Wir verwenden Cookies, um für diese Website Funktionen wie z.B. Login, einen Warenkorb oder die Sprachwahl zu ermöglichen. Weiterhin nutzen wir für anonymisierte, statistische Auswertungen der Nutzung Google Analytics, welches Cookies setzt. Mehr Informationen finden Sie in unserer Datenschutzerklärung.
OK, ich bin einverstanden Ich möchte keine Google Analytics-Cookies
International Poster Journal of Dentistry and Oral Medicine



Kennwort vergessen?


Int Poster J Dent Oral Med 3 (2001), Nr. 1     15. Mär. 2001

Int Poster J Dent Oral Med 2001, Vol 3 No 1, Poster 62

Evidence for healing of intrabony and furcation defects after periodontal therapy: digital subtraction and bone measurements

Language: English

Author(s): Peter Eickholz, Ti-Sun Kim, Ernest Hausmann
Dept. of Operative Dentistry & Periodontology, University of Heidelberg, Germany; Computer Analysis Plus, Amherst, NY & Dept. of Oral Biology, SUNY Buffalo, NY, USA

86th annual meeting of the American Academy of Periodontology
Honolulu, Hawaii, USA


Comparison of digital subtraction analysis to the gold standard of intrasurgical measurements 5 years after periodontal surgery of intrabony and furcation defects.

Material and Methods


  • 13 patients (8 female) 32 - 64 years of age.
  • Untreated advanced periodontal disease.
  • Each exhibiting at least one interproximal intrabony and/or class II/III furcation defect.

Radiographic examinations

  • Standardized bitewing radiographs of teeth with intrabony/class II/III furcation defects using modified film holders (VIP 2 Film Positioning, UpRad Corp., Fort Lauderdale, FL, USA) (Fig. 1, 2) at baseline, 6, and 60+3 months after surgery. Two orthodontic wires were placed on the mandibular side of the filmholder at a specified position (Fig. 1). Shadows of these wires were cast onto the radiographs. From the distances between the images of these wires on a radiograph, the vertical and horizontal angulation difference between the consecutive radiographs could be calculated.
  • Intraoral dental films (Ultraspeed, Eastman Kodak Co., Rochester, NY, USA) size 2.
  • x-ray source (Heliodent 70, 70 kV, 7 mA, Siemens, Bensheim, Germany).
  • Development unit (Periomat, Dürr Dental GmbH, Bietigheim-Bissingen, Germany).

Clinical examinations
At 6 sites per tooth (baseline, 6, 60+3 months after surgery):

  • Gingival Index (GI) and Plaque Index (PlI).
  • PD and CAL-V to the nearest 0.5 mm (PCPUNC 15).
  • CAL-H to the nearest 0.5 mm in class II furcations (PQ2N).

Periodontal surgery

  • Mucoperiosteal flap, thorough debridement alone in 5 defects and GTR in 25 defects using ePTFE (14 defects) and Polyglactin 910 (11 defects) barriers.
  • Removal of ePTFE barrier after 4 to 6 weeks.

Bone measurements
After reflection of a full thickness flap and under local anaesthesia 60+3 months after surgery:

  • Distance cemento-enamel junction (CEJ) to the most apical extension of the bony defect (BD): PBL-V.
  • Horizontal probing bone level in class II furcations: PBL-H.

Radiographic evaluation
Measurements using a loupe of 10 fold magnification and a 0.1 mm grid (Scale loupe 10, Peak, Tohkai Sangyo, Tokyo, Japan):

  • Distances between the projections of the orthodontic wires that had been fixed to the filmholders vertically (dv) and horizontally (dh) on every radiograph.
  • Capturing of each radiograph with a CCD camera: Cohu Solid State Camera, Cohu Inc., San Diego, CA.
  • All radiographs were analysed by one examiner blinded to the clinical and intrasurgical measurements (EH).

Statistical analysis

  • Kolmogorov-Smirnov/Lilliefors-Test for normal distribution.
  • Comparison of baseline to 6 and 60 months postsurgical measurements by paired t test.
  • Stepwise multiple linear regression analysis:
    dependent variable: PBL-V, PBL-H
    explanatory variables: baseline PBL-V/-H, subtraction parameters, GTR therapy, patient.
  • Simple regression analysis:
    relative density loss/PBL-V, net area change/PBL-H


Discussion and Conclusions

  • Improvements achieved by periodontal surgery may be maintained stable up to 5 years.
  • Subtraction parameters suitably describe bony fill after periodontal therapy as evidenced by the gold standard of PBL measurements.


GI: Gingival Index
PlI: Plaque Index
PD: probing depth
CAL-V: vertical clinical attachment level
CAL-H: horizontal clinical attachment level
PBL-V: vertical probing bone level
PBL-H: horizontal probing bone level
SD: standard deviation
SSQ: sum of squares
MSQ: mean of squares
DF: degrees of freedom

This Poster was submitted on 29.01.01 by Dr. Peter Eickholz.

Correspondence address:
Dr. Peter Eickholz
Universität Heidelberg
Im Neuenheimer Feld 400
69120 Heidelberg