THE JOURNAL OF THE ACADEMY OF CLINICAL DENTISTRY

original article

Survey on base contour of mandible distal-extension partial denture

Fumiaki Yamazaki

Article type: original article
2013 Volume 33 Issue 3 Pages 195-201
Published: November 26, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.195

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According to the current denture education at dental universities, the base contour of mandible distal-extension partial denture is to be based on that of the complete denture―the buccal lines to extend beyond external oblique ridges, the posterior margin to cover the mesial half of the retro molar pads, and the lingual lines to exceed the mylohyoid lines. However, the dentures manufactured by many clinical dentists differ in their features from the education model. This paper is to report and discuss the results of questionnaire survey on dentures (200 cases) manufactured by clinicians. In order to better understand the dentures patients seek for, I conducted a survey on 200 mandible distal extension partial dentures from 24 dental offices. The findings of the survey are as follows; for 68％ of dentures their lingual lines were not exceeding mylohyoid lines; for 77％ of dentures their buccal lines were not extending to external oblique ridges; and for 81％ of dentures their posterior margins were not covering the mesial half of the retro molar pads. As such, mandible distal-extension partial dentures manufactured at clinics have deviated significantly in their base contours from the education model.

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clinical report

A Case of Comprehensive Dental Treatmenty

--Restorative-driven implant treatment using multiple bone augmentation Techniques

Chiyoko Ishibashi, Yoshiyuki Wada , Masami Kanda, Takeshi Kanbayashi, ...

Article type: clinical reports
2013 Volume 33 Issue 3 Pages 202-212
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.202

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Several bone augmentation techniques have been developed to enlarge implant recipient sites in the cases that the bone mass was insufficient for implant placement. They enable ideal implant placement and bring good esthetic outcomes. In the case of upper molar site, sinus floor augmentation used to achieve vertical bone height. However, this technique often brings high crown/root ratio, inacceptable esthetics and insufficient hygiene. Cortical bone block graft using autologous bone enable to acquire vertical bone volume toward the alveolar crest, and was reported to be able to increase bone in the severely resorbed posterior maxillary region. In this case, the cortical bone block graft with sponge bone from the mandibular posterior regions as a donor site and sinus floor elevation using osteotome technique were applied for atrophic posterior maxillary region for implant treatment. In addition, we achieved acceptable outcome by using the latest simulation soft for detailed planning and computer-guided surgery to reduce surgical stress.

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5 year follow-up after an immediate loading procedure in the edentulous mandible

Hitoshi Yoshinaga

Article type: clinical reports
2013 Volume 33 Issue 3 Pages 213-221
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.213

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Conventionally, postoperative management of edentulous patients can be troublesome in implant treatment. Postoperative complaints, such as eating disorders due to discontinued use of dentures, inadequate adaptation of the prostheses, and pain due to swelling of the mucosa, and occasional replacement and thickness control of tissue conditioners, among other issues, are fairly common in such patients. An edentulous patient, who had undergone strategic extraction of the periodontally involved teeth with poor prognosis, received implant treatment at our clinic. Full dentures were placed in the maxilla, and a gingival flap was reflected in the mandible for the immediate loading procedure. After the healing period with use of a provisional bridge, final prosthetic restoration was undertaken with a one-piece taperedtitanium base CAD/CAM implant bridge. The patient did not report any problems after 5 years. Therefore, the immediate loading concept was suggested to be a clinically useful method of treatment for edentulous patients.

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A case of upper and lower complete dentures with recognized appearance of mental foramen and divulsion part of mandibular canal associated with severe mandibular ridge resorption

Yasuhiro Shiraishi

Article type: clinical reports
2013 Volume 33 Issue 3 Pages 222-230
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.222

