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Prosthetic screw detorque values in implants retained as cast bar superstructures or bars modified by the Cresco Ti Precision technique--a comparative in vivo study.

PURPOSE: This prospective clinical trial investigated the effect of different fabrication techniques on screw-joint stability in implant-retained frameworks. MATERIALS AND METHODS: Seventy-nine dental implants (39 Brånemark System and 40 Straumann) were inserted into 20 patients with an edentulous m...

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Published in:International Journal of Prosthodontics Vol. 22; no. 2; pp. 193 - 201
Main Authors: Schmitt J, Holst S, Eitner S, Schlegel A, Wichmann M, Hamel J
Format: research Journal Article
Published: Quintessence Publishing Company Inc. 2009
Online Access:View this record in EBSCOhost
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        08932174
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      jtl: International Journal of Prosthodontics
      issn: 08932174
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      dt: 2009
      vid: 22
      iid: 2
      pid: 1935
      pub: Quintessence Publishing Company Inc.
      place: Batavia, Illinois
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        105523563
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        atl: Prosthetic screw detorque values in implants retained as cast bar superstructures or bars modified by the Cresco Ti Precision technique--a comparative in vivo study.
      aug:
        au:
          Schmitt J
          Holst S
          Eitner S
          Schlegel A
          Wichmann M
          Hamel J
        affil: Department of Prosthodontics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany. johannes.schmitt@uk-erlangen.de
      sug:
        subj:
          Dental Prosthesis Equipment and Supplies
          Dental Prosthesis, Implant-Supported
          Prosthesis Design
          Clinical Trials
          Dental Casting Technique
          Dental Implantation
          Dentistry
          Equipment Design
          Jaw, Edentulous Rehabilitation
          Mandible Surgery
          Prospective Studies
          Torque
          Human
      ab: PURPOSE: This prospective clinical trial investigated the effect of different fabrication techniques on screw-joint stability in implant-retained frameworks. MATERIALS AND METHODS: Seventy-nine dental implants (39 Brånemark System and 40 Straumann) were inserted into 20 patients with an edentulous mandible. One of two fabrication techniques was randomly chosen as a definitive restoration, either a cast bar or a bar superstructure modified with the Cresco Ti Precision (CTiP) technique. The patients were divided into four groups depending on the type of implant and prosthetic superstructure: Straumann-conventional (Sc), Straumann-Cresco (SCr), Brånemark-conventional (Bc), and Brånemark-Cresco (BCr). Initial torque values and removal torque values were recorded with a custom-made digital torque controller both 1 week (T1) and 3 months (T2) after clinical function. RESULTS: Statistical analysis revealed significant differences in absolute detorque values at T1 (P = .002) with 4.51 Ncm (SD = 3.80) for the Sc group, 10.65 Ncm (SD = 4.42) for SCr, 11.24 Ncm (SD = 4.00) for Bc, and 9.02 Ncm (SD = 3.81) for BCr. At T2 (P = .000) the median values of lost torque were 5.08 Ncm (SD = 4.05) for the Sc group, 10.51 (SD = 3.00) for SCr, 7.50 (SD = 5.86) for Bc, and 9.41 Ncm (SD = 4.54) for BCr. However, when correlation of detorque values to initial torque values was performed, no statistical differences were found between groups or time points. The percentage of lost torque at T1 (P = .849) and T2 (P = .058) was 28.60% (SD = 21.80) and 32.85% (SD = 24.65), 30.04% (SD = 12.49) and 30.80% (SD = 8.66), 32.11% (SD = 11.37) and 21.03% (SD = 16.53), and 25.33% (SD = 10.69) and 27.83% (SD = 12.57) for the Sc, SCr, Bc, and BCr groups, respectively. CONCLUSIONS: The screw-joint stability of passivated bars is not superior to cast superstructures. A general decrease of approximately 30% of initial torque values can be expected in clinical situations, independent of the implant system used.
      pubtype: Academic Journal
      doctype:
        research
        Journal Article
      ougenre: Article
    language: English
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