IADR Abstract Archives

Telescopic or Conical Double-Crowns: Clinical Risk Factors of Facing Split-off

Objectives: A frequent occurrence in removable partial dentures (RPD) is the splitting of resin facings of double crowns (DCs). As possible causes, the following potential clinical risk factors have been discussed: 1) type of construction (telescopic or conical crown), 2) type of antagonist reconstruction (full-, partial-, fixed-denture), 3) frequency of denture base fractures, 4) age group of patient, 5) gender, 6) type of luting agent, 7) number of abutment teeth, 8) number of replaced acrylic teeth, upper or lower jaw, or 9) type of Eichner-classification.

Methods: We studied the clinical records of 262 patients (141 women and 121 men) who had received 262 RPDs retained by 1,029 DC abutments at the Department of Prosthodontics of the University Hospital Regensburg between 1984 and 2007. All dentures were made according to a standardized protocol. Both drop-out patients (n=34) and 315 cover dentures were excluded from the original total of 611 patients. Out of the 262 prostheses included in our study, 200 were attached to telescopic crowns (TCs) and 62 to conical crowns (CCs). Statistics: Odds ratios were calculated and regression models were used to analyze potential clinical risk factors as described above.

Results: The risk of splitting facings was 3.28 times [CI: 1.89-5.68] higher in CCs than in TCs. The regression analysis showed that potential clinical risk factors were number of abutment teeth (most frequently patients with 4 or 5 abutment teeth) (p=0.04), jaw (p=0.03) and frequency of denture base fractures (p<0.000). No other discussed factor was statistically significant.

Conclusions: The splitting of resin facings seems to be a typical risk of conical double crowns.


Continental European, Israeli, Scandinavian Divisions Meeting
2009 Continental European, Israeli, Scandinavian Divisions Meeting (Munich, Germany)
Munich Germany
2009
41
Scientific Groups
  • Behr, Michael  ( University Medical Center Regensburg, Regensburg, N/A, Germany )
  • Kolbeck, C.  ( University Medical Center Regensburg, Regensburg, N/A, Germany )
  • Hahnel, S.  ( University Medical Center Regensburg, Regensburg, N/A, Germany )
  • Lang, R.  ( University Medical Center Regensburg, Regensburg, N/A, Germany )
  • Buergers, R  ( University Medical Center Regensburg, Regensburg, N/A, Germany )
  • Handel, G.  ( University Medical Center Regensburg, Regensburg, N/A, Germany )
    • Oral Session
    Prosthodontics & Craniofacial Development
    09/10/2009