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ePaper created 2016-09-05, 09:33:59 | version 1.38.0
non-surgical treatment study | 31 roots 3 2016 30–50 years had nearly 2-fold and the age group of over 50 years a 3.1-fold higher extraction risk versus the patients under the age of 30. Analysisrevealedsignificantdifferences(< 0.0001) regarding failures connected with the kind of tooth: molars18.2 %,premolars8.8 %,frontteeth8.1 %.Ex- traction rate of upper incisors was the lowest, ex- tractionrateofthelowerincisorsthehighest.Details can be seen in Table 4. According to univariate analy- sis,ageandkindoftoothwerenotrelevantregarding failure. Considering all analysed influence factors, premolarshadalowerextractionriskof81.5 %versus front teeth, molars a lower extraction risk of 73.1 %. Aside from 19 teeth (0.23 %), all vital teeth were treated in one appointment. The multi-appointment ofnon-vitalteethin257cases(47 %)ledtomorefail- ures (p = 0.0496). Significant failure rate differences could be ob- servedregardingpulpvitalitypriortoRCT(p<0.001). Coxregressionshowedthesignificantlylowerfailure risk for vital teeth, which amounted to 30.9 % of non-vital teeth. Twohundredandfifty-six(46.9 %)ofthenon-vital teeth featured an apical lesion when starting RCT. These were diagnosed with a failure rate of 34.9 % Case 1 Figs.5a & b: Pre-op X-ray (a).Post-op X-ray with fistulation drill (b). Figs.6a & b: Fistulation drill in situ (a). Post fistulation (b). Fig.7: Control X-ray – 5 years after treatment. Teeth At Risk P At Risk P n n 12,11,21,22 346 <0.0001 321 0.0115 13.23 242 0.547 205 <0.0001 14,15,24,25 478 0.8100 445 0.0356 16,17,18,26,27,28 372 0.0584 355 <0.0001 32,31,41,42 68 0.0131 59 0.0081 33.43 200 0.0066 190 0.0058 34,35,44,45 591 0.8100 562 <0.0001 36,37,38,46,47,48 362 0.134 341 <0.0001 36.46 174 0.813 160 <0.0001 37.47 163 0.197 157 0.0175 Extraction Failure Survival (CI) Survival (CI) % % 81,9 (78,9-85,1) 90,9 (88,6-93,2) 71,8 (67,7-76,2) 93,6 (91,2-96,1) 72,3 (69,3-75,4) 90,1 (88,0-92,2) 72,3 (69,1-75,7) 85,4 (82,8-88,0) 63,1 (55,6-71,5) 82,5 (76,5-89,1) 69,3 (64,8-74,1) 93,6 (91,2-96,1) 74,6 (72,0-77,4) 92,2 (90,5-93,9) 70.9 (67,7-74,4) 78,3 (75,3-81,5) 72,2 (67,6-77,0) 72,7 (68,2-77,5) 69,7 (64,7-75,0) 84,7 (80,7-88,9) Table 4: Survival probability of teeth-groups 10 years after root-canal-treatment (p-value compared to the totality of all other teeth). Fig.5a Fig.6a Fig.6b Fig.7 Fig.5b 32016 12,11,21,22346 <0.00013210.0115 13.232420.547205 <0.0001 14,15,24,254780.81004450.0356 16,17,18,26,27,283720.0584355 <0.0001 32,31,41,42680.0131590.0081 33.432000.00661900.0058 34,35,44,455910.8100562 <0.0001 36,37,38,46,47,483620.134341 <0.0001 36.461740.813160 <0.0001 37.471630.1971570.0175