Szentpétery Viola, Lautenschläger Christine, Setz Jürgen M
Department of Prosthodontics, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
Quintessence Int. 2010 Oct;41(9):749-58.
The longevity of frictional telescopic crowns (FTC) in severely reduced dentitions with 1 to 3 remaining teeth per jaw has not yet been studied prospectively and exclusively. Aims of this study were to estimate risks of telescope loss and abutment tooth loss and to determine abutment tooth mobility over time.
A total of 74 patients with severely reduced dentitions received 82 telescopic removable partial dentures (TRPDs) retained with 173 FTCs. Dentures were reexamined after 1 week and 3, 6, 12, 18, 24, 30, and 36 months. Tooth mobility was monitored with Periotest values. Adjuvant therapies were carried out if necessary. Survival probabilities of telescopes and abutment teeth as well as the influence of clinical factors (age, sex, jaw, vitality, opposing dentition, axis inclination, end Periotest value, crown length, crown margin quality, wearing mode, tooth types, abutment distribution, number of telescopes) were calculated with Kaplan-Meier estimators. The relative risks for telescope loss were calculated with Cox regression.
The survival rate was 93.9% for abutment teeth and 87.5% for telescopes. Number of telescopes, abutment distribution, vitality, and gender as factors influenced the survival rates (Kaplan-Meier). In combination with the jaw as a factor, these affected the risk for telescope loss (Cox regression). Periotest values (mean of abutment teeth per examination) decreased significantly (P < .0001). Altogether, 11% of teeth fractured and 4.6% of teeth were extracted. Patients were mostly very satisfied.
TRPDs proved to be a favorable treatment concept for severely reduced dentitions. FTCs can be considered as elements with a good benefit-maintenance relation. A general increase of abutment tooth mobility could not be verified.
对于每颌仅余留1至3颗牙齿的严重牙列缺损患者，尚未有前瞻性且专门针对摩擦式套筒冠（FTC）使用寿命的研究。本研究旨在评估套筒冠脱落和基牙缺失的风险，并确定基牙随时间推移的松动度。
共有74例严重牙列缺损患者接受了82副用173个FTC固位的套筒冠可摘局部义齿（TRPD）。在1周、3、6、12、18、24、30和36个月后对义齿进行复查。使用牙周探测值监测牙齿松动度。必要时进行辅助治疗。采用Kaplan-Meier估计量计算套筒冠和基牙的生存概率，以及临床因素（年龄、性别、颌位、牙髓活力、对颌牙列、牙轴倾斜度、最终牙周探测值、冠长、冠边缘质量、佩戴方式、牙齿类型、基牙分布、套筒冠数量）的影响。用Cox回归计算套筒冠脱落的相对风险。
基牙的生存率为93.9%，套筒冠的生存率为87.5%。套筒冠数量、基牙分布、牙髓活力和性别作为因素影响生存率（Kaplan-Meier法）。与颌位因素相结合，这些因素影响套筒冠脱落的风险（Cox回归）。牙周探测值（每次检查基牙的平均值）显著降低（P <.0001）。共有11%的牙齿发生折断，4.6%的牙齿被拔除。患者大多非常满意。
TRPD被证明是严重牙列缺损的一种良好治疗方案。FTC可被视为具有良好效益维持关系的元件。未证实基牙松动度普遍增加。
