![]() For the group using bite impression coping, however, bite impression copings (Pick Cap Impression Kit, Neobiotech, Seoul, Korea) were connected to the implant fixtures of the reference model and impressions were then taken with bite trays (Dentian bite tray, Seilglobal, Busan, Korea) and polyvinyl siloxane impression material (Delikit Heavy Body, HappiDen, Seoul, Korea) ( Fig. The impressions were then taken with individual trays (Trayplast NF, Vertex Dental BV, Zeist, Netherlands) and polyvinyl siloxane impression material (Delikit Heavy Body, Happi Den, Seoul, Korea). All coronal parts of the healing (5 mm) and temporary abutments were revealed supragingivally because the fixtures were placed equigingivally. For the experimental groups, impression copings were connected to the implant fixtures of the reference model. All impression taking, cast fabrication, and bite registration processes were conducted by one operator according to the manufacturer's instructions to reduce the errors. ![]() This cast was established as the reference model ( Fig. The prepared cast was occluded and mounted on the semi-adjustable articulator (Hanau Modular Articulator System, Whip Mix, Louisville, KY, USA). The implant platforms were located on the gingival level. At the second premolar site, a 4.0 mm × 7.3 mm fixture (ISII Fixture, Neobiotech, Seoul, Korea) was installed, and 5.0 mm × 7.3 mm fixtures were installed in the first and second molar sites. ![]() The mandibular right second premolar, first molar, and second molar of the cast were removed up to approximately 5 mm inferior to the interproximal gingival margin to form a slightly resorbed residual ridge. ![]() The cast of an adult patient with normal occlusion was duplicated to prepare polyurethane maxillary and mandibular casts. Therefore, this study evaluated the accuracy of various bite registration methods using a three dimensional digital measurement method for implant-supported fixed prostheses. Moreover, the accuracy of bite impression copings for implant prostheses, which were introduced recently, has not been fully reviewed. 8, 9, 10, 11 On the other hand, few studies have been conducted on bite registration techniques for implant-supported fixed prostheses. Recently, a bite impression-taking method was developed allowing simultaneous impression-taking and bite registration for implant-supported fixed prostheses, and various studies have been actively pursued on the properties and accuracies of bite registration materials. 7 reported various methods using healing abutments, planning abutments, and impression copings according to the size of the interocclusal space. 6 reported the method using healing abutments, and Monzavi et al. Savabi and Nejatidanesh 5 reported a bite registration method using impression copings. Implant-supported fixed prostheses are becoming increasingly common therefore, various clinical procedures have been attempted using implant components for transferring the interocclusal relationship to the final cast. Iatrogenic errors caused by bite registration materials can be controlled by skilled clinicians who have a deep understanding of the procedures, appropriate materials and methods. 2, 3 The factors that may cause errors during the bite registration process include anatomical complexities, physiological factors, and material properties. 1, 2 Previous studies evaluated the accuracy of these processes 2, 3, 4 and reported that errors must be minimized during the bite registration process to reproduce the accurate interocclusal relationship on the articulator. To fabricate successful prostheses, it is important to reproduce the interocclusal relationship accurately and transfer it to the articulator.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |