IM0310

32 I I study _ design and surfaces implants3_2010 Placing implants in poor quality bone in poste- rior areas and sites with complications increase theriskfailurerate.Itisevenmorecrucialwhenthe bone is not able to provide initial stability for im- plantsorifthepreparationhasafracturedwallon one side or more. No considerable difference was noticed in the success rate when the implant placement was combined with bone grafting or bone grafting with sinus lifting. Implant sites must therefore be evaluated prior to surgery and high risk sites should be bone graftedpriortoinsertingtheimplantinordertore- ducetheoccurrenceofearlyandlatefailures.Nat- urallyshouldthenecessityarise,thesurgeonmust beskilledinallthedifferentprocedures.Onefixture thatwasconsideredsuccessfulduringStageIIwas found to be mobile during abutment connection. This raises the the theory that in poor bone quality, opening and tightening of the healing screw can damage newly formed bone which will conse- quently resorb and lead to implant mobility. Thestudydidnotfindanystatisticalcorrelation between the success rates of different procedures to the types of implants used._ _References 1. A comparison of hydroxyapatite (HA) – Coated threaded, HA – coated cylindric, and titanium threaded endosseous dental implantsd. Jeffcoat MK, et al. Int J Oral Maxillofac Implants. 2003 May-Jun;18(3):406–10. 2. A comparison of hydroxyapatite-coated Micro-Vent and pure titanium Swede-Vent implants. Evian CI. Int J Oral Maxillofac Implants. 1996 Sep-Oct;11(5):639–44. 3. A 5-year comparison of hydroxyapatite-coated titanium plasma-sprayed and titanium plasma-sprayed cylinder dental implants. Jones JD, et al.Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1999 Jun;87(6):649–52. 4. Immediate or early placement of implants following tooth extraction: review of biologic basis, clinical procedures, and outcomes. Chen ST,Wilson TG Jr, Hämmerle CH. Int J Oral Maxillofac Implants. 2004;19 Suppl:12–25. 5. Survival of immediately provisionalized dental implants placed immediately into fresh extraction sockets. Schwartz-Arad D, Laviv A, Levin L. J Periodontol. 2007 Feb;78(2):219–23. 6. Placment of hydroxyapatite-coated implants into fresh or recent extraction sites.RaymondAY.Dental Clinics of North America. 1992; Jan;36(1):97–115. 7. Implant zones of the jaws: implant location and related suc- cessrate.TolstunovL.JOralImplantol.2007;33(4):211–20. Distribution of implant placement combined with bone grafting or sinus lift SelfThread TPS SmoothFit HA Smooth FitTotal Bone graft 26 9 1 46 Sinus lift 6 22 7 35 Total 32 31 18 81 Distribution of implants placed in immediate extraction site SelfThread TPS Smooth Fit HA Smooth Fit 16 4 0 Distribution of failed implant with regard to jaw,sex & location JawType Female Male Posterior Anterior Maxilla 2 0 2 0 Mandible 2 1 1 2 Total 4 1 3 2 Distribution of lengths of failed implants 10 mm 12 mm 16 mm Total TPS Smooth Fit 3.5 0 0 0 0 HA Smooth Fit 3.5 0 0 0 0 SelfThread 3.75 1 3 0 4 SelfThread 5.00 1 0 0 1 Total 2 3 0 5 Dr Roy Leshem DMD 1 Maskitstreet Herzlia,Israel E-mail:hitecimp@netvision.net.il 1 Privitepractice,Herzlia,Israel 2 Headof Pediatric&CraniofacialPlasticSurgery, TheTelAvivSouraskyMedicalCenter,Israel. _contact implants Tab. 6 Tab. 7 Tab. 8 Tab. 5