Tooth Mobility, Movement Following “High” Crowns Cementation – 3-year Results

Objective: The aim of this study was to monitor single crown restorations and the behaviour of the teeth involved over a four-month period in order to identify changes in tooth mobility and possible movement or repositioning of the teeth in the arch following cementation of the restorations. The patients were re-examined 3 years later to evaluate any further changes or symptoms caused by the restorations. Methods: Single tooth crowns, with and without intentional high occlusal vertical dimension, were cemented in 17 patients. Tooth mobility was recorded using the Periotest device and silicone impressions were obtained to record tooth position in the arch. Casts were analyzed using a surface contact scanner to produce 3D images. Recordings for tooth mobility and tooth movement were obtained immediately after cementation, one month and four months later as well as at the 3-year recall. Ethical approval and patient consent was obtained prior to the study. Results: 15 of the 17 patients reported mild discomfort the first 3-4 days which subsided within two weeks. No pain was reported. It was observed that tooth mobility increased only immediately following the cementation of the restorations, while normal values were recorded one month and four months later. Tooth movement occurred to teeth which had received high occlusion crowns. No lingering mobility or further movement of the teeth was observed 3 years later, including no resulting pathological symptoms such as necrosis of the pulp. Conclusions: Occlusal forces following the cementation of high crowns cause a transient and mild discomfort with no long-term effect on the mobility of posterior teeth. Tooth movement occurred between cementation and one month later.