Implant failures: A broader perspective

Implant Failure - Prosthodontist’s Eye View

“…[14] Preimplant prosthodontic evaluation includes assessment of [10] Maxillary • Forces on implant -Implant and its component can sustain the forces which are directed along the long axis, but they cannot sustain the offaxial forces as they create stress at the implantbone interface. [15,16] • Cantilever -Restoration of completely edentulous arch with a cantilever fixed prosthesis, the length and width of the implant fixture, quality of the bone, number of implants, opposing occlusion, and anterior and posterior spread of implants must be considered. [15,16] • Tripod effect -Greater the tripod, more the resistance to bending, implants placed in a straight line in an edentulous arch, and minimal resistance to bending forces compared to those placed in a tripod.…”

“…[15,16] • Cantilever -Restoration of completely edentulous arch with a cantilever fixed prosthesis, the length and width of the implant fixture, quality of the bone, number of implants, opposing occlusion, and anterior and posterior spread of implants must be considered. [15,16] • Tripod effect -Greater the tripod, more the resistance to bending, implants placed in a straight line in an edentulous arch, and minimal resistance to bending forces compared to those placed in a tripod. • Occlusal load on the cantilever, fulcrum line is established in distal-most implant where cantilever is pushed toward the tissue surface and the anterior implants have tension occlusally, thus resulting in bending forces along the fulcrum.…”

“…• Occlusal load on the cantilever, fulcrum line is established in distal-most implant where cantilever is pushed toward the tissue surface and the anterior implants have tension occlusally, thus resulting in bending forces along the fulcrum. [16] Crown-implant ratio -1:1 ratio acceptable in full-arch restorations as they provide tripod effect. In partially edentulous conditions, 1:2 ratio is more preferable.…”

Peri-Implantitis: A Review of the Disease and Report of a Case Treated with Allograft to Achieve Bone Regeneration

“…Peri-implantitis exhibits crestal bone loss, 6,11,47,54,57 and moderate to advanced peri-implantitis is diagnosed by radiographs showing saucerization of bone loss around implant, loss of gingival attachment, probing depths greater than 4 mm, mobility of implant, bleeding and sup-puration. 59,60 A scale developed by James and Misch for classifies peri-implant disease on the basis of clinical symptoms and radiographic appearance ranging from optimum conditions to absolute failure. 23 The major diagnostic parameters considered in the classification include absence of pain, probing depth, rigid fixation, bleeding index, and radiographic evaluation of bone loss.…”

Prosthetic consideration in implant-supported prosthesis: A review of literature

“…[1] However, the more the number of teeth missing in a patient, it becomes more difficult to achieve this goal with traditional dentistry. Dental implantology is a term used today to describe anchoring of alloplastic material into the jaws to provide support and retention for prosthetic replacement of teeth that has been lost.…”