Abstract
OBJECTIVES: To compare “hand fatigue” between use of a air-turbine and electric handpieces following preparation of a full coverage crown.
METHODS: Prosthodontic faculty (2) prepared extracted human teeth (mandibular 1st or 2nd molars) for full-coverage crowns using either a high-speed, air-turbine handpiece (Solara QT, StarDental), or an electric handpiece with a high speed attachment (200,000 rpm) (Bien Air). Similar new diamond burs were used (G6878K/FGSS016, Komet), for each preparation, without water spray. Extracted molars were embedded in a dentiform, placed in a patient simulator mannequin. Crown preparation time was limited to 15 minutes. Immediately prior to tooth preparation, each clinician was measured for finger pressure strength by using a custom-made, pencil-style grip and pressing a capacitive load-sensing button placed in a 3D printed instrument, similar in dimensions as a handpiece. Each operator was instructed to press as hard as they could for a period of at least 35 sec (S). The sensor output was directed to standalone data acquisition device (Arduino-based), and then to a personal computer. The sensor response was previously calibrated using standardized loads. Immediately following crown preparation, the clinicians were instructed to repeat the same finger pressure measurement. The difference in areas under the data collection time-load profiles prior to and subsequent to crown preparation was determined (measured in N*S (impact)), and compared statistically. (n=10 per condition).
RESULTS: 2-way ANOVA (pre-set alpha 0.05) indicated neither factor (Handpiece p=0.106; Operator p=0.078) nor the interaction term (p=0.821) significantly affected differences in pre-post preparation values. However, repeated measures, 2-way ANOVA comparing before/after values within each operator did indicate significantly less force development using the electric handpiece for one operator (p<0.001).
CONCLUSIONS: Use of an electric highspeed handpiece can result in significantly greater finger gripping force, but the effect is seen as being operator-dependent.
METHODS: Prosthodontic faculty (2) prepared extracted human teeth (mandibular 1st or 2nd molars) for full-coverage crowns using either a high-speed, air-turbine handpiece (Solara QT, StarDental), or an electric handpiece with a high speed attachment (200,000 rpm) (Bien Air). Similar new diamond burs were used (G6878K/FGSS016, Komet), for each preparation, without water spray. Extracted molars were embedded in a dentiform, placed in a patient simulator mannequin. Crown preparation time was limited to 15 minutes. Immediately prior to tooth preparation, each clinician was measured for finger pressure strength by using a custom-made, pencil-style grip and pressing a capacitive load-sensing button placed in a 3D printed instrument, similar in dimensions as a handpiece. Each operator was instructed to press as hard as they could for a period of at least 35 sec (S). The sensor output was directed to standalone data acquisition device (Arduino-based), and then to a personal computer. The sensor response was previously calibrated using standardized loads. Immediately following crown preparation, the clinicians were instructed to repeat the same finger pressure measurement. The difference in areas under the data collection time-load profiles prior to and subsequent to crown preparation was determined (measured in N*S (impact)), and compared statistically. (n=10 per condition).
RESULTS: 2-way ANOVA (pre-set alpha 0.05) indicated neither factor (Handpiece p=0.106; Operator p=0.078) nor the interaction term (p=0.821) significantly affected differences in pre-post preparation values. However, repeated measures, 2-way ANOVA comparing before/after values within each operator did indicate significantly less force development using the electric handpiece for one operator (p<0.001).
CONCLUSIONS: Use of an electric highspeed handpiece can result in significantly greater finger gripping force, but the effect is seen as being operator-dependent.
| Original language | English (US) |
|---|---|
| Article number | 1362 |
| Number of pages | 1 |
| Journal | Journal of Dental Research |
| Issue number | 99A |
| State | Published - Mar 18 2020 |
| Event | 98th Cession of the International Association of Dental Research - Washignton, DC, United States Duration: Mar 18 2020 → Mar 21 2020 Conference number: 98 |