IHydroxyapatite: IsiKhokelo esiGqibeleleyo kumaBanga, usetyenziso, kunye neDatha yobuGcisa 

Nokuba wenza intlama yamazinyo entsha enovakalelo, ukhangela ii-biomaterials zokufakelwa kwamathambo, okanye uphanda ngeenkqubo zokuhanjiswa kweziyobisi ezikumgangatho ophezulu, kukho ikhompawundi enye ongenakuyihoya: i-hydroxyapatite.

Kwiminyaka yakutshanje, le mathiriyeli imangalisayo itshintshile ukusuka kuncwadi lwesayensi ye-niche ukuya kwizicelo eziphambili zorhwebo. Iqhutywa yimfuno yabathengi yezixhobo zonyango ezihambelana ne-biocompatible kunye ne-non-toxic, ukhathalelo lomlomo olungena-fluoride, imakethi yehlabathi yesi minerali ikhula ngokukhawuleza.

Ukukunceda ujonge lo mhlaba unzima, sihlanganise isikhokelo esipheleleyo esilungiselelwe abaphuhlisi bemveliso, amaqela okuthenga, kunye neengcali kushishino. Apha ngezantsi, sintywila nzulu kwinto eyiyo i-hydroxyapatite eneneni, amabanga ahlukeneyo orhwebo akhoyo, usetyenziso lwawo oluphambili, iingenelo eziphambili, kunye neenkcukacha zobugcisa.

Yintoni Hydroxyapatite?

Kwisiseko sayo, i-hydroxyapatite (ehlala ifinyeziwe njenge-HAp okanye i-HA) yindlela yendalo ye-mineral ye-calcium apatite. Indlela yayo yeekhemikhali $Ca_{10}(PO_{4})_{6}(OH)_{2}$. Ukuba oko kukhangeleka njengomlomo wekhemistri, khawucinge nje ngale ndlela: yibhloko yokwakha esisiseko senkqubo yamathambo yomntu.

Enyanisweni, i-hydroxyapatite yenza malunga ne-60% ukuya kwi-70% yobunzima bethambo lomntu kunye ne-97% emangalisayo ye-enamel yethu yezinyo-into enzima kakhulu emzimbeni womntu. Ngenxa yokuba imizimba yethu ivelisa ngokwemvelo kwaye ixhomekeke kule minerali, iinguqulelo zayo ezenziweyo zihlelwa njenge-biomimetic. Xa yaziswa kumzimba womntu, nokuba ifakwe emazinyweni okanye ifakwe ngokuthe ngqo kwizicubu zethambo, umzimba awuwuqondi njengomhlaseli wangaphandle. Kunoko, ibandakanya izinto eziphathekayo, ivumela ukudibanisa kunye nokulungiswa okungenamthungo.

Ngokomlando, ukukhupha le minerali kwimithombo yendalo kwakunzima kwaye kuvelise ubunyulu obungahambelaniyo. Namhlanje, imvula yekhemikhali emanzi ephucukileyo kunye ne-sol-gel synthesis ivumela abavelisi ukuba benze i-synthetic hydroxyapatite elinganisa ngokugqibeleleyo iminerali yethambo lomntu, eyenzelwe ubungakanani bamasuntswana achanekileyo kunye namanqanaba okucoceka.

AmaBanga eMveliso kunye neNgcaciso

Ayiyiyo yonke i-hydroxyapatite eyenziwe ngokulinganayo. Inkqubo yokuvelisa ichaza ubungakanani besuntswana, i-morphology, kunye nokucoceka komgubo wokugqibela, ochaza ibakala layo lokuthengisa. Ukukhetha ibakala elichanekileyo kubalulekile kuthotyelo lolawulo kunye nokusebenza ngempumelelo kwemveliso.

1. IBanga lobuNyango (Olufakelwayo)

Eli lelona nqanaba liphezulu kwaye lilawulwa ngokungqongqo. I-hydroxyapatite ye-Medical-grade kufuneka ibonise ukucoceka okuphezulu kunye nomlinganiselo ochanekileyo weCalcium-to-Phosphorus (Ca / P) malunga ne-1.67, ehambelana ngokugqibeleleyo nethambo lendalo. Iphantsi kovavanyo olungqongqo lokungcoliseka kwesinyithi esinzima, i-cytotoxicity, kunye ne-endotoxins yebhaktiriya. Uya kufumana eli bakala lisetyenziswa kwizizalisi ze-bone void, i-spinal fusion scaffolds, kunye ne-bioactive coating ye-titanium orthopedic kunye nokufakelwa kwamazinyo.

