Hydraulic and hydrophobic impressions.
نویسندگان
چکیده
One of the most frustrating aspects of making final impressions for crowns and bridges involves the management of finish lines that extend subgingivally. The dentist must contend with many problems like relapsing gingival tissue which can obstruct the flow of impression material into the sulcus. This is most often managed by packing retraction cord which is time-consuming, difficult and often uncomfortable for the patient. The dentist must also contend with gingival hemorrhaging which may fill the sulcus with blood and interfere with the flow of impression material. This is most often managed with hemostatic agents which may require multiple applications and taste bad. Moreover, hemorrhaging may recur spontaneously or when the cord is removed. And hemostatic agents which contain sulfur inhibit the setting of vinylpolysiloxane impression materials. Then there is the problem of saliva which may flood the field if the assistant fails to maintain adequate suction and isolation. With some patients this may be very difficult, if not impossible. All in all, making final impressions of subgingival finish lines can be a challenge, even under the best of circumstances. We have developed an impression technique that eliminates the need for retraction of the gingival tissue, application of hemostatic agents, or the need for maintaining a dry field. We will illustrate this technique with a simple example of making a final impression of a mandibular first molar crown preparation with deep subgingival margins.
منابع مشابه
Effect of Hydrophobic Surface on Velocity Profile of Pipe Flow
The branch of fluid mechanics is also familiar with biomechanics recently. The combination of hydrodynamic and mechanical specification of the flow can reach the complex description of the liquid flow in the hydraulic system. The hydraulic system can represent the airways and ventilation system, and external blood circulation. An important role in the study of hemo-transport has its interaction...
متن کاملEffect of Disinfection on the Surface Roughness of Dental Casts Retrieved from Addition Silicone Impressions
Background and aim: Changes in the physical properties of casts retrieved from disinfected impressions are a common problem in the fabrication of dental prostheses. However, there are limited data available about the effect of disinfecting solutions on the surface roughness of casts. This study aimed to assess the surface roughness of casts retrieved from addition silicone impressions disinfect...
متن کاملHardness and Surface Detail Reproduction of Gypsum Casts Retrieved from Addition Silicone Impressions Disinfected for Different Time Points
Background and Aim: Bacterial colonization occurs following contamination of impression materials with blood and saliva. However, not all disinfecting agents are compatible with the impression materials and may cause changes in the resultant casts. The purpose of this study was to assess the impact of various immersion time of addi-tion silicon impressions in different disinfecting solutions on...
متن کاملAn Investigation of Processes Linking Patient-Centered Communication Approaches to Favorable Impressions of Vietnamese Physicians and Hospital Services
Strong doctor-patient relationships generate greater patient satisfaction and compliance with physician recommendations. Although prior research has explored distinct factors driving favorable patient outcomes, investigations have yet to comprehensively address the efficacy of different communication styles. Furthermore, it is critical to explore the full impact communication approaches have on...
متن کاملKnowledge and Practice of Dentists Regarding Disinfection of Impressions Sent to Laboratory
Introdouction: Infection control procedures are essential fordentists. Oral and dental impressions can act as carriers of contaminants that can increase the risk of infections while being transferred from the laboratory to the dental office. Therefore, the aim of this study was to evaluate the knowledge and practice of dentists regarding disinfection of impressions sent to the laboratory. Mate...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Dentistry today
دوره 17 10 شماره
صفحات -
تاریخ انتشار 1998