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Advanced Implant Prosthodontics |Complete guide: Preventing Implant Screw IssuesYOUTUBE VIEWING ONLY скачать в хорошем качестве

Advanced Implant Prosthodontics |Complete guide: Preventing Implant Screw IssuesYOUTUBE VIEWING ONLY 2 года назад

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Advanced Implant Prosthodontics |Complete guide: Preventing Implant Screw IssuesYOUTUBE VIEWING ONLY
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Advanced Implant Prosthodontics |Complete guide: Preventing Implant Screw IssuesYOUTUBE VIEWING ONLY

YOUTUBE EDUCATION : #71 MASTERCLASS PRO-SERIES: ADVANCED LEVEL DENTISTS The replacement of a patient’s missing teeth in modern dentistry by using appropriately integrated dental implant systems is both emotionally satisfying and sensational. General dentists, specialists and patients desire the best possible outcome and performance. An implant system comprises of an implant body/ fixture, the abutment-prosthesis complex and these components are clamped together utilizing an abutment screw, which creates and maintains a joint compression. In a regular dentition without any implants, the maximal vertical (axial) biting forces approximate 800 N and lateral forces circa 20 N, consequently implant systems are required to withstand and thwart these forces. The performance of the abutment screw in maintaining joint compression is vulnerable and dependant on the implant system connection (internal hex, external hex, Morse taper) In external hexed implant systems, the abutment screw is the weakest link in the implant-abutment-prosthesis complex and a common problem associated with the prosthetic function of dental implants is loosening and fracturing of abutment screws. Regardless of the implant attachment system the common complication of abutment screw loosening and fracture, reported extensively in the literature, plagues both clinicians and patients at inopportune times and circumstances. Despite decades of engineering improvements to abutment screws this author continues to frequently encounter patients with this complication in daily implant clinic referral. Abutment screws differ inter alia in their shape; size, physiognomy, roughness, and chemical composition yet are primarily manufactured from titanium alloy and gold alloy. Chemical composition determines a materials Brinell harness (a definition of hardness in material science) and ultimate strength (also called tensile strength) Historically, gold alloy abutment screws were preeminent, however, in more recent years titanium alloy screws are more routine. We scrutinize: 1- frequency of abutment screw loosening and fracture 2- root causes of this complication. 3- clinical suggestion to reduce screw loosening and 4- the superior alloy in the Implant-abutment-screw prosthesis complex The purpose of this study is to correlate screw loosening and contrast gold alloy and titanium alloy abutment screws. We detail clinical advice in diminishing abutment screw loosening as this complication brings about costly and grim obstacles We analyse factors responsible for abutment screw loss and fracture quantifies this complication along with prevention, including scrutinization regarding the chemical composition in abutment screw alloys. Topics : Clamping force, Torque, Preload, Excessive bending, Settling effect/ Embedment relaxation, Wet lubricants, Abutment screw coating / Dry lubricants, Metal fatigue, Clockwise and Counter-Clockwise moments, Consecutive loosening and retightening, External hexagon & Internal hexagon (Flat connection) Types and Micro-gap formation, Conical connection types and Micro-gap formation, Abutment screw alloy composition and tensile strength, Galling, Number of abutment screw threads, Number of implants and diameter, Prosthetic design and occlusal table, abutment and screw head interface, Screw head and body design, Abutment screw flanks connection with the implant internal thread flanks, follow-up period, number of patients, total number of screws, number of failures, success, type of screw, type of abutment, type of study, type of connection, screw brand, number of loose screws, number of fractured screws, type of alloy, chemical composition, rate of tightening 10, 20, 25, 30, 32, 35, 40 Ncm (and re-torqued after 10 min.) The factors responsible for screw loosening and screw fracture, the chemical composition of abutment screw alloys with the frequency of abutment screw loosening and fracture. 221 articles results depict abutment screw loosening & fractures are common complications, the incidence is not improving, and this dilemma increases over the lifespan of abutment screws. We detected many implant design improvements; however, a multitude of manufacturers not divulging the chemical composition of their abutment screw alloys. Gold alloy abutment screws influenced by lubrication, appropriately torqued sequenced connections, create a superior preload at the implant-abutment connection with appropriate prosthetic restorative protocols and qualify for reduced abutment screw loosening Data confirms abutment screw complications are common, may diminish with appropriate use of protocols combining essential re-torqueing in conjunction with gold alloy abutment screws Keywords: Abutment screws, dental implants, fracture, gold screws, implant complications, loosening, preload, screws, screw preload. Short video 1 :    • QED 71: 7 Best steps to preventing abutmen...   Short video 2:    • General clinical recommendations to preven...  

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