1.5to2mm.Casesinwhichseveralteethwereextracted,majoran-atomicalstructuressuchasthemaxil-larysinusandmandibularcanalwerelocatedintheadjacentarea,thearearequiringhighaesthetics.Ontheotherhand,thenegativeopiniononalveolarpreservationtech-niquewasalsopresented.Rothameletal11havereportedinastudyonthesocketpreservationusingnanocrystal-linehydroxyapatitepastethatduetotheunpredictableresorptionofmaterials,theeffectofalveolarridgepreservationtechniquewasnotuseful.Beckeretal12andPinholtetal13havereportedthatincasesthatgraftedbonesubstitutionma-terialstoextractionsockets,graftmate-rialsmayimpedethenormalhealingprocessoftheextractionsocketitselfortheextractionsocketwithimplantplace-*AssociateProfessor,DepartmentofOralandMaxillofa...
