ABSTRACT
The purpose of this in vitro study was to compare the effect of conventional handpiece and kinetic cavity preparation (KCP, air abrasion) techniques of cavity preparation on caries-like enamel lesion formation. After a fluoride-free prophylaxis, twelve human molars were examined macroscopically to ensure that buccal and lingual surfaces were caries-free. Unfilled cavities were prepared in mesiobuccal (conventional [CU]) and mesiolingual (air abrasion [AU]) enamel surfaces. Cavities were prepared in distobuccal (conventional [CF]) and distolingual (air abrasion [AF]) enamel surfaces and restored with composite resin following placement of a bonding agent. Acid-etching of cavity walls was performed only with the conventionally prepared cavities restored with resin. Air abrasion (KCP) prepared cavities were restored without acid-etching of the cavity walls. Teeth were thermocycled (500 cycles, 5 degrees to 50 degrees C, 500 cycles) and exposed to an artificial caries medium for caries initiation and progression. After caries formation, two longitudinal sections were taken from unfilled and filled cavity preparations and examined by polarized light microscopy for wall lesion presence and mean surface lesion depth. Surface lesion depths were similar among groups after the caries initiation period (CU = 225 microns; AU = 237 microns; CF = 241 microns; AF = 251 [p > .05, ANOVA, DMR]), and progression (CU = 437 microns; AU = 415 microns; CF = 405 microns; AF = 429 um [p > 0.05, ANOVA, DMR]). Extensive wall lesions were present in all CU and AU; while small wedge-shaped wall lesions were significantly (p < .05, ANOVA, DMR) fewer in CF (19 percent & 21 percent) and AF (17 percent & 21 percent) following caries initiation and progression compared with unfilled controls. Resin restorations placed in cavities prepared by air abrasion (KCP) and conventional handpiece techniques provided similar degrees of protection against a secondary caries-like challenge.
Subject(s)
Composite Resins , Dental Caries/etiology , Dental Cavity Preparation/methods , Dental Restoration, Permanent , Silicon Dioxide , Zirconium , Acid Etching, Dental , Analysis of Variance , Dental Caries/prevention & control , Dental Cavity Preparation/classification , Dental Cavity Preparation/instrumentation , Dental Enamel/ultrastructure , Dental High-Speed Equipment , Dentin-Bonding Agents , Disease Progression , Gels , Humans , Microscopy, Polarization , Molar , Recurrence , Resin Cements , Saliva, Artificial , Statistics as Topic , Surface Properties , ThermodynamicsABSTRACT
National Institute of Dental Research surveys indicate that the incidence of pit and fissure caries constitutes a higher proportion of the total caries incidence among U.S. teens and children than in the past. Air-abrasive technology may provide a more conservative alternative in the diagnosis and treatment of pit and fissure caries than traditional techniques using handpieces. The authors review characteristics of pit and fissure lesions and discuss methods for diagnosing and treating these lesions using air-abrasive technology.
Subject(s)
Dental Cavity Preparation/methods , Dental Fissures/diagnosis , Dental Fissures/therapy , Dental High-Speed Technique , Dental Restoration, Permanent/methods , Air Pressure , Aluminum Oxide , Child , Dental Cavity Preparation/instrumentation , Dental High-Speed Equipment/economics , HumansABSTRACT
Air-abrasive technology has re-emerged in dentistry. The history, characteristics and clinical applications of this approach are reviewed, including advantages and limitations for the removal of stain, enamel, dentin and decay. Air-abrasive technology may be especially suited for use in bonded restorations.
Subject(s)
Aluminum Oxide , Dental Cavity Preparation/methods , Air Pressure , HumansABSTRACT
A 25-year-old woman with gray striated staining on all teeth took minocycline for two years. Staining corresponded with the treatment time.
Subject(s)
Minocycline/adverse effects , Tooth Discoloration/chemically induced , Acne Vulgaris/drug therapy , Adult , Female , HumansABSTRACT
Pediatric dentistry offers many opportunities to employ lasers. Observations of laser uses with the primary dentition and evaluation of laser anesthesia for permanent premolars are presented in this preliminary report. Soft tissue surgery with children and adolescents is described. Dentin became desensitized with normal pulp test readings and histology when premolars were given laser exposure. Patient acceptance was high. Enamel conditioning for bonding, decay removal, root canal cleansing and exposing unerupted teeth are the most common procedures.
Subject(s)
Dental Cavity Preparation/methods , Laser Therapy , Surgery, Oral/instrumentation , Tooth, Deciduous/surgery , Anesthesia, Dental/methods , Child , Dental Bonding/methods , Humans , Orthodontic Appliances , Pulpectomy/methodsABSTRACT
Recently published bone fluoride values from Iowa are very high compared to earlier reports, suggesting an increase in fluoride intake. Reanalysis of the Iowa specimens shows levels one-fourth those reported by the Iowa laboratory indicating an error in the original report. Seventeen bone specimens, collected from long-term residents of Rochester, New York, drinking 1 ppm F- water, had a mean value of 2085 +/- 270 ppm F- on an ashed-weight basis. This value is not significantly different from that predicted by the data of Zipkin et al. in 1958. These data, therefore, do not support the contention that there has been an increase in fluoride intake.
