研究目的
To evaluate the effect of Er:YAG laser as a non-invasive treatment modality to remove lithium disilicate crowns from zirconia implant abutments following long-term cementation, repetitive debonding and re-cementation, and short-term retrieval.
研究成果
Er:YAG laser can be used as a non-invasive tool to retrieve a lithium disilicate crown of a zirconia prefabricated abutment. Long-term cemented crown may be slightly more difficult to remove with Er:YAG laser than a crown with repeated cementation or new cementation. Er:YAG laser is a non-invasive tool to remove cement-retained implant prostheses and should be considered as a viable alternative to rotary instruments.
研究不足
1. Difficulty in accessing the implant abutment crown margin in patient’s mouth. 2. The thickness of the crown can vary and be more than 1–1.5 mm used in this study. 3. The cement used in this study may not be applicable to other cements. 4. Laser operator’s skills may affect the efficiency and thus the length of irradiation. 5. Clinical study in humans with varieties of abutment/crown materials, cements and prosthetic designs will be needed in the future.
1：Experimental Design and Method Selection:
The study involved the use of Er:YAG laser to remove lithium disilicate crowns from zirconia implant abutments under different cementation conditions.
2：Sample Selection and Data Sources:
Twenty identical lithium disilicate crowns were cemented onto zirconia prefabricated abutments using composite resin cement.
3：List of Experimental Equipment and Materials:
Er:YAG laser (LightWalker, Fotona, Slovenia), tipless handpiece (HO2, Fotona), intraoral scanner (Emerald, Planmeca), Planmeca Romexis software, lithium disilicate block (IPS e.max, Ivoclar Vivadent), composite resin cement (Variolink Esthetics, Ivoclar Vivadent).
4：Experimental Procedures and Operational Workflow:
The crowns were irradiated with Er:YAG laser at specific parameters, and the removal times were recorded. The surfaces of the crown and the abutment were examined using light microscopy and scanning electron microscopy (SEM). Temperature changes were also measured.
5：Data Analysis Methods:
The removal times were analyzed using ANOVA and t-test. Temperature changes were statistically analyzed using paired t-test.
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