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ePaper created 2016-09-05, 09:33:59 | version 1.38.0
| study non-surgical treatment 28 roots 3 2016 Log Rank test. A p-value of < 0.05 was judged as be- ingsignificantstatistically.Survivalpublicationsde- pendingon14influencefactors(Table1)inreference to failure and extraction were determined with the help of the multiple Cox regression (Table 2). This in- clude the findings which were relevant in vital and non-vital cases. Results The observation period of the 8,644 analysed teeth lasted up to 25 years after the RCT (median 6 years). 8,098 (93.7 %) were attributed to vital extirpations (VitE) and 546 (6.3 %) to conservative initial treat- ment of non-vital teeth. During the observation pe- Variable Sub-Group p-Value HR CI p-Value HR CI Operator 0.013 1,210 1.041-1.41 Insurance (RVO reference) VDAK <0.001 0.767 0.69-0.85 Private <0.001 0.759 0.65-0.88 Age ( <30 reference) 30-50 <0.001 1,874 1.66-2.11 >50 <0.001 3,123 2.75-3.55 Tooth-type (front reference) premolar 0.001 0.815 0.73-0.91 molar <0.001 0.731 0.64-0.84 Pulp preop. <0.001 0.309 0.25-0.38 r.c. filling (short reference) length flush 0.099 0.914 0.82-1.02 <0.001 0.636 0.52-0.77 long 0.026 0.818 0.69-0.96 <0.001 1,758 1.41-2.20 r.c. filling 0.004 1,160 1.05-1.28 <0.001 2,081 1.78-2.43 quality Restoration (filling reference) crown <0.001 0.310 0.20-0.35 <0.001 0.428 0.35-0.52 crown+ post <0.001 0.316 0.26-0,39 0.030 0.720 0.53-097 Failure <0.001 2,794 2.49-3.14 Breakage 0.006 1,324 1.08-1.62 <0.001 2,179 1.70-2.79 canal instr. Via falsa <0.001 2,533 1.60-4.01 <0.001 8,370 5.05-13.88 r CI = Confidence Interval Factors are compared with the reference group based on value 1. Hazard Ratio >1: the evaluated factor has a greater risk of a negative result e Hazard Ratio <1: the evatuated facto factor is l ss prone to a negative result Extraction Failure Table 2: Cox-Regression based on univariat significant factors. Fig.1: Related to failure survival probability:length of root-canal filling. Fig.2: Survival probability (extraction): quality of root-canal filling. Fig.1 Fig.2 32016 Operator 0.0131,2101.041-1.41 VDAK <0.0010.7670.69-0.85 Private <0.0010.7590.65-0.88 30-50 <0.0011,8741.66-2.11 >50 <0.0013,1232.75-3.55 premolar 0.0010.8150.73-0.91 molar <0.0010.7310.64-0.84 Pulp preop. <0.0010.3090.25-0.38 length flush 0.0990.9140.82-1.02 <0.0010.6360.52-0.77 long 0.0260.8180.69-0.96 <0.0011,7581.41-2.20 r.c. filling 0.0041,1601.05-1.28 <0.0012,0811.78-2.43 crown <0.0010.3100.20-0.35 <0.0010.4280.35-0.52 crown+ post <0.0010.3160.26-0,390.0300.7200.53-097 Failure <0.0012,7942.49-3.14 Breakage 0.0061,3241.08-1.62 <0.0012,1791.70-2.79 Via falsa <0.0012,5331.60-4.01 <0.0018,3705.05-13.88