1. Efficient root canal treatment: N2 method;Sargenti,1978
2. Efficient root canal treatment: N2 method;Sargenti,1978
3. Efficient root canal treatment: N2 method;Sargenti,1978
4. Efficient root canal treatment: N2 method;Sargenti,1978
5. Efficient root canal treatment: N2 method;Sargenti,1978