A comparative study of gold UCLA-type and CAD/CAM titanium implant abutments

Abstract

PURPOSE. The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments. MATERIALS AND METHODS. An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to milled titanium abutment and the rest were connected to the gold-cast UCLA abutments. The implant fixture and abutment were tightened to torque of 35 Ncm using a digital torque gauge, and initial detorque values were measured 10 minutes after tightening. To mimic the mastication, a cyclic loading was applied at 14 Hz for one million cycles, with the stress amplitude range being within 0 N to 100 N. After the cyclic loading, detorque values were measured again. The fixture-abutment gaps were measured under a microscope and recorded with an accuracy of ±0.1 μm at 50 points. RESULTS. Initial detorque values of milled abutment were significantly higher than those of cast abutment (P<.05). Detorque values after one million dynamic cyclic loadings were not significantly different (P>.05). After cyclic loading, detorque values of cast abutment increased, but those of milled abutment decreased (P<.05). There was no significant difference of gap dimension between the milled abutment group and the cast abutment group after cyclic loading. CONCLUSION. In conclusion, CAD/CAM milled titanium abutment can be fabricated with sufficient accuracy to permit screw joint stability between abutment and fixture comparable to that of the traditional gold cast UCLA abutment.

Effects of cleaning methods for custom abutment surfaces on gene expression of human gingival fibroblasts

“…Because of their broad range of applications, customized implant abutments obtained by using computer-aided design and computer-aided manufacturing (CAD/CAM) techniques are now common. Titanium is the most widely used abutment material and has been very successful in long-term clinical practice (12). Yttrium-stabilized zirconia is used as an alternative material for implant abutments.…”

Accuracy of Original vs. Non‐Original Abutments Using Various Connection Geometries for Single Unit Restorations: A Systematic Review

“…1,7,9,10,[33][34][35][36][37][38][39][40] Three studies connected NOAs onto implants with both kinds of connection (internal and external). [41][42][43]…”

Vor- und Nachteile bei der Verwendung von individuellen Abutments

“…Die Fortentwicklung hat sich dementsprechend auf Basis von 2 unterschiedlichen Konzepten gebildet. Zum einen werden individuelle CAD/CAMAbutments angeboten, die eine hohe Passung, teilweise sogar eine Freigabe des origi nären Implantatherstellers für das jeweilige Fräs zentrum zeigen [9]. Oder es werden Aufbaubasen zur Verfügung gestellt, auf die eine individuelle Aufbaukonfiguration mittels Verklebung oder ei ner Presstechnik aufgebracht werden kann [10].…”