Overdenture Wearers Research Articles

The effect of controlled oral hygiene in overdenture wearers

The effect of controlled oral hygiene was studied in 40 patients treated with immediate complete overdentures in one or both jaws. Before prosthetic treatment conservative periodontal treatment was conducted with intensive instruction and motivation in oral hygiene care. Caries and periodontal status were recorded before and 2-4 weeks (day 0), 6 months, and 12 months after prosthetic treatment. However, the patients were seen more frequently for motivation and professional tooth cleaning. The material included 44 overdentures with a total of 92 abutments, with 1-4 abutments in each jaw. Before treatment the overall mean plaque index score was 1.43 +/- 0.68 and the overall mean gingival index score 1.57 +/- 0.53, and on day 0 and after 6 and 12 months the overall mean PlI score was 0.33-0.65 and the overall mean GI score 0.67-0.97. Adjacent to the abutments there was a significant reduction of the PlI and the GI scores from before treatment to day 0 and from day 0 to 6 months after prosthetic treatment (P less than 0.001). There was a significant reduction of pocket depth from day 0 to 6 months and from 6 to 12 months (P less than 0.01). The results of this study have shown that it is possible to maintain teeth as abutments for overdentures in patients with an initial poor dental status.

Some aspects of extracranial causes of facial pain

30. Pruzansky S, Pesek M, Osborn LF: Quantitative analysis of the Reprint requests to: electromyogram in masticating chewing gum of varying toughDR. CHARLES H. GIBBS ness. Am J Orthod 44~149, 1958 (Abstr). UNIVERSITY OF FLORIDA 31, Ahlgren J: Mechanism of mastication. Acta Odontol &and 24~1, COLLEGE OF DENTISTRY 1966 (Supple No. 44). Box J-424 32. Sposetti VJ, Gibbs CH, Alderson TH, Jaggers JH, Richmond GAINESVILLE, FL 32610 A, Conlon M, Nickerson D: Bite force and muscle activity in overdenture wearers before and after attachment placement. J

Bite force and muscle activity in overdenture wearers before and after attachment placement

Bite force and muscle activity in overdenture wearers before and after attachment placement

Ｆｕｌｌ ｏｖｅｒｄｅｎｔｕｒｅ装着者のそしゃく筋筋電図に関する研究 Ｉ 下がく両側犬歯歯根周囲麻酔下におけるｓｉｌｅｎｔ ｐｅｒｉｏｄの持続時間と発現ひん度について

Ｆｕｌｌ ｏｖｅｒｄｅｎｔｕｒｅ装着者のそしゃく筋筋電図に関する研究 Ｉ 下がく両側犬歯歯根周囲麻酔下におけるｓｉｌｅｎｔ ｐｅｒｉｏｄの持続時間と発現ひん度について

