Ninety-five patients, aged between 16 and 70 years old, were included in this study. Patients were divided into two groups. Group one received Articaine 4% with 1:00.000 Adrenalines. Group two received Prilocaine with 3% Felypressin (0.03 I.U. per ml). Onset time of anaesthesia was objectively evaluated by using electronic pulp testing.

85 patients in this study had successful local anaesthetic followed by extraction within the study duration time (10 minutes). However, there were six patients with failure anaesthesia (5 in prilocaine group and 1 in articaine group). By application Person's Chi-square test (x2), there were no significant differences in the number of the episodes of the anaesthetic success between articaine and prilocaine groups at time intervals (P-value = 0.5). T- test showed there have been no important variations within the mean onset time of anaesthesia for articaine and prilocaine buccal infiltrations (P-value =0.1).

Inclusion Criteria:

• Patients have one or two upper teeth for extraction, subject tooth or its adjacent must be vital, healthy patient or patient with mild systemic diseases (class I or II according to American Society of Anesthesiology).

Exclusion Criteria:

• Patients excluded from this study if they have allergy to local anaesthetic agents or need surgical, or multiple teeth extraction.

it will be provided on demand