Pengaruh Strategi Scanning Berdasarkan Sequence dan Gerakan terhadap Akurasi Pencetakan dengan Intra Oral Scanner pada Klas III Kennedy

Abstract

Impression in Kennedy Class III cases for denture fabrication can be done with IOS. Kennedy's Class III is a condition of tooth loss located between the teeth (bounded saddle), of course this makes stabilization and retention of the denture easier to achieve because there are supporting teeth on both sides compared to Kennedy's Class I and II The accuracy of IOS impression in Klas III Kennedy cases is more accurate than Klas I and II, this causes frequent use of IOS in Klas III Kennedy cases so it needs to be studied further. The accuracy of impression is influenced by several external and internal factors. Scanning strategy is the main factor that affects the accuracy of impression with IOS. The scanning strategy is a sequence and movements when scanning to improve the accuracy of the virtual model. The sequence during scanning consists of Occlusal Lingual Buccal (OLB), Occlusal Buccal Lingual (OBL), Lingual Occlusal Buccal (LOB), and Buccal Occlusal Lingual (BOL). The movement during scanning consists of linear, zig zag, and S. The accuracy of the scanning strategy in IOS can be assessed based on trueness and precission. The use of comparative analysis with CloudCompare v2.13.0 software can be used to see the trueness and precission values. The purpose of this study is to see the effect of scanning strategies based on OLB and LOB sequences with zig zag and linear movements on the occlusal surface of the anterior region on the trueness and precission of IOS impression in Kennedy Clas III cases. One stone model with a Kennedy class III case was scanned with the Extra Oral Scanner (EOS) once as a reference sample to obtain the trueness value, and scanned with the IOS forty times divided into four groups as samples. Group A was scanning with OLB sequence with zig zag motion on the anterior surface ten times, Group B was scanning with OLB sequence with linear motion on the anterior surface 10 times, Group C was scanning with LOB sequence with zig zag motion on the anterior region surface 10 times, and Group D was scanning with LOB sequence with linear motion on the anterior region surface 10 times. The results showed that there was an effect of OLB and LOB sequence scanning strategies with zig zag and linear movements on the occlusal surface of the anterior region on trueness and precission. Based on the average value of trueness and precission, group C (sequence LOB with zig zag movement on the occlusal surface of the anterior region) has the highest value with the smallest discrepancy value, which is 28 ± 6.79 µm and 31 ± 6.37 µm. The results of this study indicate that the LOB sequence with zig zag motion on the occlusal surface of the anterior region provides the highest accuracy, both in terms of trueness and precission. Thus, this technique can be recommended to be applied in daily clinical practice, especially in digital impression of IOS in order to obtain more accurate impression and support denture making in Class III Kennedy cases with more precision.