Clinical evaluation of a dental color analysis system: The Crystaleye Spectrophotometer®

AbstractPurposeTo evaluate the clinical performance of the Crystaleye Spectrophotometer®, a dental color analysis system.MethodsThree color-measuring devices (Crystaleye Spectrophotometer®, CAS-ID1, MSC-2000) were tested and the differences in color measurements among them were evaluated using Scheffe's F-test. Color measurements with the Crystaleye Spectrophotometer® were repeated 10 times by the same operator. The color difference (ΔE) between the first and tenth measurements was calculated. The Crystaleye Spectrophotometer® was used to measure the color of the maxillary left central incisor under two conditions (light and dark) and the effect of exterior lighting was analyzed to assess the accuracy of measurements. Furthermore, five different operators performed color measurements, and ΔE among the three devices was calculated. The ΔE between the target tooth and the crown of a single maxillary central incisor crown fabricated using data from the Crystaleye Spectrophotmeter® was calculated. Color differences between prebleaching and postbleaching were also analyzed with the Crystaleye Spectrophotometer® using the parameters ΔE, ΔL*, Δa*, and Δb*.ResultsThe data from the three spectrophotometers were not significantly different. The ΔE during repeated color measurements by the same operator was 0.6. The ΔE between light and dark conditions was 0.9. The data from the five operators were not significantly different. The mean ΔE value between the target tooth and the fabricated crown was 1.2±0.4, and the mean ΔE value between prebleaching and postbleaching was 3.7±1.0.ConclusionsThe Crystaleye Spectrophotometer® is an easy-to-use color analysis system producing accurate color measurements under clinical conditions

歯根破折歯に対して抜歯後即時埋入インプラントを行った1症例

Immediate implant placement following extraction is suggested as a method of implant treatment. As this method is associated with almost no gingival recession or absorption of alveolar bone in the extraction socket, and as the period of treatment can be shortened, its usefulness has been widely reported. In this case, implant placement was performed immediately after extraction of an upper left first premolar in which a root fracture had been discovered, with porcelain fused to a metal crown used as the superstructure. Through implant placement immediately following extraction, postoperative gingival recession and bone absorption were kept to a minimum, and esthetic recovery was achieved. Moreover, the period of treatment up to functional recovery was shortened, showing that this can be an effective method of treatment in prosthetic dentistry when applied to suitable cases

口腔インプラント室における臨床統計観察

In November 1994, the Oral Implant Room was established as a clinic at the Dental Hospital of Iwate Medical University School of Dentistry. Since then, with the cooperation of the implant committee members recommended from each hospital department, we have performed treatment for the recovery of stomatognathic function. Therefore, with the goal of understanding the results of the Oral Implant Center, the clinical statistics of the treatment provided in the 14 years and 5 months between its opening and March 2009 were assembled, and the following results were obtained. 1. There were 148 cases of implantation involving 129 patients (54 men, 75 women). 2. Mean age at time of implantation was 50.6 years. Individuals in their 50s outnumbered those of other decades, and women outnumbered men. 3. A total of 513 implants were implanted (192 maxilla, 321 mandible), with an average of 3.5 implants per person. 4. The average time between primary surgery and secondary surgery was 5 months 24 days for the maxilla and 3 months 17 days for the mandible. 5. Regarding the distribution of implants, 52.6% were mandibular free-end and 29.3% were in the anterior maxilla. 6. Of the implant patients, 10.7% were smokers and 24.8% were drinkers. 7. The survival rate for the implants was 97.9%