의치상용 레진의 전입 방법에 따른 중합체적변화와 굴곡강도에 관한 연구
Dimensional change and flexural strength in complete dentures fabricated by injection molding and conventional compression processing
최훈달, 최대균, 김형섭, 권긍록,
소속 상세정보
최훈달 ( Choi Hoon-Dal ) - 경희대학교 치과대학 치과보철학교실
최대균 ( Choi Dae-Gyun ) - 경희대학교 치과대학 치과보철학교실
김형섭 ( Kim Hyeong-Seob ) - 경희대학교 치과대학 치과보철학교실
권긍록 ( Kwon Kung-Rock ) - 경희대학교 치과대학 치과보철학교실
KMID : 0362420050430040478
Abstract
Statement of problem: Fracture and dimensional change of an acrylic resin denture are a rather common occurrence.
Purpose: The purpose of this study was to compare differences in dimensional changes and flexural strength of separate maxillary complete dentures after immediate deflasking by injection molding and conventional compression processing.
Materials & Methods: To evaluate dimensional stability, the maxillary dentures were fabricated by using different materials and methods. Lucitone 199(Dentsply Trubyte, york, pennsylvania, USA) and Vertex(Dentimex, zeist, Netherlands) were used as materials. Compression and injection packing methods were used as processing methods. The impression surface of the dentures was measured by 3D Scann-ing System(PERCEPTRON, USA) and overlapped original impression surface of the master cast. To evaluate flexural strength, resin specimens were made according to the different materials, powder/liquid ratio and processing methods. Flexural strength of the complete resin specimens (64mm*10mm*3.3mm) were measured by INSTRON 467.(INSTRON, England) The data was analyzed by ANOVA, t-test and Tukey test.(p<.05 level of significance)
Results: The results were as follows: 1. There was no significant differences between master model and denture base for each group in overall dimensional changes. 2. Palatal area was more stable than flange or alveolar area in dimensional stability. but, there was no significant differences among each area. 3. Materials and power/liquid ratio had an effect on flexural strength.(p<.05) Especially materials was most effective.(p<.05) 4. Lucitone 199(powder/liquid ratio followed by manufacturer’s direction) showed higher flexural strength than Vertex.
Conclusion: Dimensional stability or flexural strength are affected by materials rather than packing techniques.
키워드
Dimensional stability;flexural strength;injection molding;conventional compression processing;complete denture
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