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Title: An investigation of the local anaesthetic effect of a dental laser : a clinical and laboratory study
Author: Al-Bukhary, Rozana Abdullah Turdi
ISNI:       0000 0004 2720 1515
Awarding Body: University of Newcastle Upon Tyne
Current Institution: University of Newcastle upon Tyne
Date of Award: 2011
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Among current dental laser systems is the Er,Cr:YSGG laser which has been shown to be safe and effective for various oral soft and hard tissue procedures. Despite its clinical success and popularity, questions have been raised concerning its use to induce local anaesthesia; to date there is no scientific evidence that supports this claim. The purpose of this research was to investigate the local anaesthetic effect of an Er,Cr:YSGG laser when used for cavity preparation procedure. A particular focus was to determine the effectiveness of "pre-conditioning" - using the laser at a low output across the buccal and lingual surfaces for 60 seconds prior to cavity preparation. The work was carried out in three phases. -. " . : J',. Firstly, laboratory experiments were carried out to establish a protocol that enabled teeth to be pre-conditioned without causing side effects in terms of surface damage and unacceptable temperature rise within the tooth pulp chamber. The laboratory experiments also included the development of a standardised cold test to be used in the main clinical study. Secondly, the effects of pre-conditioning on volunteers were tested using the electronic pulp tester as the main outcome measure. The final phase was the main clinical study involving cavity preparation without local anaesthesia in patients requiring orthodontic extractions of paired upper premolars. Teeth were randomly allocated to pre-conditioning or no pre-conditioning. Subjective and objective measures were employed to determine the level of anaesthesia. The operator's own experience with the laser was also reported. The micro morphological picture of laser irradiated teeth conducted uniquely in vivo was assessed usmg scanning electron and light microscopy. The results of this study suggest that the Er,Cr:YSGG did not induce local anaesthesia in sound teeth of young adult patients. The micro morphological picture of the cavity preparations was similar to those reported from in vitro studies.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available