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The final part of this literature review series presents guidelines for the optimal preparation of teeth to receive posts and cores.
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PURPOSE: Vibration from the high-speed handpiece may adversely affect the cement layer between a casting and a tooth, causing loss of retention or increased microleakage. This study assessed the effect of crown preparation on retention and microleakage of cemented cast post and cores. MATERIALS AND METHODS: Post and cores were fabricated for extracted teeth and cemented. Specimens were prepared for crown restorations, varying the preparation time and the rotary diamond instrument used. After thermocycling and immersion in a dye bath, tensile unseating force and linear dye penetration were measured. RESULTS: In general, retention decreased with increased severity of crown preparation; however, differences were not statistically significant (alpha = .05). Although the differing preparation conditions resulted in significant differences in microleakage, no consistent trends were evident. CONCLUSIONS: Crown preparation using high-speed rotary diamond abrasives of cast post and cores luted with zinc phosphate cement had no significant effect on their retention, but had varying effects on subsequent microleakage at the cement-tooth interface.
The belief that close adaptation of the metal margins to tooth surfaces in the undercut areas is the most important retentive feature, was borne out in this study. The type of preparation did not affect the retention of stainless steel crowns.
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A time-tested technique has been described for preparing teeth to receive a tissue tolerant casting. The technique uses a programmed, systematic approach with instruments that leave tooth surfaces smooth with no irregularities.
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The purpose of this study was to evaluate the effectiveness of a transcutaneous electrical nerve stimulation unit. The effects of electronic dental anesthesia and local anesthesia for deep cavity preparations in primary molars were compared in children aged 7 to 9 years by using the Eland Color Scale. The patients had symmetric teeth requiring Class I cavity preparation. One of the teeth was treated with electronic anesthesia and the other with local anesthesia. The tooth and method were selected randomly. Both restorations were finished at the same visit. There was no statistically significant difference between the groups in the perception of pain. Fifty-six percent of the children preferred transcutaneous electrical nerve stimulation, while 36% of them preferred local anesthesia.
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Dramatic progress over the past ten years in adhesive composite and glass ionomer materials has made possible innovative, minimal cavity designs. These designs, by conserving tooth tissue, maximize the strength of the remaining structure and facilitate the aesthetic preservation of the patient's own dentition. The author gives a critical review of some of the new techniques that have been proposed.
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Explore the source record for details and available documents.