Table 4.

The bivariate (chi-square) and logistic regression analyses for survival/extraction. Statistically significant variables according to the bivariate chi-square (*) analysis were included in the logistic regression analysis. Significant risk indicators are expressed as odds ratio (OR) (*). B: logistic regression coefficient (the exponentiation of the B coefficient, EXP(B), is the odds ratio). Comparisons of survival distributions according to the significant risk indicators were performed using the log-rank test (significant differences are expressed as **). The level of significance was set at p < 0.005.

	Chi-square	p value (chi-square)	B (logarithm of the OR)	p value (logistic regression)	OR EXP(B)	95% CI for OR (lower)	95% CI for OR (upper)	Log-rank test
Age	3.692	0.055
Gender	0.247	0.619
Dental arch	0.015	0.204
Diagnosis of bruxism	2.303	0.129
Use of night guard	8.061	0.005*	−1.088	0.023*	0.337	0.132	0.860	0.036**
Pulp status	0.773	0.379
Radiographic radiolucency	9.210	0.002*	0.628	0.028*	1.874	1.071	3.277	< 0.001**
Radiographic healing	1.229	0.268
Fiber_post	10.526	0.001*	−0.756	0.026*	0.469	0.242	0.912	0.425
Cast Metal_post	27.782	0.000*	0.759	0.018*	2.137	1.137	4.015	0.082
PPD < 5 mm	18.411	0.000*	-0.387	0.001*	0.679	0.538	0.858	< 0.001**
Single unit crown	1.805	0.179
Dental bridge	18.307	0.000*	0.400	0.766	1.492	0.107	20.777
Dental bridge with extension	1.720	0.190
Dental bridge without extension	16.948	0.000*	0.239	0.855	1.271	0.097	16.726
No adjacent tooth	11.000	0.001*	0.289	0.403	1.334	0.678	2.625
Adjacent natural tooth	7.007	0.008*	0.079	0.846	1.082	0.488	2.402
Adjacent crown or bridge	0.640	0.424
No antagonist	3.348	0.067
Antagonist natural tooth	10.762	0.001*	−0.428	0.128	1.082	0.488	2.402
Antagonist crown or bridge	0.875	0.675