2. Ukhathalelo loMlomo kunye neBanga leZithambiso

Iqhutywa ubukhulu becala bubuhle obukhulayo kunye neemarike zempilo, eli bakala lenzelwe ukusetyenziswa kwezihloko. Olona luhlu lusezantsi ludumileyo apha i-nano-hydroxyapatite (nHAp). Ngenxa yokuba iityhubhu zamazinyo (imingxunyana emincinane emazinyweni akho) i-microscopic, la masuntswana kufuneka enziwe abe ne-nano-scale (ngokuqhelekileyo ephakathi kwama-20 ukuya kuma-60 eenanometers) ukuze akwazi ukungena aze azalise ezo zithuba. Isetyenziswa kakhulu kwiprimiyamu yokuthambisa yamazinyo, ukuvasa umlomo, kwaye ngamanye amaxesha kukhathalelo lwesikhumba njenge-oyile efunxa i-oyile, i-ejenti egxile ethambileyo.

3. IBanga loPhando kunye neChromatography

Isetyenziswa ngokungqongqo kwiindawo zelebhu, eli bakala lenzelwe uhlalutyo lwenzululwazi. Amasuntswana e-hydroxyapatite e-Spherical aneentlawulo zomphezulu ezizodwa, zizenza izigaba ezibalaseleyo zokumisa kwiikholamu zechromatography. Iingcali zebhayoloji zisebenzisa eli bakala ukwahlula kunye nokucoca iiproteni ezintsonkothileyo, ii-enzymes, kunye ne-nucleic acids ngokusekwe kwindlela ezi molecule zebhayoloji zibophelela ngayo kwiindawo zecalcium kunye nephosphate kumphezulu wezimbiwa.

Usetyenziso oluphambili

Iipropati ezizodwa ze-biomimetic ze-hydroxyapatite zivule uluhlu oluhlukeneyo lwezicelo kumashishini amaninzi.

Ukhathalelo loMlomo kunye noNyango lwamazinyo

Eli lelona candelo lezorhwebo likhula ngokukhawuleza kwizimbiwa. Njengoko abathengi besanda befuna ezinye iindlela ze-fluoride yendabuko, i-hydroxyapatite iye yavela njengomgangatho wegolide wokubuyisela izinyo kwakhona. Xa uhlanjululwe kumazinyo, iinqununu ze-nano-size zibophezela ngokuthe ngqo kwi-enamel, zizalise i-microscopic scratches kunye ne-fissures. Lo matshini awukhuseli ngokwasemzimbeni kuphela imithambo-luvo—ukunciphisa kakhulu uvakalelo lwamazinyo—kodwa ikwashiya amazinyo ekhangeleka egudileyo ngokwendalo, ecwebezelayo, kwaye emhlophe ngaphandle kokusetyenziswa kweekhemikhali ezirhabaxa zokutshiza.

I-Orthopedics kunye ne-Bone Grafts

Kutyando lokuvuselela, ukulungisa iziphene ezinzulu zamathambo kufuna izinto ezinokuxhasa ukukhula kwezicubu ezintsha. I-Hydroxyapatite isebenza njenge-scaffold osteoconductive. Xa ipakishwe kwithambo elingenanto, ibonelela ngesakhelo somzimba kwiiseli zethambo zesigulana (i-osteoblasts) ukuba zinamathele, zande, kwaye zibeke phantsi i-matrix yamathambo entsha. Ngokuhamba kwexesha, i-hydroxyapatite ene-porous kakhulu iphinda ihlaziywe ngumzimba kwaye ithathelwe indawo lithambo lendalo eliphilayo.

IiNkqubo zoNxibelelwano lweZiyobisi eziPhezulu

Ngenxa yokuba i-hydroxyapatite yokwenziwa inokuthi yenziwe ukuba ibe ne-porous kakhulu, abaphandi bayisebenzisa ngokusebenzayo njenge-carrier yokuhanjiswa kweziyobisi ekujoliswe kuzo. Iminerali inokulayishwa kunye ne-antibiotics, iziyobisi ezichasayo, okanye i-chemotherapeutic agents. Nje ukuba ifakwe kwindawo yotyando (enjengendawo yokususa ithumba lethambo), ibonelela ngokucotha, kwasekhaya, kunye nokukhululwa okuzinzileyo kweyeza njengoko iminerali iqhekeka kancinci, inciphisa iziphumo ebezingalindelekanga zenkqubo.

Iingenelo ezingundoqo

Kutheni le nto iinjineli zemveliso kunye neengcali zonyango zihlala zikhetha le mathiriyeli ngaphezu kwezinye ii-bioceramics okanye iipolymers zokwenziwa? Impendulo ilele kwiinzuzo zayo ezine eziphambili:

• I-Biocompatibility ekhethekileyo: Ngenxa yokuba yabelana ngokuthe ngqo kwimichiza eyenziwe ngamathambo omntu kunye ne-enamel, ibangela ukuba kusondele ukudumba okanye iimpendulo ze-immunological immune system xa ziziswa emzimbeni.

• I-Osteoconductivity ephezulu: Ayihlali nje apha emzimbeni; ikhuthaza ngenkuthalo indibaniselwano yebhayoloji, ivala umsantsa phakathi kokufakelwa kwezinto ezenziweyo kunye nezicubu eziphilayo zendalo.

