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ePaper created 2017-09-12, 09:26:18 | version 1.38.0
| study treatments of teeth with open apical foramen Fig. 5a Fig. 5b Fig. 5c Case 3: Female (born 8 August 1988): Tooth 11 Fig. 5a: 4 September 1995 ante RCF (non-vital). Fig. 5b: 4 September 1995 post RCF. Fig. 5c: 22 April 2002 status. served on the basis of the 49 cases with multiple fol- low-up X-rays in different intervals. A first follow-up X-ray was available after an average of 34.6 months (4–130). 18 cases (36.7 %) featured advancement, whereas the status of the other cases remained un- changed. Not considering the nine partial successes as men- tioned above, an apexification success rate with/ without root lengthening of 90 % (confidence inter- val 80.7–99.3 %) was determined in the VitE group, the success rate of the VitA group was 85.7 % (confi- dence interval 72.7–98.7 %), the non-vital group showed a success rate of 57.1 % (confidence interval 20.5–93.8 %). The percentaged difference of apexifi- cation success VitE versus VitA with a probability of error of p = 0.5893 and VitA versus non-vital group with p = 0.0910 was not significant statistically. A sta- tistic significance could be determined when com- paring VitE with the non-vital group (p = 0.0243). Apexification success in root-filled teeth proved not to be depending on the filling level (p = 0.2441). Ten endodontic failures (13.3 %), nine of which radio- graphically and one clinically due to fistula formation (see case 2), were observed: six following VitE (15 %), two following VitA (7,1 %) and two following con- servative root canal treatment of the seven non-vital teeth (28,6 %). Regarding endodontic success/failure of VitE versus non-vital group, a statistic significance revealed (p = 0.0587). A statistic significance could be stated when comparing VitA with the non-vital group (p = 0.0157). Apexification occurred in nine of the ten failures. Patient classification in age groups of younger than 125 months and older than 125 months was not relevant regarding avoidance of endodontic failure (p = 0.448). 19 teeth (20 % of the 95 treated teeth) were extracted during the observation period. Seven of these teeth belonged to the VitE group, eight to the VitA group and four to the non-vital group. A statistic sig- nificance of extraction frequency existed when com- paring the VitE with the non-vital cases (p = 0.0169). Figure 1 shows the three groups’ probability of sur- vival with the aim of no extraction. Nine teeth (47 %) were extracted within the first 50 months after treatment. The time history of all extractions is featured in Figure 2. Main reason for extraction was damage/fracture of the natural tooth crown (42 %) or an endodontic failure (31 %). 33 of the 48 endodontic treatments of first lower molars had been done prior to the age of ten years. 14 first lower molars (73.7 % of all extractions) were ex- tracted, 12 of which prior to the age of 20 years. Discussion The present study is a retrospective one with data collected out of a regular dental practice, where endodontic treatments were done according to the Sargenti N2 technique (1954) exclusively, a method not accepted in the established dental doctrine, primarily due to the formaldehyde content in the N2 powder, but also because of elimination of root canal rinsing. 95 cases could be evaluated. Whereas apexification literature is generally based on front teeth with necrotic pulp, only 10 % of the 12 roots 3 2017