Influence Of Abutment Position And Adhesive Point Dimension On Dental Trauma Wire-composite Splint Rigidity

Objective: The aim of this study was to evaluate the influence of abutmentposition and adhesive point dimension on the rigidity of wire-compositesplints in vitro, and to provide some theoretical basis for the choice of dentaltrauma splint in clinic.Materials and Methods: A commercial resin artificial model was used,where teeth11and21served as injured teeth (degrees of loosening II and III),wheras teeth12,22,13and23served as non-injured teeth (physiologicalmobility). Teeth were splinted with stainless steel wire-composite splint (0.8mm). Different abutment position (12,22and13,23) and three adhesivepoint dimension (2,3and4mm) was evaluated. Horizontal and vertical toothmobilities of each group were investigated5times before and after splintingwith universal testing machine. The tooh mobilities after splinting of eachgroup were compared with each other and compared with physiological mobility to evaluate the splint rigidity.Results:①No significant differences were found among tooth mobilitiesbefore splinting of each group (P>0.05).②Tooth mobilities after splinting ofeach group were significantly greater than physical tooth mobilities.③Significant differences were found in horizontal tooth mobilities of11aftersplinting between group3113(2×2) and2112(3×3), group3113(2×2) and2112(4×4), group2112(2×2) and2112(3×3), group2112(2×2) and2112(4×4),and horizontal tooth mobilities of21after spinting between group3113(2×2)and2112(3×3), group3113(2×2) and2112(4×4), group2112(2×2) and2112(4×4), and vertical tooth mobilities of11after splinting between group3113(2×2) and2112(4×4)(P<.05). No significant differences were found invertical tooth mobilities of21among each group(P>0.05). Significantdifferences were found in horizontal tooth mobilities of each group between11and21(P<.05). No Significant differences were found in vertical toothmobilities of each group between11and21(P<.05).Conclusion:①The simulated injured teeth and uninjured teeth were resetaccurately after the replacement of silicon rubber each time.②When the twoinjured teeth of degrees of loosening II and III and one bilateral abutmentuninjured tooth were fixed with stainless steel wire-composite splint (≤0.8mm), it can be regarded as flexible splinting.③Adhesive point dimension does not affect splint rigidity when it changes in a certain range.