• Inkangeleko yoKhuseleko olungeyotyhefu: Ngokungafaniyo nezinye ii-agent zeekhemikhali ezisetyenziswa kwizinto zokuthambisa kunye nokunakekelwa kwamazinyo, ayinayo ityhefu ngokupheleleyo. Ukuba iginywe (inkxalabo eqhelekileyo kunye nentlama yamazinyo yabantwana), ivele inyibilike ibe yi-calcium engenabungozi kunye ne-phosphate ions kwi-asidi yesisu.

• Ukuhlaziywa ngokuthe ngqo: Ngelixa ezinye iindlela zonyango zithintela ukuchithwa kwe-demineralization, i-hydroxyapatite ivuselela izicubu ngokunikezela ngokuthe ngqo kwiiminerali ezichanekileyo amazinyo kunye namathambo afuna ukuzilungisa.

Iprofayile yeDatha yobuGcisa

Ukwenziwa kweekhemisti kunye nabaphathi bokuthengwa kwempahla, ingcaciso echanekileyo ibalulekile. Nangona i-custom synthesis ihlala ikhethiweyo, umgangatho ophezulu we-Medical/Oral Grade hydroxyapatite powder kufuneka ulungelelanise ngokubanzi kunye neeparitha zobuchwepheshe ezilandelayo:

• Imbonakalo: Umgubo ococekileyo, omhlophe, ongenavumba

• Ulwakhiwo lweCrystal: Inkqubo yeHexagonal

• Ifomula yemichiza: $Ca_{10}(PO_{4})_{6}(OH)_{2}$

• I-Ca/P Molar ratio: 1.66 - 1.68 (Ithiyori ekujoliswe kuyo 1.67)

• Ubunyulu / Isivavanyi: ≥ 99.0%

• Ubungakanani besuntswana (D50): * IBanga leNano: 20 nm – 60 nm

  • Ibakala eliNcinci: 1 μm - 10 μm

• Ixabiso le-pH (i-5% yokunqunyanyiswa kwamanzi): 6.5 – 8.0

• Ilahleko ekomisweni: ≤ 2.0%

• Imida yeentsimbi ezinzima:

  • Inkokeli (Pb): < 1.0 ppm

  • IArsenic (As): <1.0 ppm

  • IMercury (Hg): <0.1 ppm

  • I-Cadmium (Cd): <0.5 ppm

FAQ: Imibuzo ebuzwa rhoqo

I-Q1: I-hydroxyapatite ithelekisa njani ne-fluoride kwi-toothpaste?

Ngelixa zombini zithintela imingxuma, iindlela zazo zahluke ngokupheleleyo. I-Fluoride isebenzisana namathe ukwenza umqobo kwindawo yezinyo ebizwa ngokuba yi-fluorapatite, ekwaziyo ukumelana nokuhlaselwa kwe-asidi. I-Hydroxyapatite, ngakolunye uhlangothi, isebenza njengento yokutshintsha ngokuthe ngqo. Izalisa ngokwasemzimbeni kwimingxuma encinci kunye neeminerali ezilahlekileyo kwi-enamel. Iindlela ezininzi zale mihla ngoku zidibanisa zombini ukhuseleko oluphezulu, nangona i-hydroxyapatite ithandwa kakhulu ngabo bafuna iinketho ezingenayo i-fluoride.

I-Q2: Ngaba i-nano-hydroxyapatite ikhuselekile ukusebenzisa imihla ngemihla? Ngaba iya kungena egazini lam?

Ewe, ithathwa njengekhuselekile ngokubanzi ngamaqumrhu alawulayo ehlabathi ukuba asetyenziswe yonke imihla kwizinto zokuthambisa kunye nokhathalelo lomlomo. Ngelixa iinqununu ziyi-nano-size, zixhomekeke kakhulu kwi-agglomeration (i-clumping ndawonye) ekuqulunqweni. Ngaphezu koko, ukuba ifakwe ngengozi, i-nano-particles i-soluble kakhulu kwiindawo ezine-acidic. Baqhekeza ngokukhawuleza kwi-asidi yesisu kwi-calcium esisiseko yokutya kunye ne-phosphorus, ukuthintela nayiphi na ingozi yetyhefu yeselula okanye ukuqokelela kwamalungu.

I-Q3: Ngaba i-hydroxyapatite ingaba mhlophe ngokwenene amazinyo?

Ewe, kodwa akunjalo ngendlela efanayo neperoxide. Iibleaches zeMichiza zikhupha amabala ngaphakathi kwisakhiwo sezinyo. I-Hydroxyapatite isebenza njengokubuyisela umzimba. Ngokuzalisa i-micro-abrasions kunye namabala arhabaxa kwi-enamel surface, yenza ukuba izinyo libonise kakhulu kwaye ligudileyo. Oku kubonakaliswa kokukhanya kwandisiweyo kunika inkangeleko ebonakalayo yoncumo oluqaqambileyo, olumhlophe, nolusempilweni ngaphandle kobuthathaka bemithambo-luvo edla ngokubangelwa kukuphuma kwemichiza.