Ｆｕｌｌ ｏｖｅｒｄｅｎｔｕｒｅのそしゃく力およびそしゃく筋筋電図に関する研究 下がく両側犬歯および第１小きゅう歯を維持歯とした例について

For the preservation on the tissues and function of the patient body, the establishment of the suitable jaw registration and the denture use of long-term, the registration and the denture use of long-term, the overdenture is discovered new merits. The fundamental and clinical studies on this subject have been carried out much. Then, the studies on the masticatory forces and the electromyogram are not done at all except the works by K. Yamamoto and K. Shiiya. But, they do not make studies on the effect of the anchor teeth and the attachments on the masticatory function in the full overdenture wearers.Now, observing the effect of the bilateral mandibular canines and first premolars as the anchor teeth and the Bona ball anchorage 604 A as the attachments on the masticatory functions in full overdenture wearers, the author studies with the masticatory forces and the electromyogram at the same times.As the results of this studies, the author arrives at following conclusions:1. The masticatory forces are smallest on the ham. In foods, the largest masticatory forces are measured in 3 rd period and the smallest in 5 th. The antagonistic forces are smaller.2. According to the rhythm of masticatory forces and swallowing pattern, the duration (D) and the ratio of the duration to the term (D/T) are largest on the pickled radish. In foods, the largest rhythms are measured in 1st period and the smallest in 3 rd. Futher, the interval (I) and the term (T) are largest on the ham. In foods, the largest rhythms are measured in 5 th period and the smallest in 1st. The swallowing pattern is larger.3. As for the rhythm of electric discharge of masticatory muscles, the D, the T and the D/T are largest on ham, the I is largest on the pickled radish. In foods, the largest rhythms at the D and the D/T are in 1st period and smallest in 5 th. Though, the largest rhythms at the I and the T are in 5 th and smallest in 1st.4. The integrated amounts of masticatory forces are in 3 rd and the smallest in 5 th. The integrated amounts of antagonistic forces are larger.5. In terms of the integrated amount of muscular activity, the largest values are on the pickled radish. In foods, the largest values is in 3 rd and the smallest in 5 th. The swallowing is larger.6. The integrated amounts of muscular activity required per unit of the integrated amounts of the masticatory forces are largest on the pickled radish and peanut. In foods, it's values are larger in early period and smaller in medium.7. In numbers of masticatory stroke, the peanut are most.8. From these studies, it is given a saggestion that the full overdenture warers masticate more efficiently and harmoniously than the full overdenture wearbrs. It is clinically estimated that the increasing number of the anchor teeth and the form of attachment are the effective means for the improvement of masticatory function in full overdenture.

Ｆｕｌｌ ｏｖｅｒｄｅｎｔｕｒｅのそしゃく力，そしゃく力リズムおよびそしゃく力量に関する研究 下がく両側犬歯歯根周囲麻酔下における検討

Recently in dental treatment, various considerations apply the function of living tissue are exerted all possible efforts. Especially in prosthetic cases on remaining a few tooth without extraction, overdenture is reconsiderd new merits. It is supported that one of the advantage is the use of mechanoreceptor of periodontal ligament. Though, there is no reports that conclude it enough.Accordingly, observing the effect of the mechanoreceptor of periodontal ligament on the masticatory function in full overdenture used “O'ring” stud attachments on bilateral mandibular canines, the author studies on the masticatory force under anesthesia with “semi-conductor”. As the results of these studies, the author arrived at the following conclusions.1. The masticatory forces under anesthesia were larger than in normal, and there was a tendency that these increase from 1st masticatory period to 4th. The increasing rate was highest in the ham.2. The rhythm of masticatory forces under anesthesia were slower than in normal, and there was a tendency that these increase from 1st masticatory period to 4th. And yet in the ham, such tendency weakened rapidly.3. The integrated amounts of masticatory forces under anesthesia were smaller than in normal.From these studies, it was given a suggestion that under anesthesia the full overdenture wearers masticated more strongly than in normal. Though, the duration was short and the integrated amounts of masticatory forces were little. So, under anesthesia the full overdenture wearers did not masticate efficiently and rhythmically. It is inferred that such reason is the lack of information from the mechanoreceptor of periodontal ligament under anesthesia. Therefore it was estimated the use of remaining the roots in full overdenture.

The role in masseter muscle activities of functionally elicited periodontal afferents from abutment teeth under overdentures.

Five overdenture wearers with a small number of remaining natural teeth were selected to evaluate the effect of the afferent input from periodontal mechanoreceptors on masseter activity in man. As a control, a full denture wearer was included. The subjects were instructed to chew a piece of gum, and/or tap their teeth. Surface EmG from the bilateral masseter muscles were recorded and analysed. When functional pressure was applied, during chewing, to the abutment teeth as well as to mucosa through the denture base, masseter activities were encouraged. Following application of anaesthesia to the periodontal membrane of the abutments, masseter activities were reduced. The duration of the silent period (SP) appearing in the EMG burst following tooth tapping was significantly increased with root support compared to mucosal support only. With topical anaesthesia of the periodontal tissues, SP duration decreased significantly. In conclusion, it has become apparent that the pressure sensibility of abutment teeth bearing functional pressure under an overdenture base is capable of facilitating masseter activity, as one of the sources of oral sensory input during mastication.