Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] · 2026
The Impact of Covering Different Base Materials With CAD/CAM-Milled and 3D-Printed Inlays on the Fracture Resistance of Structurally Compromised Premolars.
СтатьяНазвание и аннотация: Перевод в очереди
Обработка статьи · этапы, ошибки и управление
Загрузка состояния…
Ошибки и ограничения
История · было → стало
Состояние обновляется каждые 5 секунд, пока блок открыт. Процент показывается только там, где известен объём работы. Пауза останавливает продолжение этапа; текущий запрос к источнику может завершиться.
Adel Rolla, Hamed Nahla, Kamel Mohamed Amr, Soliman Zainab
Аннотация
OBJECTIVES: This study aimed to evaluate the effect of different bulk-fill base materials and inlay fabrication techniques on the fracture resistance of structurally compromised premolars.
MATERIAL AND METHODS: Sixty intact premolars were randomly allocated to five groups (n = 12). Standardized slot-type mesio-occluso-distal cavities with undermined cusps were prepared in all groups except the intact control group. Teeth were restored with different base materials: flowable bulk-fill composite resin (BF-RBC) or short fiber-reinforced composite (SFRC) resin. Each group was further subdivided according to the fabrication technique of the CAD/CAM inlays (milled hybrid nano-ceramic composite or 3D-printed ceramic-filled hybrid composite resin). Fracture resistance was evaluated after thermocycling aging for 10,000 cycles, and the failure mode was inspected. Data were analyzed using heteroscedasticity-corrected two-way ANOVA with post hoc pairwise comparisons of the significant main effect (α = 0.05).
RESULTS: Fracture resistance was significantly influenced by inlay fabrication technique (p < 0.001) but not by base material or their interaction. In milled groups, SFRC exhibited a statistically more favorable failure mode than BF-RBC, whereas no significant differences were observed in 3D-printed groups.
CONCLUSIONS: CAD/CAM-milled restorations demonstrated superior fracture resistance compared with 3D-printed restorations in structurally compromised premolars.
CLINICAL SIGNIFICANCE: Selecting restorative materials with appropriate compliance is essential to accommodate tooth flexure and minimize fracture risk. CAD/CAM composite restorations provide a conservative approach for restoring structurally compromised premolars, and base material selection should be considered to enhance the stress distribution of the overlying inlay and support overall restoration longevity.
MATERIAL AND METHODS: Sixty intact premolars were randomly allocated to five groups (n = 12). Standardized slot-type mesio-occluso-distal cavities with undermined cusps were prepared in all groups except the intact control group. Teeth were restored with different base materials: flowable bulk-fill composite resin (BF-RBC) or short fiber-reinforced composite (SFRC) resin. Each group was further subdivided according to the fabrication technique of the CAD/CAM inlays (milled hybrid nano-ceramic composite or 3D-printed ceramic-filled hybrid composite resin). Fracture resistance was evaluated after thermocycling aging for 10,000 cycles, and the failure mode was inspected. Data were analyzed using heteroscedasticity-corrected two-way ANOVA with post hoc pairwise comparisons of the significant main effect (α = 0.05).
RESULTS: Fracture resistance was significantly influenced by inlay fabrication technique (p < 0.001) but not by base material or their interaction. In milled groups, SFRC exhibited a statistically more favorable failure mode than BF-RBC, whereas no significant differences were observed in 3D-printed groups.
CONCLUSIONS: CAD/CAM-milled restorations demonstrated superior fracture resistance compared with 3D-printed restorations in structurally compromised premolars.
CLINICAL SIGNIFICANCE: Selecting restorative materials with appropriate compliance is essential to accommodate tooth flexure and minimize fracture risk. CAD/CAM composite restorations provide a conservative approach for restoring structurally compromised premolars, and base material selection should be considered to enhance the stress distribution of the overlying inlay and support overall restoration longevity.