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下顎のショートインプラントにスプリントクラウンを装着した場合、装着後3年間の効果を評価する無作為化臨床試験
Randomized clinical trial evaluating the effect of splinting crowns on short implants in the mandible 3 years after loading.
PMID: 33463774 DOI: 10.1111/clr.13652.
抄録
目的:
下顎後部の短尺インプラントにスプリントを施したものと施さないものとで、荷重3年後のX線画像上の辺縁骨量と臨床パラメータを比較すること。
OBJECTIVE: To compare the radiographic marginal bone loss and clinical parameters of splinted and non-splinted fixed dental prostheses on short implants in the posterior region of the lower jaw 3 years after loading.
材料と方法:
本研究には,下顎に片側または両側のfree-end状況がある20名の患者(女性15名,男性5名)が参加した。下顎後面に2本の短尺インプラント(7mm)を埋入し、患者をスプリントクラウン(n=11)または非スプリントクラウン(n=13)に無作為に割り付けた。限界骨量(MBL)は、ベースライン時、装着後1年目、3年目にカスタマイズしたポジショニングジグで撮影したX線写真で評価した。また,Plaque Index(PI),Gingival Index(GI),Probing Depth(PD),Bbleeding on probing(BOP)を測定した.(ClinicalTrials.gov; 識別子: NCT03558347)。
MATERIAL AND METHODS: Twenty patients, 15 female and five males, with uni- or bilateral free-end situations in the mandible participated in the study. Two short implants (7 mm) in the posterior mandible were placed and patients were randomized to receive splinted (n = 11) or non-splinted (n = 13) cemented crowns. Marginal bone loss (MBL) was assessed on radiographs taken with customized positioning jigs at baseline, 1 and 3 years after loading. Plaque index (PI), gingival index (GI), probing depth (PD), and bleeding on probing (BOP) were measured. (ClinicalTrials.gov; identifier: NCT03558347).
結果:
RESULTS: After 3-year survival rate of altogether 48 implants was 100% for both groups. Success rate (according to Papaspyridakos, Chen, Singh, Weber, & Gallucci, 2012) was 84.6% for non-splinted and 86.4% for splinted implants. At restoration level survival rate was 100% for both groups. Marginal bone level changes showed mean gain of 0.3 ± 0.8 mm for non-splinted and 0.1 ± 0.5 mm for splinted implants 3 years after loading. Statistical analysis showed no significant difference in PI, GI, PD, BOP, and marginal bone loss between both groups (p > .05).
結論:
本研究の制限内で、短いインプラントにスプリントクラウンを装着しても、辺縁骨量やインプラント周囲の健康状態には影響しないと結論付けられた。
CONCLUSION: Within the limitations of this study it can be concluded that splinting crowns on short implants neither seems to affect the amount of marginal bone loss nor peri-implant health 3 years after loading.
© 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.