[Evaluation of biologically oriented preparation technique and conventional dental preparation in total crown restoration].

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PURPOSE: To evaluate the value of biologically oriented preparation technique and conventional dental preparation in total crown restoration. METHODS: A total of 93 patients who underwent total crown restoration from January 2020 to November 2022 were selected, and were divided into experimental group and control group according to different dental preparation techniques. The control group was treated with conventional dental preparation (46 cases, 74 teeth), while the experimental group was treated with BOPT (47 cases, 75 teeth). Periodontal health indicators [plaque index (PI), gingival index (gingival index), probing depth (PD) and gingival thickness (GT)] were evaluated at 3 months, 6 months, 1 year and 2 years after treatment. The incidence of complications and patients' satisfaction were compared. RESULTS: In the control group, PI increased with time, reaching the highest value (2.20±0.57) at 1 year and decreasing to (1.70±0.66) at 2 years. PI of the experimental group reached the highest value (2.61±0.52) at the 3rd month, decreased at the 6th month, decreased to close to before treatment at the 1st year, and was significantly lower than before treatment at the 2nd year(P＜0.001). The GI of the two groups decreased with the extension of time, and the GI of the experimental group at 6 months, 1 year and 2 years after treatment was significantly lower than that of the control group (P＜0.001). The PD of the two groups decreased with the extension of time, and the PD of the control group increased at 6 months after treatment, and the PD of the experimental group was significantly lower than that of the control group at 6 months, 1 year and 2 years after treatment (P＜0.001). Buccal GT of the two groups decreased with the extension of time, and the GT of the experimental group at 6 months, 1 year and 2 years after treatment was significantly lower than that of the control group (P＜0.05). The incidence of biological complications in the experimental group (2.67%) was significantly lower than that in the control group (10.81%)(P＜0.05). There was no significant difference in the incidence of mechanical complications between the two groups (P＞0.05). The total complication rate of the experimental group (4.00%) was significantly lower than that of the control group (14.86%)(P＜0.05). The scores and total scores of satisfaction of the experimental group were significantly higher than those of the control group (P＜0.05). CONCLUSIONS: BOPT for total crown repair can reduce PI, GI and PD, increase GT, reduce complications and improve patients' satisfaction.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.