BACKGROUND:With the consumption of acidic beverages, dental erosion becomes more serious. Erosion is related to direct loss of dental hard tissue, and causes dental over-abrasion, thus great threatening the dental health.
OBJECTIVE:To review the research work on the erosion of human teeth, erosion prevention, and teeth remineralization.
METHODS:A computer-based online retrieval of CNKI, Elsevier and Wiley databases between 1990 and 2013 was performed for articles abut human teeth erosion, erosion prevention and teeth remineralization. After repeated or old literatures were excluded, 58 literatures were included in the analysis.
RESULTS AND CONCLUSION:Current studies on dental erosion included three aspects, firstly, clinical observation of the symptoms and cause of dental erosion;secondly, the erosiveness of common acidic agents;and thirdly, the prevention of dental erosion. Many researchers focused on the prevention of dental erosion. It was suggested that dental erosion could be prevented through adjusting and control ing oral environment, enhancing the erosiveness of acidic beverages, and increasing the anti-erosion capacity of teeth. It should be noted that tooth erosion and friction/wear often occur simultaneously in the mouth. Therefore, future research should pay attention to the interaction mechanism of erosion, friction and wear of human teeth.

Objective:To compare the short and medium-term effects of arthroscopic surgery versus intra-articular injections for rotator cuff tears with concomitant shoulder stiffness in elderly patients.Methods:We performed a retrospectively study that included 116 patients with rotator cuff tears combined with shoulder stiffness between January 2015 and June 2017, with 56 patients receiving arthroscopic surgery (the surgery group)and 60 patients given intra-articular injections (the control group). The visual analogue scale (VAS)score, range of motion (ROM), American Shoulder and Elbow Surgeons (ASES)score, University of California Los Angeles (UCLA)score were recorded before treatment and 3, 6 and 12 months after treatment.Results:Compared with pre-treatment, VAS scores were lower and ROM, ASES and UCLA scores were higher in both groups after treatment ( P<0.05). At 3 months after treatment, VAS scores were higher and ASES and UCLA scores were lower in the surgery group than in the control group ( P<0.05), while there was no significant difference in ROM between the two groups ( P>0.05). At 6 and 12 months after treatment, VAS scores were lower, ROM was larger, and ASES and UCLA scores were higher in the surgery group than in the control group ( P<0.05). Conclusions:In patients with rotator cuff tears combined with shoulder stiffness, both arthroscopic surgery and intra-articular injections can alleviate pain and improve ROM and shoulder joint function.After 6 months of treatment, greater improvement is achieved in patients undergoing arthroscopic surgery than in patients receiving intra-articular injections.