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It has been on the rise to address severe mandibular ridge resorption by using two implant overdenture in cases of patients with edentulous jaw since Macgill consensus． In particular, it is believed that use of implant may increase remarkably for patients with disorders falling under Level Ⅲ and Ⅳ of a case classification defined by Japan Prosthdontics Society． With a denture formation that just relies its support and retention on implant, however, poor prognosis has been observed in some cases． In addition, implant can’t be selected in many cases due to such reasons as systemic diseases associated with super-aged society． There is no choice for us but to rely on conventional complete denture to address such cases leaving indispensability of acquiring denture formation without implant．In a case of patient with exposure of mental foramen at the top of residual ridge associated with severe mandibular ridge resorption in addition to recognized appearance of divulsion part of mandibular canal, we were able to achieve support, retention,muscular retention and balance of occlusion of denture by re-constructing a functional occlusion system based on treatment dentures introducing the whole residual ridge mucosa as its support area, resulting in preferable result． Therefore, we report the case with upper and lower complete dentures．

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Function of Implant In Comprehensive Dentistry

—A case with an esthetic consideration for a patient with moderate chronic marginal periodontitis

Kenichi Tanaka

Article type: clinical reports
2013 Volume 33 Issue 3 Pages 231-241
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.231

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One of the most important factor in implant therapy when performed as one option of restorative treatment to reconstruct edentulous dentition is the placement position. Prosthetic driven implant is not always possible, but I am trying to consider based on both top-down and bottom-up concepts at the time of examination and diagnosis.We are willing to perform treatment just following the plan that is made before onset of the treatment. However, as the treatment scale gets larger, more the uncertain factors increase. So we have to deal with unexpected incident that requires higher level of clinical skill.When performing comprehensive treatment that requires restorative treatment for multiple teeth, accurate provisional restoration is crucial because it provide us information before making definitive restoration. Present report shows a case that was suffered with moderate to severe periodontitis and that was treated by comprehensive treatment accompanied with implant prosthesis on edentulous area.

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[title in Japanese]

taiji kato

2013 Volume 33 Issue 3 Pages 242-243
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.242

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[title in Japanese]

akihiro kuroiwa

2013 Volume 33 Issue 3 Pages 244-246
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.244

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[title in Japanese]

toyohiko hidaka

2013 Volume 33 Issue 3 Pages 247-253
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.247

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Concept of Therapeutic Mandibular Position and its Clinical Application （Part 1）

Sadao Sato, Satoshi Aoki

2013 Volume 33 Issue 3 Pages 254-262
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.254

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Where is the mandibular therapeutic position? In the case of unstable TMJ related to a craniomandibular dysfunction must be treated by the decision of the therapeutic condylar position. If we decide to change the condylar position, we could have as objectives to change the mandible forward （sagittal plane） and to look for physiological condylar position. The quantity of the anterior reposi tioning is depending of: condylo-discal-eminence relations and stability of condylar end position. A new ICP, in a protuded mandibular position, should be stabilized by occlusal support and retrusive guidance.

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[title in Japanese]

Norimasa Okafuji

2013 Volume 33 Issue 3 Pages 263-268
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.263

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[title in Japanese]

Esthetic restoration of the anterior teeth with rotation

Taiji Kato

2013 Volume 33 Issue 3 Pages 269-276
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.269

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For esthetics and for oral hygiene, correction of the rotated teeth is often required and an orthodontic treatment is considered the first choice. Although the necessity for orthodontic treat ment is widely recognized, it is not yet recognized the first choice in Japan.Orthodontic treatment is actually the best option in terms of minimal intervention, but most patients don't choose it be cause of age, esthetic reasons and so on. The second choice is a restorative treatment. Carving a tooth in a desirable shape seems to be the easiest way for restoration. However, with concern to damages and longevity of teeth, dental restoration should not be the second choice. Restoration using porcelain laminate veneer should be the next choice, since it meets an esthetic requirement as well as the need for minimal intervention. It requires a relatively small amount of drilling and offers longevity for its good adherence to the enamel surface. This article reports a successful case of esthetic restoration using porcelain laminate veneer under a compromise between the author and a patient.

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[title in Japanese]

Katsutoshi Matsumoto

2013 Volume 33 Issue 3 Pages 277-283
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.277

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[title in Japanese]

Toshihiro Imai

2013 Volume 33 Issue 3 Pages 283-293
Published: November 25, 2013
Released on J-STAGE: November 15, 2014

DOIhttps://doi.org/10.14399/jacd.33.283

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