Why Crown Down can be dangerous for the patient? – Discuss Dentistry https://demo.discussdentistry.com/forums/topic/why-crown-down-can-be-dangerous-patient/feed/ Wed, 19 Nov 2025 23:22:30 +0000 https://bbpress.org/?v=2.6.12 en-US https://demo.discussdentistry.com/forums/topic/why-crown-down-can-be-dangerous-patient/#post-16243 <![CDATA[Why Crown Down can be dangerous for the patient?]]> https://demo.discussdentistry.com/forums/topic/why-crown-down-can-be-dangerous-patient/#post-16243 Mon, 10 Dec 2012 13:05:22 +0000 drmithila Objective
The aim was to compare the force required to fracture uninstrumented and instrumented canines and to investigate the root-reinforcing capability of AH Plus sealer.

Study design
In groups 1-3 (n = 24) canals were instrumented with either GT files, FlexMaster, or stainless steel hand instruments. Twelve teeth from each group were obturated with lateral compaction using gutta-percha and AH Plus. Group 4 (n = 12) acted as uninstrumented controls. The force required to fracture the roots was measured. ANOVA, Scheffé, and t test were used for statistical analysis.

Results
The intact roots were significantly stronger than all groups with instrumented and unobturated roots (P < .05). Roots enlarged with GT files were significantly weaker (P < .05) than those instrumented with FlexMaster or hand instruments. Between the obturated and unobturated roots there were no significant differences (P > .05).

Conclusions
The roots were significantly weakened by the preparation with greater taper instruments. An obturation with AH Plus did not increase the fracture resistance.

        

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